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| author | Max Staudt <mstaudt@suse.de> | 2016-06-13 19:15:59 +0200 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2016-08-11 17:54:56 +0300 |
| commit | d50b3f43db739f03fcf8c0a00664b3d2fed0496e (patch) | |
| tree | 0c8644cab0c1937ba4b0827c306aa97875a014ef /drivers/video | |
| parent | 71668292151efc7ca867e6b6ac0cb603f1d59e42 (diff) | |
| download | linux-d50b3f43db739f03fcf8c0a00664b3d2fed0496e.tar.gz linux-d50b3f43db739f03fcf8c0a00664b3d2fed0496e.tar.bz2 linux-d50b3f43db739f03fcf8c0a00664b3d2fed0496e.zip | |
fbdev/efifb: Fix 16 color palette entry calculation
When using efifb with a 16-bit (5:6:5) visual, fbcon's text is rendered
in the wrong colors - e.g. text gray (#aaaaaa) is rendered as green
(#50bc50) and neighboring pixels have slightly different values
(such as #50bc78).
The reason is that fbcon loads its 16 color palette through
efifb_setcolreg(), which in turn calculates a 32-bit value to write
into memory for each palette index.
Until now, this code could only handle 8-bit visuals and didn't mask
overlapping values when ORing them.
With this patch, fbcon displays the correct colors when a qemu VM is
booted in 16-bit mode (in GRUB: "set gfxpayload=800x600x16").
Fixes: 7c83172b98e5 ("x86_64 EFI boot support: EFI frame buffer driver") # v2.6.24+
Signed-off-by: Max Staudt <mstaudt@suse.de>
Acked-By: Peter Jones <pjones@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/efifb.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index 924bad45c176..37a37c4d04cb 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -50,9 +50,9 @@ static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green, return 1; if (regno < 16) { - red >>= 8; - green >>= 8; - blue >>= 8; + red >>= 16 - info->var.red.length; + green >>= 16 - info->var.green.length; + blue >>= 16 - info->var.blue.length; ((u32 *)(info->pseudo_palette))[regno] = (red << info->var.red.offset) | (green << info->var.green.offset) | |