[PATCH v7 0/3] Add %p4cc printk modifier for V4L2 and DRM fourcc codes

[PATCH v7 0/3] Add %p4cc printk modifier for V4L2 and DRM fourcc codes

[Sakari Ailus]

Hi all,

This set adds support for %p4cc printk modifier for printing V4L2 and DRM
fourcc codes. The codes are cumbersome to print manually and by adding the
modifier, this task is saved from the V4L2 and DRM frameworks as well as
related drivers. DRM actually had it handled in a way (see 3rd patch) but
the printk modifier makes printing the format easier even there. On V4L2
side it saves quite a few lines of repeating different implementations of
printing the 4cc codes.

Further work will include converting the V4L2 drivers doing the same, as
well as converting DRM drivers from drm_get_format_name() to plain %p4cc.
I left these out from this version since individual drivers are easier
changed without dealing with multiple trees.

If DRM folks would prefer to convert drivers to %p4cc directly instead I
have no problem dropping the 3rd patch. Nearly all uses in DRM are in
printk family of functions that can readily use %p4cc instead of the
current arrangement that relies on caller-allocated temporary buffer.

Since v6:

- Don't drop spaces in fourcc codes.

- Print unprintable characters as dot ('.') instead of hexadecimal number
  in parentheses.

- Convert DRM from drm_get_format_name() to %p4cc. I wonder if this should
  be merged through the DRM tree, albeit it's probably unlikely to
  conflict with other changes. Further use of the function could be a
  problem.

- Make tests more realistic.

Since v5:

- Added V4L2 core conversion to %p4cc, as well as change the DRM
  fourcc printing function to use %p4cc.

- Add missing checkpatch.pl checks for %p4cc modifier.

Sakari Ailus (3):
  lib/vsprintf: Add support for printing V4L2 and DRM fourccs
  v4l: ioctl: Use %p4cc printk modifier to print FourCC codes
  drm: Switch to %p4cc format modifier

 Documentation/core-api/printk-formats.rst     | 16 ++++
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 +-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 +-
 .../arm/display/komeda/komeda_format_caps.h   | 11 ---
 .../arm/display/komeda/komeda_framebuffer.c   |  4 +-
 .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 +-
 drivers/gpu/drm/arm/malidp_mw.c               |  7 +-
 drivers/gpu/drm/drm_atomic.c                  |  8 +-
 drivers/gpu/drm/drm_crtc.c                    |  7 +-
 drivers/gpu/drm/drm_fourcc.c                  | 25 ------
 drivers/gpu/drm/drm_framebuffer.c             | 11 +--
 drivers/gpu/drm/drm_mipi_dbi.c                |  5 +-
 drivers/gpu/drm/drm_plane.c                   |  8 +-
 .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 +-
 drivers/gpu/drm/i915/display/intel_display.c  | 14 +--
 .../drm/i915/display/intel_display_debugfs.c  | 19 ++---
 drivers/gpu/drm/i915/display/intel_sprite.c   |  6 +-
 drivers/gpu/drm/mcde/mcde_display.c           |  6 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 +-
 drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +-
 drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +--
 drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 +-
 drivers/gpu/drm/vkms/vkms_writeback.c         |  7 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 ++--
 drivers/media/v4l2-core/v4l2-ioctl.c          | 85 +++++--------------
 include/drm/drm_fourcc.h                      |  1 -
 lib/test_printf.c                             | 17 ++++
 lib/vsprintf.c                                | 39 +++++++++
 scripts/checkpatch.pl                         |  6 +-
 32 files changed, 161 insertions(+), 223 deletions(-)

-- 
2.29.2

[PATCH v7 0/3] Add %p4cc printk modifier for V4L2 and DRM fourcc codes

[Sakari Ailus]

Hi all,

This set adds support for %p4cc printk modifier for printing V4L2 and DRM
fourcc codes. The codes are cumbersome to print manually and by adding the
modifier, this task is saved from the V4L2 and DRM frameworks as well as
related drivers. DRM actually had it handled in a way (see 3rd patch) but
the printk modifier makes printing the format easier even there. On V4L2
side it saves quite a few lines of repeating different implementations of
printing the 4cc codes.

Further work will include converting the V4L2 drivers doing the same, as
well as converting DRM drivers from drm_get_format_name() to plain %p4cc.
I left these out from this version since individual drivers are easier
changed without dealing with multiple trees.

If DRM folks would prefer to convert drivers to %p4cc directly instead I
have no problem dropping the 3rd patch. Nearly all uses in DRM are in
printk family of functions that can readily use %p4cc instead of the
current arrangement that relies on caller-allocated temporary buffer.

Since v6:

- Don't drop spaces in fourcc codes.

- Print unprintable characters as dot ('.') instead of hexadecimal number
  in parentheses.

- Convert DRM from drm_get_format_name() to %p4cc. I wonder if this should
  be merged through the DRM tree, albeit it's probably unlikely to
  conflict with other changes. Further use of the function could be a
  problem.

- Make tests more realistic.

Since v5:

- Added V4L2 core conversion to %p4cc, as well as change the DRM
  fourcc printing function to use %p4cc.

- Add missing checkpatch.pl checks for %p4cc modifier.

Sakari Ailus (3):
  lib/vsprintf: Add support for printing V4L2 and DRM fourccs
  v4l: ioctl: Use %p4cc printk modifier to print FourCC codes
  drm: Switch to %p4cc format modifier

 Documentation/core-api/printk-formats.rst     | 16 ++++
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 +-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 +-
 .../arm/display/komeda/komeda_format_caps.h   | 11 ---
 .../arm/display/komeda/komeda_framebuffer.c   |  4 +-
 .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 +-
 drivers/gpu/drm/arm/malidp_mw.c               |  7 +-
 drivers/gpu/drm/drm_atomic.c                  |  8 +-
 drivers/gpu/drm/drm_crtc.c                    |  7 +-
 drivers/gpu/drm/drm_fourcc.c                  | 25 ------
 drivers/gpu/drm/drm_framebuffer.c             | 11 +--
 drivers/gpu/drm/drm_mipi_dbi.c                |  5 +-
 drivers/gpu/drm/drm_plane.c                   |  8 +-
 .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 +-
 drivers/gpu/drm/i915/display/intel_display.c  | 14 +--
 .../drm/i915/display/intel_display_debugfs.c  | 19 ++---
 drivers/gpu/drm/i915/display/intel_sprite.c   |  6 +-
 drivers/gpu/drm/mcde/mcde_display.c           |  6 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 +-
 drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +-
 drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +--
 drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 +-
 drivers/gpu/drm/vkms/vkms_writeback.c         |  7 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 ++--
 drivers/media/v4l2-core/v4l2-ioctl.c          | 85 +++++--------------
 include/drm/drm_fourcc.h                      |  1 -
 lib/test_printf.c                             | 17 ++++
 lib/vsprintf.c                                | 39 +++++++++
 scripts/checkpatch.pl                         |  6 +-
 32 files changed, 161 insertions(+), 223 deletions(-)

-- 
2.29.2
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[PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Sakari Ailus]

Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
pixel formats denoted by fourccs. The fourcc encoding is the same for both
so the same implementation can be used.

Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
 Documentation/core-api/printk-formats.rst | 16 ++++++++++
 lib/test_printf.c                         | 17 ++++++++++
 lib/vsprintf.c                            | 39 +++++++++++++++++++++++
 scripts/checkpatch.pl                     |  6 ++--
 4 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 160e710d992f..da2aa065dc42 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -567,6 +567,22 @@ For printing netdev_features_t.
 
 Passed by reference.
 
+V4L2 and DRM FourCC code (pixel format)
+---------------------------------------
+
+::
+
+	%p4cc
+
+Print a FourCC code used by V4L2 or DRM, including format endianness and
+its numerical value as hexadecimal.
+
+Passed by reference.
+
+Examples::
+
+	%p4cc	BG12 little-endian (0x32314742)
+
 Thanks
 ======
 
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 7d60f24240a4..9848510a2786 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -647,6 +647,22 @@ static void __init fwnode_pointer(void)
 	software_node_unregister_nodes(softnodes);
 }
 
+static void __init fourcc_pointer(void)
+{
+	struct {
+		u32 code;
+		char *str;
+	} const try[] = {
+		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
+		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
+		{ 0x10111213, ".... little-endian (0x10111213)", },
+	};
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(try); i++)
+		test(try[i].str, "%p4cc", &try[i].code);
+}
+
 static void __init
 errptr(void)
 {
@@ -692,6 +708,7 @@ test_pointer(void)
 	flags();
 	errptr();
 	fwnode_pointer();
+	fourcc_pointer();
 }
 
 static void __init selftest(void)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 3b53c73580c5..432b5a2d1e90 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr,
 	return special_hex_number(buf, end, num, size);
 }
 
+static noinline_for_stack
+char *fourcc_string(char *buf, char *end, const u32 *fourcc,
+		    struct printf_spec spec, const char *fmt)
+{
+	char output[sizeof("1234 little-endian (0x01234567)")];
+	char *p = output;
+	unsigned int i;
+	u32 val;
+
+	if (fmt[1] != 'c' || fmt[2] != 'c')
+		return error_string(buf, end, "(%p4?)", spec);
+
+	if (check_pointer(&buf, end, fourcc, spec))
+		return buf;
+
+	val = *fourcc & ~BIT(31);
+
+	for (i = 0; i < sizeof(*fourcc); i++) {
+		unsigned char c = val >> (i * 8);
+
+		/* Print non-control ASCII characters as-is, dot otherwise */
+		*p++ = isascii(c) && isprint(c) ? c : '.';
+	}
+
+	strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian");
+	p += strlen(p);
+
+	*p++ = ' ';
+	*p++ = '(';
+	p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32));
+	*p++ = ')';
+	*p = '\0';
+
+	return string(buf, end, output, spec);
+}
+
 static noinline_for_stack
 char *address_val(char *buf, char *end, const void *addr,
 		  struct printf_spec spec, const char *fmt)
@@ -2162,6 +2198,7 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
  *       correctness of the format string and va_list arguments.
  * - 'K' For a kernel pointer that should be hidden from unprivileged users
  * - 'NF' For a netdev_features_t
+ * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
  * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
  *            a certain separator (' ' by default):
  *              C colon
@@ -2259,6 +2296,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 		return restricted_pointer(buf, end, ptr, spec);
 	case 'N':
 		return netdev_bits(buf, end, ptr, spec, fmt);
+	case '4':
+		return fourcc_string(buf, end, ptr, spec, fmt);
 	case 'a':
 		return address_val(buf, end, ptr, spec, fmt);
 	case 'd':
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 92e888ed939f..79858e07d023 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6557,9 +6557,11 @@ sub process {
 					$specifier = $1;
 					$extension = $2;
 					$qualifier = $3;
-					if ($extension !~ /[SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
+					if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
 					    ($extension eq "f" &&
-					     defined $qualifier && $qualifier !~ /^w/)) {
+					     defined $qualifier && $qualifier !~ /^w/) ||
+					    ($extension eq "4" &&
+					     defined $qualifier && $qualifier !~ /^cc/)) {
 						$bad_specifier = $specifier;
 						last;
 					}
-- 
2.29.2

[PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Sakari Ailus]

Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
pixel formats denoted by fourccs. The fourcc encoding is the same for both
so the same implementation can be used.

Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
 Documentation/core-api/printk-formats.rst | 16 ++++++++++
 lib/test_printf.c                         | 17 ++++++++++
 lib/vsprintf.c                            | 39 +++++++++++++++++++++++
 scripts/checkpatch.pl                     |  6 ++--
 4 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 160e710d992f..da2aa065dc42 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -567,6 +567,22 @@ For printing netdev_features_t.
 
 Passed by reference.
 
+V4L2 and DRM FourCC code (pixel format)
+---------------------------------------
+
+::
+
+	%p4cc
+
+Print a FourCC code used by V4L2 or DRM, including format endianness and
+its numerical value as hexadecimal.
+
+Passed by reference.
+
+Examples::
+
+	%p4cc	BG12 little-endian (0x32314742)
+
 Thanks
 ======
 
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 7d60f24240a4..9848510a2786 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -647,6 +647,22 @@ static void __init fwnode_pointer(void)
 	software_node_unregister_nodes(softnodes);
 }
 
+static void __init fourcc_pointer(void)
+{
+	struct {
+		u32 code;
+		char *str;
+	} const try[] = {
+		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
+		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
+		{ 0x10111213, ".... little-endian (0x10111213)", },
+	};
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(try); i++)
+		test(try[i].str, "%p4cc", &try[i].code);
+}
+
 static void __init
 errptr(void)
 {
@@ -692,6 +708,7 @@ test_pointer(void)
 	flags();
 	errptr();
 	fwnode_pointer();
+	fourcc_pointer();
 }
 
 static void __init selftest(void)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 3b53c73580c5..432b5a2d1e90 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr,
 	return special_hex_number(buf, end, num, size);
 }
 
+static noinline_for_stack
+char *fourcc_string(char *buf, char *end, const u32 *fourcc,
+		    struct printf_spec spec, const char *fmt)
+{
+	char output[sizeof("1234 little-endian (0x01234567)")];
+	char *p = output;
+	unsigned int i;
+	u32 val;
+
+	if (fmt[1] != 'c' || fmt[2] != 'c')
+		return error_string(buf, end, "(%p4?)", spec);
+
+	if (check_pointer(&buf, end, fourcc, spec))
+		return buf;
+
+	val = *fourcc & ~BIT(31);
+
+	for (i = 0; i < sizeof(*fourcc); i++) {
+		unsigned char c = val >> (i * 8);
+
+		/* Print non-control ASCII characters as-is, dot otherwise */
+		*p++ = isascii(c) && isprint(c) ? c : '.';
+	}
+
+	strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian");
+	p += strlen(p);
+
+	*p++ = ' ';
+	*p++ = '(';
+	p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32));
+	*p++ = ')';
+	*p = '\0';
+
+	return string(buf, end, output, spec);
+}
+
 static noinline_for_stack
 char *address_val(char *buf, char *end, const void *addr,
 		  struct printf_spec spec, const char *fmt)
@@ -2162,6 +2198,7 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
  *       correctness of the format string and va_list arguments.
  * - 'K' For a kernel pointer that should be hidden from unprivileged users
  * - 'NF' For a netdev_features_t
+ * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
  * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
  *            a certain separator (' ' by default):
  *              C colon
@@ -2259,6 +2296,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 		return restricted_pointer(buf, end, ptr, spec);
 	case 'N':
 		return netdev_bits(buf, end, ptr, spec, fmt);
+	case '4':
+		return fourcc_string(buf, end, ptr, spec, fmt);
 	case 'a':
 		return address_val(buf, end, ptr, spec, fmt);
 	case 'd':
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 92e888ed939f..79858e07d023 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6557,9 +6557,11 @@ sub process {
 					$specifier = $1;
 					$extension = $2;
 					$qualifier = $3;
-					if ($extension !~ /[SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
+					if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
 					    ($extension eq "f" &&
-					     defined $qualifier && $qualifier !~ /^w/)) {
+					     defined $qualifier && $qualifier !~ /^w/) ||
+					    ($extension eq "4" &&
+					     defined $qualifier && $qualifier !~ /^cc/)) {
 						$bad_specifier = $specifier;
 						last;
 					}
-- 
2.29.2

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Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> pixel formats denoted by fourccs. The fourcc encoding is the same for both
> so the same implementation can be used.

This version I almost like, feel free to add
Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
after considering addressing below nit-picks.

> Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> ---
>  Documentation/core-api/printk-formats.rst | 16 ++++++++++
>  lib/test_printf.c                         | 17 ++++++++++
>  lib/vsprintf.c                            | 39 +++++++++++++++++++++++
>  scripts/checkpatch.pl                     |  6 ++--
>  4 files changed, 76 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
> index 160e710d992f..da2aa065dc42 100644
> --- a/Documentation/core-api/printk-formats.rst
> +++ b/Documentation/core-api/printk-formats.rst
> @@ -567,6 +567,22 @@ For printing netdev_features_t.
>  
>  Passed by reference.
>  
> +V4L2 and DRM FourCC code (pixel format)
> +---------------------------------------
> +
> +::
> +
> +	%p4cc
> +
> +Print a FourCC code used by V4L2 or DRM, including format endianness and
> +its numerical value as hexadecimal.
> +
> +Passed by reference.
> +
> +Examples::
> +
> +	%p4cc	BG12 little-endian (0x32314742)

No examples with spaces / non-printable / non-ascii characters

> +
>  Thanks
>  ======
>  
> diff --git a/lib/test_printf.c b/lib/test_printf.c
> index 7d60f24240a4..9848510a2786 100644
> --- a/lib/test_printf.c
> +++ b/lib/test_printf.c
> @@ -647,6 +647,22 @@ static void __init fwnode_pointer(void)
>  	software_node_unregister_nodes(softnodes);
>  }
>  
> +static void __init fourcc_pointer(void)
> +{
> +	struct {
> +		u32 code;
> +		char *str;
> +	} const try[] = {
> +		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
> +		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
> +		{ 0x10111213, ".... little-endian (0x10111213)", },
> +	};
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(try); i++)
> +		test(try[i].str, "%p4cc", &try[i].code);
> +}
> +
>  static void __init
>  errptr(void)
>  {
> @@ -692,6 +708,7 @@ test_pointer(void)
>  	flags();
>  	errptr();
>  	fwnode_pointer();
> +	fourcc_pointer();
>  }
>  
>  static void __init selftest(void)
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 3b53c73580c5..432b5a2d1e90 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr,
>  	return special_hex_number(buf, end, num, size);
>  }
>  
> +static noinline_for_stack
> +char *fourcc_string(char *buf, char *end, const u32 *fourcc,
> +		    struct printf_spec spec, const char *fmt)
> +{
> +	char output[sizeof("1234 little-endian (0x01234567)")];

1234 -> ABCD ? (Or XY12 to be closer to the reality)

> +	char *p = output;
> +	unsigned int i;
> +	u32 val;
> +
> +	if (fmt[1] != 'c' || fmt[2] != 'c')
> +		return error_string(buf, end, "(%p4?)", spec);
> +
> +	if (check_pointer(&buf, end, fourcc, spec))
> +		return buf;
> +
> +	val = *fourcc & ~BIT(31);
> +
> +	for (i = 0; i < sizeof(*fourcc); i++) {
> +		unsigned char c = val >> (i * 8);
> +
> +		/* Print non-control ASCII characters as-is, dot otherwise */
> +		*p++ = isascii(c) && isprint(c) ? c : '.';
> +	}
> +
> +	strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian");
> +	p += strlen(p);
> +
> +	*p++ = ' ';
> +	*p++ = '(';
> +	p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32));
> +	*p++ = ')';
> +	*p = '\0';
> +
> +	return string(buf, end, output, spec);
> +}
> +
>  static noinline_for_stack
>  char *address_val(char *buf, char *end, const void *addr,
>  		  struct printf_spec spec, const char *fmt)
> @@ -2162,6 +2198,7 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
>   *       correctness of the format string and va_list arguments.
>   * - 'K' For a kernel pointer that should be hidden from unprivileged users
>   * - 'NF' For a netdev_features_t
> + * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
>   * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
>   *            a certain separator (' ' by default):
>   *              C colon
> @@ -2259,6 +2296,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  		return restricted_pointer(buf, end, ptr, spec);
>  	case 'N':
>  		return netdev_bits(buf, end, ptr, spec, fmt);
> +	case '4':
> +		return fourcc_string(buf, end, ptr, spec, fmt);
>  	case 'a':
>  		return address_val(buf, end, ptr, spec, fmt);
>  	case 'd':
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 92e888ed939f..79858e07d023 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -6557,9 +6557,11 @@ sub process {
>  					$specifier = $1;
>  					$extension = $2;
>  					$qualifier = $3;
> -					if ($extension !~ /[SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
> +					if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
>  					    ($extension eq "f" &&
> -					     defined $qualifier && $qualifier !~ /^w/)) {
> +					     defined $qualifier && $qualifier !~ /^w/) ||
> +					    ($extension eq "4" &&
> +					     defined $qualifier && $qualifier !~ /^cc/)) {
>  						$bad_specifier = $specifier;
>  						last;
>  					}
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> pixel formats denoted by fourccs. The fourcc encoding is the same for both
> so the same implementation can be used.

This version I almost like, feel free to add
Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
after considering addressing below nit-picks.

> Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> ---
>  Documentation/core-api/printk-formats.rst | 16 ++++++++++
>  lib/test_printf.c                         | 17 ++++++++++
>  lib/vsprintf.c                            | 39 +++++++++++++++++++++++
>  scripts/checkpatch.pl                     |  6 ++--
>  4 files changed, 76 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
> index 160e710d992f..da2aa065dc42 100644
> --- a/Documentation/core-api/printk-formats.rst
> +++ b/Documentation/core-api/printk-formats.rst
> @@ -567,6 +567,22 @@ For printing netdev_features_t.
>  
>  Passed by reference.
>  
> +V4L2 and DRM FourCC code (pixel format)
> +---------------------------------------
> +
> +::
> +
> +	%p4cc
> +
> +Print a FourCC code used by V4L2 or DRM, including format endianness and
> +its numerical value as hexadecimal.
> +
> +Passed by reference.
> +
> +Examples::
> +
> +	%p4cc	BG12 little-endian (0x32314742)

No examples with spaces / non-printable / non-ascii characters

> +
>  Thanks
>  ======
>  
> diff --git a/lib/test_printf.c b/lib/test_printf.c
> index 7d60f24240a4..9848510a2786 100644
> --- a/lib/test_printf.c
> +++ b/lib/test_printf.c
> @@ -647,6 +647,22 @@ static void __init fwnode_pointer(void)
>  	software_node_unregister_nodes(softnodes);
>  }
>  
> +static void __init fourcc_pointer(void)
> +{
> +	struct {
> +		u32 code;
> +		char *str;
> +	} const try[] = {
> +		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
> +		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
> +		{ 0x10111213, ".... little-endian (0x10111213)", },
> +	};
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(try); i++)
> +		test(try[i].str, "%p4cc", &try[i].code);
> +}
> +
>  static void __init
>  errptr(void)
>  {
> @@ -692,6 +708,7 @@ test_pointer(void)
>  	flags();
>  	errptr();
>  	fwnode_pointer();
> +	fourcc_pointer();
>  }
>  
>  static void __init selftest(void)
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 3b53c73580c5..432b5a2d1e90 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr,
>  	return special_hex_number(buf, end, num, size);
>  }
>  
> +static noinline_for_stack
> +char *fourcc_string(char *buf, char *end, const u32 *fourcc,
> +		    struct printf_spec spec, const char *fmt)
> +{
> +	char output[sizeof("1234 little-endian (0x01234567)")];

1234 -> ABCD ? (Or XY12 to be closer to the reality)

> +	char *p = output;
> +	unsigned int i;
> +	u32 val;
> +
> +	if (fmt[1] != 'c' || fmt[2] != 'c')
> +		return error_string(buf, end, "(%p4?)", spec);
> +
> +	if (check_pointer(&buf, end, fourcc, spec))
> +		return buf;
> +
> +	val = *fourcc & ~BIT(31);
> +
> +	for (i = 0; i < sizeof(*fourcc); i++) {
> +		unsigned char c = val >> (i * 8);
> +
> +		/* Print non-control ASCII characters as-is, dot otherwise */
> +		*p++ = isascii(c) && isprint(c) ? c : '.';
> +	}
> +
> +	strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian");
> +	p += strlen(p);
> +
> +	*p++ = ' ';
> +	*p++ = '(';
> +	p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32));
> +	*p++ = ')';
> +	*p = '\0';
> +
> +	return string(buf, end, output, spec);
> +}
> +
>  static noinline_for_stack
>  char *address_val(char *buf, char *end, const void *addr,
>  		  struct printf_spec spec, const char *fmt)
> @@ -2162,6 +2198,7 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
>   *       correctness of the format string and va_list arguments.
>   * - 'K' For a kernel pointer that should be hidden from unprivileged users
>   * - 'NF' For a netdev_features_t
> + * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
>   * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
>   *            a certain separator (' ' by default):
>   *              C colon
> @@ -2259,6 +2296,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  		return restricted_pointer(buf, end, ptr, spec);
>  	case 'N':
>  		return netdev_bits(buf, end, ptr, spec, fmt);
> +	case '4':
> +		return fourcc_string(buf, end, ptr, spec, fmt);
>  	case 'a':
>  		return address_val(buf, end, ptr, spec, fmt);
>  	case 'd':
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 92e888ed939f..79858e07d023 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -6557,9 +6557,11 @@ sub process {
>  					$specifier = $1;
>  					$extension = $2;
>  					$qualifier = $3;
> -					if ($extension !~ /[SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
> +					if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
>  					    ($extension eq "f" &&
> -					     defined $qualifier && $qualifier !~ /^w/)) {
> +					     defined $qualifier && $qualifier !~ /^w/) ||
> +					    ($extension eq "4" &&
> +					     defined $qualifier && $qualifier !~ /^cc/)) {
>  						$bad_specifier = $specifier;
>  						last;
>  					}
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko


_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Sakari Ailus]

Hi Andy,

On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > so the same implementation can be used.
> 
> This version I almost like, feel free to add
> Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> after considering addressing below nit-picks.
> 
> > Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > Reviewed-by: Petr Mladek <pmladek@suse.com>
> > Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> > ---
> >  Documentation/core-api/printk-formats.rst | 16 ++++++++++
> >  lib/test_printf.c                         | 17 ++++++++++
> >  lib/vsprintf.c                            | 39 +++++++++++++++++++++++
> >  scripts/checkpatch.pl                     |  6 ++--
> >  4 files changed, 76 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
> > index 160e710d992f..da2aa065dc42 100644
> > --- a/Documentation/core-api/printk-formats.rst
> > +++ b/Documentation/core-api/printk-formats.rst
> > @@ -567,6 +567,22 @@ For printing netdev_features_t.
> >  
> >  Passed by reference.
> >  
> > +V4L2 and DRM FourCC code (pixel format)
> > +---------------------------------------
> > +
> > +::
> > +
> > +	%p4cc
> > +
> > +Print a FourCC code used by V4L2 or DRM, including format endianness and
> > +its numerical value as hexadecimal.
> > +
> > +Passed by reference.
> > +
> > +Examples::
> > +
> > +	%p4cc	BG12 little-endian (0x32314742)
> 
> No examples with spaces / non-printable / non-ascii characters

I can sure add an example that has a space. But do you think I really
should add an example where invalid information is being printed?

> 
> > +
> >  Thanks
> >  ======
> >  
> > diff --git a/lib/test_printf.c b/lib/test_printf.c
> > index 7d60f24240a4..9848510a2786 100644
> > --- a/lib/test_printf.c
> > +++ b/lib/test_printf.c
> > @@ -647,6 +647,22 @@ static void __init fwnode_pointer(void)
> >  	software_node_unregister_nodes(softnodes);
> >  }
> >  
> > +static void __init fourcc_pointer(void)
> > +{
> > +	struct {
> > +		u32 code;
> > +		char *str;
> > +	} const try[] = {
> > +		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
> > +		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
> > +		{ 0x10111213, ".... little-endian (0x10111213)", },
> > +	};
> > +	unsigned int i;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(try); i++)
> > +		test(try[i].str, "%p4cc", &try[i].code);
> > +}
> > +
> >  static void __init
> >  errptr(void)
> >  {
> > @@ -692,6 +708,7 @@ test_pointer(void)
> >  	flags();
> >  	errptr();
> >  	fwnode_pointer();
> > +	fourcc_pointer();
> >  }
> >  
> >  static void __init selftest(void)
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > index 3b53c73580c5..432b5a2d1e90 100644
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr,
> >  	return special_hex_number(buf, end, num, size);
> >  }
> >  
> > +static noinline_for_stack
> > +char *fourcc_string(char *buf, char *end, const u32 *fourcc,
> > +		    struct printf_spec spec, const char *fmt)
> > +{
> > +	char output[sizeof("1234 little-endian (0x01234567)")];
> 
> 1234 -> ABCD ? (Or XY12 to be closer to the reality)

I count in numbers... albeit the hexadecimal number there starts from zero.

