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efi/gop: Allow specifying depth as well as resolution

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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>
Link: https://lore.kernel.org/r/20200320020028.1936003-14-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Arvind Sankar
2020-03-19 22:00:27 -04:00
committed by Ard Biesheuvel
parent d9ff0323d0
commit 9a1663bc4d
2 changed files with 48 additions and 8 deletions
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48
drivers/firmware/efi/libstub/gop.c
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@@ -27,6 +27,8 @@ static struct {
u32 mode;
struct {
u32 width, height;
int format;
u8 depth;
} res;
};
} cmdline __efistub_global = { .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;
}