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sna: Se the default gamma if left uninitialized by the driver 

Due to a bug in i915.ko the gamma ramp is left uninitialised...

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-06-26 17:01:37 +01:00
parent 491f4fab21
commit d7be3df2fe
1 changed files with 19 additions and 5 deletions
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24
src/sna/sna_display.c
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@ -3016,6 +3016,7 @@ static bool sna_probe_initial_configuration(struct sna *sna)
gamma = malloc(3 * mode.gamma_size * sizeof(uint16_t));
if (gamma) {
struct drm_mode_crtc_lut lut;
bool gamma_set = false;
lut.crtc_id = mode.crtc_id;
lut.gamma_size = mode.gamma_size;
@ -3023,12 +3024,25 @@ static bool sna_probe_initial_configuration(struct sna *sna)
lut.green = (uintptr_t)(gamma + mode.gamma_size);
lut.blue = (uintptr_t)(gamma + 2 * mode.gamma_size);
if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETGAMMA, &lut) == 0) {
free(crtc->gamma_red);
crtc->gamma_size = mode.gamma_size;
crtc->gamma_red = gamma;
crtc->gamma_green = gamma + mode.gamma_size;
crtc->gamma_blue = gamma + 2*mode.gamma_size;
gamma_set =
gamma[mode.gamma_size - 1] &&
gamma[2*mode.gamma_size - 1] &&
gamma[3*mode.gamma_size - 1];
}
if (!gamma_set) {
for (j = 0; j < mode.gamma_size; j++) {
gamma[j] = j << 8;
gamma[mode.gamma_size + j] = j << 8;
gamma[2* mode.gamma_size + j] = j << 8;
}
}
free(crtc->gamma_red);
crtc->gamma_size = mode.gamma_size;
crtc->gamma_red = gamma;
crtc->gamma_green = gamma + mode.gamma_size;
crtc->gamma_blue = gamma + 2*mode.gamma_size;
}
}