From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
On pre-HSW we have dedicated hardware for the RGB limited range
handling, and so we don't want to compress with the CSC matrix.
Toss in a FIXME about gamma LUT vs. limited range using the CSC.
Cc: Johnson Lin <johnson.lin@xxxxxxxxx>
Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_color.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index af1e61d3bacd..89ab0f70aa22 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -140,6 +140,14 @@ static void ilk_load_csc_matrix(struct drm_crtc_state *crtc_state)
int i, pipe = intel_crtc->pipe;
uint16_t coeffs[9] = { 0, };
struct intel_crtc_state *intel_crtc_state = to_intel_crtc_state(crtc_state);
+ bool limited_color_range = false;
+
+ /*
+ * FIXME if there's a gamma LUT after the CSC, we should
+ * do the range compression using the gamma LUT instead.
+ */
+ if (INTEL_GEN(dev_priv) >= 8 || IS_HASWELL(dev_priv))
+ limited_color_range = intel_crtc_state->limited_color_range;
if (intel_crtc_state->ycbcr420) {
ilk_load_ycbcr_conversion_matrix(intel_crtc);
@@ -150,7 +158,7 @@ static void ilk_load_csc_matrix(struct drm_crtc_state *crtc_state)
const u64 *input;
u64 temp[9];
- if (intel_crtc_state->limited_color_range)
+ if (limited_color_range)
input = ctm_mult_by_limited(temp, ctm->matrix);
else
input = ctm->matrix;
@@ -200,7 +208,7 @@ static void ilk_load_csc_matrix(struct drm_crtc_state *crtc_state)
* into consideration.
*/
for (i = 0; i < 3; i++) {
- if (intel_crtc_state->limited_color_range)
+ if (limited_color_range)
coeffs[i * 3 + i] =
ILK_CSC_COEFF_LIMITED_RANGE;
else
@@ -224,7 +232,7 @@ static void ilk_load_csc_matrix(struct drm_crtc_state *crtc_state)
if (INTEL_GEN(dev_priv) > 6) {
uint16_t postoff = 0;
- if (intel_crtc_state->limited_color_range)
+ if (limited_color_range)
postoff = (16 * (1 << 12) / 255) & 0x1fff;
I915_WRITE(PIPE_CSC_POSTOFF_HI(pipe), postoff);
@@ -235,7 +243,7 @@ static void ilk_load_csc_matrix(struct drm_crtc_state *crtc_state)
} else {
uint32_t mode = CSC_MODE_YUV_TO_RGB;
- if (intel_crtc_state->limited_color_range)
+ if (limited_color_range)
mode |= CSC_BLACK_SCREEN_OFFSET;
I915_WRITE(PIPE_CSC_MODE(pipe), mode);
--
2.16.1
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