[PATCH 0/7] drm: Extend COMPILE_TEST support to some ARM drivers

[PATCH 0/7] drm: Extend COMPILE_TEST support to some ARM drivers

[Laurent Pinchart]

Hello,

This patch series stems from subsystem-wide changes I wanted to
compile-test with an ARM64 cross-compiler. My laziness to fire a 32-bit
ARM build probably resulted in more time being spent writing these
patches, but hopefully they'll turn out to be useful for more people :-)

Patches 1/7 and 2/7 are fixes for compilation warnings on 64-bit
platforms in the omapdrm and sti-drm drivers. They are a dependency for
the Kconfig changes that follow to avoid introducing build warnings, but
could also be merged before.

Patches 3/7 to 7/7 enable compilation of the imx-dcss, omapdrm, sti-drm,
tegra-drm and tilcdc drivers on ARM64 with COMPILE_TEST. The patches are
independent from each other, so they can be picked by their respective
maintainers.

We could also extend test compilation to more architecture, but I didn't
want to remove all dependencies on ARM or ARM64 at this point for fear
or triggering build warnings that I wouldn't be able to catch locally.
If there's a consensus that fully relaxing the platform requirement is
better, I can submit a new version that does so and rely on the 0day bot
to catch issues.

Laurent Pinchart (7):
  drm/omap: Cast pointer to integer safely
  drm/sti: Use correct printk format specifiers for size_t
  drm/imx/dcss: Enable COMPILE_TEST on all ARM64 platforms
  drm/omap: Enable COMPILE_TEST on all ARM and ARM64 platforms
  drm/sti: Enable COMPILE_TEST on all ARM and ARM64 platforms
  drm/tegra: Enable COMPILE_TEST on all ARM64 platforms
  drm/tilcdc: Enable COMPILE_TEST on all ARM64 platforms

 drivers/gpu/drm/imx/dcss/Kconfig   | 3 ++-
 drivers/gpu/drm/omapdrm/Kconfig    | 2 +-
 drivers/gpu/drm/omapdrm/omap_drv.c | 2 +-
 drivers/gpu/drm/sti/Kconfig        | 3 ++-
 drivers/gpu/drm/sti/sti_hqvdp.c    | 4 ++--
 drivers/gpu/drm/tegra/Kconfig      | 2 +-
 drivers/gpu/drm/tilcdc/Kconfig     | 3 ++-
 drivers/gpu/host1x/Kconfig         | 2 +-
 8 files changed, 12 insertions(+), 9 deletions(-)

-- 
Regards,

Laurent Pinchart

[PATCH 1/7] drm/omap: Cast pointer to integer safely

[Laurent Pinchart]

On 64-bit platforms, the compiler complains that casting a void pointer
to an unsigned int loses data. Cast the pointer to a uintptr_t unsigned
to fix this.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/omapdrm/omap_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index f86e20578143..c05d3975cb31 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -572,7 +572,7 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 	priv->dss->mgr_ops_priv = priv;
 
 	soc = soc_device_match(omapdrm_soc_devices);
-	priv->omaprev = soc ? (unsigned int)soc->data : 0;
+	priv->omaprev = soc ? (uintptr_t)soc->data : 0;
 	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
 
 	mutex_init(&priv->list_lock);
-- 
Regards,

Laurent Pinchart

[PATCH 2/7] drm/sti: Use correct printk format specifiers for size_t

[Laurent Pinchart]

The correct format specifier for size_t is %zu. Using %d (or %u)
generates a warning on 64-bit platforms. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/sti/sti_hqvdp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_hqvdp.c b/drivers/gpu/drm/sti/sti_hqvdp.c
index d09b08995b12..3c61ba8b43e0 100644
--- a/drivers/gpu/drm/sti/sti_hqvdp.c
+++ b/drivers/gpu/drm/sti/sti_hqvdp.c
@@ -927,12 +927,12 @@ static void sti_hqvdp_start_xp70(struct sti_hqvdp *hqvdp)
 
 	header = (struct fw_header *)firmware->data;
 	if (firmware->size < sizeof(*header)) {
-		DRM_ERROR("Invalid firmware size (%d)\n", firmware->size);
+		DRM_ERROR("Invalid firmware size (%zu)\n", firmware->size);
 		goto out;
 	}
 	if ((sizeof(*header) + header->rd_size + header->wr_size +
 		header->pmem_size + header->dmem_size) != firmware->size) {
-		DRM_ERROR("Invalid fmw structure (%d+%d+%d+%d+%d != %d)\n",
+		DRM_ERROR("Invalid fmw structure (%zu+%d+%d+%d+%d != %zu)\n",
 			  sizeof(*header), header->rd_size, header->wr_size,
 			  header->pmem_size, header->dmem_size,
 			  firmware->size);
-- 
Regards,