I guess both would work though.

0123 would be consistent.

-- 
Regards,

Sakari Ailus

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Sakari Ailus]

Hi Andy,

On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > so the same implementation can be used.
> 
> This version I almost like, feel free to add
> Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> after considering addressing below nit-picks.
> 
> > Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > Reviewed-by: Petr Mladek <pmladek@suse.com>
> > Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> > ---
> >  Documentation/core-api/printk-formats.rst | 16 ++++++++++
> >  lib/test_printf.c                         | 17 ++++++++++
> >  lib/vsprintf.c                            | 39 +++++++++++++++++++++++
> >  scripts/checkpatch.pl                     |  6 ++--
> >  4 files changed, 76 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
> > index 160e710d992f..da2aa065dc42 100644
> > --- a/Documentation/core-api/printk-formats.rst
> > +++ b/Documentation/core-api/printk-formats.rst
> > @@ -567,6 +567,22 @@ For printing netdev_features_t.
> >  
> >  Passed by reference.
> >  
> > +V4L2 and DRM FourCC code (pixel format)
> > +---------------------------------------
> > +
> > +::
> > +
> > +	%p4cc
> > +
> > +Print a FourCC code used by V4L2 or DRM, including format endianness and
> > +its numerical value as hexadecimal.
> > +
> > +Passed by reference.
> > +
> > +Examples::
> > +
> > +	%p4cc	BG12 little-endian (0x32314742)
> 
> No examples with spaces / non-printable / non-ascii characters

I can sure add an example that has a space. But do you think I really
should add an example where invalid information is being printed?

> 
> > +
> >  Thanks
> >  ======
> >  
> > diff --git a/lib/test_printf.c b/lib/test_printf.c
> > index 7d60f24240a4..9848510a2786 100644
> > --- a/lib/test_printf.c
> > +++ b/lib/test_printf.c
> > @@ -647,6 +647,22 @@ static void __init fwnode_pointer(void)
> >  	software_node_unregister_nodes(softnodes);
> >  }
> >  
> > +static void __init fourcc_pointer(void)
> > +{
> > +	struct {
> > +		u32 code;
> > +		char *str;
> > +	} const try[] = {
> > +		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
> > +		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
> > +		{ 0x10111213, ".... little-endian (0x10111213)", },
> > +	};
> > +	unsigned int i;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(try); i++)
> > +		test(try[i].str, "%p4cc", &try[i].code);
> > +}
> > +
> >  static void __init
> >  errptr(void)
> >  {
> > @@ -692,6 +708,7 @@ test_pointer(void)
> >  	flags();
> >  	errptr();
> >  	fwnode_pointer();
> > +	fourcc_pointer();
> >  }
> >  
> >  static void __init selftest(void)
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > index 3b53c73580c5..432b5a2d1e90 100644
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -1733,6 +1733,42 @@ char *netdev_bits(char *buf, char *end, const void *addr,
> >  	return special_hex_number(buf, end, num, size);
> >  }
> >  
> > +static noinline_for_stack
> > +char *fourcc_string(char *buf, char *end, const u32 *fourcc,
> > +		    struct printf_spec spec, const char *fmt)
> > +{
> > +	char output[sizeof("1234 little-endian (0x01234567)")];
> 
> 1234 -> ABCD ? (Or XY12 to be closer to the reality)

I count in numbers... albeit the hexadecimal number there starts from zero.

I guess both would work though.

0123 would be consistent.

-- 
Regards,

Sakari Ailus
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > so the same implementation can be used.
> > 
> > This version I almost like, feel free to add
> > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > after considering addressing below nit-picks.

> > > +Examples::
> > > +
> > > +	%p4cc	BG12 little-endian (0x32314742)
> > 
> > No examples with spaces / non-printable / non-ascii characters
> 
> I can sure add an example that has a space. But do you think I really
> should add an example where invalid information is being printed?

I think you have to provide better coverage of what user can get out of this.
Perhaps one example with space and non-printable character is enough.

> > > +	char output[sizeof("1234 little-endian (0x01234567)")];
> > 
> > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> 
> I count in numbers... albeit the hexadecimal number there starts from zero.
> 
> I guess both would work though.
> 
> 0123 would be consistent.

Since letters can be printed the above is confusing a bit. I think XY12 is
closer to the reality than 0123.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > so the same implementation can be used.
> > 
> > This version I almost like, feel free to add
> > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > after considering addressing below nit-picks.

> > > +Examples::
> > > +
> > > +	%p4cc	BG12 little-endian (0x32314742)
> > 
> > No examples with spaces / non-printable / non-ascii characters
> 
> I can sure add an example that has a space. But do you think I really
> should add an example where invalid information is being printed?

I think you have to provide better coverage of what user can get out of this.
Perhaps one example with space and non-printable character is enough.

> > > +	char output[sizeof("1234 little-endian (0x01234567)")];
> > 
> > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> 
> I count in numbers... albeit the hexadecimal number there starts from zero.
> 
> I guess both would work though.
> 
> 0123 would be consistent.

Since letters can be printed the above is confusing a bit. I think XY12 is
closer to the reality than 0123.

-- 
With Best Regards,
Andy Shevchenko


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Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Petr Mladek]

On Mon 2021-02-15 17:54:47, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> > On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > > so the same implementation can be used.
> > > 
> > > This version I almost like, feel free to add
> > > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > > after considering addressing below nit-picks.
> 
> > > > +Examples::
> > > > +
> > > > +	%p4cc	BG12 little-endian (0x32314742)
> > > 
> > > No examples with spaces / non-printable / non-ascii characters
> > 
> > I can sure add an example that has a space. But do you think I really
> > should add an example where invalid information is being printed?
> 
> I think you have to provide better coverage of what user can get out of this.
> Perhaps one example with space and non-printable character is enough.
> 
> > > > +	char output[sizeof("1234 little-endian (0x01234567)")];
> > > 
> > > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> > 
> > I count in numbers... albeit the hexadecimal number there starts from zero.
> > 
> > I guess both would work though.
> > 
> > 0123 would be consistent.
> 
> Since letters can be printed the above is confusing a bit. I think XY12 is
> closer to the reality than 0123.

Ailus, are you going to send v8 with the two small changes? I mean a
selftest with the space and the above sample code.

Anyway, feel free to add:

Reviewed-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Petr Mladek]

On Mon 2021-02-15 17:54:47, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> > On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > > so the same implementation can be used.
> > > 
> > > This version I almost like, feel free to add
> > > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > > after considering addressing below nit-picks.
> 
> > > > +Examples::
> > > > +
> > > > +	%p4cc	BG12 little-endian (0x32314742)
> > > 
> > > No examples with spaces / non-printable / non-ascii characters
> > 
> > I can sure add an example that has a space. But do you think I really
> > should add an example where invalid information is being printed?
> 
> I think you have to provide better coverage of what user can get out of this.
> Perhaps one example with space and non-printable character is enough.
> 
> > > > +	char output[sizeof("1234 little-endian (0x01234567)")];
> > > 
> > > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> > 
> > I count in numbers... albeit the hexadecimal number there starts from zero.
> > 
> > I guess both would work though.
> > 
> > 0123 would be consistent.
> 
> Since letters can be printed the above is confusing a bit. I think XY12 is
> closer to the reality than 0123.

Ailus, are you going to send v8 with the two small changes? I mean a
selftest with the space and the above sample code.

Anyway, feel free to add:

Reviewed-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr
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Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Sakari Ailus]

Hi Petr,

On Mon, Feb 15, 2021 at 05:51:40PM +0100, Petr Mladek wrote:
> On Mon 2021-02-15 17:54:47, Andy Shevchenko wrote:
> > On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> > > On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > > > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > > > so the same implementation can be used.
> > > > 
> > > > This version I almost like, feel free to add
> > > > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > > > after considering addressing below nit-picks.
> > 
> > > > > +Examples::
> > > > > +
> > > > > +	%p4cc	BG12 little-endian (0x32314742)
> > > > 
> > > > No examples with spaces / non-printable / non-ascii characters
> > > 
> > > I can sure add an example that has a space. But do you think I really
> > > should add an example where invalid information is being printed?
> > 
> > I think you have to provide better coverage of what user can get out of this.
> > Perhaps one example with space and non-printable character is enough.
> > 
> > > > > +	char output[sizeof("1234 little-endian (0x01234567)")];
> > > > 
> > > > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> > > 
> > > I count in numbers... albeit the hexadecimal number there starts from zero.
> > > 
> > > I guess both would work though.
> > > 
> > > 0123 would be consistent.
> > 
> > Since letters can be printed the above is confusing a bit. I think XY12 is
> > closer to the reality than 0123.
> 
> Ailus, are you going to send v8 with the two small changes? I mean a
> selftest with the space and the above sample code.

Yes, and a few more examples.

> 
> Anyway, feel free to add:
> 
> Reviewed-by: Petr Mladek <pmladek@suse.com>

Thank you.

It'd be great if we could merge this through the printk tree. Acks are
needed from the DRM people first.

-- 
Regards,

Sakari Ailus

Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

[Sakari Ailus]

Hi Petr,

On Mon, Feb 15, 2021 at 05:51:40PM +0100, Petr Mladek wrote:
> On Mon 2021-02-15 17:54:47, Andy Shevchenko wrote:
> > On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> > > On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > > > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > > > so the same implementation can be used.
> > > > 
> > > > This version I almost like, feel free to add
> > > > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > > > after considering addressing below nit-picks.
> > 
> > > > > +Examples::
> > > > > +
> > > > > +	%p4cc	BG12 little-endian (0x32314742)
> > > > 
> > > > No examples with spaces / non-printable / non-ascii characters
> > > 
> > > I can sure add an example that has a space. But do you think I really
> > > should add an example where invalid information is being printed?
> > 
> > I think you have to provide better coverage of what user can get out of this.
> > Perhaps one example with space and non-printable character is enough.
> > 
> > > > > +	char output[sizeof("1234 little-endian (0x01234567)")];
> > > > 
> > > > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> > > 
> > > I count in numbers... albeit the hexadecimal number there starts from zero.
> > > 
> > > I guess both would work though.
> > > 
> > > 0123 would be consistent.
> > 
> > Since letters can be printed the above is confusing a bit. I think XY12 is
> > closer to the reality than 0123.
> 
> Ailus, are you going to send v8 with the two small changes? I mean a
> selftest with the space and the above sample code.

Yes, and a few more examples.

> 
> Anyway, feel free to add:
> 
> Reviewed-by: Petr Mladek <pmladek@suse.com>

Thank you.

It'd be great if we could merge this through the printk tree. Acks are
needed from the DRM people first.

-- 
Regards,

Sakari Ailus
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[PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Sakari Ailus]

Now that we can print FourCC codes directly using printk, make use of the
feature in V4L2 core.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 85 +++++++---------------------
 1 file changed, 21 insertions(+), 64 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 31d1342e61e8..31662c3a8c9e 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -265,13 +265,9 @@ static void v4l_print_fmtdesc(const void *arg, bool write_only)
 {
 	const struct v4l2_fmtdesc *p = arg;
 
-	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, mbus_code=0x%04x, description='%.*s'\n",
+	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%p4cc, mbus_code=0x%04x, description='%.*s'\n",
 		p->index, prt_names(p->type, v4l2_type_names),
-		p->flags, (p->pixelformat & 0xff),
-		(p->pixelformat >>  8) & 0xff,
-		(p->pixelformat >> 16) & 0xff,
-		(p->pixelformat >> 24) & 0xff,
-		p->mbus_code,
+		p->flags, &p->pixelformat, p->mbus_code,
 		(int)sizeof(p->description), p->description);
 }
 
@@ -293,12 +289,8 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		pix = &p->fmt.pix;
-		pr_cont(", width=%u, height=%u, pixelformat=%c%c%c%c, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
-			pix->width, pix->height,
-			(pix->pixelformat & 0xff),
-			(pix->pixelformat >>  8) & 0xff,
-			(pix->pixelformat >> 16) & 0xff,
-			(pix->pixelformat >> 24) & 0xff,
+		pr_cont(", width=%u, height=%u, pixelformat=%p4cc, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
+			pix->width, pix->height, &pix->pixelformat,
 			prt_names(pix->field, v4l2_field_names),
 			pix->bytesperline, pix->sizeimage,
 			pix->colorspace, pix->flags, pix->ycbcr_enc,
@@ -307,12 +299,8 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 		mp = &p->fmt.pix_mp;
-		pr_cont(", width=%u, height=%u, format=%c%c%c%c, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
-			mp->width, mp->height,
-			(mp->pixelformat & 0xff),
-			(mp->pixelformat >>  8) & 0xff,
-			(mp->pixelformat >> 16) & 0xff,
-			(mp->pixelformat >> 24) & 0xff,
+		pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
+			mp->width, mp->height, &mp->pixelformat,
 			prt_names(mp->field, v4l2_field_names),
 			mp->colorspace, mp->num_planes, mp->flags,
 			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
@@ -337,13 +325,9 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_VBI_CAPTURE:
 	case V4L2_BUF_TYPE_VBI_OUTPUT:
 		vbi = &p->fmt.vbi;
-		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
+		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%p4cc, start=%u,%u, count=%u,%u\n",
 			vbi->sampling_rate, vbi->offset,
-			vbi->samples_per_line,
-			(vbi->sample_format & 0xff),
-			(vbi->sample_format >>  8) & 0xff,
-			(vbi->sample_format >> 16) & 0xff,
-			(vbi->sample_format >> 24) & 0xff,
+			vbi->samples_per_line, &vbi->sample_format,
 			vbi->start[0], vbi->start[1],
 			vbi->count[0], vbi->count[1]);
 		break;
@@ -360,21 +344,13 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_SDR_CAPTURE:
 	case V4L2_BUF_TYPE_SDR_OUTPUT:
 		sdr = &p->fmt.sdr;
-		pr_cont(", pixelformat=%c%c%c%c\n",
-			(sdr->pixelformat >>  0) & 0xff,
-			(sdr->pixelformat >>  8) & 0xff,
-			(sdr->pixelformat >> 16) & 0xff,
-			(sdr->pixelformat >> 24) & 0xff);
+		pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
 		break;
 	case V4L2_BUF_TYPE_META_CAPTURE:
 	case V4L2_BUF_TYPE_META_OUTPUT:
 		meta = &p->fmt.meta;
-		pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
-			(meta->dataformat >>  0) & 0xff,
-			(meta->dataformat >>  8) & 0xff,
-			(meta->dataformat >> 16) & 0xff,
-			(meta->dataformat >> 24) & 0xff,
-			meta->buffersize);
+		pr_cont(", dataformat=%p4cc, buffersize=%u\n",
+			&meta->dataformat, meta->buffersize);
 		break;
 	}
 }
@@ -383,15 +359,10 @@ static void v4l_print_framebuffer(const void *arg, bool write_only)
 {
 	const struct v4l2_framebuffer *p = arg;
 
-	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%c%c%c%c, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
-			p->capability, p->flags, p->base,
-			p->fmt.width, p->fmt.height,
-			(p->fmt.pixelformat & 0xff),
-			(p->fmt.pixelformat >>  8) & 0xff,
-			(p->fmt.pixelformat >> 16) & 0xff,
-			(p->fmt.pixelformat >> 24) & 0xff,
-			p->fmt.bytesperline, p->fmt.sizeimage,
-			p->fmt.colorspace);
+	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%p4cc, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
+		p->capability, p->flags, p->base, p->fmt.width, p->fmt.height,
+		&p->fmt.pixelformat, p->fmt.bytesperline, p->fmt.sizeimage,
+		p->fmt.colorspace);
 }
 
 static void v4l_print_buftype(const void *arg, bool write_only)
@@ -761,13 +732,8 @@ static void v4l_print_frmsizeenum(const void *arg, bool write_only)
 {
 	const struct v4l2_frmsizeenum *p = arg;
 
-	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
-			p->index,
-			(p->pixel_format & 0xff),
-			(p->pixel_format >>  8) & 0xff,
-			(p->pixel_format >> 16) & 0xff,
-			(p->pixel_format >> 24) & 0xff,
-			p->type);
+	pr_cont("index=%u, pixelformat=%p4cc, type=%u",
+		p->index, &p->pixel_format, p->type);
 	switch (p->type) {
 	case V4L2_FRMSIZE_TYPE_DISCRETE:
 		pr_cont(", wxh=%ux%u\n",
@@ -793,13 +759,8 @@ static void v4l_print_frmivalenum(const void *arg, bool write_only)
 {
 	const struct v4l2_frmivalenum *p = arg;
 
-	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
-			p->index,
-			(p->pixel_format & 0xff),
-			(p->pixel_format >>  8) & 0xff,
-			(p->pixel_format >> 16) & 0xff,
-			(p->pixel_format >> 24) & 0xff,
-			p->width, p->height, p->type);
+	pr_cont("index=%u, pixelformat=%p4cc, wxh=%ux%u, type=%u",
+		p->index, &p->pixel_format, p->width, p->height, p->type);
 	switch (p->type) {
 	case V4L2_FRMIVAL_TYPE_DISCRETE:
 		pr_cont(", fps=%d/%d\n",
@@ -1459,12 +1420,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 				return;
 			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
 			flags = 0;
-			snprintf(fmt->description, sz, "%c%c%c%c%s",
-					(char)(fmt->pixelformat & 0x7f),
-					(char)((fmt->pixelformat >> 8) & 0x7f),
-					(char)((fmt->pixelformat >> 16) & 0x7f),
-					(char)((fmt->pixelformat >> 24) & 0x7f),
-					(fmt->pixelformat & (1UL << 31)) ? "-BE" : "");
+			snprintf(fmt->description, sz, "%p4cc",
+				 &fmt->pixelformat);
 			break;
 		}
 	}
-- 
2.29.2

[PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Sakari Ailus]

Now that we can print FourCC codes directly using printk, make use of the
feature in V4L2 core.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 85 +++++++---------------------
 1 file changed, 21 insertions(+), 64 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 31d1342e61e8..31662c3a8c9e 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -265,13 +265,9 @@ static void v4l_print_fmtdesc(const void *arg, bool write_only)
 {
 	const struct v4l2_fmtdesc *p = arg;
 
-	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, mbus_code=0x%04x, description='%.*s'\n",
+	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%p4cc, mbus_code=0x%04x, description='%.*s'\n",
 		p->index, prt_names(p->type, v4l2_type_names),
-		p->flags, (p->pixelformat & 0xff),
-		(p->pixelformat >>  8) & 0xff,
-		(p->pixelformat >> 16) & 0xff,
-		(p->pixelformat >> 24) & 0xff,
-		p->mbus_code,
+		p->flags, &p->pixelformat, p->mbus_code,
 		(int)sizeof(p->description), p->description);
 }
 
@@ -293,12 +289,8 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		pix = &p->fmt.pix;
-		pr_cont(", width=%u, height=%u, pixelformat=%c%c%c%c, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
-			pix->width, pix->height,
-			(pix->pixelformat & 0xff),
-			(pix->pixelformat >>  8) & 0xff,
-			(pix->pixelformat >> 16) & 0xff,
-			(pix->pixelformat >> 24) & 0xff,
+		pr_cont(", width=%u, height=%u, pixelformat=%p4cc, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
+			pix->width, pix->height, &pix->pixelformat,
 			prt_names(pix->field, v4l2_field_names),
 			pix->bytesperline, pix->sizeimage,
 			pix->colorspace, pix->flags, pix->ycbcr_enc,
@@ -307,12 +299,8 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 		mp = &p->fmt.pix_mp;
-		pr_cont(", width=%u, height=%u, format=%c%c%c%c, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
-			mp->width, mp->height,
-			(mp->pixelformat & 0xff),
-			(mp->pixelformat >>  8) & 0xff,
-			(mp->pixelformat >> 16) & 0xff,
-			(mp->pixelformat >> 24) & 0xff,
+		pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
+			mp->width, mp->height, &mp->pixelformat,
 			prt_names(mp->field, v4l2_field_names),
 			mp->colorspace, mp->num_planes, mp->flags,
 			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
@@ -337,13 +325,9 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_VBI_CAPTURE:
 	case V4L2_BUF_TYPE_VBI_OUTPUT:
 		vbi = &p->fmt.vbi;
-		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
+		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%p4cc, start=%u,%u, count=%u,%u\n",
 			vbi->sampling_rate, vbi->offset,
-			vbi->samples_per_line,
-			(vbi->sample_format & 0xff),
-			(vbi->sample_format >>  8) & 0xff,
-			(vbi->sample_format >> 16) & 0xff,
-			(vbi->sample_format >> 24) & 0xff,
+			vbi->samples_per_line, &vbi->sample_format,
 			vbi->start[0], vbi->start[1],
 			vbi->count[0], vbi->count[1]);
 		break;
@@ -360,21 +344,13 @@ static void v4l_print_format(const void *arg, bool write_only)
 	case V4L2_BUF_TYPE_SDR_CAPTURE:
 	case V4L2_BUF_TYPE_SDR_OUTPUT:
 		sdr = &p->fmt.sdr;
-		pr_cont(", pixelformat=%c%c%c%c\n",
-			(sdr->pixelformat >>  0) & 0xff,
-			(sdr->pixelformat >>  8) & 0xff,
-			(sdr->pixelformat >> 16) & 0xff,
-			(sdr->pixelformat >> 24) & 0xff);
+		pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
 		break;
 	case V4L2_BUF_TYPE_META_CAPTURE:
 	case V4L2_BUF_TYPE_META_OUTPUT:
 		meta = &p->fmt.meta;
-		pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
-			(meta->dataformat >>  0) & 0xff,
-			(meta->dataformat >>  8) & 0xff,
-			(meta->dataformat >> 16) & 0xff,
-			(meta->dataformat >> 24) & 0xff,
-			meta->buffersize);
+		pr_cont(", dataformat=%p4cc, buffersize=%u\n",
+			&meta->dataformat, meta->buffersize);
 		break;
 	}
 }
@@ -383,15 +359,10 @@ static void v4l_print_framebuffer(const void *arg, bool write_only)
 {
 	const struct v4l2_framebuffer *p = arg;
 
-	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%c%c%c%c, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
-			p->capability, p->flags, p->base,
-			p->fmt.width, p->fmt.height,
-			(p->fmt.pixelformat & 0xff),
-			(p->fmt.pixelformat >>  8) & 0xff,
-			(p->fmt.pixelformat >> 16) & 0xff,
-			(p->fmt.pixelformat >> 24) & 0xff,
-			p->fmt.bytesperline, p->fmt.sizeimage,
-			p->fmt.colorspace);
+	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%p4cc, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
+		p->capability, p->flags, p->base, p->fmt.width, p->fmt.height,
+		&p->fmt.pixelformat, p->fmt.bytesperline, p->fmt.sizeimage,
+		p->fmt.colorspace);
 }
 
 static void v4l_print_buftype(const void *arg, bool write_only)
@@ -761,13 +732,8 @@ static void v4l_print_frmsizeenum(const void *arg, bool write_only)
 {
 	const struct v4l2_frmsizeenum *p = arg;
 
-	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
-			p->index,
-			(p->pixel_format & 0xff),
-			(p->pixel_format >>  8) & 0xff,
-			(p->pixel_format >> 16) & 0xff,
-			(p->pixel_format >> 24) & 0xff,
-			p->type);
+	pr_cont("index=%u, pixelformat=%p4cc, type=%u",
+		p->index, &p->pixel_format, p->type);
 	switch (p->type) {
 	case V4L2_FRMSIZE_TYPE_DISCRETE:
 		pr_cont(", wxh=%ux%u\n",
@@ -793,13 +759,8 @@ static void v4l_print_frmivalenum(const void *arg, bool write_only)
 {
 	const struct v4l2_frmivalenum *p = arg;
 
-	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
-			p->index,
-			(p->pixel_format & 0xff),
-			(p->pixel_format >>  8) & 0xff,
-			(p->pixel_format >> 16) & 0xff,
-			(p->pixel_format >> 24) & 0xff,
-			p->width, p->height, p->type);
+	pr_cont("index=%u, pixelformat=%p4cc, wxh=%ux%u, type=%u",
+		p->index, &p->pixel_format, p->width, p->height, p->type);
 	switch (p->type) {
 	case V4L2_FRMIVAL_TYPE_DISCRETE:
 		pr_cont(", fps=%d/%d\n",
@@ -1459,12 +1420,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 				return;
 			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
 			flags = 0;
-			snprintf(fmt->description, sz, "%c%c%c%c%s",
-					(char)(fmt->pixelformat & 0x7f),
-					(char)((fmt->pixelformat >> 8) & 0x7f),
-					(char)((fmt->pixelformat >> 16) & 0x7f),
-					(char)((fmt->pixelformat >> 24) & 0x7f),
-					(fmt->pixelformat & (1UL << 31)) ? "-BE" : "");
+			snprintf(fmt->description, sz, "%p4cc",
+				 &fmt->pixelformat);
 			break;
 		}
 	}
-- 
2.29.2

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Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 01:40:29PM +0200, Sakari Ailus wrote:
> Now that we can print FourCC codes directly using printk, make use of the
> feature in V4L2 core.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
See also below.

> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 85 +++++++---------------------
>  1 file changed, 21 insertions(+), 64 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 31d1342e61e8..31662c3a8c9e 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -265,13 +265,9 @@ static void v4l_print_fmtdesc(const void *arg, bool write_only)
>  {
>  	const struct v4l2_fmtdesc *p = arg;
>  
> -	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, mbus_code=0x%04x, description='%.*s'\n",
> +	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%p4cc, mbus_code=0x%04x, description='%.*s'\n",
>  		p->index, prt_names(p->type, v4l2_type_names),
> -		p->flags, (p->pixelformat & 0xff),
> -		(p->pixelformat >>  8) & 0xff,
> -		(p->pixelformat >> 16) & 0xff,
> -		(p->pixelformat >> 24) & 0xff,
> -		p->mbus_code,
> +		p->flags, &p->pixelformat, p->mbus_code,
>  		(int)sizeof(p->description), p->description);
>  }
>  
> @@ -293,12 +289,8 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
>  		pix = &p->fmt.pix;
> -		pr_cont(", width=%u, height=%u, pixelformat=%c%c%c%c, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> -			pix->width, pix->height,
> -			(pix->pixelformat & 0xff),
> -			(pix->pixelformat >>  8) & 0xff,
> -			(pix->pixelformat >> 16) & 0xff,
> -			(pix->pixelformat >> 24) & 0xff,
> +		pr_cont(", width=%u, height=%u, pixelformat=%p4cc, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> +			pix->width, pix->height, &pix->pixelformat,
>  			prt_names(pix->field, v4l2_field_names),
>  			pix->bytesperline, pix->sizeimage,
>  			pix->colorspace, pix->flags, pix->ycbcr_enc,
> @@ -307,12 +299,8 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>  		mp = &p->fmt.pix_mp;
> -		pr_cont(", width=%u, height=%u, format=%c%c%c%c, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> -			mp->width, mp->height,
> -			(mp->pixelformat & 0xff),
> -			(mp->pixelformat >>  8) & 0xff,
> -			(mp->pixelformat >> 16) & 0xff,
> -			(mp->pixelformat >> 24) & 0xff,
> +		pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> +			mp->width, mp->height, &mp->pixelformat,
>  			prt_names(mp->field, v4l2_field_names),
>  			mp->colorspace, mp->num_planes, mp->flags,
>  			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
> @@ -337,13 +325,9 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_VBI_CAPTURE:
>  	case V4L2_BUF_TYPE_VBI_OUTPUT:
>  		vbi = &p->fmt.vbi;
> -		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
> +		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%p4cc, start=%u,%u, count=%u,%u\n",
>  			vbi->sampling_rate, vbi->offset,
> -			vbi->samples_per_line,
> -			(vbi->sample_format & 0xff),
> -			(vbi->sample_format >>  8) & 0xff,
> -			(vbi->sample_format >> 16) & 0xff,
> -			(vbi->sample_format >> 24) & 0xff,
> +			vbi->samples_per_line, &vbi->sample_format,
>  			vbi->start[0], vbi->start[1],
>  			vbi->count[0], vbi->count[1]);
>  		break;
> @@ -360,21 +344,13 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_SDR_CAPTURE:
>  	case V4L2_BUF_TYPE_SDR_OUTPUT:
>  		sdr = &p->fmt.sdr;
> -		pr_cont(", pixelformat=%c%c%c%c\n",
> -			(sdr->pixelformat >>  0) & 0xff,
> -			(sdr->pixelformat >>  8) & 0xff,
> -			(sdr->pixelformat >> 16) & 0xff,
> -			(sdr->pixelformat >> 24) & 0xff);
> +		pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
>  		break;
>  	case V4L2_BUF_TYPE_META_CAPTURE:
>  	case V4L2_BUF_TYPE_META_OUTPUT:
>  		meta = &p->fmt.meta;
> -		pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
> -			(meta->dataformat >>  0) & 0xff,
> -			(meta->dataformat >>  8) & 0xff,
> -			(meta->dataformat >> 16) & 0xff,
> -			(meta->dataformat >> 24) & 0xff,
> -			meta->buffersize);
> +		pr_cont(", dataformat=%p4cc, buffersize=%u\n",
> +			&meta->dataformat, meta->buffersize);
>  		break;
>  	}
>  }
> @@ -383,15 +359,10 @@ static void v4l_print_framebuffer(const void *arg, bool write_only)
>  {
>  	const struct v4l2_framebuffer *p = arg;
>  
> -	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%c%c%c%c, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> -			p->capability, p->flags, p->base,
> -			p->fmt.width, p->fmt.height,
> -			(p->fmt.pixelformat & 0xff),
> -			(p->fmt.pixelformat >>  8) & 0xff,
> -			(p->fmt.pixelformat >> 16) & 0xff,
> -			(p->fmt.pixelformat >> 24) & 0xff,
> -			p->fmt.bytesperline, p->fmt.sizeimage,
> -			p->fmt.colorspace);
> +	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%p4cc, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> +		p->capability, p->flags, p->base, p->fmt.width, p->fmt.height,
> +		&p->fmt.pixelformat, p->fmt.bytesperline, p->fmt.sizeimage,
> +		p->fmt.colorspace);
>  }
>  
>  static void v4l_print_buftype(const void *arg, bool write_only)
> @@ -761,13 +732,8 @@ static void v4l_print_frmsizeenum(const void *arg, bool write_only)
>  {
>  	const struct v4l2_frmsizeenum *p = arg;
>  
> -	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
> -			p->index,
> -			(p->pixel_format & 0xff),
> -			(p->pixel_format >>  8) & 0xff,
> -			(p->pixel_format >> 16) & 0xff,
> -			(p->pixel_format >> 24) & 0xff,
> -			p->type);
> +	pr_cont("index=%u, pixelformat=%p4cc, type=%u",
> +		p->index, &p->pixel_format, p->type);
>  	switch (p->type) {
>  	case V4L2_FRMSIZE_TYPE_DISCRETE:
>  		pr_cont(", wxh=%ux%u\n",
> @@ -793,13 +759,8 @@ static void v4l_print_frmivalenum(const void *arg, bool write_only)
>  {
>  	const struct v4l2_frmivalenum *p = arg;
>  
> -	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
> -			p->index,
> -			(p->pixel_format & 0xff),
> -			(p->pixel_format >>  8) & 0xff,
> -			(p->pixel_format >> 16) & 0xff,
> -			(p->pixel_format >> 24) & 0xff,
> -			p->width, p->height, p->type);
> +	pr_cont("index=%u, pixelformat=%p4cc, wxh=%ux%u, type=%u",
> +		p->index, &p->pixel_format, p->width, p->height, p->type);
>  	switch (p->type) {
>  	case V4L2_FRMIVAL_TYPE_DISCRETE:
>  		pr_cont(", fps=%d/%d\n",
> @@ -1459,12 +1420,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  				return;
>  			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
>  			flags = 0;
> -			snprintf(fmt->description, sz, "%c%c%c%c%s",
> -					(char)(fmt->pixelformat & 0x7f),
> -					(char)((fmt->pixelformat >> 8) & 0x7f),
> -					(char)((fmt->pixelformat >> 16) & 0x7f),
> -					(char)((fmt->pixelformat >> 24) & 0x7f),
> -					(fmt->pixelformat & (1UL << 31)) ? "-BE" : "");

I'm wondering how it handled before the characters 0x80 or so...

> +			snprintf(fmt->description, sz, "%p4cc",
> +				 &fmt->pixelformat);
>  			break;
>  		}
>  	}
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 01:40:29PM +0200, Sakari Ailus wrote:
> Now that we can print FourCC codes directly using printk, make use of the
> feature in V4L2 core.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
See also below.

> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 85 +++++++---------------------
>  1 file changed, 21 insertions(+), 64 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 31d1342e61e8..31662c3a8c9e 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -265,13 +265,9 @@ static void v4l_print_fmtdesc(const void *arg, bool write_only)
>  {
>  	const struct v4l2_fmtdesc *p = arg;
>  
> -	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, mbus_code=0x%04x, description='%.*s'\n",
> +	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%p4cc, mbus_code=0x%04x, description='%.*s'\n",
>  		p->index, prt_names(p->type, v4l2_type_names),
> -		p->flags, (p->pixelformat & 0xff),
> -		(p->pixelformat >>  8) & 0xff,
> -		(p->pixelformat >> 16) & 0xff,
> -		(p->pixelformat >> 24) & 0xff,
> -		p->mbus_code,
> +		p->flags, &p->pixelformat, p->mbus_code,
>  		(int)sizeof(p->description), p->description);
>  }
>  
> @@ -293,12 +289,8 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
>  		pix = &p->fmt.pix;
> -		pr_cont(", width=%u, height=%u, pixelformat=%c%c%c%c, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> -			pix->width, pix->height,
> -			(pix->pixelformat & 0xff),
> -			(pix->pixelformat >>  8) & 0xff,
> -			(pix->pixelformat >> 16) & 0xff,
> -			(pix->pixelformat >> 24) & 0xff,
> +		pr_cont(", width=%u, height=%u, pixelformat=%p4cc, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> +			pix->width, pix->height, &pix->pixelformat,
>  			prt_names(pix->field, v4l2_field_names),
>  			pix->bytesperline, pix->sizeimage,
>  			pix->colorspace, pix->flags, pix->ycbcr_enc,
> @@ -307,12 +299,8 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>  		mp = &p->fmt.pix_mp;
> -		pr_cont(", width=%u, height=%u, format=%c%c%c%c, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> -			mp->width, mp->height,
> -			(mp->pixelformat & 0xff),
> -			(mp->pixelformat >>  8) & 0xff,
> -			(mp->pixelformat >> 16) & 0xff,
> -			(mp->pixelformat >> 24) & 0xff,
> +		pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> +			mp->width, mp->height, &mp->pixelformat,
>  			prt_names(mp->field, v4l2_field_names),
>  			mp->colorspace, mp->num_planes, mp->flags,
>  			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
> @@ -337,13 +325,9 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_VBI_CAPTURE:
>  	case V4L2_BUF_TYPE_VBI_OUTPUT:
>  		vbi = &p->fmt.vbi;
> -		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
> +		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%p4cc, start=%u,%u, count=%u,%u\n",
>  			vbi->sampling_rate, vbi->offset,
> -			vbi->samples_per_line,
> -			(vbi->sample_format & 0xff),
> -			(vbi->sample_format >>  8) & 0xff,
> -			(vbi->sample_format >> 16) & 0xff,
> -			(vbi->sample_format >> 24) & 0xff,
> +			vbi->samples_per_line, &vbi->sample_format,
>  			vbi->start[0], vbi->start[1],
>  			vbi->count[0], vbi->count[1]);
>  		break;
> @@ -360,21 +344,13 @@ static void v4l_print_format(const void *arg, bool write_only)
>  	case V4L2_BUF_TYPE_SDR_CAPTURE:
>  	case V4L2_BUF_TYPE_SDR_OUTPUT:
>  		sdr = &p->fmt.sdr;
> -		pr_cont(", pixelformat=%c%c%c%c\n",
> -			(sdr->pixelformat >>  0) & 0xff,
> -			(sdr->pixelformat >>  8) & 0xff,
> -			(sdr->pixelformat >> 16) & 0xff,
> -			(sdr->pixelformat >> 24) & 0xff);
> +		pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
>  		break;
>  	case V4L2_BUF_TYPE_META_CAPTURE:
>  	case V4L2_BUF_TYPE_META_OUTPUT:
>  		meta = &p->fmt.meta;
> -		pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
> -			(meta->dataformat >>  0) & 0xff,
> -			(meta->dataformat >>  8) & 0xff,
> -			(meta->dataformat >> 16) & 0xff,
> -			(meta->dataformat >> 24) & 0xff,
> -			meta->buffersize);
> +		pr_cont(", dataformat=%p4cc, buffersize=%u\n",
> +			&meta->dataformat, meta->buffersize);
>  		break;
>  	}
>  }
> @@ -383,15 +359,10 @@ static void v4l_print_framebuffer(const void *arg, bool write_only)
>  {
>  	const struct v4l2_framebuffer *p = arg;
>  
> -	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%c%c%c%c, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> -			p->capability, p->flags, p->base,
> -			p->fmt.width, p->fmt.height,
> -			(p->fmt.pixelformat & 0xff),
> -			(p->fmt.pixelformat >>  8) & 0xff,
> -			(p->fmt.pixelformat >> 16) & 0xff,
> -			(p->fmt.pixelformat >> 24) & 0xff,
> -			p->fmt.bytesperline, p->fmt.sizeimage,
> -			p->fmt.colorspace);
> +	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%p4cc, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> +		p->capability, p->flags, p->base, p->fmt.width, p->fmt.height,
> +		&p->fmt.pixelformat, p->fmt.bytesperline, p->fmt.sizeimage,
> +		p->fmt.colorspace);
>  }
>  
>  static void v4l_print_buftype(const void *arg, bool write_only)
> @@ -761,13 +732,8 @@ static void v4l_print_frmsizeenum(const void *arg, bool write_only)
>  {
>  	const struct v4l2_frmsizeenum *p = arg;
>  
> -	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
> -			p->index,
> -			(p->pixel_format & 0xff),
> -			(p->pixel_format >>  8) & 0xff,
> -			(p->pixel_format >> 16) & 0xff,
> -			(p->pixel_format >> 24) & 0xff,
> -			p->type);
> +	pr_cont("index=%u, pixelformat=%p4cc, type=%u",
> +		p->index, &p->pixel_format, p->type);
>  	switch (p->type) {
>  	case V4L2_FRMSIZE_TYPE_DISCRETE:
>  		pr_cont(", wxh=%ux%u\n",
> @@ -793,13 +759,8 @@ static void v4l_print_frmivalenum(const void *arg, bool write_only)
>  {
>  	const struct v4l2_frmivalenum *p = arg;
>  
> -	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
> -			p->index,
> -			(p->pixel_format & 0xff),
> -			(p->pixel_format >>  8) & 0xff,
> -			(p->pixel_format >> 16) & 0xff,
> -			(p->pixel_format >> 24) & 0xff,
> -			p->width, p->height, p->type);
> +	pr_cont("index=%u, pixelformat=%p4cc, wxh=%ux%u, type=%u",
> +		p->index, &p->pixel_format, p->width, p->height, p->type);
>  	switch (p->type) {
>  	case V4L2_FRMIVAL_TYPE_DISCRETE:
>  		pr_cont(", fps=%d/%d\n",
> @@ -1459,12 +1420,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  				return;
>  			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
>  			flags = 0;
> -			snprintf(fmt->description, sz, "%c%c%c%c%s",
> -					(char)(fmt->pixelformat & 0x7f),
> -					(char)((fmt->pixelformat >> 8) & 0x7f),
> -					(char)((fmt->pixelformat >> 16) & 0x7f),
> -					(char)((fmt->pixelformat >> 24) & 0x7f),
> -					(fmt->pixelformat & (1UL << 31)) ? "-BE" : "");

I'm wondering how it handled before the characters 0x80 or so...

> +			snprintf(fmt->description, sz, "%p4cc",
> +				 &fmt->pixelformat);
>  			break;
>  		}
>  	}
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko


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Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Sakari Ailus]

Hi Andy,

On Mon, Feb 15, 2021 at 03:34:04PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 01:40:29PM +0200, Sakari Ailus wrote:
> > Now that we can print FourCC codes directly using printk, make use of the
> > feature in V4L2 core.
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> See also below.

Thanks for the review, and the tag!

> 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >  drivers/media/v4l2-core/v4l2-ioctl.c | 85 +++++++---------------------
> >  1 file changed, 21 insertions(+), 64 deletions(-)
> > 
> > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> > index 31d1342e61e8..31662c3a8c9e 100644
> > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > @@ -265,13 +265,9 @@ static void v4l_print_fmtdesc(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_fmtdesc *p = arg;
> >  
> > -	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, mbus_code=0x%04x, description='%.*s'\n",
> > +	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%p4cc, mbus_code=0x%04x, description='%.*s'\n",
> >  		p->index, prt_names(p->type, v4l2_type_names),
> > -		p->flags, (p->pixelformat & 0xff),
> > -		(p->pixelformat >>  8) & 0xff,
> > -		(p->pixelformat >> 16) & 0xff,
> > -		(p->pixelformat >> 24) & 0xff,
> > -		p->mbus_code,
> > +		p->flags, &p->pixelformat, p->mbus_code,
> >  		(int)sizeof(p->description), p->description);
> >  }
> >  
> > @@ -293,12 +289,8 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
> >  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> >  		pix = &p->fmt.pix;
> > -		pr_cont(", width=%u, height=%u, pixelformat=%c%c%c%c, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > -			pix->width, pix->height,
> > -			(pix->pixelformat & 0xff),
> > -			(pix->pixelformat >>  8) & 0xff,
> > -			(pix->pixelformat >> 16) & 0xff,
> > -			(pix->pixelformat >> 24) & 0xff,
> > +		pr_cont(", width=%u, height=%u, pixelformat=%p4cc, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > +			pix->width, pix->height, &pix->pixelformat,
> >  			prt_names(pix->field, v4l2_field_names),
> >  			pix->bytesperline, pix->sizeimage,
> >  			pix->colorspace, pix->flags, pix->ycbcr_enc,
> > @@ -307,12 +299,8 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
> >  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
> >  		mp = &p->fmt.pix_mp;
> > -		pr_cont(", width=%u, height=%u, format=%c%c%c%c, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > -			mp->width, mp->height,
> > -			(mp->pixelformat & 0xff),
> > -			(mp->pixelformat >>  8) & 0xff,
> > -			(mp->pixelformat >> 16) & 0xff,
> > -			(mp->pixelformat >> 24) & 0xff,
> > +		pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > +			mp->width, mp->height, &mp->pixelformat,
> >  			prt_names(mp->field, v4l2_field_names),
> >  			mp->colorspace, mp->num_planes, mp->flags,
> >  			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
> > @@ -337,13 +325,9 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_VBI_CAPTURE:
> >  	case V4L2_BUF_TYPE_VBI_OUTPUT:
> >  		vbi = &p->fmt.vbi;
> > -		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
> > +		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%p4cc, start=%u,%u, count=%u,%u\n",
> >  			vbi->sampling_rate, vbi->offset,
> > -			vbi->samples_per_line,
> > -			(vbi->sample_format & 0xff),
> > -			(vbi->sample_format >>  8) & 0xff,
> > -			(vbi->sample_format >> 16) & 0xff,
> > -			(vbi->sample_format >> 24) & 0xff,
> > +			vbi->samples_per_line, &vbi->sample_format,
> >  			vbi->start[0], vbi->start[1],
> >  			vbi->count[0], vbi->count[1]);
> >  		break;
> > @@ -360,21 +344,13 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_SDR_CAPTURE:
> >  	case V4L2_BUF_TYPE_SDR_OUTPUT:
> >  		sdr = &p->fmt.sdr;
> > -		pr_cont(", pixelformat=%c%c%c%c\n",
> > -			(sdr->pixelformat >>  0) & 0xff,
> > -			(sdr->pixelformat >>  8) & 0xff,
> > -			(sdr->pixelformat >> 16) & 0xff,
> > -			(sdr->pixelformat >> 24) & 0xff);
> > +		pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
> >  		break;
> >  	case V4L2_BUF_TYPE_META_CAPTURE:
> >  	case V4L2_BUF_TYPE_META_OUTPUT:
> >  		meta = &p->fmt.meta;
> > -		pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
> > -			(meta->dataformat >>  0) & 0xff,
> > -			(meta->dataformat >>  8) & 0xff,
> > -			(meta->dataformat >> 16) & 0xff,
> > -			(meta->dataformat >> 24) & 0xff,
> > -			meta->buffersize);
> > +		pr_cont(", dataformat=%p4cc, buffersize=%u\n",
> > +			&meta->dataformat, meta->buffersize);
> >  		break;
> >  	}
> >  }
> > @@ -383,15 +359,10 @@ static void v4l_print_framebuffer(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_framebuffer *p = arg;
> >  
> > -	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%c%c%c%c, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> > -			p->capability, p->flags, p->base,
> > -			p->fmt.width, p->fmt.height,
> > -			(p->fmt.pixelformat & 0xff),
> > -			(p->fmt.pixelformat >>  8) & 0xff,
> > -			(p->fmt.pixelformat >> 16) & 0xff,
> > -			(p->fmt.pixelformat >> 24) & 0xff,
> > -			p->fmt.bytesperline, p->fmt.sizeimage,
> > -			p->fmt.colorspace);
> > +	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%p4cc, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> > +		p->capability, p->flags, p->base, p->fmt.width, p->fmt.height,
> > +		&p->fmt.pixelformat, p->fmt.bytesperline, p->fmt.sizeimage,
> > +		p->fmt.colorspace);
> >  }
> >  
> >  static void v4l_print_buftype(const void *arg, bool write_only)
> > @@ -761,13 +732,8 @@ static void v4l_print_frmsizeenum(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_frmsizeenum *p = arg;
> >  
> > -	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
> > -			p->index,
> > -			(p->pixel_format & 0xff),
> > -			(p->pixel_format >>  8) & 0xff,
> > -			(p->pixel_format >> 16) & 0xff,
> > -			(p->pixel_format >> 24) & 0xff,
> > -			p->type);
> > +	pr_cont("index=%u, pixelformat=%p4cc, type=%u",
> > +		p->index, &p->pixel_format, p->type);
> >  	switch (p->type) {
> >  	case V4L2_FRMSIZE_TYPE_DISCRETE:
> >  		pr_cont(", wxh=%ux%u\n",
> > @@ -793,13 +759,8 @@ static void v4l_print_frmivalenum(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_frmivalenum *p = arg;
> >  
> > -	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
> > -			p->index,
> > -			(p->pixel_format & 0xff),
> > -			(p->pixel_format >>  8) & 0xff,
> > -			(p->pixel_format >> 16) & 0xff,
> > -			(p->pixel_format >> 24) & 0xff,
> > -			p->width, p->height, p->type);
> > +	pr_cont("index=%u, pixelformat=%p4cc, wxh=%ux%u, type=%u",
> > +		p->index, &p->pixel_format, p->width, p->height, p->type);
> >  	switch (p->type) {
> >  	case V4L2_FRMIVAL_TYPE_DISCRETE:
> >  		pr_cont(", fps=%d/%d\n",
> > @@ -1459,12 +1420,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> >  				return;
> >  			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
> >  			flags = 0;
> > -			snprintf(fmt->description, sz, "%c%c%c%c%s",
> > -					(char)(fmt->pixelformat & 0x7f),
> > -					(char)((fmt->pixelformat >> 8) & 0x7f),
> > -					(char)((fmt->pixelformat >> 16) & 0x7f),
> > -					(char)((fmt->pixelformat >> 24) & 0x7f),
> > -					(fmt->pixelformat & (1UL << 31)) ? "-BE" : "");
> 
> I'm wondering how it handled before the characters 0x80 or so...

The code is different in here than in the other instances but in practice
the output has been the same as the MSB is only set for the endianness
byte.

-- 
Regards,

Sakari Ailus

Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Sakari Ailus]

Hi Andy,

On Mon, Feb 15, 2021 at 03:34:04PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 01:40:29PM +0200, Sakari Ailus wrote:
> > Now that we can print FourCC codes directly using printk, make use of the
> > feature in V4L2 core.
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> See also below.

Thanks for the review, and the tag!

> 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >  drivers/media/v4l2-core/v4l2-ioctl.c | 85 +++++++---------------------
> >  1 file changed, 21 insertions(+), 64 deletions(-)
> > 
> > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> > index 31d1342e61e8..31662c3a8c9e 100644
> > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > @@ -265,13 +265,9 @@ static void v4l_print_fmtdesc(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_fmtdesc *p = arg;
> >  
> > -	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, mbus_code=0x%04x, description='%.*s'\n",
> > +	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%p4cc, mbus_code=0x%04x, description='%.*s'\n",
> >  		p->index, prt_names(p->type, v4l2_type_names),
> > -		p->flags, (p->pixelformat & 0xff),
> > -		(p->pixelformat >>  8) & 0xff,
> > -		(p->pixelformat >> 16) & 0xff,
> > -		(p->pixelformat >> 24) & 0xff,
> > -		p->mbus_code,
> > +		p->flags, &p->pixelformat, p->mbus_code,
> >  		(int)sizeof(p->description), p->description);
> >  }
> >  
> > @@ -293,12 +289,8 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
> >  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> >  		pix = &p->fmt.pix;
> > -		pr_cont(", width=%u, height=%u, pixelformat=%c%c%c%c, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > -			pix->width, pix->height,
> > -			(pix->pixelformat & 0xff),
> > -			(pix->pixelformat >>  8) & 0xff,
> > -			(pix->pixelformat >> 16) & 0xff,
> > -			(pix->pixelformat >> 24) & 0xff,
> > +		pr_cont(", width=%u, height=%u, pixelformat=%p4cc, field=%s, bytesperline=%u, sizeimage=%u, colorspace=%d, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > +			pix->width, pix->height, &pix->pixelformat,
> >  			prt_names(pix->field, v4l2_field_names),
> >  			pix->bytesperline, pix->sizeimage,
> >  			pix->colorspace, pix->flags, pix->ycbcr_enc,
> > @@ -307,12 +299,8 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
> >  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
> >  		mp = &p->fmt.pix_mp;
> > -		pr_cont(", width=%u, height=%u, format=%c%c%c%c, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > -			mp->width, mp->height,
> > -			(mp->pixelformat & 0xff),
> > -			(mp->pixelformat >>  8) & 0xff,
> > -			(mp->pixelformat >> 16) & 0xff,
> > -			(mp->pixelformat >> 24) & 0xff,
> > +		pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
> > +			mp->width, mp->height, &mp->pixelformat,
> >  			prt_names(mp->field, v4l2_field_names),
> >  			mp->colorspace, mp->num_planes, mp->flags,
> >  			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
> > @@ -337,13 +325,9 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_VBI_CAPTURE:
> >  	case V4L2_BUF_TYPE_VBI_OUTPUT:
> >  		vbi = &p->fmt.vbi;
> > -		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
> > +		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, sample_format=%p4cc, start=%u,%u, count=%u,%u\n",
> >  			vbi->sampling_rate, vbi->offset,
> > -			vbi->samples_per_line,
> > -			(vbi->sample_format & 0xff),
> > -			(vbi->sample_format >>  8) & 0xff,
> > -			(vbi->sample_format >> 16) & 0xff,
> > -			(vbi->sample_format >> 24) & 0xff,
> > +			vbi->samples_per_line, &vbi->sample_format,
> >  			vbi->start[0], vbi->start[1],
> >  			vbi->count[0], vbi->count[1]);
> >  		break;
> > @@ -360,21 +344,13 @@ static void v4l_print_format(const void *arg, bool write_only)
> >  	case V4L2_BUF_TYPE_SDR_CAPTURE:
> >  	case V4L2_BUF_TYPE_SDR_OUTPUT:
> >  		sdr = &p->fmt.sdr;
> > -		pr_cont(", pixelformat=%c%c%c%c\n",
> > -			(sdr->pixelformat >>  0) & 0xff,
> > -			(sdr->pixelformat >>  8) & 0xff,
> > -			(sdr->pixelformat >> 16) & 0xff,
> > -			(sdr->pixelformat >> 24) & 0xff);
> > +		pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
> >  		break;
> >  	case V4L2_BUF_TYPE_META_CAPTURE:
> >  	case V4L2_BUF_TYPE_META_OUTPUT:
> >  		meta = &p->fmt.meta;
> > -		pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
> > -			(meta->dataformat >>  0) & 0xff,
> > -			(meta->dataformat >>  8) & 0xff,
> > -			(meta->dataformat >> 16) & 0xff,
> > -			(meta->dataformat >> 24) & 0xff,
> > -			meta->buffersize);
> > +		pr_cont(", dataformat=%p4cc, buffersize=%u\n",
> > +			&meta->dataformat, meta->buffersize);
> >  		break;
> >  	}
> >  }
> > @@ -383,15 +359,10 @@ static void v4l_print_framebuffer(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_framebuffer *p = arg;
> >  
> > -	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%c%c%c%c, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> > -			p->capability, p->flags, p->base,
> > -			p->fmt.width, p->fmt.height,
> > -			(p->fmt.pixelformat & 0xff),
> > -			(p->fmt.pixelformat >>  8) & 0xff,
> > -			(p->fmt.pixelformat >> 16) & 0xff,
> > -			(p->fmt.pixelformat >> 24) & 0xff,
> > -			p->fmt.bytesperline, p->fmt.sizeimage,
> > -			p->fmt.colorspace);
> > +	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, height=%u, pixelformat=%p4cc, bytesperline=%u, sizeimage=%u, colorspace=%d\n",
> > +		p->capability, p->flags, p->base, p->fmt.width, p->fmt.height,
> > +		&p->fmt.pixelformat, p->fmt.bytesperline, p->fmt.sizeimage,
> > +		p->fmt.colorspace);
> >  }
> >  
> >  static void v4l_print_buftype(const void *arg, bool write_only)
> > @@ -761,13 +732,8 @@ static void v4l_print_frmsizeenum(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_frmsizeenum *p = arg;
> >  
> > -	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
> > -			p->index,
> > -			(p->pixel_format & 0xff),
> > -			(p->pixel_format >>  8) & 0xff,
> > -			(p->pixel_format >> 16) & 0xff,
> > -			(p->pixel_format >> 24) & 0xff,
> > -			p->type);
> > +	pr_cont("index=%u, pixelformat=%p4cc, type=%u",
> > +		p->index, &p->pixel_format, p->type);
> >  	switch (p->type) {
> >  	case V4L2_FRMSIZE_TYPE_DISCRETE:
> >  		pr_cont(", wxh=%ux%u\n",
> > @@ -793,13 +759,8 @@ static void v4l_print_frmivalenum(const void *arg, bool write_only)
> >  {
> >  	const struct v4l2_frmivalenum *p = arg;
> >  
> > -	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
> > -			p->index,
> > -			(p->pixel_format & 0xff),
> > -			(p->pixel_format >>  8) & 0xff,
> > -			(p->pixel_format >> 16) & 0xff,
> > -			(p->pixel_format >> 24) & 0xff,
> > -			p->width, p->height, p->type);
> > +	pr_cont("index=%u, pixelformat=%p4cc, wxh=%ux%u, type=%u",
> > +		p->index, &p->pixel_format, p->width, p->height, p->type);
> >  	switch (p->type) {
> >  	case V4L2_FRMIVAL_TYPE_DISCRETE:
> >  		pr_cont(", fps=%d/%d\n",
> > @@ -1459,12 +1420,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> >  				return;
> >  			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
> >  			flags = 0;
> > -			snprintf(fmt->description, sz, "%c%c%c%c%s",
> > -					(char)(fmt->pixelformat & 0x7f),
> > -					(char)((fmt->pixelformat >> 8) & 0x7f),
> > -					(char)((fmt->pixelformat >> 16) & 0x7f),
> > -					(char)((fmt->pixelformat >> 24) & 0x7f),
> > -					(fmt->pixelformat & (1UL << 31)) ? "-BE" : "");
> 
> I'm wondering how it handled before the characters 0x80 or so...

