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firmware: coreboot: framebuffer: Ignore reserved pixel color bits 

commit e6acaf25cb upstream.

The coreboot framebuffer doesn't support transparency, its 'reserved'
bit field is merely padding for byte/word alignment of pixel colors [1].
When trying to match the framebuffer to a simplefb format, the kernel
driver unnecessarily requires the format's transparency bit field to
exactly match this padding, even if the former is zero-width.

Due to a coreboot bug [2] (fixed upstream), some boards misreport the
reserved field's size as equal to its position (0x18 for both on a
'Lick' Chromebook), and the driver fails to probe where it would have
otherwise worked fine with e.g. the a8r8g8b8 or x8r8g8b8 formats.

Remove the transparency comparison with reserved bits. When the
bits-per-pixel and other color components match, transparency will
already be in a subset of the reserved field. Not forcing it to match
reserved bits allows the driver to work on the boards which misreport
the reserved field. It also enables using simplefb formats that don't
have transparency bits, although this doesn't currently happen due to
format support and ordering in linux/platform_data/simplefb.h.

[1] https://review.coreboot.org/plugins/gitiles/coreboot/+/4.19/src/commonlib/include/commonlib/coreboot_tables.h#255
[2] https://review.coreboot.org/plugins/gitiles/coreboot/+/4.13/src/drivers/intel/fsp2_0/graphics.c#82

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Link: https://lore.kernel.org/r/20230122190433.195941-1-alpernebiyasak@gmail.com
Cc: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alper Nebi Yasak 2023-01-22 22:04:31 +03:00 committed by Greg Kroah-Hartman
parent 4ed8dca3d5
commit 0407aeed35
1 changed files with 1 additions and 3 deletions
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4
drivers/firmware/google/framebuffer-coreboot.c
View File

@ -43,9 +43,7 @@ static int framebuffer_probe(struct coreboot_device *dev)
fb->green_mask_pos == formats[i].green.offset &&
fb->green_mask_size == formats[i].green.length &&
fb->blue_mask_pos == formats[i].blue.offset &&
fb->blue_mask_size == formats[i].blue.length &&
fb->reserved_mask_pos == formats[i].transp.offset &&
fb->reserved_mask_size == formats[i].transp.length)
fb->blue_mask_size == formats[i].blue.length)
pdata.format = formats[i].name;
}
if (!pdata.format)