Laurent Pinchart

[PATCH 3/7] drm/imx/dcss: Enable COMPILE_TEST on all ARM64 platforms

[Laurent Pinchart]

To extend test coverage, relax the dependency on ARCH_MXC to also enable
compilation when COMPILE_TEST is selected.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/imx/dcss/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imx/dcss/Kconfig b/drivers/gpu/drm/imx/dcss/Kconfig
index 2b17a964ff05..ad9844fb85ac 100644
--- a/drivers/gpu/drm/imx/dcss/Kconfig
+++ b/drivers/gpu/drm/imx/dcss/Kconfig
@@ -3,7 +3,8 @@ config DRM_IMX_DCSS
 	select IMX_IRQSTEER
 	select DRM_KMS_CMA_HELPER
 	select VIDEOMODE_HELPERS
-	depends on DRM && ARCH_MXC && ARM64
+	depends on DRM
+	depends on ARM64 && (ARCH_MXC || COMPILE_TEST)
 	help
 	  Choose this if you have a NXP i.MX8MQ based system and want to use the
 	  Display Controller Subsystem. This option enables DCSS support.
-- 
Regards,

Laurent Pinchart

[PATCH 4/7] drm/omap: Enable COMPILE_TEST on all ARM and ARM64 platforms

[Laurent Pinchart]

To extend test coverage, relax the dependency on ARCH_OMAP2PLUS or
ARCH_MULTIPLATFORM to also enable compilation on ARM or ARM4 when
COMPILE_TEST is selected.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/omapdrm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/omapdrm/Kconfig b/drivers/gpu/drm/omapdrm/Kconfig
index e7281da5bc6a..fd5ef00444c1 100644
--- a/drivers/gpu/drm/omapdrm/Kconfig
+++ b/drivers/gpu/drm/omapdrm/Kconfig
@@ -2,7 +2,7 @@
 config DRM_OMAP
 	tristate "OMAP DRM"
 	depends on DRM
-	depends on ARCH_OMAP2PLUS || ARCH_MULTIPLATFORM
+	depends on ARCH_OMAP2PLUS || ARCH_MULTIPLATFORM || ((ARM || ARM64) && COMPILE_TEST)
 	select OMAP2_DSS
 	select DRM_KMS_HELPER
 	select VIDEOMODE_HELPERS
-- 
Regards,

Laurent Pinchart

[PATCH 5/7] drm/sti: Enable COMPILE_TEST on all ARM and ARM64 platforms

[Laurent Pinchart]

To extend test coverage, relax the dependency on ARCH_STI or
ARCH_MULTIPLATFORM to also enable compilation on ARM or ARM4 when
COMPILE_TEST is selected.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/sti/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sti/Kconfig b/drivers/gpu/drm/sti/Kconfig
index d0cfdd36b38f..e7d18893bc11 100644
--- a/drivers/gpu/drm/sti/Kconfig
+++ b/drivers/gpu/drm/sti/Kconfig
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_STI
 	tristate "DRM Support for STMicroelectronics SoC stiH4xx Series"
-	depends on OF && DRM && (ARCH_STI || ARCH_MULTIPLATFORM)
+	depends on OF && DRM
+	depends on ARCH_STI || ARCH_MULTIPLATFORM || ((ARM || ARM64) && COMPILE_TEST)
 	select RESET_CONTROLLER
 	select DRM_KMS_HELPER
 	select DRM_GEM_CMA_HELPER
-- 
Regards,

Laurent Pinchart

[PATCH 6/7] drm/tegra: Enable COMPILE_TEST on all ARM64 platforms

[Laurent Pinchart]

