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drm/i915: Turn off pipe CSC when it's not needed 

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>
Link: https://patchwork.freedesktop.org/patch/msgid/20190207202146.26423-6-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2019-02-07 22:21:44 +02:00
parent 0fc3f8e754
commit 0593d2cd38
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/i915/intel_color.c
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@ -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)