[PATCH v3 5/7] drm/i915: Turn off pipe CSC when it's not needed

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

As with pipe gamma we can avoid the potential precision loss from
the pipe csc unit when there is no need to use it. And again
we need the same logic for updating the planes.

v2: Rebase

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
---
 drivers/gpu/drm/i915/intel_color.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index c7030f682812..9720af3742f7 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -663,7 +663,8 @@ intel_color_add_affected_planes(struct intel_crtc_state *new_crtc_state)
 		intel_atomic_get_old_crtc_state(state, crtc);
 	struct intel_plane *plane;
 
-	if (new_crtc_state->gamma_enable == old_crtc_state->gamma_enable)
+	if (new_crtc_state->gamma_enable == old_crtc_state->gamma_enable &&
+	    new_crtc_state->csc_enable == old_crtc_state->csc_enable)
 		return 0;
 
 	for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
@@ -704,6 +705,7 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
 	const struct drm_property_blob *gamma_lut = crtc_state->base.gamma_lut;
 	const struct drm_property_blob *degamma_lut = crtc_state->base.degamma_lut;
+	bool limited_color_range = false;
 	int gamma_length, degamma_length;
 	u32 gamma_tests, degamma_tests;
 	int ret;
@@ -717,7 +719,11 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
 
 	if (INTEL_GEN(dev_priv) >= 9 ||
 	    IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
-		crtc_state->csc_enable = true;
+		limited_color_range = crtc_state->limited_color_range;
+
+	crtc_state->csc_enable =
+		crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB ||
+		crtc_state->base.ctm || limited_color_range;
 
 	ret = intel_color_add_affected_planes(crtc_state);
 	if (ret)
-- 
2.19.2

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