The code is different in here than in the other instances but in practice
the output has been the same as the MSB is only set for the endianness
byte.

-- 
Regards,

Sakari Ailus
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Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Petr Mladek]

On Mon 2021-02-15 13:40:29, Sakari Ailus wrote:
> Now that we can print FourCC codes directly using printk, make use of the
> feature in V4L2 core.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

Reviewed-by: Petr Mladek <pmladek@suse.com>

I am curious whether I could take this via printk tree or if Mauro
would prefer to take this via his tree.

Anyway, there will be v8 with small changes in the 1st patch.

Best Regards,
Petr

Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Petr Mladek]

On Mon 2021-02-15 13:40:29, Sakari Ailus wrote:
> Now that we can print FourCC codes directly using printk, make use of the
> feature in V4L2 core.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

Reviewed-by: Petr Mladek <pmladek@suse.com>

I am curious whether I could take this via printk tree or if Mauro
would prefer to take this via his tree.

Anyway, there will be v8 with small changes in the 1st patch.

Best Regards,
Petr
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Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Mauro Carvalho Chehab]

Em Mon, 15 Feb 2021 17:56:27 +0100
Petr Mladek <pmladek@suse.com> escreveu:

> On Mon 2021-02-15 13:40:29, Sakari Ailus wrote:
> > Now that we can print FourCC codes directly using printk, make use of the
> > feature in V4L2 core.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>  
> 
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> 
> I am curious whether I could take this via printk tree or if Mauro
> would prefer to take this via his tree.

IMO, the best would be if the entire series gets merged via a single
tree.

Feel free to merge via the printk one.

Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

> 
> Anyway, there will be v8 with small changes in the 1st patch.
> 
> Best Regards,
> Petr



Thanks,
Mauro

Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Mauro Carvalho Chehab]

Em Mon, 15 Feb 2021 17:56:27 +0100
Petr Mladek <pmladek@suse.com> escreveu:

> On Mon 2021-02-15 13:40:29, Sakari Ailus wrote:
> > Now that we can print FourCC codes directly using printk, make use of the
> > feature in V4L2 core.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>  
> 
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> 
> I am curious whether I could take this via printk tree or if Mauro
> would prefer to take this via his tree.

IMO, the best would be if the entire series gets merged via a single
tree.

Feel free to merge via the printk one.

Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

> 
> Anyway, there will be v8 with small changes in the 1st patch.
> 
> Best Regards,
> Petr



Thanks,
Mauro
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Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Sakari Ailus]

On Mon, Feb 15, 2021 at 06:05:45PM +0100, Mauro Carvalho Chehab wrote:
> Em Mon, 15 Feb 2021 17:56:27 +0100
> Petr Mladek <pmladek@suse.com> escreveu:
> 
> > On Mon 2021-02-15 13:40:29, Sakari Ailus wrote:
> > > Now that we can print FourCC codes directly using printk, make use of the
> > > feature in V4L2 core.
> > > 
> > > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>  
> > 
> > Reviewed-by: Petr Mladek <pmladek@suse.com>
> > 
> > I am curious whether I could take this via printk tree or if Mauro
> > would prefer to take this via his tree.
> 
> IMO, the best would be if the entire series gets merged via a single
> tree.
> 
> Feel free to merge via the printk one.
> 
> Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Thanks, Mauro!

-- 
Sakari Ailus

Re: [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes

[Sakari Ailus]

On Mon, Feb 15, 2021 at 06:05:45PM +0100, Mauro Carvalho Chehab wrote:
> Em Mon, 15 Feb 2021 17:56:27 +0100
> Petr Mladek <pmladek@suse.com> escreveu:
> 
> > On Mon 2021-02-15 13:40:29, Sakari Ailus wrote:
> > > Now that we can print FourCC codes directly using printk, make use of the
> > > feature in V4L2 core.
> > > 
> > > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>  
> > 
> > Reviewed-by: Petr Mladek <pmladek@suse.com>
> > 
> > I am curious whether I could take this via printk tree or if Mauro
> > would prefer to take this via his tree.
> 
> IMO, the best would be if the entire series gets merged via a single
> tree.
> 
> Feel free to merge via the printk one.
> 
> Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Thanks, Mauro!

-- 
Sakari Ailus
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[PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
large number of temporary variables at the same time.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
 .../arm/display/komeda/komeda_format_caps.h   | 11 --------
 .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
 .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
 drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
 drivers/gpu/drm/drm_atomic.c                  |  8 ++----
 drivers/gpu/drm/drm_crtc.c                    |  7 ++----
 drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
 drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
 drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
 drivers/gpu/drm/drm_plane.c                   |  8 ++----
 .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
 drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
 .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
 drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
 drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
 drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
 drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
 drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
 drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
 include/drm/drm_fourcc.h                      |  1 -
 27 files changed, 64 insertions(+), 157 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index 7944781e1086..ea825b4f8ee8 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -1862,7 +1862,6 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1981,8 +1980,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index 1b6ff0470011..a360a6dec198 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -1904,7 +1904,6 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -2023,8 +2022,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index 83a88385b762..ef124ac853b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -1820,7 +1820,6 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1929,8 +1928,8 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index 224b30214427..c98650183828 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -1791,7 +1791,6 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1902,8 +1901,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index c6da89df055d..fcef3bf14952 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4465,7 +4465,6 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
 	const struct drm_framebuffer *fb = plane_state->fb;
 	const struct amdgpu_framebuffer *afb =
 		to_amdgpu_framebuffer(plane_state->fb);
-	struct drm_format_name_buf format_name;
 	int ret;
 
 	memset(plane_info, 0, sizeof(*plane_info));
@@ -4513,8 +4512,8 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
 		break;
 	default:
 		DRM_ERROR(
-			"Unsupported screen format %s\n",
-			drm_get_format_name(fb->format->format, &format_name));
+			"Unsupported screen format %p4cc\n",
+			&fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
index 32273cf18f7c..cf7a183f773d 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
@@ -82,17 +82,6 @@ struct komeda_format_caps_table {
 
 extern u64 komeda_supported_modifiers[];
 
-static inline const char *komeda_get_format_name(u32 fourcc, u64 modifier)
-{
-	struct drm_format_name_buf buf;
-	static char name[64];
-
-	snprintf(name, sizeof(name), "%s with modifier: 0x%llx.",
-		 drm_get_format_name(fourcc, &buf), modifier);
-
-	return name;
-}
-
 const struct komeda_format_caps *
 komeda_get_format_caps(struct komeda_format_caps_table *table,
 		       u32 fourcc, u64 modifier);
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
index 170f9dc8ec19..3c372d2deb0a 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
@@ -276,8 +276,8 @@ bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
 	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
 						fourcc, modifier, rot);
 	if (!supported)
-		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
-			layer_type, komeda_get_format_name(fourcc, modifier));
+		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %p4cc with modifier: 0x%llx.\n",
+				 layer_type, &fourcc, modifier);
 
 	return supported;
 }
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
index 98e915e325dd..2d5066ea270c 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
@@ -49,10 +49,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
 
 	dflow->rot = drm_rotation_simplify(st->rotation, caps->supported_rots);
 	if (!has_bits(dflow->rot, caps->supported_rots)) {
-		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %s.\n",
-				 dflow->rot,
-				 komeda_get_format_name(caps->fourcc,
-							fb->modifier));
+		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %p4cc with modifier: 0x%llx.\n",
+				 dflow->rot, &caps->fourcc, fb->modifier);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
index 7d0e7b031e44..f5847a79dd7e 100644
--- a/drivers/gpu/drm/arm/malidp_mw.c
+++ b/drivers/gpu/drm/arm/malidp_mw.c
@@ -151,11 +151,8 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
 		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
 					fb->format->format, !!fb->modifier);
 	if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("Invalid pixel format %s\n",
-			      drm_get_format_name(fb->format->format,
-						  &format_name));
+		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
+			      &fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index dda60051854b..ce2ee6b8bf34 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -578,13 +578,9 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
 	ret = drm_plane_check_pixel_format(plane, fb->format->format,
 					   fb->modifier);
 	if (ret) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
+		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
 				 plane->base.id, plane->name,
-				 drm_get_format_name(fb->format->format,
-						     &format_name),
-				 fb->modifier);
+				 &fb->format->format, fb->modifier);
 		return ret;
 	}
 
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 74090fc3aa55..9ba2d3640b47 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -663,11 +663,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 							   fb->format->format,
 							   fb->modifier);
 			if (ret) {
-				struct drm_format_name_buf format_name;
-
-				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
-					      drm_get_format_name(fb->format->format,
-								  &format_name),
+				DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
+					      &fb->format->format,
 					      fb->modifier);
 				goto out;
 			}
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 03262472059c..5cf45aa6eedc 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -30,11 +30,6 @@
 #include <drm/drm_device.h>
 #include <drm/drm_fourcc.h>
 
-static char printable_char(int c)
-{
-	return isascii(c) && isprint(c) ? c : '?';
-}
-
 /**
  * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
  * @bpp: bits per pixels
@@ -130,26 +125,6 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_driver_legacy_fb_format);
 
-/**
- * drm_get_format_name - fill a string with a drm fourcc format's name
- * @format: format to compute name of
- * @buf: caller-supplied buffer
- */
-const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
-{
-	snprintf(buf->str, sizeof(buf->str),
-		 "%c%c%c%c %s-endian (0x%08x)",
-		 printable_char(format & 0xff),
-		 printable_char((format >> 8) & 0xff),
-		 printable_char((format >> 16) & 0xff),
-		 printable_char((format >> 24) & 0x7f),
-		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
-		 format);
-
-	return buf->str;
-}
-EXPORT_SYMBOL(drm_get_format_name);
-
 /*
  * Internal function to query information for a given format. See
  * drm_format_info() for the public API.
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index aca62ed51e82..4d01464b6f95 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -177,11 +177,8 @@ static int framebuffer_check(struct drm_device *dev,
 
 	/* check if the format is supported at all */
 	if (!__drm_format_info(r->pixel_format)) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("bad framebuffer format %s\n",
-			      drm_get_format_name(r->pixel_format,
-						  &format_name));
+		DRM_DEBUG_KMS("bad framebuffer format %p4cc\n",
+			      &r->pixel_format);
 		return -EINVAL;
 	}
 
@@ -1160,14 +1157,12 @@ EXPORT_SYMBOL(drm_framebuffer_plane_height);
 void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
 				const struct drm_framebuffer *fb)
 {
-	struct drm_format_name_buf format_name;
 	unsigned int i;
 
 	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
 	drm_printf_indent(p, indent, "refcount=%u\n",
 			  drm_framebuffer_read_refcount(fb));
-	drm_printf_indent(p, indent, "format=%s\n",
-			  drm_get_format_name(fb->format->format, &format_name));
+	drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
 	drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
 	drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
 	drm_printf_indent(p, indent, "layers:\n");
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index 230c4fd7131c..43a9b739bba7 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -203,7 +203,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
 	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(gem);
 	struct dma_buf_attachment *import_attach = gem->import_attach;
-	struct drm_format_name_buf format_name;
 	void *src = cma_obj->vaddr;
 	int ret = 0;
 
@@ -225,8 +224,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
 		break;
 	default:
-		drm_err_once(fb->dev, "Format is not supported: %s\n",
-			     drm_get_format_name(fb->format->format, &format_name));
+		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
+			     &fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index a0cb746bcb0a..4d8429917d7d 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -623,12 +623,8 @@ static int __setplane_check(struct drm_plane *plane,
 	ret = drm_plane_check_pixel_format(plane, fb->format->format,
 					   fb->modifier);
 	if (ret) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
-			      drm_get_format_name(fb->format->format,
-						  &format_name),
-			      fb->modifier);
+		DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
+			      &fb->format->format, fb->modifier);
 		return ret;
 	}
 
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
index aa6c53f88f7c..70aa6c8844c0 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
@@ -549,16 +549,15 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
 			 u32 ch, u32 y, u32 in_h, u32 fmt)
 {
 	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
-	struct drm_format_name_buf format_name;
 	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
 	u32 stride = fb->pitches[0];
 	u32 addr = (u32)obj->paddr + y * stride;
 
 	DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
 			 ch + 1, y, in_h, stride, (u32)obj->paddr);
-	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
+	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%p4cc)\n",
 			 addr, fb->width, fb->height, fmt,
-			 drm_get_format_name(fb->format->format, &format_name));
+			 &fb->format->format);
 
 	/* get reg offset */
 	reg_ctrl = RD_CH_CTRL(ch);
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 53a00cf3fa32..7981627390a0 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -13319,7 +13319,6 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
 	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
 	struct drm_i915_private *i915 = to_i915(plane->base.dev);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
-	struct drm_format_name_buf format_name;
 
 	if (!fb) {
 		drm_dbg_kms(&i915->drm,
@@ -13330,10 +13329,9 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
 	}
 
 	drm_dbg_kms(&i915->drm,
-		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s modifier = 0x%llx, visible: %s\n",
+		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
 		    plane->base.base.id, plane->base.name,
-		    fb->base.id, fb->width, fb->height,
-		    drm_get_format_name(fb->format->format, &format_name),
+		    fb->base.id, fb->width, fb->height, &fb->format->format,
 		    fb->modifier, yesno(plane_state->uapi.visible));
 	drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
 		    plane_state->hw.rotation, plane_state->scaler_id);
@@ -17927,13 +17925,9 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
 	if (!drm_any_plane_has_format(&dev_priv->drm,
 				      mode_cmd->pixel_format,
 				      mode_cmd->modifier[0])) {
-		struct drm_format_name_buf format_name;
-
 		drm_dbg_kms(&dev_priv->drm,
-			    "unsupported pixel format %s / modifier 0x%llx\n",
-			    drm_get_format_name(mode_cmd->pixel_format,
-						&format_name),
-			    mode_cmd->modifier[0]);
+			    "unsupported pixel format %p4cc / modifier 0x%llx\n",
+			    &mode_cmd->pixel_format, mode_cmd->modifier[0]);
 		goto err;
 	}
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index ca41e8c00ad7..a5c9fe2e56b3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
 	const struct intel_plane_state *plane_state =
 		to_intel_plane_state(plane->base.state);
 	const struct drm_framebuffer *fb = plane_state->uapi.fb;
-	struct drm_format_name_buf format_name;
 	struct drm_rect src, dst;
 	char rot_str[48];
 
 	src = drm_plane_state_src(&plane_state->uapi);
 	dst = drm_plane_state_dest(&plane_state->uapi);
 
-	if (fb)
-		drm_get_format_name(fb->format->format, &format_name);
-
 	plane_rotation(rot_str, sizeof(rot_str),
 		       plane_state->uapi.rotation);
 
-	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
-		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
+	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
+	if (fb)
+		seq_printf(m, "%p4cc", &fb->format->format);
+	else
+		seq_puts(m, "n/a");
+	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
 		   fb ? fb->modifier : 0,
 		   fb ? fb->width : 0, fb ? fb->height : 0,
 		   plane_visibility(plane_state),
@@ -804,19 +804,16 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
 	const struct intel_plane_state *plane_state =
 		to_intel_plane_state(plane->base.state);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
-	struct drm_format_name_buf format_name;
 	char rot_str[48];
 
 	if (!fb)
 		return;
 
-	drm_get_format_name(fb->format->format, &format_name);
-
 	plane_rotation(rot_str, sizeof(rot_str),
 		       plane_state->hw.rotation);
 
-	seq_printf(m, "\t\thw: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
-		   fb->base.id, format_name.str,
+	seq_printf(m, "\t\thw: [FB:%d] %p4cc,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
+		   fb->base.id, &fb->format->format,
 		   fb->modifier, fb->width, fb->height,
 		   yesno(plane_state->uapi.visible),
 		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
index 019a2d6d807a..e4e55d1aec10 100644
--- a/drivers/gpu/drm/i915/display/intel_sprite.c
+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
@@ -2285,7 +2285,6 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
 	unsigned int rotation = plane_state->hw.rotation;
-	struct drm_format_name_buf format_name;
 
 	if (!fb)
 		return 0;
@@ -2333,9 +2332,8 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
 		case DRM_FORMAT_XVYU12_16161616:
 		case DRM_FORMAT_XVYU16161616:
 			drm_dbg_kms(&dev_priv->drm,
-				    "Unsupported pixel format %s for 90/270!\n",
-				    drm_get_format_name(fb->format->format,
-							&format_name));
+				    "Unsupported pixel format %p4cc for 90/270!\n",
+				    &fb->format->format);
 			return -EINVAL;
 		default:
 			break;
diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
index 7c2e0b865441..83ac7493e751 100644
--- a/drivers/gpu/drm/mcde/mcde_display.c
+++ b/drivers/gpu/drm/mcde/mcde_display.c
@@ -1161,7 +1161,6 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
 	int dsi_pkt_size;
 	int fifo_wtrmrk;
 	int cpp = fb->format->cpp[0];
-	struct drm_format_name_buf tmp;
 	u32 dsi_formatter_frame;
 	u32 val;
 	int ret;
@@ -1173,9 +1172,8 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
 		return;
 	}
 
-	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
-		 mode->hdisplay, mode->vdisplay,
-		 drm_get_format_name(format, &tmp));
+	dev_info(drm->dev, "enable MCDE, %d x %d format %p4cc\n",
+		 mode->hdisplay, mode->vdisplay, &format);
 
 
 	/* Clear any pending interrupts */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 56eb22554197..ea9d73983d13 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -71,7 +71,6 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
 {
 	struct dpu_hw_mixer *lm = mixer->hw_lm;
 	uint32_t blend_op;
-	struct drm_format_name_buf format_name;
 
 	/* default to opaque blending */
 	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
@@ -87,9 +86,8 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
 	lm->ops.setup_blend_config(lm, pstate->stage,
 				0xFF, 0, blend_op);
 
-	DPU_DEBUG("format:%s, alpha_en:%u blend_op:0x%x\n",
-		drm_get_format_name(format->base.pixel_format, &format_name),
-		format->alpha_enable, blend_op);
+	DPU_DEBUG("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
+		  &format->base.pixel_format, format->alpha_enable, blend_op);
 }
 
 static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index bceb48a2dfca..a305b749c321 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -322,12 +322,9 @@ nouveau_framebuffer_new(struct drm_device *dev,
 	     mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
 	     (mode_cmd->pitches[1] && /* pitches for planes must match */
 	      mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
-		struct drm_format_name_buf format_name;
-		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n",
-			      drm_get_format_name(mode_cmd->pixel_format,
-						  &format_name),
-			      mode_cmd->pitches[0],
-			      mode_cmd->pitches[1]);
+		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
+			      &mode_cmd->pixel_format,
+			      mode_cmd->pitches[0], mode_cmd->pitches[1]);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 1979ed3d6547..c94e429e75f9 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1157,7 +1157,6 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1267,8 +1266,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
@@ -1478,7 +1477,6 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1579,8 +1577,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index 522e51a404cc..bf8cfefa0365 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -510,7 +510,6 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
 		struct sun4i_layer_state *layer_state =
 			state_to_sun4i_layer_state(plane_state);
 		struct drm_framebuffer *fb = plane_state->fb;
-		struct drm_format_name_buf format_name;
 
 		if (!sun4i_backend_plane_is_supported(plane_state,
 						      &layer_state->uses_frontend))
@@ -527,9 +526,8 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
 			}
 		}
 
-		DRM_DEBUG_DRIVER("Plane FB format is %s\n",
-				 drm_get_format_name(fb->format->format,
-						     &format_name));
+		DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
+				 &fb->format->format);
 		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
 			num_alpha_planes++;
 
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index 78fdc1d59186..0935686475a0 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -42,11 +42,8 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
 	}
 
 	if (fb->format->format != vkms_wb_formats[0]) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("Invalid pixel format %s\n",
-			      drm_get_format_name(fb->format->format,
-						  &format_name));
+		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
+			      &fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index bc67f2b930e1..0cd2c55036bb 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -895,7 +895,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
 	struct vmw_framebuffer_surface *vfbs;
 	enum SVGA3dSurfaceFormat format;
 	int ret;
-	struct drm_format_name_buf format_name;
 
 	/* 3D is only supported on HWv8 and newer hosts */
 	if (dev_priv->active_display_unit == vmw_du_legacy)
@@ -933,8 +932,8 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
 		format = SVGA3D_A1R5G5B5;
 		break;
 	default:
-		DRM_ERROR("Invalid pixel format: %s\n",
-			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
+		DRM_ERROR("Invalid pixel format: %p4cc\n",
+			  &mode_cmd->pixel_format);
 		return -EINVAL;
 	}
 
@@ -1149,7 +1148,6 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
 	uint32_t format;
 	struct vmw_resource *res;
 	unsigned int bytes_pp;
-	struct drm_format_name_buf format_name;
 	int ret;
 
 	switch (mode_cmd->pixel_format) {
@@ -1171,8 +1169,8 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
 		break;
 
 	default:
-		DRM_ERROR("Invalid framebuffer format %s\n",
-			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
+		DRM_ERROR("Invalid framebuffer format %p4cc\n",
+			  &mode_cmd->pixel_format);
 		return -EINVAL;
 	}
 
@@ -1216,7 +1214,6 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
 	struct drm_device *dev = dev_priv->dev;
 	struct vmw_framebuffer_bo *vfbd;
 	unsigned int requested_size;
-	struct drm_format_name_buf format_name;
 	int ret;
 
 	requested_size = mode_cmd->height * mode_cmd->pitches[0];
@@ -1236,8 +1233,8 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
 		case DRM_FORMAT_RGB565:
 			break;
 		default:
-			DRM_ERROR("Invalid pixel format: %s\n",
-				  drm_get_format_name(mode_cmd->pixel_format, &format_name));
+			DRM_ERROR("Invalid pixel format: %p4cc\n",
+				  &mode_cmd->pixel_format);
 			return -EINVAL;
 		}
 	}
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index 156b122c0ad5..3ea17b8a79d3 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -318,6 +318,5 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
 					  int plane);
 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
 				   int plane, unsigned int buffer_width);
-const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
 
 #endif /* __DRM_FOURCC_H__ */
-- 
2.29.2

[PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
large number of temporary variables at the same time.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
 .../arm/display/komeda/komeda_format_caps.h   | 11 --------
 .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
 .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
 drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
 drivers/gpu/drm/drm_atomic.c                  |  8 ++----
 drivers/gpu/drm/drm_crtc.c                    |  7 ++----
 drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
 drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
 drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
 drivers/gpu/drm/drm_plane.c                   |  8 ++----
 .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
 drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
 .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
 drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
 drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
 drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
 drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
 drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
 drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
 include/drm/drm_fourcc.h                      |  1 -
 27 files changed, 64 insertions(+), 157 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index 7944781e1086..ea825b4f8ee8 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -1862,7 +1862,6 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1981,8 +1980,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index 1b6ff0470011..a360a6dec198 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -1904,7 +1904,6 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -2023,8 +2022,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index 83a88385b762..ef124ac853b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -1820,7 +1820,6 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1929,8 +1928,8 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index 224b30214427..c98650183828 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -1791,7 +1791,6 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1902,8 +1901,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index c6da89df055d..fcef3bf14952 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4465,7 +4465,6 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
 	const struct drm_framebuffer *fb = plane_state->fb;
 	const struct amdgpu_framebuffer *afb =
 		to_amdgpu_framebuffer(plane_state->fb);
-	struct drm_format_name_buf format_name;
 	int ret;
 
 	memset(plane_info, 0, sizeof(*plane_info));
@@ -4513,8 +4512,8 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
 		break;
 	default:
 		DRM_ERROR(
-			"Unsupported screen format %s\n",
-			drm_get_format_name(fb->format->format, &format_name));
+			"Unsupported screen format %p4cc\n",
+			&fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
index 32273cf18f7c..cf7a183f773d 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
@@ -82,17 +82,6 @@ struct komeda_format_caps_table {
 
 extern u64 komeda_supported_modifiers[];
 
-static inline const char *komeda_get_format_name(u32 fourcc, u64 modifier)
-{
-	struct drm_format_name_buf buf;
-	static char name[64];
-
-	snprintf(name, sizeof(name), "%s with modifier: 0x%llx.",
-		 drm_get_format_name(fourcc, &buf), modifier);
-
-	return name;
-}
-
 const struct komeda_format_caps *
 komeda_get_format_caps(struct komeda_format_caps_table *table,
 		       u32 fourcc, u64 modifier);
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
index 170f9dc8ec19..3c372d2deb0a 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
@@ -276,8 +276,8 @@ bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
 	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
 						fourcc, modifier, rot);
 	if (!supported)
-		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
-			layer_type, komeda_get_format_name(fourcc, modifier));
+		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %p4cc with modifier: 0x%llx.\n",
+				 layer_type, &fourcc, modifier);
 
 	return supported;
 }
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
index 98e915e325dd..2d5066ea270c 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
@@ -49,10 +49,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
 
 	dflow->rot = drm_rotation_simplify(st->rotation, caps->supported_rots);
 	if (!has_bits(dflow->rot, caps->supported_rots)) {
-		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %s.\n",
-				 dflow->rot,
-				 komeda_get_format_name(caps->fourcc,
-							fb->modifier));
+		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %p4cc with modifier: 0x%llx.\n",
+				 dflow->rot, &caps->fourcc, fb->modifier);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
index 7d0e7b031e44..f5847a79dd7e 100644
--- a/drivers/gpu/drm/arm/malidp_mw.c
+++ b/drivers/gpu/drm/arm/malidp_mw.c
@@ -151,11 +151,8 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
 		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
 					fb->format->format, !!fb->modifier);
 	if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("Invalid pixel format %s\n",
-			      drm_get_format_name(fb->format->format,
-						  &format_name));
+		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
+			      &fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index dda60051854b..ce2ee6b8bf34 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -578,13 +578,9 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
 	ret = drm_plane_check_pixel_format(plane, fb->format->format,
 					   fb->modifier);
 	if (ret) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
+		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
 				 plane->base.id, plane->name,
-				 drm_get_format_name(fb->format->format,
-						     &format_name),
-				 fb->modifier);
+				 &fb->format->format, fb->modifier);
 		return ret;
 	}
 