To extend test coverage, support COMPILE_TEST on ARM64 in addition to
ARM.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/tegra/Kconfig | 2 +-
 drivers/gpu/host1x/Kconfig    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/Kconfig b/drivers/gpu/drm/tegra/Kconfig
index 5043dcaf1cf9..ab3093fdbfa8 100644
--- a/drivers/gpu/drm/tegra/Kconfig
+++ b/drivers/gpu/drm/tegra/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_TEGRA
 	tristate "NVIDIA Tegra DRM"
-	depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
+	depends on ARCH_TEGRA || ((ARM || ARM64) && COMPILE_TEST)
 	depends on COMMON_CLK
 	depends on DRM
 	depends on OF
diff --git a/drivers/gpu/host1x/Kconfig b/drivers/gpu/host1x/Kconfig
index 6dab94adf25e..c3a8521c8068 100644
--- a/drivers/gpu/host1x/Kconfig
+++ b/drivers/gpu/host1x/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config TEGRA_HOST1X
 	tristate "NVIDIA Tegra host1x driver"
-	depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
+	depends on ARCH_TEGRA || ((ARM || ARM64) && COMPILE_TEST)
 	select IOMMU_IOVA
 	help
 	  Driver for the NVIDIA Tegra host1x hardware.
-- 
Regards,

Laurent Pinchart

[PATCH 7/7] drm/tilcdc: Enable COMPILE_TEST on all ARM64 platforms

[Laurent Pinchart]

To extend test coverage, support COMPILE_TEST on ARM64 in addition to
ARM.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/gpu/drm/tilcdc/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tilcdc/Kconfig b/drivers/gpu/drm/tilcdc/Kconfig
index 9f505a149990..37009f4ace9f 100644
--- a/drivers/gpu/drm/tilcdc/Kconfig
+++ b/drivers/gpu/drm/tilcdc/Kconfig
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_TILCDC
 	tristate "DRM Support for TI LCDC Display Controller"
-	depends on DRM && OF && ARM
+	depends on DRM && OF
+	depends on ARM || (ARM64 && COMPILE_TEST)
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
 	select DRM_GEM_CMA_HELPER
-- 
Regards,

Laurent Pinchart

Re: [PATCH 1/7] drm/omap: Cast pointer to integer safely

[Tomi Valkeinen]

On 28/07/2021 18:37, Laurent Pinchart wrote:
> On 64-bit platforms, the compiler complains that casting a void pointer
> to an unsigned int loses data. Cast the pointer to a uintptr_t unsigned
> to fix this.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>   drivers/gpu/drm/omapdrm/omap_drv.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
> index f86e20578143..c05d3975cb31 100644
> --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> @@ -572,7 +572,7 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
>   	priv->dss->mgr_ops_priv = priv;
>   
>   	soc = soc_device_match(omapdrm_soc_devices);
> -	priv->omaprev = soc ? (unsigned int)soc->data : 0;
> +	priv->omaprev = soc ? (uintptr_t)soc->data : 0;
>   	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
>   
>   	mutex_init(&priv->list_lock);
> 

Looks fine, although the subject sounds odd. Why was the cast "unsafe" before, and "safe" now?

There's also another bunch of warnings I see:

drivers/gpu/drm/omapdrm/dss/dsi.c: In function ‘dsi_vc_send_long’:
drivers/gpu/drm/omapdrm/dss/dsi.c:7:25: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘size_t’ {aka ‘const long unsigned int’} [-Wformat=]
     7 | #define DSS_SUBSYS_NAME "DSI"
       |                         ^~~~~
drivers/gpu/drm/omapdrm/dss/dss.h:30:21: note: in expansion of macro ‘DSS_SUBSYS_NAME’
    30 | #define pr_fmt(fmt) DSS_SUBSYS_NAME ": " fmt
       |                     ^~~~~~~~~~~~~~~
./include/linux/dynamic_debug.h:134:15: note: in expansion of macro ‘pr_fmt’
   134 |   func(&id, ##__VA_ARGS__);  \
       |               ^~~~~~~~~~~
./include/linux/dynamic_debug.h:152:2: note: in expansion of macro ‘__dynamic_func_call’
   152 |  __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
       |  ^~~~~~~~~~~~~~~~~~~
./include/linux/dynamic_debug.h:162:2: note: in expansion of macro ‘_dynamic_func_call’
   162 |  _dynamic_func_call(fmt, __dynamic_pr_debug,  \
       |  ^~~~~~~~~~~~~~~~~~
./include/linux/printk.h:471:2: note: in expansion of macro ‘dynamic_pr_debug’
   471 |  dynamic_pr_debug(fmt, ##__VA_ARGS__)
       |  ^~~~~~~~~~~~~~~~
drivers/gpu/drm/omapdrm/dss/dss.h:36:2: note: in expansion of macro ‘pr_debug’
    36 |  pr_debug(format, ## __VA_ARGS__)
       |  ^~~~~~~~
drivers/gpu/drm/omapdrm/dss/dsi.c:2097:3: note: in expansion of macro ‘DSSDBG’
  2097 |   DSSDBG("dsi_vc_send_long, %d bytes\n", msg->tx_len);
       |   ^~~~~~
In file included from ./include/linux/printk.h:7,
                  from ./include/linux/kernel.h:19,
                  from drivers/gpu/drm/omapdrm/dss/dsi.c:9:
drivers/gpu/drm/omapdrm/dss/dsi.c: In function ‘dsi_vc_generic_read’:
./include/linux/kern_levels.h:5:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘size_t’ {aka ‘const long unsigned int’} [-Wformat=]
     5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
       |                  ^~~~~~
./include/linux/kern_levels.h:11:18: note: in expansion of macro ‘KERN_SOH’
    11 | #define KERN_ERR KERN_SOH "3" /* error conditions */
       |                  ^~~~~~~~
./include/linux/printk.h:390:9: note: in expansion of macro ‘KERN_ERR’
   390 |  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
       |         ^~~~~~~~
drivers/gpu/drm/omapdrm/dss/dss.h:40:2: note: in expansion of macro ‘pr_err’
    40 |  pr_err("omapdss " DSS_SUBSYS_NAME " error: " format, ##__VA_ARGS__)
       |  ^~~~~~
drivers/gpu/drm/omapdrm/dss/dsi.c:2393:2: note: in expansion of macro ‘DSSERR’
  2393 |  DSSERR("%s(vc %d, reqlen %d) failed\n", __func__,  vc, msg->tx_len);
       |  ^~~~~~


  Tomi

Re: [PATCH 0/7] drm: Extend COMPILE_TEST support to some ARM drivers

[Tomi Valkeinen]

On 28/07/2021 18:37, Laurent Pinchart wrote:
> Hello,
> 
> This patch series stems from subsystem-wide changes I wanted to
> compile-test with an ARM64 cross-compiler. My laziness to fire a 32-bit
> ARM build probably resulted in more time being spent writing these
> patches, but hopefully they'll turn out to be useful for more people :-)
> 
> Patches 1/7 and 2/7 are fixes for compilation warnings on 64-bit
> platforms in the omapdrm and sti-drm drivers. They are a dependency for
> the Kconfig changes that follow to avoid introducing build warnings, but
> could also be merged before.
> 
> Patches 3/7 to 7/7 enable compilation of the imx-dcss, omapdrm, sti-drm,
> tegra-drm and tilcdc drivers on ARM64 with COMPILE_TEST. The patches are
> independent from each other, so they can be picked by their respective
> maintainers.
> 
> We could also extend test compilation to more architecture, but I didn't
> want to remove all dependencies on ARM or ARM64 at this point for fear
> or triggering build warnings that I wouldn't be able to catch locally.
> If there's a consensus that fully relaxing the platform requirement is
> better, I can submit a new version that does so and rely on the 0day bot
> to catch issues.

I would allow compilation for any architecture if COMPILE_TEST is 
enabled. I think git grep shows that is how COMPILE_TEST is usually used.

  Tomi

Re: [PATCH 2/7] drm/sti: Use correct printk format specifiers for size_t

[Philippe CORNU]

