drm/i915: Add CRTC output format YCBCR 4:4:4

This patch adds support for YCBCR 4:4:4 CRTC output format.
To do this, this patch extends the existing YCBCR 4:2:0
framework by:
- Adding new parameter in for YCBCR 4:4:4 enum crtc_iutput_format.
- Adding case for YCBCR 4:4:4 in while setting AVI infoframes.
- Adding necessary checks in modeset sequence.

V3: Added this patch in the series
V4: Added r-b from Maarten (for v3)
    Addressed review comment from Ville:
    Do not use (config->output_format > CRTC_OUTPUT_RGB)
V5: Rebase
V6: Rebase and small change, to accommodate changes in patch 2
V7: Fixed checkpatch alignment warnings
V8: Rebase
V9: Rebase
V10: Rebase
V11: Addressed review comment from Ville
     Missing output_format_str[INTEL_OUTPUT_FORMAT_YCBCR444]
     Added Ville's R-B.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1539325394-20788-3-git-send-email-shashank.sharma@intel.com

drivers/gpu/drm/i915/intel_color.c

@@ -149,7 +149,8 @@ static void ilk_load_csc_matrix(struct drm_crtc_state *crtc_state)
 	if (INTEL_GEN(dev_priv) >= 8 || IS_HASWELL(dev_priv))
 		limited_color_range = intel_crtc_state->limited_color_range;
 
-	if (intel_crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420) {
+	if (intel_crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
+	    intel_crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444) {
 		ilk_load_ycbcr_conversion_matrix(intel_crtc);
 		return;
 	} else if (crtc_state->ctm) {

drivers/gpu/drm/i915/intel_display.c

@@ -6591,8 +6591,9 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
 		return -EINVAL;
 	}
 
-	if (pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 &&
-	    pipe_config->base.ctm) {
+	if ((pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
+	     pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR444) &&
+	     pipe_config->base.ctm) {
 		/*
 		 * There is only one pipe CSC unit per pipe, and we need that
 		 * for output conversion from RGB->YCBCR. So if CTM is already
@@ -7812,6 +7813,8 @@ static void intel_get_crtc_ycbcr_config(struct intel_crtc *crtc,
 					output = INTEL_OUTPUT_FORMAT_INVALID;
 				else
 					output = INTEL_OUTPUT_FORMAT_YCBCR420;
+			} else {
+				output = INTEL_OUTPUT_FORMAT_YCBCR444;
 			}
 		}
 	}
@@ -8453,11 +8456,13 @@ static void haswell_set_pipemisc(const struct intel_crtc_state *crtc_state)
 		if (crtc_state->dither)
 			val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
 
-		if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420) {
+		if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
+		    crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
 			val |= PIPEMISC_OUTPUT_COLORSPACE_YUV;
+
+		if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
 			val |= PIPEMISC_YUV420_ENABLE |
 				PIPEMISC_YUV420_MODE_FULL_BLEND;
-		}
 
 		I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
 	}
@@ -10940,6 +10945,7 @@ static const char * const output_format_str[] = {
 	[INTEL_OUTPUT_FORMAT_INVALID] = "Invalid",
 	[INTEL_OUTPUT_FORMAT_RGB] = "RGB",
 	[INTEL_OUTPUT_FORMAT_YCBCR420] = "YCBCR4:2:0",
+	[INTEL_OUTPUT_FORMAT_YCBCR444] = "YCBCR4:4:4",
 };
 
 static const char *output_formats(enum intel_output_format format)

drivers/gpu/drm/i915/intel_drv.h

@@ -716,6 +716,7 @@ enum intel_output_format {
 	INTEL_OUTPUT_FORMAT_INVALID,
 	INTEL_OUTPUT_FORMAT_RGB,
 	INTEL_OUTPUT_FORMAT_YCBCR420,
+	INTEL_OUTPUT_FORMAT_YCBCR444,
 };
 
 struct intel_crtc_state {

drivers/gpu/drm/i915/intel_hdmi.c

@@ -480,6 +480,8 @@ static void intel_hdmi_set_avi_infoframe(struct intel_encoder *encoder,
 
 	if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
 		frame.avi.colorspace = HDMI_COLORSPACE_YUV420;
+	else if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
+		frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
 	else
 		frame.avi.colorspace = HDMI_COLORSPACE_RGB;