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efi: sysfb_efi: Fix lfb_linelength calculation when applying quirks

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PIXEL_BIT_MASK formats can have either less or more than four bytes per
pixel so lets fix the lfb_linelenght calculation when applying the
swapped width and height quirks.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Melissa Wen <mwen@igalia.com>
Cc: linux-efi@vger.kernel.org
Tested-by: Melissa Wen <mwen@igalia.com> # v3
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Tvrtko Ursulin 2025-12-08 20:39:23 +01:00 committed by Ard Biesheuvel
parent bb2c941b31
commit 449b87e81f
1 changed files with 4 additions and 1 deletions
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5
drivers/firmware/efi/sysfb_efi.c
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@ -357,8 +357,11 @@ __init void sysfb_apply_efi_quirks(void)
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
dmi_check_system(efifb_dmi_swap_width_height)) {
u32 bpp = __screen_info_lfb_bits_per_pixel(&screen_info);
swap(screen_info.lfb_width, screen_info.lfb_height);
screen_info.lfb_linelength = 4 * screen_info.lfb_width;
screen_info.lfb_linelength = bpp * screen_info.lfb_width /
BITS_PER_BYTE;
}
}