On 7/28/21 5:37 PM, Laurent Pinchart wrote:
> The correct format specifier for size_t is %zu. Using %d (or %u)
> generates a warning on 64-bit platforms. Fix it.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>   drivers/gpu/drm/sti/sti_hqvdp.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sti/sti_hqvdp.c b/drivers/gpu/drm/sti/sti_hqvdp.c
> index d09b08995b12..3c61ba8b43e0 100644
> --- a/drivers/gpu/drm/sti/sti_hqvdp.c
> +++ b/drivers/gpu/drm/sti/sti_hqvdp.c
> @@ -927,12 +927,12 @@ static void sti_hqvdp_start_xp70(struct sti_hqvdp *hqvdp)
>   
>   	header = (struct fw_header *)firmware->data;
>   	if (firmware->size < sizeof(*header)) {
> -		DRM_ERROR("Invalid firmware size (%d)\n", firmware->size);
> +		DRM_ERROR("Invalid firmware size (%zu)\n", firmware->size);
>   		goto out;
>   	}
>   	if ((sizeof(*header) + header->rd_size + header->wr_size +
>   		header->pmem_size + header->dmem_size) != firmware->size) {
> -		DRM_ERROR("Invalid fmw structure (%d+%d+%d+%d+%d != %d)\n",
> +		DRM_ERROR("Invalid fmw structure (%zu+%d+%d+%d+%d != %zu)\n",

Hi Laurent,

Looping Benjamin (new email address) and Alain (future maintainer of 
drm/sti).

Reviewed-by: Philippe Cornu <philippe.cornu@foss.st.com>
Many thanks for your patch,
Philippe :-)

>   			  sizeof(*header), header->rd_size, header->wr_size,
>   			  header->pmem_size, header->dmem_size,
>   			  firmware->size);
> 

Re: [PATCH 5/7] drm/sti: Enable COMPILE_TEST on all ARM and ARM64 platforms

[Philippe CORNU]

On 7/28/21 5:37 PM, Laurent Pinchart wrote:
> To extend test coverage, relax the dependency on ARCH_STI or
> ARCH_MULTIPLATFORM to also enable compilation on ARM or ARM4 when

Hi Laurent,

Looping Benjamin (new email address) and Alain (future maintainer of 
drm/sti).

minor typo (ARM4 -> ARM64)

Reviewed-by: Philippe Cornu <philippe.cornu@foss.st.com>
Many thanks for your patch,
Philippe :-)


> COMPILE_TEST is selected.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>   drivers/gpu/drm/sti/Kconfig | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/sti/Kconfig b/drivers/gpu/drm/sti/Kconfig
> index d0cfdd36b38f..e7d18893bc11 100644
> --- a/drivers/gpu/drm/sti/Kconfig
> +++ b/drivers/gpu/drm/sti/Kconfig
> @@ -1,7 +1,8 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   config DRM_STI
>   	tristate "DRM Support for STMicroelectronics SoC stiH4xx Series"
> -	depends on OF && DRM && (ARCH_STI || ARCH_MULTIPLATFORM)
> +	depends on OF && DRM
> +	depends on ARCH_STI || ARCH_MULTIPLATFORM || ((ARM || ARM64) && COMPILE_TEST)
>   	select RESET_CONTROLLER
>   	select DRM_KMS_HELPER
>   	select DRM_GEM_CMA_HELPER
> 

Re: [PATCH 3/7] drm/imx/dcss: Enable COMPILE_TEST on all ARM64 platforms

[Geert Uytterhoeven]

Hi Laurent,

On Wed, Jul 28, 2021 at 5:37 PM Laurent Pinchart
<laurent.pinchart+renesas@ideasonboard.com> wrote:
> To extend test coverage, relax the dependency on ARCH_MXC to also enable
> compilation when COMPILE_TEST is selected.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Thanks for your patch!

> --- a/drivers/gpu/drm/imx/dcss/Kconfig
> +++ b/drivers/gpu/drm/imx/dcss/Kconfig
> @@ -3,7 +3,8 @@ config DRM_IMX_DCSS
>         select IMX_IRQSTEER
>         select DRM_KMS_CMA_HELPER
>         select VIDEOMODE_HELPERS
> -       depends on DRM && ARCH_MXC && ARM64
> +       depends on DRM
> +       depends on ARM64 && (ARCH_MXC || COMPILE_TEST)

As you now have two depends statements, I think this would be easier
to read by maintaining a strict separation between "hard" and "soft"
dependencies:

    depends on DRM && ARM64
    depends on ARCH_MXC || COMPILE_TEST

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 3/7] drm/imx/dcss: Enable COMPILE_TEST on all ARM64 platforms

[Philipp Zabel]

