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drm/mgag200: Fix LUT programming for 16bpp

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Since there are only 32 (64) distinct color values for each color
in 16bpp Matrox hardware expects those in a 'dense' manner, ie in
the first 32 (64) entries of the respective color.

Signed-off-by: Egbert Eich <eich@suse.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Egbert Eich 2013-07-17 15:07:27 +02:00 committed by Dave Airlie
parent da55839870
commit de7500eafc
1 changed files with 23 additions and 0 deletions
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23
drivers/gpu/drm/mgag200/mgag200_mode.c
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@ -29,6 +29,7 @@ static void mga_crtc_load_lut(struct drm_crtc *crtc)
struct mga_crtc *mga_crtc = to_mga_crtc(crtc);
struct drm_device *dev = crtc->dev;
struct mga_device *mdev = dev->dev_private;
struct drm_framebuffer *fb = crtc->fb;
int i;
if (!crtc->enabled)
@ -36,6 +37,28 @@ static void mga_crtc_load_lut(struct drm_crtc *crtc)
WREG8(DAC_INDEX + MGA1064_INDEX, 0);
if (fb && fb->bits_per_pixel == 16) {
int inc = (fb->depth == 15) ? 8 : 4;
u8 r, b;
for (i = 0; i < MGAG200_LUT_SIZE; i += inc) {
if (fb->depth == 16) {
if (i > (MGAG200_LUT_SIZE >> 1)) {
r = b = 0;
} else {
r = mga_crtc->lut_r[i << 1];
b = mga_crtc->lut_b[i << 1];
}
} else {
r = mga_crtc->lut_r[i];
b = mga_crtc->lut_b[i];
}
/* VGA registers */
WREG8(DAC_INDEX + MGA1064_COL_PAL, r);
WREG8(DAC_INDEX + MGA1064_COL_PAL, mga_crtc->lut_g[i]);
WREG8(DAC_INDEX + MGA1064_COL_PAL, b);
}
return;
}
for (i = 0; i < MGAG200_LUT_SIZE; i++) {
/* VGA registers */
WREG8(DAC_INDEX + MGA1064_COL_PAL, mga_crtc->lut_r[i]);