drm/i915: Readout and check csc_mode

Add the missing readout and PIPE_CONF_CHECK() for csc_mode.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190218193137.22914-2-ville.syrjala@linux.intel.comReviewed-by: Uma Shankar <uma.shankar@intel.com>

drivers/gpu/drm/i915/intel_color.c

@@ -788,6 +788,8 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
 	if (ret)
 		return ret;
 
+	crtc_state->csc_mode = 0;
+
 	/* Always allow legacy gamma LUT with no further checking. */
 	if (!crtc_state->gamma_enable ||
 	    crtc_state_is_legacy_gamma(crtc_state)) {
@@ -814,8 +816,6 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
 	else
 		crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
 
-	crtc_state->csc_mode = 0;
-
 	if (INTEL_GEN(dev_priv) >= 11) {
 		if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
 		    crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)

drivers/gpu/drm/i915/intel_display.c

@@ -9288,6 +9288,8 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
 	pipe_config->gamma_mode = (tmp & PIPECONF_GAMMA_MODE_MASK_ILK) >>
 		PIPECONF_GAMMA_MODE_SHIFT;
 
+	pipe_config->csc_mode = I915_READ(PIPE_CSC_MODE(crtc->pipe));
+
 	i9xx_get_pipe_color_config(pipe_config);
 
 	if (I915_READ(PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
@@ -9923,6 +9925,8 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 
 	pipe_config->gamma_mode = I915_READ(GAMMA_MODE(crtc->pipe));
 
+	pipe_config->csc_mode = I915_READ(PIPE_CSC_MODE(crtc->pipe));
+
 	if (INTEL_GEN(dev_priv) >= 9) {
 		u32 tmp = I915_READ(SKL_BOTTOM_COLOR(crtc->pipe));
 
@@ -12234,6 +12238,7 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
 		PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);
 
 		PIPE_CONF_CHECK_X(gamma_mode);
+		PIPE_CONF_CHECK_X(csc_mode);
 		PIPE_CONF_CHECK_BOOL(gamma_enable);
 		PIPE_CONF_CHECK_BOOL(csc_enable);
 	}