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efifb: BGRT: Improve efifb_bgrt_sanity_check

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For various reasons, at least with x86 EFI firmwares, the xoffset and
yoffset in the BGRT info are not always reliable.

Extensive testing has shown that when the info is correct, the
BGRT image is always exactly centered horizontally (the yoffset variable
is more variable and not always predictable).

This commit simplifies / improves the bgrt_sanity_check to simply
check that the BGRT image is exactly centered horizontally and skips
(re)drawing it when it is not.

This fixes the BGRT image sometimes being drawn in the wrong place.

Cc: stable@vger.kernel.org
Fixes: 88fe4ceb24 ("efifb: BGRT: Do not copy the boot graphics for non native resolutions")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: Peter Jones <pjones@redhat.com>,
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190721131918.10115-1-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2019-07-21 15:19:18 +02:00 committed by Bartlomiej Zolnierkiewicz
parent d777478599
commit 51677dfcc1
1 changed files with 6 additions and 21 deletions
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27
drivers/video/fbdev/efifb.c
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@ -122,28 +122,13 @@ static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
*/
static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
{
static const int default_resolutions[][2] = {
{ 800, 600 },
{ 1024, 768 },
{ 1280, 1024 },
};
u32 i, right_margin;
/*
* All x86 firmwares horizontally center the image (the yoffset
* calculations differ between boards, but xoffset is predictable).
*/
u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
for (i = 0; i < ARRAY_SIZE(default_resolutions); i++) {
if (default_resolutions[i][0] == si->lfb_width &&
default_resolutions[i][1] == si->lfb_height)
break;
}
/* If not a default resolution used for textmode, this should be fine */
if (i >= ARRAY_SIZE(default_resolutions))
return true;
/* If the right margin is 5 times smaller then the left one, reject */
right_margin = si->lfb_width - (bgrt_tab.image_offset_x + bmp_width);
if (right_margin < (bgrt_tab.image_offset_x / 5))
return false;
return true;
return bgrt_tab.image_offset_x == expected_xoffset;
}
#else
static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)