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drm: psuedocolor support for ARGB modes

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If there is an alpha channel, need to mask in 1's in the alpha channel
to prevent the fb from being completely transparent.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Rob Clark 2011-02-16 02:45:51 +00:00 committed by Dave Airlie
parent a250b9fdc5
commit 9da12b6aeb
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/drm_fb_helper.c
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@ -627,6 +627,11 @@ static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
value = (red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
if (info->var.transp.length > 0) {
u32 mask = (1 << info->var.transp.length) - 1;
mask <<= info->var.transp.offset;
value |= mask;
}
palette[regno] = value;
return 0;
}