drm: expand gamma_set
Expand the crtc_gamma_set function to accept a starting offset. The
reason for this is to eventually use this function for setcolreg from
drm_fb_helper.c. The fbdev colormap function can start at any offset in
the color map.
Signed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ec8336a..6bb5ffc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4330,15 +4330,12 @@
}
static void intel_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
- u16 *blue, uint32_t size)
+ u16 *blue, uint32_t start, uint32_t size)
{
+ int end = (start + size > 256) ? 256 : start + size, i;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
- int i;
- if (size != 256)
- return;
-
- for (i = 0; i < 256; i++) {
+ for (i = start; i < end; i++) {
intel_crtc->lut_r[i] = red[i] >> 8;
intel_crtc->lut_g[i] = green[i] >> 8;
intel_crtc->lut_b[i] = blue[i] >> 8;