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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 13/14] efi/gop: Allow specifying depth as well as resolution
Date: Thu, 19 Mar 2020 15:28:54 -0400
Message-ID: <20200319192855.29876-14-nivedita@alum.mit.edu> (raw)
In-Reply-To: <20200319192855.29876-1-nivedita@alum.mit.edu>

Extend the video mode argument to handle an optional color depth
specification of the form
	video=efifb:<xres>x<yres>[-(rgb|bgr|<bpp>)]

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
---
 Documentation/fb/efifb.rst         |  8 +++--
 drivers/firmware/efi/libstub/gop.c | 48 ++++++++++++++++++++++++++----
 2 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/Documentation/fb/efifb.rst b/Documentation/fb/efifb.rst
index 635275071307..eca38466487a 100644
--- a/Documentation/fb/efifb.rst
+++ b/Documentation/fb/efifb.rst
@@ -50,9 +50,11 @@ mode=n
         The EFI stub will set the mode of the display to mode number n if
         possible.
 
-<xres>x<yres>
+<xres>x<yres>[-(rgb|bgr|<bpp>)]
         The EFI stub will search for a display mode that matches the specified
-        horizontal and vertical resolution, and set the mode of the display to
-        it if one is found.
+        horizontal and vertical resolution, and optionally bit depth, and set
+        the mode of the display to it if one is found. The bit depth can either
+        "rgb" or "bgr" to match specifically those pixel formats, or a number
+        for a mode with matching bits per pixel.
 
 Edgar Hucek <gimli@dark-green.com>
diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index 2d56efaa1600..671f812e0b5a 100644
--- a/drivers/firmware/efi/libstub/gop.c
+++ b/drivers/firmware/efi/libstub/gop.c
@@ -27,6 +27,8 @@ static struct {
 		u32 mode;
 		struct {
 			u32 width, height;
+			int format;
+			u8 depth;
 		} res;
 	};
 } __efistub_global cmdline = { .option = EFI_CMDLINE_NONE };
@@ -50,7 +52,8 @@ static bool parse_modenum(char *option, char **next)
 
 static bool parse_res(char *option, char **next)
 {
-	u32 w, h;
+	u32 w, h, d = 0;
+	int pf = -1;
 
 	if (!isdigit(*option))
 		return false;
@@ -58,11 +61,26 @@ static bool parse_res(char *option, char **next)
 	if (*option++ != 'x' || !isdigit(*option))
 		return false;
 	h = simple_strtoull(option, &option, 10);
+	if (*option == '-') {
+		option++;
+		if (strstarts(option, "rgb")) {
+			option += strlen("rgb");
+			pf = PIXEL_RGB_RESERVED_8BIT_PER_COLOR;
+		} else if (strstarts(option, "bgr")) {
+			option += strlen("bgr");
+			pf = PIXEL_BGR_RESERVED_8BIT_PER_COLOR;
+		} else if (isdigit(*option))
+			d = simple_strtoull(option, &option, 10);
+		else
+			return false;
+	}
 	if (*option && *option++ != ',')
 		return false;
 	cmdline.option     = EFI_CMDLINE_RES;
 	cmdline.res.width  = w;
 	cmdline.res.height = h;
+	cmdline.res.format = pf;
+	cmdline.res.depth  = d;
 
 	*next = option;
 	return true;
@@ -123,6 +141,18 @@ static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
 	return cmdline.mode;
 }
 
+static u8 pixel_bpp(int pixel_format, efi_pixel_bitmask_t pixel_info)
+{
+	if (pixel_format == PIXEL_BIT_MASK) {
+		u32 mask = pixel_info.red_mask | pixel_info.green_mask |
+			   pixel_info.blue_mask | pixel_info.reserved_mask;
+		if (!mask)
+			return 0;
+		return __fls(mask) - __ffs(mask) + 1;
+	} else
+		return 32;
+}
+
 static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
 {
 	efi_status_t status;
@@ -133,16 +163,21 @@ static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
 
 	u32 max_mode, cur_mode;
 	int pf;
+	efi_pixel_bitmask_t pi;
 	u32 m, w, h;
 
 	mode = efi_table_attr(gop, mode);
 
 	cur_mode = efi_table_attr(mode, mode);
 	info = efi_table_attr(mode, info);
-	w = info->horizontal_resolution;
-	h = info->vertical_resolution;
+	pf = info->pixel_format;
+	pi = info->pixel_information;
+	w  = info->horizontal_resolution;
+	h  = info->vertical_resolution;
 
