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drm: Make the CRTC gamma_set operation optional

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Drivers for hardware without gamma support should not be forced to
implement a no-op gamma set operation.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Rob Clark <rob.clark@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Laurent Pinchart
2012-05-17 13:27:24 +02:00
committed by Dave Airlie
parent e6ecefaadf
commit ebe0f2442c
3 changed files with 8 additions and 7 deletions
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3
drivers/gpu/drm/drm_fb_helper.c
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@@ -136,6 +136,9 @@ static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
{
uint16_t *r_base, *g_base, *b_base;
if (crtc->funcs->gamma_set == NULL)
return;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;