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 74090fc3aa55..9ba2d3640b47 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -663,11 +663,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 							   fb->format->format,
 							   fb->modifier);
 			if (ret) {
-				struct drm_format_name_buf format_name;
-
-				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
-					      drm_get_format_name(fb->format->format,
-								  &format_name),
+				DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
+					      &fb->format->format,
 					      fb->modifier);
 				goto out;
 			}
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 03262472059c..5cf45aa6eedc 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -30,11 +30,6 @@
 #include <drm/drm_device.h>
 #include <drm/drm_fourcc.h>
 
-static char printable_char(int c)
-{
-	return isascii(c) && isprint(c) ? c : '?';
-}
-
 /**
  * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
  * @bpp: bits per pixels
@@ -130,26 +125,6 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_driver_legacy_fb_format);
 
-/**
- * drm_get_format_name - fill a string with a drm fourcc format's name
- * @format: format to compute name of
- * @buf: caller-supplied buffer
- */
-const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
-{
-	snprintf(buf->str, sizeof(buf->str),
-		 "%c%c%c%c %s-endian (0x%08x)",
-		 printable_char(format & 0xff),
-		 printable_char((format >> 8) & 0xff),
-		 printable_char((format >> 16) & 0xff),
-		 printable_char((format >> 24) & 0x7f),
-		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
-		 format);
-
-	return buf->str;
-}
-EXPORT_SYMBOL(drm_get_format_name);
-
 /*
  * Internal function to query information for a given format. See
  * drm_format_info() for the public API.
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index aca62ed51e82..4d01464b6f95 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -177,11 +177,8 @@ static int framebuffer_check(struct drm_device *dev,
 
 	/* check if the format is supported at all */
 	if (!__drm_format_info(r->pixel_format)) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("bad framebuffer format %s\n",
-			      drm_get_format_name(r->pixel_format,
-						  &format_name));
+		DRM_DEBUG_KMS("bad framebuffer format %p4cc\n",
+			      &r->pixel_format);
 		return -EINVAL;
 	}
 
@@ -1160,14 +1157,12 @@ EXPORT_SYMBOL(drm_framebuffer_plane_height);
 void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
 				const struct drm_framebuffer *fb)
 {
-	struct drm_format_name_buf format_name;
 	unsigned int i;
 
 	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
 	drm_printf_indent(p, indent, "refcount=%u\n",
 			  drm_framebuffer_read_refcount(fb));
-	drm_printf_indent(p, indent, "format=%s\n",
-			  drm_get_format_name(fb->format->format, &format_name));
+	drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
 	drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
 	drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
 	drm_printf_indent(p, indent, "layers:\n");
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index 230c4fd7131c..43a9b739bba7 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -203,7 +203,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
 	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(gem);
 	struct dma_buf_attachment *import_attach = gem->import_attach;
-	struct drm_format_name_buf format_name;
 	void *src = cma_obj->vaddr;
 	int ret = 0;
 
@@ -225,8 +224,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
 		break;
 	default:
-		drm_err_once(fb->dev, "Format is not supported: %s\n",
-			     drm_get_format_name(fb->format->format, &format_name));
+		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
+			     &fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index a0cb746bcb0a..4d8429917d7d 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -623,12 +623,8 @@ static int __setplane_check(struct drm_plane *plane,
 	ret = drm_plane_check_pixel_format(plane, fb->format->format,
 					   fb->modifier);
 	if (ret) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
-			      drm_get_format_name(fb->format->format,
-						  &format_name),
-			      fb->modifier);
+		DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
+			      &fb->format->format, fb->modifier);
 		return ret;
 	}
 
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
index aa6c53f88f7c..70aa6c8844c0 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
@@ -549,16 +549,15 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
 			 u32 ch, u32 y, u32 in_h, u32 fmt)
 {
 	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
-	struct drm_format_name_buf format_name;
 	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
 	u32 stride = fb->pitches[0];
 	u32 addr = (u32)obj->paddr + y * stride;
 
 	DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
 			 ch + 1, y, in_h, stride, (u32)obj->paddr);
-	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
+	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%p4cc)\n",
 			 addr, fb->width, fb->height, fmt,
-			 drm_get_format_name(fb->format->format, &format_name));
+			 &fb->format->format);
 
 	/* get reg offset */
 	reg_ctrl = RD_CH_CTRL(ch);
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 53a00cf3fa32..7981627390a0 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -13319,7 +13319,6 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
 	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
 	struct drm_i915_private *i915 = to_i915(plane->base.dev);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
-	struct drm_format_name_buf format_name;
 
 	if (!fb) {
 		drm_dbg_kms(&i915->drm,
@@ -13330,10 +13329,9 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
 	}
 
 	drm_dbg_kms(&i915->drm,
-		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s modifier = 0x%llx, visible: %s\n",
+		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
 		    plane->base.base.id, plane->base.name,
-		    fb->base.id, fb->width, fb->height,
-		    drm_get_format_name(fb->format->format, &format_name),
+		    fb->base.id, fb->width, fb->height, &fb->format->format,
 		    fb->modifier, yesno(plane_state->uapi.visible));
 	drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
 		    plane_state->hw.rotation, plane_state->scaler_id);
@@ -17927,13 +17925,9 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
 	if (!drm_any_plane_has_format(&dev_priv->drm,
 				      mode_cmd->pixel_format,
 				      mode_cmd->modifier[0])) {
-		struct drm_format_name_buf format_name;
-
 		drm_dbg_kms(&dev_priv->drm,
-			    "unsupported pixel format %s / modifier 0x%llx\n",
-			    drm_get_format_name(mode_cmd->pixel_format,
-						&format_name),
-			    mode_cmd->modifier[0]);
+			    "unsupported pixel format %p4cc / modifier 0x%llx\n",
+			    &mode_cmd->pixel_format, mode_cmd->modifier[0]);
 		goto err;
 	}
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index ca41e8c00ad7..a5c9fe2e56b3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
 	const struct intel_plane_state *plane_state =
 		to_intel_plane_state(plane->base.state);
 	const struct drm_framebuffer *fb = plane_state->uapi.fb;
-	struct drm_format_name_buf format_name;
 	struct drm_rect src, dst;
 	char rot_str[48];
 
 	src = drm_plane_state_src(&plane_state->uapi);
 	dst = drm_plane_state_dest(&plane_state->uapi);
 
-	if (fb)
-		drm_get_format_name(fb->format->format, &format_name);
-
 	plane_rotation(rot_str, sizeof(rot_str),
 		       plane_state->uapi.rotation);
 
-	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
-		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
+	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
+	if (fb)
+		seq_printf(m, "%p4cc", &fb->format->format);
+	else
+		seq_puts(m, "n/a");
+	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
 		   fb ? fb->modifier : 0,
 		   fb ? fb->width : 0, fb ? fb->height : 0,
 		   plane_visibility(plane_state),
@@ -804,19 +804,16 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
 	const struct intel_plane_state *plane_state =
 		to_intel_plane_state(plane->base.state);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
-	struct drm_format_name_buf format_name;
 	char rot_str[48];
 
 	if (!fb)
 		return;
 
-	drm_get_format_name(fb->format->format, &format_name);
-
 	plane_rotation(rot_str, sizeof(rot_str),
 		       plane_state->hw.rotation);
 
-	seq_printf(m, "\t\thw: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
-		   fb->base.id, format_name.str,
+	seq_printf(m, "\t\thw: [FB:%d] %p4cc,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
+		   fb->base.id, &fb->format->format,
 		   fb->modifier, fb->width, fb->height,
 		   yesno(plane_state->uapi.visible),
 		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
index 019a2d6d807a..e4e55d1aec10 100644
--- a/drivers/gpu/drm/i915/display/intel_sprite.c
+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
@@ -2285,7 +2285,6 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
 	unsigned int rotation = plane_state->hw.rotation;
-	struct drm_format_name_buf format_name;
 
 	if (!fb)
 		return 0;
@@ -2333,9 +2332,8 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
 		case DRM_FORMAT_XVYU12_16161616:
 		case DRM_FORMAT_XVYU16161616:
 			drm_dbg_kms(&dev_priv->drm,
-				    "Unsupported pixel format %s for 90/270!\n",
-				    drm_get_format_name(fb->format->format,
-							&format_name));
+				    "Unsupported pixel format %p4cc for 90/270!\n",
+				    &fb->format->format);
 			return -EINVAL;
 		default:
 			break;
diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
index 7c2e0b865441..83ac7493e751 100644
--- a/drivers/gpu/drm/mcde/mcde_display.c
+++ b/drivers/gpu/drm/mcde/mcde_display.c
@@ -1161,7 +1161,6 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
 	int dsi_pkt_size;
 	int fifo_wtrmrk;
 	int cpp = fb->format->cpp[0];
-	struct drm_format_name_buf tmp;
 	u32 dsi_formatter_frame;
 	u32 val;
 	int ret;
@@ -1173,9 +1172,8 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
 		return;
 	}
 
-	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
-		 mode->hdisplay, mode->vdisplay,
-		 drm_get_format_name(format, &tmp));
+	dev_info(drm->dev, "enable MCDE, %d x %d format %p4cc\n",
+		 mode->hdisplay, mode->vdisplay, &format);
 
 
 	/* Clear any pending interrupts */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 56eb22554197..ea9d73983d13 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -71,7 +71,6 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
 {
 	struct dpu_hw_mixer *lm = mixer->hw_lm;
 	uint32_t blend_op;
-	struct drm_format_name_buf format_name;
 
 	/* default to opaque blending */
 	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
@@ -87,9 +86,8 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
 	lm->ops.setup_blend_config(lm, pstate->stage,
 				0xFF, 0, blend_op);
 
-	DPU_DEBUG("format:%s, alpha_en:%u blend_op:0x%x\n",
-		drm_get_format_name(format->base.pixel_format, &format_name),
-		format->alpha_enable, blend_op);
+	DPU_DEBUG("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
+		  &format->base.pixel_format, format->alpha_enable, blend_op);
 }
 
 static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index bceb48a2dfca..a305b749c321 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -322,12 +322,9 @@ nouveau_framebuffer_new(struct drm_device *dev,
 	     mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
 	     (mode_cmd->pitches[1] && /* pitches for planes must match */
 	      mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
-		struct drm_format_name_buf format_name;
-		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n",
-			      drm_get_format_name(mode_cmd->pixel_format,
-						  &format_name),
-			      mode_cmd->pitches[0],
-			      mode_cmd->pitches[1]);
+		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
+			      &mode_cmd->pixel_format,
+			      mode_cmd->pitches[0], mode_cmd->pitches[1]);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 1979ed3d6547..c94e429e75f9 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1157,7 +1157,6 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1267,8 +1266,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
@@ -1478,7 +1477,6 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	struct drm_format_name_buf format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1579,8 +1577,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
 #endif
 		break;
 	default:
-		DRM_ERROR("Unsupported screen format %s\n",
-		          drm_get_format_name(target_fb->format->format, &format_name));
+		DRM_ERROR("Unsupported screen format %p4cc\n",
+			  &target_fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index 522e51a404cc..bf8cfefa0365 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -510,7 +510,6 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
 		struct sun4i_layer_state *layer_state =
 			state_to_sun4i_layer_state(plane_state);
 		struct drm_framebuffer *fb = plane_state->fb;
-		struct drm_format_name_buf format_name;
 
 		if (!sun4i_backend_plane_is_supported(plane_state,
 						      &layer_state->uses_frontend))
@@ -527,9 +526,8 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
 			}
 		}
 
-		DRM_DEBUG_DRIVER("Plane FB format is %s\n",
-				 drm_get_format_name(fb->format->format,
-						     &format_name));
+		DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
+				 &fb->format->format);
 		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
 			num_alpha_planes++;
 
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index 78fdc1d59186..0935686475a0 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -42,11 +42,8 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
 	}
 
 	if (fb->format->format != vkms_wb_formats[0]) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("Invalid pixel format %s\n",
-			      drm_get_format_name(fb->format->format,
-						  &format_name));
+		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
+			      &fb->format->format);
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index bc67f2b930e1..0cd2c55036bb 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -895,7 +895,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
 	struct vmw_framebuffer_surface *vfbs;
 	enum SVGA3dSurfaceFormat format;
 	int ret;
-	struct drm_format_name_buf format_name;
 
 	/* 3D is only supported on HWv8 and newer hosts */
 	if (dev_priv->active_display_unit == vmw_du_legacy)
@@ -933,8 +932,8 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
 		format = SVGA3D_A1R5G5B5;
 		break;
 	default:
-		DRM_ERROR("Invalid pixel format: %s\n",
-			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
+		DRM_ERROR("Invalid pixel format: %p4cc\n",
+			  &mode_cmd->pixel_format);
 		return -EINVAL;
 	}
 
@@ -1149,7 +1148,6 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
 	uint32_t format;
 	struct vmw_resource *res;
 	unsigned int bytes_pp;
-	struct drm_format_name_buf format_name;
 	int ret;
 
 	switch (mode_cmd->pixel_format) {
@@ -1171,8 +1169,8 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
 		break;
 
 	default:
-		DRM_ERROR("Invalid framebuffer format %s\n",
-			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
+		DRM_ERROR("Invalid framebuffer format %p4cc\n",
+			  &mode_cmd->pixel_format);
 		return -EINVAL;
 	}
 
@@ -1216,7 +1214,6 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
 	struct drm_device *dev = dev_priv->dev;
 	struct vmw_framebuffer_bo *vfbd;
 	unsigned int requested_size;
-	struct drm_format_name_buf format_name;
 	int ret;
 
 	requested_size = mode_cmd->height * mode_cmd->pitches[0];
@@ -1236,8 +1233,8 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
 		case DRM_FORMAT_RGB565:
 			break;
 		default:
-			DRM_ERROR("Invalid pixel format: %s\n",
-				  drm_get_format_name(mode_cmd->pixel_format, &format_name));
+			DRM_ERROR("Invalid pixel format: %p4cc\n",
+				  &mode_cmd->pixel_format);
 			return -EINVAL;
 		}
 	}
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index 156b122c0ad5..3ea17b8a79d3 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -318,6 +318,5 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
 					  int plane);
 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
 				   int plane, unsigned int buffer_width);
-const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
 
 #endif /* __DRM_FOURCC_H__ */
-- 
2.29.2

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 01:40:30PM +0200, Sakari Ailus wrote:
> Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> large number of temporary variables at the same time.

What a nice clean up!
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
after addressing nit-picks below.

Side note (no need to implement esp. right now): it seems often it's coupled
with modifier, would be nice to have them together that %p4ccM or so can do it
in one go.

> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
>  .../arm/display/komeda/komeda_format_caps.h   | 11 --------
>  .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
>  .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
>  drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
>  drivers/gpu/drm/drm_atomic.c                  |  8 ++----
>  drivers/gpu/drm/drm_crtc.c                    |  7 ++----
>  drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
>  drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
>  drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
>  drivers/gpu/drm/drm_plane.c                   |  8 ++----
>  .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
>  drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
>  .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
>  drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
>  drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
>  drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
>  drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
>  drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
>  drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
>  include/drm/drm_fourcc.h                      |  1 -
>  27 files changed, 64 insertions(+), 157 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> index 7944781e1086..ea825b4f8ee8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> @@ -1862,7 +1862,6 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 tmp, viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1981,8 +1980,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> index 1b6ff0470011..a360a6dec198 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> @@ -1904,7 +1904,6 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 tmp, viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -2023,8 +2022,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> index 83a88385b762..ef124ac853b6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> @@ -1820,7 +1820,6 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1929,8 +1928,8 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> index 224b30214427..c98650183828 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> @@ -1791,7 +1791,6 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1902,8 +1901,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index c6da89df055d..fcef3bf14952 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4465,7 +4465,6 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>  	const struct drm_framebuffer *fb = plane_state->fb;
>  	const struct amdgpu_framebuffer *afb =
>  		to_amdgpu_framebuffer(plane_state->fb);
> -	struct drm_format_name_buf format_name;
>  	int ret;
>  
>  	memset(plane_info, 0, sizeof(*plane_info));
> @@ -4513,8 +4512,8 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>  		break;
>  	default:
>  		DRM_ERROR(
> -			"Unsupported screen format %s\n",
> -			drm_get_format_name(fb->format->format, &format_name));
> +			"Unsupported screen format %p4cc\n",
> +			&fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> index 32273cf18f7c..cf7a183f773d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> @@ -82,17 +82,6 @@ struct komeda_format_caps_table {
>  
>  extern u64 komeda_supported_modifiers[];
>  
> -static inline const char *komeda_get_format_name(u32 fourcc, u64 modifier)
> -{
> -	struct drm_format_name_buf buf;
> -	static char name[64];
> -
> -	snprintf(name, sizeof(name), "%s with modifier: 0x%llx.",
> -		 drm_get_format_name(fourcc, &buf), modifier);
> -
> -	return name;
> -}
> -
>  const struct komeda_format_caps *
>  komeda_get_format_caps(struct komeda_format_caps_table *table,
>  		       u32 fourcc, u64 modifier);
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> index 170f9dc8ec19..3c372d2deb0a 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> @@ -276,8 +276,8 @@ bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
>  	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
>  						fourcc, modifier, rot);
>  	if (!supported)
> -		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
> -			layer_type, komeda_get_format_name(fourcc, modifier));
> +		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %p4cc with modifier: 0x%llx.\n",
> +				 layer_type, &fourcc, modifier);
>  
>  	return supported;
>  }
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> index 98e915e325dd..2d5066ea270c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> @@ -49,10 +49,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
>  
>  	dflow->rot = drm_rotation_simplify(st->rotation, caps->supported_rots);
>  	if (!has_bits(dflow->rot, caps->supported_rots)) {
> -		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %s.\n",
> -				 dflow->rot,
> -				 komeda_get_format_name(caps->fourcc,
> -							fb->modifier));
> +		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %p4cc with modifier: 0x%llx.\n",
> +				 dflow->rot, &caps->fourcc, fb->modifier);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
> index 7d0e7b031e44..f5847a79dd7e 100644
> --- a/drivers/gpu/drm/arm/malidp_mw.c
> +++ b/drivers/gpu/drm/arm/malidp_mw.c
> @@ -151,11 +151,8 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
>  		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
>  					fb->format->format, !!fb->modifier);
>  	if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index dda60051854b..ce2ee6b8bf34 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -578,13 +578,9 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
>  	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>  					   fb->modifier);
>  	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
> +		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
>  				 plane->base.id, plane->name,
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name),
> -				 fb->modifier);
> +				 &fb->format->format, fb->modifier);
>  		return ret;
>  	}
>  
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 74090fc3aa55..9ba2d3640b47 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -663,11 +663,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
>  							   fb->format->format,
>  							   fb->modifier);
>  			if (ret) {
> -				struct drm_format_name_buf format_name;
> -
> -				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -					      drm_get_format_name(fb->format->format,
> -								  &format_name),
> +				DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +					      &fb->format->format,
>  					      fb->modifier);
>  				goto out;
>  			}
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 03262472059c..5cf45aa6eedc 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -30,11 +30,6 @@
>  #include <drm/drm_device.h>
>  #include <drm/drm_fourcc.h>
>  
> -static char printable_char(int c)
> -{
> -	return isascii(c) && isprint(c) ? c : '?';
> -}

If it goes as an ABI than your dot is incompatible with this and '?' should be
used instead in the patch 1. And I bend towards suggested '?' rather than '.'.

Also it means that you probably would need different specifiers for full and
short formats.

>  /**
>   * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
>   * @bpp: bits per pixels
> @@ -130,26 +125,6 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
>  }
>  EXPORT_SYMBOL(drm_driver_legacy_fb_format);
>  
> -/**
> - * drm_get_format_name - fill a string with a drm fourcc format's name
> - * @format: format to compute name of
> - * @buf: caller-supplied buffer
> - */
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
> -{
> -	snprintf(buf->str, sizeof(buf->str),
> -		 "%c%c%c%c %s-endian (0x%08x)",
> -		 printable_char(format & 0xff),
> -		 printable_char((format >> 8) & 0xff),
> -		 printable_char((format >> 16) & 0xff),
> -		 printable_char((format >> 24) & 0x7f),
> -		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
> -		 format);
> -
> -	return buf->str;
> -}
> -EXPORT_SYMBOL(drm_get_format_name);
> -
>  /*
>   * Internal function to query information for a given format. See
>   * drm_format_info() for the public API.
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index aca62ed51e82..4d01464b6f95 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -177,11 +177,8 @@ static int framebuffer_check(struct drm_device *dev,
>  
>  	/* check if the format is supported at all */
>  	if (!__drm_format_info(r->pixel_format)) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("bad framebuffer format %s\n",
> -			      drm_get_format_name(r->pixel_format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("bad framebuffer format %p4cc\n",
> +			      &r->pixel_format);
>  		return -EINVAL;
>  	}
>  
> @@ -1160,14 +1157,12 @@ EXPORT_SYMBOL(drm_framebuffer_plane_height);
>  void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
>  				const struct drm_framebuffer *fb)
>  {
> -	struct drm_format_name_buf format_name;
>  	unsigned int i;
>  
>  	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
>  	drm_printf_indent(p, indent, "refcount=%u\n",
>  			  drm_framebuffer_read_refcount(fb));
> -	drm_printf_indent(p, indent, "format=%s\n",
> -			  drm_get_format_name(fb->format->format, &format_name));
> +	drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
>  	drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
>  	drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
>  	drm_printf_indent(p, indent, "layers:\n");
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 230c4fd7131c..43a9b739bba7 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -203,7 +203,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
>  	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(gem);
>  	struct dma_buf_attachment *import_attach = gem->import_attach;
> -	struct drm_format_name_buf format_name;
>  	void *src = cma_obj->vaddr;
>  	int ret = 0;
>  
> @@ -225,8 +224,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
>  		break;
>  	default:
> -		drm_err_once(fb->dev, "Format is not supported: %s\n",
> -			     drm_get_format_name(fb->format->format, &format_name));
> +		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
> +			     &fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index a0cb746bcb0a..4d8429917d7d 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -623,12 +623,8 @@ static int __setplane_check(struct drm_plane *plane,
>  	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>  					   fb->modifier);
>  	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name),
> -			      fb->modifier);
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +			      &fb->format->format, fb->modifier);
>  		return ret;
>  	}
>  
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> index aa6c53f88f7c..70aa6c8844c0 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> @@ -549,16 +549,15 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
>  			 u32 ch, u32 y, u32 in_h, u32 fmt)
>  {
>  	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
> -	struct drm_format_name_buf format_name;
>  	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
>  	u32 stride = fb->pitches[0];
>  	u32 addr = (u32)obj->paddr + y * stride;
>  
>  	DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
>  			 ch + 1, y, in_h, stride, (u32)obj->paddr);
> -	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
> +	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%p4cc)\n",
>  			 addr, fb->width, fb->height, fmt,
> -			 drm_get_format_name(fb->format->format, &format_name));
> +			 &fb->format->format);
>  
>  	/* get reg offset */
>  	reg_ctrl = RD_CH_CTRL(ch);
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 53a00cf3fa32..7981627390a0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13319,7 +13319,6 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>  	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
>  	struct drm_i915_private *i915 = to_i915(plane->base.dev);
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>  
>  	if (!fb) {
>  		drm_dbg_kms(&i915->drm,
> @@ -13330,10 +13329,9 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>  	}
>  
>  	drm_dbg_kms(&i915->drm,
> -		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s modifier = 0x%llx, visible: %s\n",
> +		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
>  		    plane->base.base.id, plane->base.name,
> -		    fb->base.id, fb->width, fb->height,
> -		    drm_get_format_name(fb->format->format, &format_name),
> +		    fb->base.id, fb->width, fb->height, &fb->format->format,
>  		    fb->modifier, yesno(plane_state->uapi.visible));
>  	drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
>  		    plane_state->hw.rotation, plane_state->scaler_id);
> @@ -17927,13 +17925,9 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
>  	if (!drm_any_plane_has_format(&dev_priv->drm,
>  				      mode_cmd->pixel_format,
>  				      mode_cmd->modifier[0])) {
> -		struct drm_format_name_buf format_name;
> -
>  		drm_dbg_kms(&dev_priv->drm,
> -			    "unsupported pixel format %s / modifier 0x%llx\n",
> -			    drm_get_format_name(mode_cmd->pixel_format,
> -						&format_name),
> -			    mode_cmd->modifier[0]);
> +			    "unsupported pixel format %p4cc / modifier 0x%llx\n",
> +			    &mode_cmd->pixel_format, mode_cmd->modifier[0]);
>  		goto err;
>  	}
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index ca41e8c00ad7..a5c9fe2e56b3 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
>  	const struct intel_plane_state *plane_state =
>  		to_intel_plane_state(plane->base.state);
>  	const struct drm_framebuffer *fb = plane_state->uapi.fb;
> -	struct drm_format_name_buf format_name;
>  	struct drm_rect src, dst;
>  	char rot_str[48];
>  
>  	src = drm_plane_state_src(&plane_state->uapi);
>  	dst = drm_plane_state_dest(&plane_state->uapi);
>  
> -	if (fb)
> -		drm_get_format_name(fb->format->format, &format_name);
> -
>  	plane_rotation(rot_str, sizeof(rot_str),
>  		       plane_state->uapi.rotation);
>  
> -	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
> +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> +	if (fb)
> +		seq_printf(m, "%p4cc", &fb->format->format);
> +	else
> +		seq_puts(m, "n/a");

> +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",

Why not to keep two seq_printf() calls?

if (fb) {
	seq_printf();
} else {
	seq_printf();
}

?