-	if (w == cmdline.res.width && h == cmdline.res.height)
+	if (w == cmdline.res.width && h == cmdline.res.height &&
+	    (cmdline.res.format < 0 || cmdline.res.format == pf) &&
+	    (!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
 		return cur_mode;
 
 	max_mode = efi_table_attr(mode, max_mode);
@@ -157,6 +192,7 @@ static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
 			continue;
 
 		pf = info->pixel_format;
+		pi = info->pixel_information;
 		w  = info->horizontal_resolution;
 		h  = info->vertical_resolution;
 
@@ -164,7 +200,9 @@ static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
 
 		if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
 			continue;
-		if (w == cmdline.res.width && h == cmdline.res.height)
+		if (w == cmdline.res.width && h == cmdline.res.height &&
+		    (cmdline.res.format < 0 || cmdline.res.format == pf) &&
+		    (!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
 			return m;
 	}
 
-- 
2.24.1


  parent reply index

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-19 19:28 [PATCH 00/14] efi/gop: Refactoring + mode-setting feature Arvind Sankar
2020-03-19 19:28 ` [PATCH 01/14] efi/gop: Remove redundant current_fb_base Arvind Sankar
2020-03-19 19:28 ` [PATCH 02/14] efi/gop: Move check for framebuffer before con_out Arvind Sankar
2020-03-19 19:28 ` [PATCH 03/14] efi/gop: Get mode information outside the loop Arvind Sankar
2020-03-19 19:28 ` [PATCH 04/14] efi/gop: Factor out locating the gop into a function Arvind Sankar
2020-03-19 19:28 ` [PATCH 05/14] efi/gop: Slightly re-arrange logic of find_gop Arvind Sankar
2020-03-19 19:28 ` [PATCH 06/14] efi/gop: Move variable declarations into loop block Arvind Sankar
2020-03-19 19:28 ` [PATCH 07/14] efi/gop: Use helper macros for populating lfb_base Arvind Sankar
2020-03-19 19:28 ` [PATCH 08/14] efi/gop: Use helper macros for find_bits Arvind Sankar
2020-03-19 19:28 ` [PATCH 09/14] efi/gop: Remove unreachable code from setup_pixel_info Arvind Sankar
2020-03-19 19:28 ` [PATCH 10/14] efi/gop: Add prototypes for query_mode and set_mode Arvind Sankar
2020-03-19 19:28 ` [PATCH 11/14] efi/gop: Allow specifying mode number on command line Arvind Sankar
2020-03-19 22:53   ` kbuild test robot
2020-03-20  1:09   ` kbuild test robot
2020-03-20 14:36   ` Dan Carpenter
2020-03-20 17:51     ` Arvind Sankar
2020-03-19 19:28 ` [PATCH 12/14] efi/gop: Allow specifying mode by <xres>x<yres> Arvind Sankar
2020-03-19 19:28 ` Arvind Sankar [this message]
2020-03-19 19:28 ` [PATCH 14/14] efi/gop: Allow automatically choosing the best mode Arvind Sankar
2020-03-19 20:02 ` [PATCH 00/14] efi/gop: Refactoring + mode-setting feature Ard Biesheuvel
2020-03-20  2:00 ` [PATCH v2 " Arvind Sankar
2020-03-25 16:41   ` Ard Biesheuvel
2020-03-25 22:10     ` Arvind Sankar
2020-03-25 23:36       ` Ard Biesheuvel
2020-03-26 10:41         ` Ard Biesheuvel
2020-03-28 16:06           ` efi/gop: skip cur_mode in choose_mode_auto Arvind Sankar
2020-03-28 16:06             ` [PATCH v3] efi/gop: Allow automatically choosing the best mode Arvind Sankar
2020-03-29  7:47             ` efi/gop: skip cur_mode in choose_mode_auto Ard Biesheuvel
2020-03-26 23:56         ` [PATCH v2 00/14] efi/gop: Refactoring + mode-setting feature Arvind Sankar
2020-03-28 15:43           ` Ard Biesheuvel
2020-03-25 16:50   ` Hans de Goede
2020-03-25 22:13     ` Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 01/14] efi/gop: Remove redundant current_fb_base Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 02/14] efi/gop: Move check for framebuffer before con_out Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 03/14] efi/gop: Get mode information outside the loop Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 04/14] efi/gop: Factor out locating the gop into a function Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 05/14] efi/gop: Slightly re-arrange logic of find_gop Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 06/14] efi/gop: Move variable declarations into loop block Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 07/14] efi/gop: Use helper macros for populating lfb_base Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 08/14] efi/gop: Use helper macros for find_bits Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 09/14] efi/gop: Remove unreachable code from setup_pixel_info Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 10/14] efi/gop: Add prototypes for query_mode and set_mode Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 11/14] efi/gop: Allow specifying mode number on command line Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 12/14] efi/gop: Allow specifying mode by <xres>x<yres> Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 13/14] efi/gop: Allow specifying depth as well as resolution Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 14/14] efi/gop: Allow automatically choosing the best mode Arvind Sankar

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