On Fri, 2021-07-30 at 14:10 +0200, Geert Uytterhoeven wrote:
> Hi Laurent,
> 
> On Wed, Jul 28, 2021 at 5:37 PM Laurent Pinchart
> <laurent.pinchart+renesas@ideasonboard.com> wrote:
> > To extend test coverage, relax the dependency on ARCH_MXC to also enable
> > compilation when COMPILE_TEST is selected.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> 
> Thanks for your patch!
> 
> > --- a/drivers/gpu/drm/imx/dcss/Kconfig
> > +++ b/drivers/gpu/drm/imx/dcss/Kconfig
> > @@ -3,7 +3,8 @@ config DRM_IMX_DCSS
> >         select IMX_IRQSTEER
> >         select DRM_KMS_CMA_HELPER
> >         select VIDEOMODE_HELPERS
> > -       depends on DRM && ARCH_MXC && ARM64
> > +       depends on DRM
> > +       depends on ARM64 && (ARCH_MXC || COMPILE_TEST)
> 
> As you now have two depends statements, I think this would be easier
> to read by maintaining a strict separation between "hard" and "soft"
> dependencies:
> 
>     depends on DRM && ARM64
>     depends on ARCH_MXC || COMPILE_TEST

I would let (ARCH_MXC && ARM64) stay together, and as Tomi suggested,
lift the ARM64 limitation if COMPILE_TEST is enabled:

	depends on DRM
	depends on (ARCH_MXC && ARM64) || COMPILE_TEST

regards
Philipp

Re: [PATCH 0/7] drm: Extend COMPILE_TEST support to some ARM drivers

[Laurent Pinchart]

Hi Sam,

On Thu, Jul 29, 2021 at 06:53:33PM +0200, Sam Ravnborg wrote:
> On Wed, Jul 28, 2021 at 06:37:29PM +0300, Laurent Pinchart wrote:
> > Hello,
> > 
> > This patch series stems from subsystem-wide changes I wanted to
> > compile-test with an ARM64 cross-compiler. My laziness to fire a 32-bit
> > ARM build probably resulted in more time being spent writing these
> > patches, but hopefully they'll turn out to be useful for more people :-)
> > 
> > Patches 1/7 and 2/7 are fixes for compilation warnings on 64-bit
> > platforms in the omapdrm and sti-drm drivers. They are a dependency for
> > the Kconfig changes that follow to avoid introducing build warnings, but
> > could also be merged before.
> > 
> > Patches 3/7 to 7/7 enable compilation of the imx-dcss, omapdrm, sti-drm,
> > tegra-drm and tilcdc drivers on ARM64 with COMPILE_TEST. The patches are
> > independent from each other, so they can be picked by their respective
> > maintainers.
> > 
> > We could also extend test compilation to more architecture, but I didn't
> > want to remove all dependencies on ARM or ARM64 at this point for fear
> > or triggering build warnings that I wouldn't be able to catch locally.
> > If there's a consensus that fully relaxing the platform requirement is
> > better, I can submit a new version that does so and rely on the 0day bot
> > to catch issues.
>
> I have alpha, sparc64, and a few more so we can get pretty good coverage
> before it hits -next.

It seems that the consensus is to enable COMPILE_TEST on all platforms,
so I'll do that.

> If we enable more build coverage then please address all W=1 warnings
> first.
> 
> I for once always builds with W=1 these days, and I see more and more
> warnings sneaking in again.
> So lets try to keep the noise level down.

Hmmmm... I build my kernel with -Werror to make sure I catch all
warnings. W=1 doesn't play well with that :-S I'll see if I can turn the
additional warnings into non-errors, but that may become a game of
whack-a-mole.

-- 
Regards,

Laurent Pinchart

Re: [PATCH 1/7] drm/omap: Cast pointer to integer safely

[Laurent Pinchart]

Hi Tomi,

On Thu, Jul 29, 2021 at 09:13:17AM +0300, Tomi Valkeinen wrote:
> On 28/07/2021 18:37, Laurent Pinchart wrote:
> > On 64-bit platforms, the compiler complains that casting a void pointer
> > to an unsigned int loses data. Cast the pointer to a uintptr_t unsigned
> > to fix this.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> > ---
> >   drivers/gpu/drm/omapdrm/omap_drv.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
> > index f86e20578143..c05d3975cb31 100644
> > --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> > +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> > @@ -572,7 +572,7 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
> >   	priv->dss->mgr_ops_priv = priv;
> >   
> >   	soc = soc_device_match(omapdrm_soc_devices);
> > -	priv->omaprev = soc ? (unsigned int)soc->data : 0;
> > +	priv->omaprev = soc ? (uintptr_t)soc->data : 0;
> >   	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
> >   
> >   	mutex_init(&priv->list_lock);
> > 
> 
> Looks fine, although the subject sounds odd. Why was the cast "unsafe"
> before, and "safe" now?