>  		   fb ? fb->modifier : 0,
>  		   fb ? fb->width : 0, fb ? fb->height : 0,
>  		   plane_visibility(plane_state),
> @@ -804,19 +804,16 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
>  	const struct intel_plane_state *plane_state =
>  		to_intel_plane_state(plane->base.state);
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>  	char rot_str[48];
>  
>  	if (!fb)
>  		return;
>  
> -	drm_get_format_name(fb->format->format, &format_name);
> -
>  	plane_rotation(rot_str, sizeof(rot_str),
>  		       plane_state->hw.rotation);
>  
> -	seq_printf(m, "\t\thw: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb->base.id, format_name.str,
> +	seq_printf(m, "\t\thw: [FB:%d] %p4cc,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> +		   fb->base.id, &fb->format->format,
>  		   fb->modifier, fb->width, fb->height,
>  		   yesno(plane_state->uapi.visible),
>  		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 019a2d6d807a..e4e55d1aec10 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -2285,7 +2285,6 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>  	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
>  	unsigned int rotation = plane_state->hw.rotation;
> -	struct drm_format_name_buf format_name;
>  
>  	if (!fb)
>  		return 0;
> @@ -2333,9 +2332,8 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>  		case DRM_FORMAT_XVYU12_16161616:
>  		case DRM_FORMAT_XVYU16161616:
>  			drm_dbg_kms(&dev_priv->drm,
> -				    "Unsupported pixel format %s for 90/270!\n",
> -				    drm_get_format_name(fb->format->format,
> -							&format_name));
> +				    "Unsupported pixel format %p4cc for 90/270!\n",
> +				    &fb->format->format);
>  			return -EINVAL;
>  		default:
>  			break;
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index 7c2e0b865441..83ac7493e751 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -1161,7 +1161,6 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>  	int dsi_pkt_size;
>  	int fifo_wtrmrk;
>  	int cpp = fb->format->cpp[0];
> -	struct drm_format_name_buf tmp;
>  	u32 dsi_formatter_frame;
>  	u32 val;
>  	int ret;
> @@ -1173,9 +1172,8 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>  		return;
>  	}
>  
> -	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
> -		 mode->hdisplay, mode->vdisplay,
> -		 drm_get_format_name(format, &tmp));
> +	dev_info(drm->dev, "enable MCDE, %d x %d format %p4cc\n",
> +		 mode->hdisplay, mode->vdisplay, &format);
>  
>  
>  	/* Clear any pending interrupts */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 56eb22554197..ea9d73983d13 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -71,7 +71,6 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>  {
>  	struct dpu_hw_mixer *lm = mixer->hw_lm;
>  	uint32_t blend_op;
> -	struct drm_format_name_buf format_name;
>  
>  	/* default to opaque blending */
>  	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
> @@ -87,9 +86,8 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>  	lm->ops.setup_blend_config(lm, pstate->stage,
>  				0xFF, 0, blend_op);
>  
> -	DPU_DEBUG("format:%s, alpha_en:%u blend_op:0x%x\n",
> -		drm_get_format_name(format->base.pixel_format, &format_name),
> -		format->alpha_enable, blend_op);
> +	DPU_DEBUG("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
> +		  &format->base.pixel_format, format->alpha_enable, blend_op);
>  }
>  
>  static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index bceb48a2dfca..a305b749c321 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -322,12 +322,9 @@ nouveau_framebuffer_new(struct drm_device *dev,
>  	     mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
>  	     (mode_cmd->pitches[1] && /* pitches for planes must match */
>  	      mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
> -		struct drm_format_name_buf format_name;
> -		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n",
> -			      drm_get_format_name(mode_cmd->pixel_format,
> -						  &format_name),
> -			      mode_cmd->pitches[0],
> -			      mode_cmd->pitches[1]);
> +		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
> +			      &mode_cmd->pixel_format,
> +			      mode_cmd->pitches[0], mode_cmd->pitches[1]);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
> index 1979ed3d6547..c94e429e75f9 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -1157,7 +1157,6 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 tmp, viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1267,8 +1266,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> @@ -1478,7 +1477,6 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1579,8 +1577,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index 522e51a404cc..bf8cfefa0365 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -510,7 +510,6 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>  		struct sun4i_layer_state *layer_state =
>  			state_to_sun4i_layer_state(plane_state);
>  		struct drm_framebuffer *fb = plane_state->fb;
> -		struct drm_format_name_buf format_name;
>  
>  		if (!sun4i_backend_plane_is_supported(plane_state,
>  						      &layer_state->uses_frontend))
> @@ -527,9 +526,8 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>  			}
>  		}
>  
> -		DRM_DEBUG_DRIVER("Plane FB format is %s\n",
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name));
> +		DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
> +				 &fb->format->format);
>  		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
>  			num_alpha_planes++;
>  
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> index 78fdc1d59186..0935686475a0 100644
> --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -42,11 +42,8 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
>  	}
>  
>  	if (fb->format->format != vkms_wb_formats[0]) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index bc67f2b930e1..0cd2c55036bb 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -895,7 +895,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>  	struct vmw_framebuffer_surface *vfbs;
>  	enum SVGA3dSurfaceFormat format;
>  	int ret;
> -	struct drm_format_name_buf format_name;
>  
>  	/* 3D is only supported on HWv8 and newer hosts */
>  	if (dev_priv->active_display_unit == vmw_du_legacy)
> @@ -933,8 +932,8 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>  		format = SVGA3D_A1R5G5B5;
>  		break;
>  	default:
> -		DRM_ERROR("Invalid pixel format: %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid pixel format: %p4cc\n",
> +			  &mode_cmd->pixel_format);
>  		return -EINVAL;
>  	}
>  
> @@ -1149,7 +1148,6 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>  	uint32_t format;
>  	struct vmw_resource *res;
>  	unsigned int bytes_pp;
> -	struct drm_format_name_buf format_name;
>  	int ret;
>  
>  	switch (mode_cmd->pixel_format) {
> @@ -1171,8 +1169,8 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>  		break;
>  
>  	default:
> -		DRM_ERROR("Invalid framebuffer format %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid framebuffer format %p4cc\n",
> +			  &mode_cmd->pixel_format);
>  		return -EINVAL;
>  	}
>  
> @@ -1216,7 +1214,6 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>  	struct drm_device *dev = dev_priv->dev;
>  	struct vmw_framebuffer_bo *vfbd;
>  	unsigned int requested_size;
> -	struct drm_format_name_buf format_name;
>  	int ret;
>  
>  	requested_size = mode_cmd->height * mode_cmd->pitches[0];
> @@ -1236,8 +1233,8 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>  		case DRM_FORMAT_RGB565:
>  			break;
>  		default:
> -			DRM_ERROR("Invalid pixel format: %s\n",
> -				  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +			DRM_ERROR("Invalid pixel format: %p4cc\n",
> +				  &mode_cmd->pixel_format);
>  			return -EINVAL;
>  		}
>  	}
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 156b122c0ad5..3ea17b8a79d3 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -318,6 +318,5 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
>  					  int plane);
>  uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
>  				   int plane, unsigned int buffer_width);
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
>  
>  #endif /* __DRM_FOURCC_H__ */
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 01:40:30PM +0200, Sakari Ailus wrote:
> Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> large number of temporary variables at the same time.

What a nice clean up!
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
after addressing nit-picks below.

Side note (no need to implement esp. right now): it seems often it's coupled
with modifier, would be nice to have them together that %p4ccM or so can do it
in one go.

> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
>  .../arm/display/komeda/komeda_format_caps.h   | 11 --------
>  .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
>  .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
>  drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
>  drivers/gpu/drm/drm_atomic.c                  |  8 ++----
>  drivers/gpu/drm/drm_crtc.c                    |  7 ++----
>  drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
>  drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
>  drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
>  drivers/gpu/drm/drm_plane.c                   |  8 ++----
>  .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
>  drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
>  .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
>  drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
>  drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
>  drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
>  drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
>  drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
>  drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
>  include/drm/drm_fourcc.h                      |  1 -
>  27 files changed, 64 insertions(+), 157 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> index 7944781e1086..ea825b4f8ee8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> @@ -1862,7 +1862,6 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 tmp, viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1981,8 +1980,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> index 1b6ff0470011..a360a6dec198 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> @@ -1904,7 +1904,6 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 tmp, viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -2023,8 +2022,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> index 83a88385b762..ef124ac853b6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> @@ -1820,7 +1820,6 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1929,8 +1928,8 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> index 224b30214427..c98650183828 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> @@ -1791,7 +1791,6 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1902,8 +1901,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index c6da89df055d..fcef3bf14952 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4465,7 +4465,6 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>  	const struct drm_framebuffer *fb = plane_state->fb;
>  	const struct amdgpu_framebuffer *afb =
>  		to_amdgpu_framebuffer(plane_state->fb);
> -	struct drm_format_name_buf format_name;
>  	int ret;
>  
>  	memset(plane_info, 0, sizeof(*plane_info));
> @@ -4513,8 +4512,8 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>  		break;
>  	default:
>  		DRM_ERROR(
> -			"Unsupported screen format %s\n",
> -			drm_get_format_name(fb->format->format, &format_name));
> +			"Unsupported screen format %p4cc\n",
> +			&fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> index 32273cf18f7c..cf7a183f773d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> @@ -82,17 +82,6 @@ struct komeda_format_caps_table {
>  
>  extern u64 komeda_supported_modifiers[];
>  
> -static inline const char *komeda_get_format_name(u32 fourcc, u64 modifier)
> -{
> -	struct drm_format_name_buf buf;
> -	static char name[64];
> -
> -	snprintf(name, sizeof(name), "%s with modifier: 0x%llx.",
> -		 drm_get_format_name(fourcc, &buf), modifier);
> -
> -	return name;
> -}
> -
>  const struct komeda_format_caps *
>  komeda_get_format_caps(struct komeda_format_caps_table *table,
>  		       u32 fourcc, u64 modifier);
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> index 170f9dc8ec19..3c372d2deb0a 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> @@ -276,8 +276,8 @@ bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
>  	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
>  						fourcc, modifier, rot);
>  	if (!supported)
> -		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
> -			layer_type, komeda_get_format_name(fourcc, modifier));
> +		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %p4cc with modifier: 0x%llx.\n",
> +				 layer_type, &fourcc, modifier);
>  
>  	return supported;
>  }
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> index 98e915e325dd..2d5066ea270c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> @@ -49,10 +49,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
>  
>  	dflow->rot = drm_rotation_simplify(st->rotation, caps->supported_rots);
>  	if (!has_bits(dflow->rot, caps->supported_rots)) {
> -		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %s.\n",
> -				 dflow->rot,
> -				 komeda_get_format_name(caps->fourcc,
> -							fb->modifier));
> +		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %p4cc with modifier: 0x%llx.\n",
> +				 dflow->rot, &caps->fourcc, fb->modifier);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
> index 7d0e7b031e44..f5847a79dd7e 100644
> --- a/drivers/gpu/drm/arm/malidp_mw.c
> +++ b/drivers/gpu/drm/arm/malidp_mw.c
> @@ -151,11 +151,8 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
>  		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
>  					fb->format->format, !!fb->modifier);
>  	if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index dda60051854b..ce2ee6b8bf34 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -578,13 +578,9 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
>  	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>  					   fb->modifier);
>  	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
> +		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
>  				 plane->base.id, plane->name,
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name),
> -				 fb->modifier);
> +				 &fb->format->format, fb->modifier);
>  		return ret;
>  	}
>  
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 74090fc3aa55..9ba2d3640b47 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -663,11 +663,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
>  							   fb->format->format,
>  							   fb->modifier);
>  			if (ret) {
> -				struct drm_format_name_buf format_name;
> -
> -				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -					      drm_get_format_name(fb->format->format,
> -								  &format_name),
> +				DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +					      &fb->format->format,
>  					      fb->modifier);
>  				goto out;
>  			}
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 03262472059c..5cf45aa6eedc 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -30,11 +30,6 @@
>  #include <drm/drm_device.h>
>  #include <drm/drm_fourcc.h>
>  
> -static char printable_char(int c)
> -{
> -	return isascii(c) && isprint(c) ? c : '?';
> -}

If it goes as an ABI than your dot is incompatible with this and '?' should be
used instead in the patch 1. And I bend towards suggested '?' rather than '.'.

Also it means that you probably would need different specifiers for full and
short formats.

>  /**
>   * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
>   * @bpp: bits per pixels
> @@ -130,26 +125,6 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
>  }
>  EXPORT_SYMBOL(drm_driver_legacy_fb_format);
>  
> -/**
> - * drm_get_format_name - fill a string with a drm fourcc format's name
> - * @format: format to compute name of
> - * @buf: caller-supplied buffer
> - */
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
> -{
> -	snprintf(buf->str, sizeof(buf->str),
> -		 "%c%c%c%c %s-endian (0x%08x)",
> -		 printable_char(format & 0xff),
> -		 printable_char((format >> 8) & 0xff),
> -		 printable_char((format >> 16) & 0xff),
> -		 printable_char((format >> 24) & 0x7f),
> -		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
> -		 format);
> -
> -	return buf->str;
> -}
> -EXPORT_SYMBOL(drm_get_format_name);
> -
>  /*
>   * Internal function to query information for a given format. See
>   * drm_format_info() for the public API.
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index aca62ed51e82..4d01464b6f95 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -177,11 +177,8 @@ static int framebuffer_check(struct drm_device *dev,
>  
>  	/* check if the format is supported at all */
>  	if (!__drm_format_info(r->pixel_format)) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("bad framebuffer format %s\n",
> -			      drm_get_format_name(r->pixel_format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("bad framebuffer format %p4cc\n",
> +			      &r->pixel_format);
>  		return -EINVAL;
>  	}
>  
> @@ -1160,14 +1157,12 @@ EXPORT_SYMBOL(drm_framebuffer_plane_height);
>  void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
>  				const struct drm_framebuffer *fb)
>  {
> -	struct drm_format_name_buf format_name;
>  	unsigned int i;
>  
>  	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
>  	drm_printf_indent(p, indent, "refcount=%u\n",
>  			  drm_framebuffer_read_refcount(fb));
> -	drm_printf_indent(p, indent, "format=%s\n",
> -			  drm_get_format_name(fb->format->format, &format_name));
> +	drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
>  	drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
>  	drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
>  	drm_printf_indent(p, indent, "layers:\n");
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 230c4fd7131c..43a9b739bba7 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -203,7 +203,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
>  	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(gem);
>  	struct dma_buf_attachment *import_attach = gem->import_attach;
> -	struct drm_format_name_buf format_name;
>  	void *src = cma_obj->vaddr;
>  	int ret = 0;
>  
> @@ -225,8 +224,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
>  		break;
>  	default:
> -		drm_err_once(fb->dev, "Format is not supported: %s\n",
> -			     drm_get_format_name(fb->format->format, &format_name));
> +		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
> +			     &fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index a0cb746bcb0a..4d8429917d7d 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -623,12 +623,8 @@ static int __setplane_check(struct drm_plane *plane,
>  	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>  					   fb->modifier);
>  	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name),
> -			      fb->modifier);
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +			      &fb->format->format, fb->modifier);
>  		return ret;
>  	}
>  
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> index aa6c53f88f7c..70aa6c8844c0 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> @@ -549,16 +549,15 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
>  			 u32 ch, u32 y, u32 in_h, u32 fmt)
>  {
>  	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
> -	struct drm_format_name_buf format_name;
>  	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
>  	u32 stride = fb->pitches[0];
>  	u32 addr = (u32)obj->paddr + y * stride;
>  
>  	DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
>  			 ch + 1, y, in_h, stride, (u32)obj->paddr);
> -	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
> +	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%p4cc)\n",
>  			 addr, fb->width, fb->height, fmt,
> -			 drm_get_format_name(fb->format->format, &format_name));
> +			 &fb->format->format);
>  
>  	/* get reg offset */
>  	reg_ctrl = RD_CH_CTRL(ch);
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 53a00cf3fa32..7981627390a0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13319,7 +13319,6 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>  	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
>  	struct drm_i915_private *i915 = to_i915(plane->base.dev);
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>  
>  	if (!fb) {
>  		drm_dbg_kms(&i915->drm,
> @@ -13330,10 +13329,9 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>  	}
>  
>  	drm_dbg_kms(&i915->drm,
> -		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s modifier = 0x%llx, visible: %s\n",
> +		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
>  		    plane->base.base.id, plane->base.name,
> -		    fb->base.id, fb->width, fb->height,
> -		    drm_get_format_name(fb->format->format, &format_name),
> +		    fb->base.id, fb->width, fb->height, &fb->format->format,
>  		    fb->modifier, yesno(plane_state->uapi.visible));
>  	drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
>  		    plane_state->hw.rotation, plane_state->scaler_id);
> @@ -17927,13 +17925,9 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
>  	if (!drm_any_plane_has_format(&dev_priv->drm,
>  				      mode_cmd->pixel_format,
>  				      mode_cmd->modifier[0])) {
> -		struct drm_format_name_buf format_name;
> -
>  		drm_dbg_kms(&dev_priv->drm,
> -			    "unsupported pixel format %s / modifier 0x%llx\n",
> -			    drm_get_format_name(mode_cmd->pixel_format,
> -						&format_name),
> -			    mode_cmd->modifier[0]);
> +			    "unsupported pixel format %p4cc / modifier 0x%llx\n",
> +			    &mode_cmd->pixel_format, mode_cmd->modifier[0]);
>  		goto err;
>  	}
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index ca41e8c00ad7..a5c9fe2e56b3 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
>  	const struct intel_plane_state *plane_state =
>  		to_intel_plane_state(plane->base.state);
>  	const struct drm_framebuffer *fb = plane_state->uapi.fb;
> -	struct drm_format_name_buf format_name;
>  	struct drm_rect src, dst;
>  	char rot_str[48];
>  
>  	src = drm_plane_state_src(&plane_state->uapi);
>  	dst = drm_plane_state_dest(&plane_state->uapi);
>  
> -	if (fb)
> -		drm_get_format_name(fb->format->format, &format_name);
> -
>  	plane_rotation(rot_str, sizeof(rot_str),
>  		       plane_state->uapi.rotation);
>  
> -	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
> +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> +	if (fb)
> +		seq_printf(m, "%p4cc", &fb->format->format);
> +	else
> +		seq_puts(m, "n/a");

> +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",

Why not to keep two seq_printf() calls?

if (fb) {
	seq_printf();
} else {
	seq_printf();
}

?

>  		   fb ? fb->modifier : 0,
>  		   fb ? fb->width : 0, fb ? fb->height : 0,
>  		   plane_visibility(plane_state),
> @@ -804,19 +804,16 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
>  	const struct intel_plane_state *plane_state =
>  		to_intel_plane_state(plane->base.state);
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>  	char rot_str[48];
>  
>  	if (!fb)
>  		return;
>  
> -	drm_get_format_name(fb->format->format, &format_name);
> -
>  	plane_rotation(rot_str, sizeof(rot_str),
>  		       plane_state->hw.rotation);
>  
> -	seq_printf(m, "\t\thw: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb->base.id, format_name.str,
> +	seq_printf(m, "\t\thw: [FB:%d] %p4cc,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> +		   fb->base.id, &fb->format->format,
>  		   fb->modifier, fb->width, fb->height,
>  		   yesno(plane_state->uapi.visible),
>  		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 019a2d6d807a..e4e55d1aec10 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -2285,7 +2285,6 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>  	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
>  	unsigned int rotation = plane_state->hw.rotation;
> -	struct drm_format_name_buf format_name;
>  
>  	if (!fb)
>  		return 0;
> @@ -2333,9 +2332,8 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>  		case DRM_FORMAT_XVYU12_16161616:
>  		case DRM_FORMAT_XVYU16161616:
>  			drm_dbg_kms(&dev_priv->drm,
> -				    "Unsupported pixel format %s for 90/270!\n",
> -				    drm_get_format_name(fb->format->format,
> -							&format_name));
> +				    "Unsupported pixel format %p4cc for 90/270!\n",
> +				    &fb->format->format);
>  			return -EINVAL;
>  		default:
>  			break;
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index 7c2e0b865441..83ac7493e751 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -1161,7 +1161,6 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>  	int dsi_pkt_size;
>  	int fifo_wtrmrk;
>  	int cpp = fb->format->cpp[0];
> -	struct drm_format_name_buf tmp;
>  	u32 dsi_formatter_frame;
>  	u32 val;
>  	int ret;
> @@ -1173,9 +1172,8 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>  		return;
>  	}
>  
> -	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
> -		 mode->hdisplay, mode->vdisplay,
> -		 drm_get_format_name(format, &tmp));
> +	dev_info(drm->dev, "enable MCDE, %d x %d format %p4cc\n",
> +		 mode->hdisplay, mode->vdisplay, &format);
>  
>  
>  	/* Clear any pending interrupts */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 56eb22554197..ea9d73983d13 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -71,7 +71,6 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>  {
>  	struct dpu_hw_mixer *lm = mixer->hw_lm;
>  	uint32_t blend_op;
> -	struct drm_format_name_buf format_name;
>  
>  	/* default to opaque blending */
>  	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
> @@ -87,9 +86,8 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>  	lm->ops.setup_blend_config(lm, pstate->stage,
>  				0xFF, 0, blend_op);
>  
> -	DPU_DEBUG("format:%s, alpha_en:%u blend_op:0x%x\n",
> -		drm_get_format_name(format->base.pixel_format, &format_name),
> -		format->alpha_enable, blend_op);
> +	DPU_DEBUG("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
> +		  &format->base.pixel_format, format->alpha_enable, blend_op);
>  }
>  
>  static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index bceb48a2dfca..a305b749c321 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -322,12 +322,9 @@ nouveau_framebuffer_new(struct drm_device *dev,
>  	     mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
>  	     (mode_cmd->pitches[1] && /* pitches for planes must match */
>  	      mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
> -		struct drm_format_name_buf format_name;
> -		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n",
> -			      drm_get_format_name(mode_cmd->pixel_format,
> -						  &format_name),
> -			      mode_cmd->pitches[0],
> -			      mode_cmd->pitches[1]);
> +		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
> +			      &mode_cmd->pixel_format,
> +			      mode_cmd->pitches[0], mode_cmd->pitches[1]);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
> index 1979ed3d6547..c94e429e75f9 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -1157,7 +1157,6 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 tmp, viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1267,8 +1266,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> @@ -1478,7 +1477,6 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>  	u32 viewport_w, viewport_h;
>  	int r;
>  	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>  
>  	/* no fb bound */
>  	if (!atomic && !crtc->primary->fb) {
> @@ -1579,8 +1577,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>  #endif
>  		break;
>  	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index 522e51a404cc..bf8cfefa0365 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -510,7 +510,6 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>  		struct sun4i_layer_state *layer_state =
>  			state_to_sun4i_layer_state(plane_state);
>  		struct drm_framebuffer *fb = plane_state->fb;
> -		struct drm_format_name_buf format_name;
>  
>  		if (!sun4i_backend_plane_is_supported(plane_state,
>  						      &layer_state->uses_frontend))
> @@ -527,9 +526,8 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>  			}
>  		}
>  
> -		DRM_DEBUG_DRIVER("Plane FB format is %s\n",
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name));
> +		DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
> +				 &fb->format->format);
>  		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
>  			num_alpha_planes++;
>  
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> index 78fdc1d59186..0935686475a0 100644
> --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -42,11 +42,8 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
>  	}
>  
>  	if (fb->format->format != vkms_wb_formats[0]) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index bc67f2b930e1..0cd2c55036bb 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -895,7 +895,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>  	struct vmw_framebuffer_surface *vfbs;
>  	enum SVGA3dSurfaceFormat format;
>  	int ret;
> -	struct drm_format_name_buf format_name;
>  
>  	/* 3D is only supported on HWv8 and newer hosts */
>  	if (dev_priv->active_display_unit == vmw_du_legacy)
> @@ -933,8 +932,8 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>  		format = SVGA3D_A1R5G5B5;
>  		break;
>  	default:
> -		DRM_ERROR("Invalid pixel format: %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid pixel format: %p4cc\n",
> +			  &mode_cmd->pixel_format);
>  		return -EINVAL;
>  	}
>  
> @@ -1149,7 +1148,6 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>  	uint32_t format;
>  	struct vmw_resource *res;
>  	unsigned int bytes_pp;
> -	struct drm_format_name_buf format_name;
>  	int ret;
>  
>  	switch (mode_cmd->pixel_format) {
> @@ -1171,8 +1169,8 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>  		break;
>  
>  	default:
> -		DRM_ERROR("Invalid framebuffer format %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid framebuffer format %p4cc\n",
> +			  &mode_cmd->pixel_format);
>  		return -EINVAL;
>  	}
>  
> @@ -1216,7 +1214,6 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>  	struct drm_device *dev = dev_priv->dev;
>  	struct vmw_framebuffer_bo *vfbd;
>  	unsigned int requested_size;
> -	struct drm_format_name_buf format_name;
>  	int ret;
>  
>  	requested_size = mode_cmd->height * mode_cmd->pitches[0];
> @@ -1236,8 +1233,8 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>  		case DRM_FORMAT_RGB565:
>  			break;
>  		default:
> -			DRM_ERROR("Invalid pixel format: %s\n",
> -				  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +			DRM_ERROR("Invalid pixel format: %p4cc\n",
> +				  &mode_cmd->pixel_format);
>  			return -EINVAL;
>  		}
>  	}
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 156b122c0ad5..3ea17b8a79d3 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -318,6 +318,5 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
>  					  int plane);
>  uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
>  				   int plane, unsigned int buffer_width);
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
>  
>  #endif /* __DRM_FOURCC_H__ */
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko


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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

Hi Andy,

On Mon, Feb 15, 2021 at 03:41:14PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 01:40:30PM +0200, Sakari Ailus wrote:
> > Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> > large number of temporary variables at the same time.
> 
> What a nice clean up!
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Thanks!

> after addressing nit-picks below.
> 
> Side note (no need to implement esp. right now): it seems often it's coupled
> with modifier, would be nice to have them together that %p4ccM or so can do it
> in one go.

...

> > diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> > index 03262472059c..5cf45aa6eedc 100644
> > --- a/drivers/gpu/drm/drm_fourcc.c
> > +++ b/drivers/gpu/drm/drm_fourcc.c
> > @@ -30,11 +30,6 @@
> >  #include <drm/drm_device.h>
> >  #include <drm/drm_fourcc.h>
> >  
> > -static char printable_char(int c)
> > -{
> > -	return isascii(c) && isprint(c) ? c : '?';
> > -}
> 
> If it goes as an ABI than your dot is incompatible with this and '?' should be
> used instead in the patch 1. And I bend towards suggested '?' rather than '.'.
> 
> Also it means that you probably would need different specifiers for full and
> short formats.

I thought of that, but then the resulting string would be indeed different
and comparing short and long formats would be harder. Remember this is for
debug prints. If the format is too long, then it should be made shorter,
but during the earlier review rounds people have expressed interest in
having this information there.

"?" can be expanded by the shell whereas "." is not. If DRM folks think we
should go back to "?" I'm fine with that. Also note that there's something
wrong with the fourcc code to begin with if it's got either "." or "?".

-- 
Regards,

Sakari Ailus

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

Hi Andy,

On Mon, Feb 15, 2021 at 03:41:14PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 15, 2021 at 01:40:30PM +0200, Sakari Ailus wrote:
> > Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> > large number of temporary variables at the same time.
> 
> What a nice clean up!
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Thanks!

> after addressing nit-picks below.
> 
> Side note (no need to implement esp. right now): it seems often it's coupled
> with modifier, would be nice to have them together that %p4ccM or so can do it
> in one go.

...

> > diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> > index 03262472059c..5cf45aa6eedc 100644
> > --- a/drivers/gpu/drm/drm_fourcc.c
> > +++ b/drivers/gpu/drm/drm_fourcc.c
> > @@ -30,11 +30,6 @@
> >  #include <drm/drm_device.h>
> >  #include <drm/drm_fourcc.h>
> >  
> > -static char printable_char(int c)
> > -{
> > -	return isascii(c) && isprint(c) ? c : '?';
> > -}
> 
> If it goes as an ABI than your dot is incompatible with this and '?' should be
> used instead in the patch 1. And I bend towards suggested '?' rather than '.'.
> 
> Also it means that you probably would need different specifiers for full and
> short formats.

