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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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8
Documentation/fb/efifb.rst
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@@ -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>