The result is indeed exactly the same. It was safe before, because we
know the value won't exceed 32 bits. I'll s/safely/without generating a
warning/.

> There's also another bunch of warnings I see:

I wonder how I missed those. Will fix.

> drivers/gpu/drm/omapdrm/dss/dsi.c: In function ‘dsi_vc_send_long’:
> drivers/gpu/drm/omapdrm/dss/dsi.c:7:25: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘size_t’ {aka ‘const long unsigned int’} [-Wformat=]
>      7 | #define DSS_SUBSYS_NAME "DSI"
>        |                         ^~~~~
> drivers/gpu/drm/omapdrm/dss/dss.h:30:21: note: in expansion of macro ‘DSS_SUBSYS_NAME’
>     30 | #define pr_fmt(fmt) DSS_SUBSYS_NAME ": " fmt
>        |                     ^~~~~~~~~~~~~~~
> ./include/linux/dynamic_debug.h:134:15: note: in expansion of macro ‘pr_fmt’
>    134 |   func(&id, ##__VA_ARGS__);  \
>        |               ^~~~~~~~~~~
> ./include/linux/dynamic_debug.h:152:2: note: in expansion of macro ‘__dynamic_func_call’
>    152 |  __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
>        |  ^~~~~~~~~~~~~~~~~~~
> ./include/linux/dynamic_debug.h:162:2: note: in expansion of macro ‘_dynamic_func_call’
>    162 |  _dynamic_func_call(fmt, __dynamic_pr_debug,  \
>        |  ^~~~~~~~~~~~~~~~~~
> ./include/linux/printk.h:471:2: note: in expansion of macro ‘dynamic_pr_debug’
>    471 |  dynamic_pr_debug(fmt, ##__VA_ARGS__)
>        |  ^~~~~~~~~~~~~~~~
> drivers/gpu/drm/omapdrm/dss/dss.h:36:2: note: in expansion of macro ‘pr_debug’
>     36 |  pr_debug(format, ## __VA_ARGS__)
>        |  ^~~~~~~~
> drivers/gpu/drm/omapdrm/dss/dsi.c:2097:3: note: in expansion of macro ‘DSSDBG’
>   2097 |   DSSDBG("dsi_vc_send_long, %d bytes\n", msg->tx_len);
>        |   ^~~~~~
> In file included from ./include/linux/printk.h:7,
>                   from ./include/linux/kernel.h:19,
>                   from drivers/gpu/drm/omapdrm/dss/dsi.c:9:
> drivers/gpu/drm/omapdrm/dss/dsi.c: In function ‘dsi_vc_generic_read’:
> ./include/linux/kern_levels.h:5:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘size_t’ {aka ‘const long unsigned int’} [-Wformat=]
>      5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
>        |                  ^~~~~~
> ./include/linux/kern_levels.h:11:18: note: in expansion of macro ‘KERN_SOH’
>     11 | #define KERN_ERR KERN_SOH "3" /* error conditions */
>        |                  ^~~~~~~~
> ./include/linux/printk.h:390:9: note: in expansion of macro ‘KERN_ERR’
>    390 |  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
>        |         ^~~~~~~~
> drivers/gpu/drm/omapdrm/dss/dss.h:40:2: note: in expansion of macro ‘pr_err’
>     40 |  pr_err("omapdss " DSS_SUBSYS_NAME " error: " format, ##__VA_ARGS__)
>        |  ^~~~~~
> drivers/gpu/drm/omapdrm/dss/dsi.c:2393:2: note: in expansion of macro ‘DSSERR’
>   2393 |  DSSERR("%s(vc %d, reqlen %d) failed\n", __func__,  vc, msg->tx_len);
>        |  ^~~~~~
> 

-- 
Regards,

Laurent Pinchart