I thought of that, but then the resulting string would be indeed different
and comparing short and long formats would be harder. Remember this is for
debug prints. If the format is too long, then it should be made shorter,
but during the earlier review rounds people have expressed interest in
having this information there.

"?" can be expanded by the shell whereas "." is not. If DRM folks think we
should go back to "?" I'm fine with that. Also note that there's something
wrong with the fourcc code to begin with if it's got either "." or "?".

-- 
Regards,

Sakari Ailus
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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

On Mon, Feb 15, 2021 at 03:41:14PM +0200, Andy Shevchenko wrote:
...
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> > index ca41e8c00ad7..a5c9fe2e56b3 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> > @@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
> >  	const struct intel_plane_state *plane_state =
> >  		to_intel_plane_state(plane->base.state);
> >  	const struct drm_framebuffer *fb = plane_state->uapi.fb;
> > -	struct drm_format_name_buf format_name;
> >  	struct drm_rect src, dst;
> >  	char rot_str[48];
> >  
> >  	src = drm_plane_state_src(&plane_state->uapi);
> >  	dst = drm_plane_state_dest(&plane_state->uapi);
> >  
> > -	if (fb)
> > -		drm_get_format_name(fb->format->format, &format_name);
> > -
> >  	plane_rotation(rot_str, sizeof(rot_str),
> >  		       plane_state->uapi.rotation);
> >  
> > -	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> > -		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
> > +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> > +	if (fb)
> > +		seq_printf(m, "%p4cc", &fb->format->format);
> > +	else
> > +		seq_puts(m, "n/a");
> 
> > +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> 
> Why not to keep two seq_printf() calls?
> 
> if (fb) {
> 	seq_printf();
> } else {
> 	seq_printf();
> }
> 
> ?

I could, but it'd repeat a lot of the same format string that is very
complicated right now. Therefore I thought it's better to split.

Or do you mean seq_printf() vs. seq_puts()? checkpatch.pl (rightly) warns
about it.

> 
> >  		   fb ? fb->modifier : 0,
> >  		   fb ? fb->width : 0, fb ? fb->height : 0,
> >  		   plane_visibility(plane_state),

-- 
Sakari Ailus

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

On Mon, Feb 15, 2021 at 03:41:14PM +0200, Andy Shevchenko wrote:
...
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> > index ca41e8c00ad7..a5c9fe2e56b3 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> > @@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
> >  	const struct intel_plane_state *plane_state =
> >  		to_intel_plane_state(plane->base.state);
> >  	const struct drm_framebuffer *fb = plane_state->uapi.fb;
> > -	struct drm_format_name_buf format_name;
> >  	struct drm_rect src, dst;
> >  	char rot_str[48];
> >  
> >  	src = drm_plane_state_src(&plane_state->uapi);
> >  	dst = drm_plane_state_dest(&plane_state->uapi);
> >  
> > -	if (fb)
> > -		drm_get_format_name(fb->format->format, &format_name);
> > -
> >  	plane_rotation(rot_str, sizeof(rot_str),
> >  		       plane_state->uapi.rotation);
> >  
> > -	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> > -		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
> > +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> > +	if (fb)
> > +		seq_printf(m, "%p4cc", &fb->format->format);
> > +	else
> > +		seq_puts(m, "n/a");
> 
> > +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> 
> Why not to keep two seq_printf() calls?
> 
> if (fb) {
> 	seq_printf();
> } else {
> 	seq_printf();
> }
> 
> ?

I could, but it'd repeat a lot of the same format string that is very
complicated right now. Therefore I thought it's better to split.

Or do you mean seq_printf() vs. seq_puts()? checkpatch.pl (rightly) warns
about it.

> 
> >  		   fb ? fb->modifier : 0,
> >  		   fb ? fb->width : 0, fb ? fb->height : 0,
> >  		   plane_visibility(plane_state),

-- 
Sakari Ailus
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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 07:26:55PM +0200, Sakari Ailus wrote:
> On Mon, Feb 15, 2021 at 03:41:14PM +0200, Andy Shevchenko wrote:
> ...
> > > +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> > > +	if (fb)
> > > +		seq_printf(m, "%p4cc", &fb->format->format);
> > > +	else
> > > +		seq_puts(m, "n/a");
> > 
> > > +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> > 
> > Why not to keep two seq_printf() calls?
> > 
> > if (fb) {
> > 	seq_printf();
> > } else {
> > 	seq_printf();
> > }
> > 
> > ?
> 
> I could, but it'd repeat a lot of the same format string that is very
> complicated right now. Therefore I thought it's better to split.

It's fine, why not?

> Or do you mean seq_printf() vs. seq_puts()? checkpatch.pl (rightly) warns
> about it.

If it doesn't take run-time parameters, then definitely
if (fb)
	seq_printf();
else
	seq_puts();

> > >  		   fb ? fb->modifier : 0,
> > >  		   fb ? fb->width : 0, fb ? fb->height : 0,
> > >  		   plane_visibility(plane_state),

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Andy Shevchenko]

On Mon, Feb 15, 2021 at 07:26:55PM +0200, Sakari Ailus wrote:
> On Mon, Feb 15, 2021 at 03:41:14PM +0200, Andy Shevchenko wrote:
> ...
> > > +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> > > +	if (fb)
> > > +		seq_printf(m, "%p4cc", &fb->format->format);
> > > +	else
> > > +		seq_puts(m, "n/a");
> > 
> > > +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> > 
> > Why not to keep two seq_printf() calls?
> > 
> > if (fb) {
> > 	seq_printf();
> > } else {
> > 	seq_printf();
> > }
> > 
> > ?
> 
> I could, but it'd repeat a lot of the same format string that is very
> complicated right now. Therefore I thought it's better to split.

It's fine, why not?

> Or do you mean seq_printf() vs. seq_puts()? checkpatch.pl (rightly) warns
> about it.

If it doesn't take run-time parameters, then definitely
if (fb)
	seq_printf();
else
	seq_puts();

> > >  		   fb ? fb->modifier : 0,
> > >  		   fb ? fb->width : 0, fb ? fb->height : 0,
> > >  		   plane_visibility(plane_state),

-- 
With Best Regards,
Andy Shevchenko


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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Petr Mladek]

On Mon 2021-02-15 13:40:30, Sakari Ailus wrote:
> Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> large number of temporary variables at the same time.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

Reviewed-by: Petr Mladek <pmladek@suse.com>

I wonder if I could this via printk tree. Or if should rather go
via DRM tree.

Anyway, there will be v8 with small changes in the 1st patch.

Best Regards,
Petr

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Petr Mladek]

On Mon 2021-02-15 13:40:30, Sakari Ailus wrote:
> Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> large number of temporary variables at the same time.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

Reviewed-by: Petr Mladek <pmladek@suse.com>

I wonder if I could this via printk tree. Or if should rather go
via DRM tree.

Anyway, there will be v8 with small changes in the 1st patch.

Best Regards,
Petr
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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Thomas Zimmermann]

[-- Attachment #1.1: Type: text/plain, Size: 33367 bytes --]

Hi

Am 15.02.21 um 12:40 schrieb Sakari Ailus:
> Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> large number of temporary variables at the same time.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
>   drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
>   drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
>   drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
>   .../arm/display/komeda/komeda_format_caps.h   | 11 --------
>   .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
>   .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
>   drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
>   drivers/gpu/drm/drm_atomic.c                  |  8 ++----
>   drivers/gpu/drm/drm_crtc.c                    |  7 ++----
>   drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
>   drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
>   drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
>   drivers/gpu/drm/drm_plane.c                   |  8 ++----
>   .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
>   drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
>   .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
>   drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
>   drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
>   drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
>   drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
>   drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
>   drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
>   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
>   include/drm/drm_fourcc.h                      |  1 -
>   27 files changed, 64 insertions(+), 157 deletions(-)

This is a nice patchset. For the driver-related changes:

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

But landing this patch will certainly give us build errors. There are at 
least 3 git trees involved: drm-misc-next, amd and i915. I'd expect at 
least one of them to have additional changes that still require 
drm_get_format_name().

IMHO we should remove drm_get_format_name() in a later patch. Please 
remove the changes in drm_fourcc.{c,h} from this patch and maybe add a 
TODO comment to the declaration that the function is supposed to be removed.

I would merge the patchset through drm-misc-next. And the final removal 
patch during the next cycle. Ok?

Best regard
Thomas

> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> index 7944781e1086..ea825b4f8ee8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> @@ -1862,7 +1862,6 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 tmp, viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1981,8 +1980,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> index 1b6ff0470011..a360a6dec198 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> @@ -1904,7 +1904,6 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 tmp, viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -2023,8 +2022,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> index 83a88385b762..ef124ac853b6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> @@ -1820,7 +1820,6 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1929,8 +1928,8 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> index 224b30214427..c98650183828 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> @@ -1791,7 +1791,6 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1902,8 +1901,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index c6da89df055d..fcef3bf14952 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4465,7 +4465,6 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>   	const struct drm_framebuffer *fb = plane_state->fb;
>   	const struct amdgpu_framebuffer *afb =
>   		to_amdgpu_framebuffer(plane_state->fb);
> -	struct drm_format_name_buf format_name;
>   	int ret;
>   
>   	memset(plane_info, 0, sizeof(*plane_info));
> @@ -4513,8 +4512,8 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>   		break;
>   	default:
>   		DRM_ERROR(
> -			"Unsupported screen format %s\n",
> -			drm_get_format_name(fb->format->format, &format_name));
> +			"Unsupported screen format %p4cc\n",
> +			&fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> index 32273cf18f7c..cf7a183f773d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> @@ -82,17 +82,6 @@ struct komeda_format_caps_table {
>   
>   extern u64 komeda_supported_modifiers[];
>   
> -static inline const char *komeda_get_format_name(u32 fourcc, u64 modifier)
> -{
> -	struct drm_format_name_buf buf;
> -	static char name[64];
> -
> -	snprintf(name, sizeof(name), "%s with modifier: 0x%llx.",
> -		 drm_get_format_name(fourcc, &buf), modifier);
> -
> -	return name;
> -}
> -
>   const struct komeda_format_caps *
>   komeda_get_format_caps(struct komeda_format_caps_table *table,
>   		       u32 fourcc, u64 modifier);
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> index 170f9dc8ec19..3c372d2deb0a 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> @@ -276,8 +276,8 @@ bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
>   	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
>   						fourcc, modifier, rot);
>   	if (!supported)
> -		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
> -			layer_type, komeda_get_format_name(fourcc, modifier));
> +		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %p4cc with modifier: 0x%llx.\n",
> +				 layer_type, &fourcc, modifier);
>   
>   	return supported;
>   }
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> index 98e915e325dd..2d5066ea270c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> @@ -49,10 +49,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
>   
>   	dflow->rot = drm_rotation_simplify(st->rotation, caps->supported_rots);
>   	if (!has_bits(dflow->rot, caps->supported_rots)) {
> -		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %s.\n",
> -				 dflow->rot,
> -				 komeda_get_format_name(caps->fourcc,
> -							fb->modifier));
> +		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %p4cc with modifier: 0x%llx.\n",
> +				 dflow->rot, &caps->fourcc, fb->modifier);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
> index 7d0e7b031e44..f5847a79dd7e 100644
> --- a/drivers/gpu/drm/arm/malidp_mw.c
> +++ b/drivers/gpu/drm/arm/malidp_mw.c
> @@ -151,11 +151,8 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
>   		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
>   					fb->format->format, !!fb->modifier);
>   	if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index dda60051854b..ce2ee6b8bf34 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -578,13 +578,9 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
>   	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>   					   fb->modifier);
>   	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
> +		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
>   				 plane->base.id, plane->name,
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name),
> -				 fb->modifier);
> +				 &fb->format->format, fb->modifier);
>   		return ret;
>   	}
>   
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 74090fc3aa55..9ba2d3640b47 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -663,11 +663,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
>   							   fb->format->format,
>   							   fb->modifier);
>   			if (ret) {
> -				struct drm_format_name_buf format_name;
> -
> -				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -					      drm_get_format_name(fb->format->format,
> -								  &format_name),
> +				DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +					      &fb->format->format,
>   					      fb->modifier);
>   				goto out;
>   			}
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 03262472059c..5cf45aa6eedc 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -30,11 +30,6 @@
>   #include <drm/drm_device.h>
>   #include <drm/drm_fourcc.h>
>   
> -static char printable_char(int c)
> -{
> -	return isascii(c) && isprint(c) ? c : '?';
> -}
> -
>   /**
>    * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
>    * @bpp: bits per pixels
> @@ -130,26 +125,6 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
>   }
>   EXPORT_SYMBOL(drm_driver_legacy_fb_format);
>   
> -/**
> - * drm_get_format_name - fill a string with a drm fourcc format's name
> - * @format: format to compute name of
> - * @buf: caller-supplied buffer
> - */
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
> -{
> -	snprintf(buf->str, sizeof(buf->str),
> -		 "%c%c%c%c %s-endian (0x%08x)",
> -		 printable_char(format & 0xff),
> -		 printable_char((format >> 8) & 0xff),
> -		 printable_char((format >> 16) & 0xff),
> -		 printable_char((format >> 24) & 0x7f),
> -		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
> -		 format);
> -
> -	return buf->str;
> -}
> -EXPORT_SYMBOL(drm_get_format_name);
> -
>   /*
>    * Internal function to query information for a given format. See
>    * drm_format_info() for the public API.
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index aca62ed51e82..4d01464b6f95 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -177,11 +177,8 @@ static int framebuffer_check(struct drm_device *dev,
>   
>   	/* check if the format is supported at all */
>   	if (!__drm_format_info(r->pixel_format)) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("bad framebuffer format %s\n",
> -			      drm_get_format_name(r->pixel_format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("bad framebuffer format %p4cc\n",
> +			      &r->pixel_format);
>   		return -EINVAL;
>   	}
>   
> @@ -1160,14 +1157,12 @@ EXPORT_SYMBOL(drm_framebuffer_plane_height);
>   void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
>   				const struct drm_framebuffer *fb)
>   {
> -	struct drm_format_name_buf format_name;
>   	unsigned int i;
>   
>   	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
>   	drm_printf_indent(p, indent, "refcount=%u\n",
>   			  drm_framebuffer_read_refcount(fb));
> -	drm_printf_indent(p, indent, "format=%s\n",
> -			  drm_get_format_name(fb->format->format, &format_name));
> +	drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
>   	drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
>   	drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
>   	drm_printf_indent(p, indent, "layers:\n");
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 230c4fd7131c..43a9b739bba7 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -203,7 +203,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>   	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
>   	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(gem);
>   	struct dma_buf_attachment *import_attach = gem->import_attach;
> -	struct drm_format_name_buf format_name;
>   	void *src = cma_obj->vaddr;
>   	int ret = 0;
>   
> @@ -225,8 +224,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>   		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
>   		break;
>   	default:
> -		drm_err_once(fb->dev, "Format is not supported: %s\n",
> -			     drm_get_format_name(fb->format->format, &format_name));
> +		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
> +			     &fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index a0cb746bcb0a..4d8429917d7d 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -623,12 +623,8 @@ static int __setplane_check(struct drm_plane *plane,
>   	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>   					   fb->modifier);
>   	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name),
> -			      fb->modifier);
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +			      &fb->format->format, fb->modifier);
>   		return ret;
>   	}
>   
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> index aa6c53f88f7c..70aa6c8844c0 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> @@ -549,16 +549,15 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
>   			 u32 ch, u32 y, u32 in_h, u32 fmt)
>   {
>   	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
> -	struct drm_format_name_buf format_name;
>   	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
>   	u32 stride = fb->pitches[0];
>   	u32 addr = (u32)obj->paddr + y * stride;
>   
>   	DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
>   			 ch + 1, y, in_h, stride, (u32)obj->paddr);
> -	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
> +	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%p4cc)\n",
>   			 addr, fb->width, fb->height, fmt,
> -			 drm_get_format_name(fb->format->format, &format_name));
> +			 &fb->format->format);
>   
>   	/* get reg offset */
>   	reg_ctrl = RD_CH_CTRL(ch);
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 53a00cf3fa32..7981627390a0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13319,7 +13319,6 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>   	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
>   	struct drm_i915_private *i915 = to_i915(plane->base.dev);
>   	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>   
>   	if (!fb) {
>   		drm_dbg_kms(&i915->drm,
> @@ -13330,10 +13329,9 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>   	}
>   
>   	drm_dbg_kms(&i915->drm,
> -		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s modifier = 0x%llx, visible: %s\n",
> +		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
>   		    plane->base.base.id, plane->base.name,
> -		    fb->base.id, fb->width, fb->height,
> -		    drm_get_format_name(fb->format->format, &format_name),
> +		    fb->base.id, fb->width, fb->height, &fb->format->format,
>   		    fb->modifier, yesno(plane_state->uapi.visible));
>   	drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
>   		    plane_state->hw.rotation, plane_state->scaler_id);
> @@ -17927,13 +17925,9 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
>   	if (!drm_any_plane_has_format(&dev_priv->drm,
>   				      mode_cmd->pixel_format,
>   				      mode_cmd->modifier[0])) {
> -		struct drm_format_name_buf format_name;
> -
>   		drm_dbg_kms(&dev_priv->drm,
> -			    "unsupported pixel format %s / modifier 0x%llx\n",
> -			    drm_get_format_name(mode_cmd->pixel_format,
> -						&format_name),
> -			    mode_cmd->modifier[0]);
> +			    "unsupported pixel format %p4cc / modifier 0x%llx\n",
> +			    &mode_cmd->pixel_format, mode_cmd->modifier[0]);
>   		goto err;
>   	}
>   
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index ca41e8c00ad7..a5c9fe2e56b3 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
>   	const struct intel_plane_state *plane_state =
>   		to_intel_plane_state(plane->base.state);
>   	const struct drm_framebuffer *fb = plane_state->uapi.fb;
> -	struct drm_format_name_buf format_name;
>   	struct drm_rect src, dst;
>   	char rot_str[48];
>   
>   	src = drm_plane_state_src(&plane_state->uapi);
>   	dst = drm_plane_state_dest(&plane_state->uapi);
>   
> -	if (fb)
> -		drm_get_format_name(fb->format->format, &format_name);
> -
>   	plane_rotation(rot_str, sizeof(rot_str),
>   		       plane_state->uapi.rotation);
>   
> -	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
> +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> +	if (fb)
> +		seq_printf(m, "%p4cc", &fb->format->format);
> +	else
> +		seq_puts(m, "n/a");
> +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
>   		   fb ? fb->modifier : 0,
>   		   fb ? fb->width : 0, fb ? fb->height : 0,
>   		   plane_visibility(plane_state),
> @@ -804,19 +804,16 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
>   	const struct intel_plane_state *plane_state =
>   		to_intel_plane_state(plane->base.state);
>   	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>   	char rot_str[48];
>   
>   	if (!fb)
>   		return;
>   
> -	drm_get_format_name(fb->format->format, &format_name);
> -
>   	plane_rotation(rot_str, sizeof(rot_str),
>   		       plane_state->hw.rotation);
>   
> -	seq_printf(m, "\t\thw: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb->base.id, format_name.str,
> +	seq_printf(m, "\t\thw: [FB:%d] %p4cc,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> +		   fb->base.id, &fb->format->format,
>   		   fb->modifier, fb->width, fb->height,
>   		   yesno(plane_state->uapi.visible),
>   		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 019a2d6d807a..e4e55d1aec10 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -2285,7 +2285,6 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>   	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
>   	const struct drm_framebuffer *fb = plane_state->hw.fb;
>   	unsigned int rotation = plane_state->hw.rotation;
> -	struct drm_format_name_buf format_name;
>   
>   	if (!fb)
>   		return 0;
> @@ -2333,9 +2332,8 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>   		case DRM_FORMAT_XVYU12_16161616:
>   		case DRM_FORMAT_XVYU16161616:
>   			drm_dbg_kms(&dev_priv->drm,
> -				    "Unsupported pixel format %s for 90/270!\n",
> -				    drm_get_format_name(fb->format->format,
> -							&format_name));
> +				    "Unsupported pixel format %p4cc for 90/270!\n",
> +				    &fb->format->format);
>   			return -EINVAL;
>   		default:
>   			break;
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index 7c2e0b865441..83ac7493e751 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -1161,7 +1161,6 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>   	int dsi_pkt_size;
>   	int fifo_wtrmrk;
>   	int cpp = fb->format->cpp[0];
> -	struct drm_format_name_buf tmp;
>   	u32 dsi_formatter_frame;
>   	u32 val;
>   	int ret;
> @@ -1173,9 +1172,8 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>   		return;
>   	}
>   
> -	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
> -		 mode->hdisplay, mode->vdisplay,
> -		 drm_get_format_name(format, &tmp));
> +	dev_info(drm->dev, "enable MCDE, %d x %d format %p4cc\n",
> +		 mode->hdisplay, mode->vdisplay, &format);
>   
>   
>   	/* Clear any pending interrupts */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 56eb22554197..ea9d73983d13 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -71,7 +71,6 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>   {
>   	struct dpu_hw_mixer *lm = mixer->hw_lm;
>   	uint32_t blend_op;
> -	struct drm_format_name_buf format_name;
>   
>   	/* default to opaque blending */
>   	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
> @@ -87,9 +86,8 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>   	lm->ops.setup_blend_config(lm, pstate->stage,
>   				0xFF, 0, blend_op);
>   
> -	DPU_DEBUG("format:%s, alpha_en:%u blend_op:0x%x\n",
> -		drm_get_format_name(format->base.pixel_format, &format_name),
> -		format->alpha_enable, blend_op);
> +	DPU_DEBUG("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
> +		  &format->base.pixel_format, format->alpha_enable, blend_op);
>   }
>   
>   static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index bceb48a2dfca..a305b749c321 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -322,12 +322,9 @@ nouveau_framebuffer_new(struct drm_device *dev,
>   	     mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
>   	     (mode_cmd->pitches[1] && /* pitches for planes must match */
>   	      mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
> -		struct drm_format_name_buf format_name;
> -		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n",
> -			      drm_get_format_name(mode_cmd->pixel_format,
> -						  &format_name),
> -			      mode_cmd->pitches[0],
> -			      mode_cmd->pitches[1]);
> +		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
> +			      &mode_cmd->pixel_format,
> +			      mode_cmd->pitches[0], mode_cmd->pitches[1]);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
> index 1979ed3d6547..c94e429e75f9 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -1157,7 +1157,6 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 tmp, viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1267,8 +1266,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> @@ -1478,7 +1477,6 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1579,8 +1577,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index 522e51a404cc..bf8cfefa0365 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -510,7 +510,6 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>   		struct sun4i_layer_state *layer_state =
>   			state_to_sun4i_layer_state(plane_state);
>   		struct drm_framebuffer *fb = plane_state->fb;
> -		struct drm_format_name_buf format_name;
>   
>   		if (!sun4i_backend_plane_is_supported(plane_state,
>   						      &layer_state->uses_frontend))
> @@ -527,9 +526,8 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>   			}
>   		}
>   
> -		DRM_DEBUG_DRIVER("Plane FB format is %s\n",
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name));
> +		DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
> +				 &fb->format->format);
>   		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
>   			num_alpha_planes++;
>   
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> index 78fdc1d59186..0935686475a0 100644
> --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -42,11 +42,8 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
>   	}
>   
>   	if (fb->format->format != vkms_wb_formats[0]) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index bc67f2b930e1..0cd2c55036bb 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -895,7 +895,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>   	struct vmw_framebuffer_surface *vfbs;
>   	enum SVGA3dSurfaceFormat format;
>   	int ret;
> -	struct drm_format_name_buf format_name;
>   
>   	/* 3D is only supported on HWv8 and newer hosts */
>   	if (dev_priv->active_display_unit == vmw_du_legacy)
> @@ -933,8 +932,8 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>   		format = SVGA3D_A1R5G5B5;
>   		break;
>   	default:
> -		DRM_ERROR("Invalid pixel format: %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid pixel format: %p4cc\n",
> +			  &mode_cmd->pixel_format);
>   		return -EINVAL;
>   	}
>   
> @@ -1149,7 +1148,6 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>   	uint32_t format;
>   	struct vmw_resource *res;
>   	unsigned int bytes_pp;
> -	struct drm_format_name_buf format_name;
>   	int ret;
>   
>   	switch (mode_cmd->pixel_format) {
> @@ -1171,8 +1169,8 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>   		break;
>   
>   	default:
> -		DRM_ERROR("Invalid framebuffer format %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid framebuffer format %p4cc\n",
> +			  &mode_cmd->pixel_format);
>   		return -EINVAL;
>   	}
>   
> @@ -1216,7 +1214,6 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>   	struct drm_device *dev = dev_priv->dev;
>   	struct vmw_framebuffer_bo *vfbd;
>   	unsigned int requested_size;
> -	struct drm_format_name_buf format_name;
>   	int ret;
>   
>   	requested_size = mode_cmd->height * mode_cmd->pitches[0];
> @@ -1236,8 +1233,8 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>   		case DRM_FORMAT_RGB565:
>   			break;
>   		default:
> -			DRM_ERROR("Invalid pixel format: %s\n",
> -				  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +			DRM_ERROR("Invalid pixel format: %p4cc\n",
> +				  &mode_cmd->pixel_format);
>   			return -EINVAL;
>   		}
>   	}
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 156b122c0ad5..3ea17b8a79d3 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -318,6 +318,5 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
>   					  int plane);
>   uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
>   				   int plane, unsigned int buffer_width);
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
>   
>   #endif /* __DRM_FOURCC_H__ */
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


[-- Attachment #2: OpenPGP digital signature --]
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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Thomas Zimmermann]

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Hi

Am 15.02.21 um 12:40 schrieb Sakari Ailus:
> Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> large number of temporary variables at the same time.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
>   drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
>   drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
>   drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
>   .../arm/display/komeda/komeda_format_caps.h   | 11 --------
>   .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
>   .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
>   drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
>   drivers/gpu/drm/drm_atomic.c                  |  8 ++----
>   drivers/gpu/drm/drm_crtc.c                    |  7 ++----
>   drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
>   drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
>   drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
>   drivers/gpu/drm/drm_plane.c                   |  8 ++----
>   .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
>   drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
>   .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
>   drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
>   drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
>   drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
>   drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
>   drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
>   drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
>   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
>   include/drm/drm_fourcc.h                      |  1 -
>   27 files changed, 64 insertions(+), 157 deletions(-)

This is a nice patchset. For the driver-related changes:

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

But landing this patch will certainly give us build errors. There are at 
least 3 git trees involved: drm-misc-next, amd and i915. I'd expect at 
least one of them to have additional changes that still require 
drm_get_format_name().

IMHO we should remove drm_get_format_name() in a later patch. Please 
remove the changes in drm_fourcc.{c,h} from this patch and maybe add a 
TODO comment to the declaration that the function is supposed to be removed.

I would merge the patchset through drm-misc-next. And the final removal 
patch during the next cycle. Ok?

Best regard
Thomas

> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> index 7944781e1086..ea825b4f8ee8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> @@ -1862,7 +1862,6 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 tmp, viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1981,8 +1980,8 @@ static int dce_v10_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> index 1b6ff0470011..a360a6dec198 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> @@ -1904,7 +1904,6 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 tmp, viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -2023,8 +2022,8 @@ static int dce_v11_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> index 83a88385b762..ef124ac853b6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
> @@ -1820,7 +1820,6 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1929,8 +1928,8 @@ static int dce_v6_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> index 224b30214427..c98650183828 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> @@ -1791,7 +1791,6 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1902,8 +1901,8 @@ static int dce_v8_0_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index c6da89df055d..fcef3bf14952 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4465,7 +4465,6 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>   	const struct drm_framebuffer *fb = plane_state->fb;
>   	const struct amdgpu_framebuffer *afb =
>   		to_amdgpu_framebuffer(plane_state->fb);
> -	struct drm_format_name_buf format_name;
>   	int ret;
>   
>   	memset(plane_info, 0, sizeof(*plane_info));
> @@ -4513,8 +4512,8 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
>   		break;
>   	default:
>   		DRM_ERROR(
> -			"Unsupported screen format %s\n",
> -			drm_get_format_name(fb->format->format, &format_name));
> +			"Unsupported screen format %p4cc\n",
> +			&fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> index 32273cf18f7c..cf7a183f773d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
> @@ -82,17 +82,6 @@ struct komeda_format_caps_table {
>   
>   extern u64 komeda_supported_modifiers[];
>   
> -static inline const char *komeda_get_format_name(u32 fourcc, u64 modifier)
> -{
> -	struct drm_format_name_buf buf;
> -	static char name[64];
> -
> -	snprintf(name, sizeof(name), "%s with modifier: 0x%llx.",
> -		 drm_get_format_name(fourcc, &buf), modifier);
> -
> -	return name;
> -}
> -
>   const struct komeda_format_caps *
>   komeda_get_format_caps(struct komeda_format_caps_table *table,
>   		       u32 fourcc, u64 modifier);
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> index 170f9dc8ec19..3c372d2deb0a 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> @@ -276,8 +276,8 @@ bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
>   	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
>   						fourcc, modifier, rot);
>   	if (!supported)
> -		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
> -			layer_type, komeda_get_format_name(fourcc, modifier));
> +		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %p4cc with modifier: 0x%llx.\n",
> +				 layer_type, &fourcc, modifier);
>   
>   	return supported;
>   }
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> index 98e915e325dd..2d5066ea270c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
> @@ -49,10 +49,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
>   
>   	dflow->rot = drm_rotation_simplify(st->rotation, caps->supported_rots);
>   	if (!has_bits(dflow->rot, caps->supported_rots)) {
> -		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %s.\n",
> -				 dflow->rot,
> -				 komeda_get_format_name(caps->fourcc,
> -							fb->modifier));
> +		DRM_DEBUG_ATOMIC("rotation(0x%x) isn't supported by %p4cc with modifier: 0x%llx.\n",
> +				 dflow->rot, &caps->fourcc, fb->modifier);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
> index 7d0e7b031e44..f5847a79dd7e 100644
> --- a/drivers/gpu/drm/arm/malidp_mw.c
> +++ b/drivers/gpu/drm/arm/malidp_mw.c
> @@ -151,11 +151,8 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
>   		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
>   					fb->format->format, !!fb->modifier);
>   	if (mw_state->format == MALIDP_INVALID_FORMAT_ID) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index dda60051854b..ce2ee6b8bf34 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -578,13 +578,9 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
>   	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>   					   fb->modifier);
>   	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
> +		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
>   				 plane->base.id, plane->name,
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name),
> -				 fb->modifier);
> +				 &fb->format->format, fb->modifier);
>   		return ret;
>   	}
>   
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 74090fc3aa55..9ba2d3640b47 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -663,11 +663,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
>   							   fb->format->format,
>   							   fb->modifier);
>   			if (ret) {
> -				struct drm_format_name_buf format_name;
> -
> -				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -					      drm_get_format_name(fb->format->format,
> -								  &format_name),
> +				DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +					      &fb->format->format,
>   					      fb->modifier);
>   				goto out;
>   			}
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 03262472059c..5cf45aa6eedc 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -30,11 +30,6 @@
>   #include <drm/drm_device.h>
>   #include <drm/drm_fourcc.h>
>   
> -static char printable_char(int c)
> -{
> -	return isascii(c) && isprint(c) ? c : '?';
> -}
> -
>   /**
>    * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
>    * @bpp: bits per pixels
> @@ -130,26 +125,6 @@ uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
>   }
>   EXPORT_SYMBOL(drm_driver_legacy_fb_format);
>   
> -/**
> - * drm_get_format_name - fill a string with a drm fourcc format's name
> - * @format: format to compute name of
> - * @buf: caller-supplied buffer
> - */
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
> -{
> -	snprintf(buf->str, sizeof(buf->str),
> -		 "%c%c%c%c %s-endian (0x%08x)",
> -		 printable_char(format & 0xff),
> -		 printable_char((format >> 8) & 0xff),
> -		 printable_char((format >> 16) & 0xff),
> -		 printable_char((format >> 24) & 0x7f),
> -		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
> -		 format);
> -
> -	return buf->str;
> -}
> -EXPORT_SYMBOL(drm_get_format_name);
> -
>   /*
>    * Internal function to query information for a given format. See
>    * drm_format_info() for the public API.
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index aca62ed51e82..4d01464b6f95 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -177,11 +177,8 @@ static int framebuffer_check(struct drm_device *dev,
>   
>   	/* check if the format is supported at all */
>   	if (!__drm_format_info(r->pixel_format)) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("bad framebuffer format %s\n",
> -			      drm_get_format_name(r->pixel_format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("bad framebuffer format %p4cc\n",
> +			      &r->pixel_format);
>   		return -EINVAL;
>   	}
>   
> @@ -1160,14 +1157,12 @@ EXPORT_SYMBOL(drm_framebuffer_plane_height);
>   void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
>   				const struct drm_framebuffer *fb)
>   {
> -	struct drm_format_name_buf format_name;
>   	unsigned int i;
>   
>   	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
>   	drm_printf_indent(p, indent, "refcount=%u\n",
>   			  drm_framebuffer_read_refcount(fb));
> -	drm_printf_indent(p, indent, "format=%s\n",
> -			  drm_get_format_name(fb->format->format, &format_name));
> +	drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
>   	drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
>   	drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
>   	drm_printf_indent(p, indent, "layers:\n");
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 230c4fd7131c..43a9b739bba7 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -203,7 +203,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>   	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
>   	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(gem);
>   	struct dma_buf_attachment *import_attach = gem->import_attach;
> -	struct drm_format_name_buf format_name;
>   	void *src = cma_obj->vaddr;
>   	int ret = 0;
>   
> @@ -225,8 +224,8 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>   		drm_fb_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
>   		break;
>   	default:
> -		drm_err_once(fb->dev, "Format is not supported: %s\n",
> -			     drm_get_format_name(fb->format->format, &format_name));
> +		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
> +			     &fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index a0cb746bcb0a..4d8429917d7d 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -623,12 +623,8 @@ static int __setplane_check(struct drm_plane *plane,
>   	ret = drm_plane_check_pixel_format(plane, fb->format->format,
>   					   fb->modifier);
>   	if (ret) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name),
> -			      fb->modifier);
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
> +			      &fb->format->format, fb->modifier);
>   		return ret;
>   	}
>   
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> index aa6c53f88f7c..70aa6c8844c0 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> @@ -549,16 +549,15 @@ static void ade_rdma_set(void __iomem *base, struct drm_framebuffer *fb,
>   			 u32 ch, u32 y, u32 in_h, u32 fmt)
>   {
>   	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
> -	struct drm_format_name_buf format_name;
>   	u32 reg_ctrl, reg_addr, reg_size, reg_stride, reg_space, reg_en;
>   	u32 stride = fb->pitches[0];
>   	u32 addr = (u32)obj->paddr + y * stride;
>   
>   	DRM_DEBUG_DRIVER("rdma%d: (y=%d, height=%d), stride=%d, paddr=0x%x\n",
>   			 ch + 1, y, in_h, stride, (u32)obj->paddr);
> -	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%s)\n",
> +	DRM_DEBUG_DRIVER("addr=0x%x, fb:%dx%d, pixel_format=%d(%p4cc)\n",
>   			 addr, fb->width, fb->height, fmt,
> -			 drm_get_format_name(fb->format->format, &format_name));
> +			 &fb->format->format);
>   
>   	/* get reg offset */
>   	reg_ctrl = RD_CH_CTRL(ch);
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 53a00cf3fa32..7981627390a0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13319,7 +13319,6 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>   	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
>   	struct drm_i915_private *i915 = to_i915(plane->base.dev);
>   	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>   
>   	if (!fb) {
>   		drm_dbg_kms(&i915->drm,
> @@ -13330,10 +13329,9 @@ static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
>   	}
>   
>   	drm_dbg_kms(&i915->drm,
> -		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s modifier = 0x%llx, visible: %s\n",
> +		    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
>   		    plane->base.base.id, plane->base.name,
> -		    fb->base.id, fb->width, fb->height,
> -		    drm_get_format_name(fb->format->format, &format_name),
> +		    fb->base.id, fb->width, fb->height, &fb->format->format,
>   		    fb->modifier, yesno(plane_state->uapi.visible));
>   	drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
>   		    plane_state->hw.rotation, plane_state->scaler_id);
> @@ -17927,13 +17925,9 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
>   	if (!drm_any_plane_has_format(&dev_priv->drm,
>   				      mode_cmd->pixel_format,
>   				      mode_cmd->modifier[0])) {
> -		struct drm_format_name_buf format_name;
> -
>   		drm_dbg_kms(&dev_priv->drm,
> -			    "unsupported pixel format %s / modifier 0x%llx\n",
> -			    drm_get_format_name(mode_cmd->pixel_format,
> -						&format_name),
> -			    mode_cmd->modifier[0]);
> +			    "unsupported pixel format %p4cc / modifier 0x%llx\n",
> +			    &mode_cmd->pixel_format, mode_cmd->modifier[0]);
>   		goto err;
>   	}
>   
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index ca41e8c00ad7..a5c9fe2e56b3 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -771,21 +771,21 @@ static void intel_plane_uapi_info(struct seq_file *m, struct intel_plane *plane)
>   	const struct intel_plane_state *plane_state =
>   		to_intel_plane_state(plane->base.state);
>   	const struct drm_framebuffer *fb = plane_state->uapi.fb;
> -	struct drm_format_name_buf format_name;
>   	struct drm_rect src, dst;
>   	char rot_str[48];
>   
>   	src = drm_plane_state_src(&plane_state->uapi);
>   	dst = drm_plane_state_dest(&plane_state->uapi);
>   
> -	if (fb)
> -		drm_get_format_name(fb->format->format, &format_name);
> -
>   	plane_rotation(rot_str, sizeof(rot_str),
>   		       plane_state->uapi.rotation);
>   
> -	seq_printf(m, "\t\tuapi: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
> +	seq_printf(m, "\t\tuapi: [FB:%d] ", fb ? fb->base.id : 0);
> +	if (fb)
> +		seq_printf(m, "%p4cc", &fb->format->format);
> +	else
> +		seq_puts(m, "n/a");
> +	seq_printf(m, ",0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
>   		   fb ? fb->modifier : 0,
>   		   fb ? fb->width : 0, fb ? fb->height : 0,
>   		   plane_visibility(plane_state),
> @@ -804,19 +804,16 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
>   	const struct intel_plane_state *plane_state =
>   		to_intel_plane_state(plane->base.state);
>   	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	struct drm_format_name_buf format_name;
>   	char rot_str[48];
>   
>   	if (!fb)
>   		return;
>   
> -	drm_get_format_name(fb->format->format, &format_name);
> -
>   	plane_rotation(rot_str, sizeof(rot_str),
>   		       plane_state->hw.rotation);
>   
> -	seq_printf(m, "\t\thw: [FB:%d] %s,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> -		   fb->base.id, format_name.str,
> +	seq_printf(m, "\t\thw: [FB:%d] %p4cc,0x%llx,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
> +		   fb->base.id, &fb->format->format,
>   		   fb->modifier, fb->width, fb->height,
>   		   yesno(plane_state->uapi.visible),
>   		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 019a2d6d807a..e4e55d1aec10 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -2285,7 +2285,6 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>   	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
>   	const struct drm_framebuffer *fb = plane_state->hw.fb;
>   	unsigned int rotation = plane_state->hw.rotation;
> -	struct drm_format_name_buf format_name;
>   
>   	if (!fb)
>   		return 0;
> @@ -2333,9 +2332,8 @@ static int skl_plane_check_fb(const struct intel_crtc_state *crtc_state,
>   		case DRM_FORMAT_XVYU12_16161616:
>   		case DRM_FORMAT_XVYU16161616:
>   			drm_dbg_kms(&dev_priv->drm,
> -				    "Unsupported pixel format %s for 90/270!\n",
> -				    drm_get_format_name(fb->format->format,
> -							&format_name));
> +				    "Unsupported pixel format %p4cc for 90/270!\n",
> +				    &fb->format->format);
>   			return -EINVAL;
>   		default:
>   			break;
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index 7c2e0b865441..83ac7493e751 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -1161,7 +1161,6 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>   	int dsi_pkt_size;
>   	int fifo_wtrmrk;
>   	int cpp = fb->format->cpp[0];
> -	struct drm_format_name_buf tmp;
>   	u32 dsi_formatter_frame;
>   	u32 val;
>   	int ret;
> @@ -1173,9 +1172,8 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>   		return;
>   	}
>   
> -	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
> -		 mode->hdisplay, mode->vdisplay,
> -		 drm_get_format_name(format, &tmp));
> +	dev_info(drm->dev, "enable MCDE, %d x %d format %p4cc\n",
> +		 mode->hdisplay, mode->vdisplay, &format);
>   
>   
>   	/* Clear any pending interrupts */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 56eb22554197..ea9d73983d13 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -71,7 +71,6 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>   {
>   	struct dpu_hw_mixer *lm = mixer->hw_lm;
>   	uint32_t blend_op;
> -	struct drm_format_name_buf format_name;
>   
>   	/* default to opaque blending */
>   	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
> @@ -87,9 +86,8 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
>   	lm->ops.setup_blend_config(lm, pstate->stage,
>   				0xFF, 0, blend_op);
>   
> -	DPU_DEBUG("format:%s, alpha_en:%u blend_op:0x%x\n",
> -		drm_get_format_name(format->base.pixel_format, &format_name),
> -		format->alpha_enable, blend_op);
> +	DPU_DEBUG("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
> +		  &format->base.pixel_format, format->alpha_enable, blend_op);
>   }
>   
>   static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index bceb48a2dfca..a305b749c321 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -322,12 +322,9 @@ nouveau_framebuffer_new(struct drm_device *dev,
>   	     mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
>   	     (mode_cmd->pitches[1] && /* pitches for planes must match */
>   	      mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
> -		struct drm_format_name_buf format_name;
> -		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n",
> -			      drm_get_format_name(mode_cmd->pixel_format,
> -						  &format_name),
> -			      mode_cmd->pitches[0],
> -			      mode_cmd->pitches[1]);
> +		DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
> +			      &mode_cmd->pixel_format,
> +			      mode_cmd->pitches[0], mode_cmd->pitches[1]);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
> index 1979ed3d6547..c94e429e75f9 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -1157,7 +1157,6 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 tmp, viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1267,8 +1266,8 @@ static int dce4_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> @@ -1478,7 +1477,6 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>   	u32 viewport_w, viewport_h;
>   	int r;
>   	bool bypass_lut = false;
> -	struct drm_format_name_buf format_name;
>   
>   	/* no fb bound */
>   	if (!atomic && !crtc->primary->fb) {
> @@ -1579,8 +1577,8 @@ static int avivo_crtc_do_set_base(struct drm_crtc *crtc,
>   #endif
>   		break;
>   	default:
> -		DRM_ERROR("Unsupported screen format %s\n",
> -		          drm_get_format_name(target_fb->format->format, &format_name));
> +		DRM_ERROR("Unsupported screen format %p4cc\n",
> +			  &target_fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index 522e51a404cc..bf8cfefa0365 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -510,7 +510,6 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>   		struct sun4i_layer_state *layer_state =
>   			state_to_sun4i_layer_state(plane_state);
>   		struct drm_framebuffer *fb = plane_state->fb;
> -		struct drm_format_name_buf format_name;
>   
>   		if (!sun4i_backend_plane_is_supported(plane_state,
>   						      &layer_state->uses_frontend))
> @@ -527,9 +526,8 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
>   			}
>   		}
>   
> -		DRM_DEBUG_DRIVER("Plane FB format is %s\n",
> -				 drm_get_format_name(fb->format->format,
> -						     &format_name));
> +		DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
> +				 &fb->format->format);
>   		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
>   			num_alpha_planes++;
>   
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> index 78fdc1d59186..0935686475a0 100644
> --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -42,11 +42,8 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
>   	}
>   
>   	if (fb->format->format != vkms_wb_formats[0]) {
> -		struct drm_format_name_buf format_name;
> -
> -		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> -			      drm_get_format_name(fb->format->format,
> -						  &format_name));
> +		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> +			      &fb->format->format);
>   		return -EINVAL;
>   	}
>   
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index bc67f2b930e1..0cd2c55036bb 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -895,7 +895,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>   	struct vmw_framebuffer_surface *vfbs;
>   	enum SVGA3dSurfaceFormat format;
>   	int ret;
> -	struct drm_format_name_buf format_name;
>   
>   	/* 3D is only supported on HWv8 and newer hosts */
>   	if (dev_priv->active_display_unit == vmw_du_legacy)
> @@ -933,8 +932,8 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
>   		format = SVGA3D_A1R5G5B5;
>   		break;
>   	default:
> -		DRM_ERROR("Invalid pixel format: %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid pixel format: %p4cc\n",
> +			  &mode_cmd->pixel_format);
>   		return -EINVAL;
>   	}
>   
> @@ -1149,7 +1148,6 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>   	uint32_t format;
>   	struct vmw_resource *res;
>   	unsigned int bytes_pp;
> -	struct drm_format_name_buf format_name;
>   	int ret;
>   
>   	switch (mode_cmd->pixel_format) {
> @@ -1171,8 +1169,8 @@ static int vmw_create_bo_proxy(struct drm_device *dev,
>   		break;
>   
>   	default:
> -		DRM_ERROR("Invalid framebuffer format %s\n",
> -			  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +		DRM_ERROR("Invalid framebuffer format %p4cc\n",
> +			  &mode_cmd->pixel_format);
>   		return -EINVAL;
>   	}
>   
> @@ -1216,7 +1214,6 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>   	struct drm_device *dev = dev_priv->dev;
>   	struct vmw_framebuffer_bo *vfbd;
>   	unsigned int requested_size;
> -	struct drm_format_name_buf format_name;
>   	int ret;
>   
>   	requested_size = mode_cmd->height * mode_cmd->pitches[0];
> @@ -1236,8 +1233,8 @@ static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
>   		case DRM_FORMAT_RGB565:
>   			break;
>   		default:
> -			DRM_ERROR("Invalid pixel format: %s\n",
> -				  drm_get_format_name(mode_cmd->pixel_format, &format_name));
> +			DRM_ERROR("Invalid pixel format: %p4cc\n",
> +				  &mode_cmd->pixel_format);
>   			return -EINVAL;
>   		}
>   	}
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 156b122c0ad5..3ea17b8a79d3 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -318,6 +318,5 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
>   					  int plane);
>   uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
>   				   int plane, unsigned int buffer_width);
> -const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
>   
>   #endif /* __DRM_FOURCC_H__ */
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

Hi Thomas,

Thanks for the review.

On Tue, Feb 16, 2021 at 09:37:45AM +0100, Thomas Zimmermann wrote:
> Hi
> 
> Am 15.02.21 um 12:40 schrieb Sakari Ailus:
> > Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> > large number of temporary variables at the same time.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
> >   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
> >   .../arm/display/komeda/komeda_format_caps.h   | 11 --------
> >   .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
> >   .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
> >   drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
> >   drivers/gpu/drm/drm_atomic.c                  |  8 ++----
> >   drivers/gpu/drm/drm_crtc.c                    |  7 ++----
> >   drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
> >   drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
> >   drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
> >   drivers/gpu/drm/drm_plane.c                   |  8 ++----
> >   .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
> >   drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
> >   .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
> >   drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
> >   drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
> >   drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
> >   drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
> >   drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
> >   drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
> >   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
> >   include/drm/drm_fourcc.h                      |  1 -
> >   27 files changed, 64 insertions(+), 157 deletions(-)
> 
> This is a nice patchset. For the driver-related changes:
> 
> Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
> 
> But landing this patch will certainly give us build errors. There are at
> least 3 git trees involved: drm-misc-next, amd and i915. I'd expect at least
> one of them to have additional changes that still require
> drm_get_format_name().
> 
> IMHO we should remove drm_get_format_name() in a later patch. Please remove
> the changes in drm_fourcc.{c,h} from this patch and maybe add a TODO comment
> to the declaration that the function is supposed to be removed.
> 
> I would merge the patchset through drm-misc-next. And the final removal
> patch during the next cycle. Ok?

Sounds good. I'll split the third patch into two then. 

-- 
Kind regards,

Sakari Ailus

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Sakari Ailus]

Hi Thomas,

Thanks for the review.

On Tue, Feb 16, 2021 at 09:37:45AM +0100, Thomas Zimmermann wrote:
> Hi
> 
> Am 15.02.21 um 12:40 schrieb Sakari Ailus:
> > Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> > large number of temporary variables at the same time.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
> >   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
> >   .../arm/display/komeda/komeda_format_caps.h   | 11 --------
> >   .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
> >   .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
> >   drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
> >   drivers/gpu/drm/drm_atomic.c                  |  8 ++----
> >   drivers/gpu/drm/drm_crtc.c                    |  7 ++----
> >   drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
> >   drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
> >   drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
> >   drivers/gpu/drm/drm_plane.c                   |  8 ++----
> >   .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
> >   drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
> >   .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
> >   drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
> >   drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
> >   drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
> >   drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
> >   drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
> >   drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
> >   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
> >   include/drm/drm_fourcc.h                      |  1 -
> >   27 files changed, 64 insertions(+), 157 deletions(-)
> 
> This is a nice patchset. For the driver-related changes:
> 
> Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
> 
> But landing this patch will certainly give us build errors. There are at
> least 3 git trees involved: drm-misc-next, amd and i915. I'd expect at least
> one of them to have additional changes that still require
> drm_get_format_name().
> 
> IMHO we should remove drm_get_format_name() in a later patch. Please remove
> the changes in drm_fourcc.{c,h} from this patch and maybe add a TODO comment
> to the declaration that the function is supposed to be removed.
> 
> I would merge the patchset through drm-misc-next. And the final removal
> patch during the next cycle. Ok?

Sounds good. I'll split the third patch into two then. 

-- 
Kind regards,

Sakari Ailus
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Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Petr Mladek]

On Tue 2021-02-16 09:37:45, Thomas Zimmermann wrote:
> Hi
> 
> Am 15.02.21 um 12:40 schrieb Sakari Ailus:
> > Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> > large number of temporary variables at the same time.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
> >   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
> >   .../arm/display/komeda/komeda_format_caps.h   | 11 --------
> >   .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
> >   .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
> >   drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
> >   drivers/gpu/drm/drm_atomic.c                  |  8 ++----
> >   drivers/gpu/drm/drm_crtc.c                    |  7 ++----
> >   drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
> >   drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
> >   drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
> >   drivers/gpu/drm/drm_plane.c                   |  8 ++----
> >   .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
> >   drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
> >   .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
> >   drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
> >   drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
> >   drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
> >   drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
> >   drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
> >   drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
> >   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
> >   include/drm/drm_fourcc.h                      |  1 -
> >   27 files changed, 64 insertions(+), 157 deletions(-)
> 
> This is a nice patchset. For the driver-related changes:
> 
> Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
> 
> But landing this patch will certainly give us build errors. There are at
> least 3 git trees involved: drm-misc-next, amd and i915. I'd expect at least
> one of them to have additional changes that still require
> drm_get_format_name().
> 
> IMHO we should remove drm_get_format_name() in a later patch. Please remove
> the changes in drm_fourcc.{c,h} from this patch and maybe add a TODO comment
> to the declaration that the function is supposed to be removed.
> 
> I would merge the patchset through drm-misc-next. And the final removal
> patch during the next cycle. Ok?

Sounds like a plan. I am fine with it from the vsprintf side.

Best Regards,
Petr

Re: [PATCH v7 3/3] drm: Switch to %p4cc format modifier

[Petr Mladek]

On Tue 2021-02-16 09:37:45, Thomas Zimmermann wrote:
> Hi
> 
> Am 15.02.21 um 12:40 schrieb Sakari Ailus:
> > Switch DRM drivers from drm_get_format_name() to %p4cc. This gets rid of a
> > large number of temporary variables at the same time.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |  5 ++--
> >   drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |  5 ++--
> >   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  5 ++--
> >   .../arm/display/komeda/komeda_format_caps.h   | 11 --------
> >   .../arm/display/komeda/komeda_framebuffer.c   |  4 +--
> >   .../gpu/drm/arm/display/komeda/komeda_plane.c |  6 ++---
> >   drivers/gpu/drm/arm/malidp_mw.c               |  7 ++----
> >   drivers/gpu/drm/drm_atomic.c                  |  8 ++----
> >   drivers/gpu/drm/drm_crtc.c                    |  7 ++----
> >   drivers/gpu/drm/drm_fourcc.c                  | 25 -------------------
> >   drivers/gpu/drm/drm_framebuffer.c             | 11 +++-----
> >   drivers/gpu/drm/drm_mipi_dbi.c                |  5 ++--
> >   drivers/gpu/drm/drm_plane.c                   |  8 ++----
> >   .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c   |  5 ++--
> >   drivers/gpu/drm/i915/display/intel_display.c  | 14 +++--------
> >   .../drm/i915/display/intel_display_debugfs.c  | 19 ++++++--------
> >   drivers/gpu/drm/i915/display/intel_sprite.c   |  6 ++---
> >   drivers/gpu/drm/mcde/mcde_display.c           |  6 ++---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++---
> >   drivers/gpu/drm/nouveau/nouveau_display.c     |  9 +++----
> >   drivers/gpu/drm/radeon/atombios_crtc.c        | 10 +++-----
> >   drivers/gpu/drm/sun4i/sun4i_backend.c         |  6 ++---
> >   drivers/gpu/drm/vkms/vkms_writeback.c         |  7 ++----
> >   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 15 +++++------
> >   include/drm/drm_fourcc.h                      |  1 -
> >   27 files changed, 64 insertions(+), 157 deletions(-)
> 
> This is a nice patchset. For the driver-related changes:
> 
> Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
> 
> But landing this patch will certainly give us build errors. There are at
> least 3 git trees involved: drm-misc-next, amd and i915. I'd expect at least
> one of them to have additional changes that still require
> drm_get_format_name().
> 
> IMHO we should remove drm_get_format_name() in a later patch. Please remove
> the changes in drm_fourcc.{c,h} from this patch and maybe add a TODO comment
> to the declaration that the function is supposed to be removed.
> 
> I would merge the patchset through drm-misc-next. And the final removal
> patch during the next cycle. Ok?

Sounds like a plan. I am fine with it from the vsprintf side.

Best Regards,
Petr
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