[PATCH v5 14/17] drm/i915: prepare pipe for YCBCR output

[Shashank Sharma <shashank.sharma@xxxxxxxxx>]

To get HDMI YCBCR420 output, the PIPEMISC register should be
programmed to:
- Generate YCBCR output (bit 11)
- In case of YCBCR420 outputs, it should be programmed in full
  blend mode to use the scaler in 5x3 ratio (bits 26 and 27)

This patch:
- Adds definition of these bits.
- Programs PIPEMISC for YCBCR outputs.

V2: rebase
V3: rebase
V4: rebase
V4: added r-b from Ander

Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Ander Conselvan de Oliveira <conselvan2@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>

Reviewed-by: Ander Conselvan de Oliveira <conselvan2@xxxxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_reg.h      |  3 +++
 drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 64cc674..5aea2a9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5227,6 +5227,9 @@ enum {
 
 #define _PIPE_MISC_A			0x70030
 #define _PIPE_MISC_B			0x71030
+#define   PIPEMISC_YCBCR420_ENABLE	(1<<27)
+#define   PIPEMISC_YCBCR420_MODE_BLEND	(1<<26)
+#define   PIPEMISC_OUTPUT_YCBCR		(1<<11)
 #define   PIPEMISC_DITHER_BPC_MASK	(7<<5)
 #define   PIPEMISC_DITHER_8_BPC		(0<<5)
 #define   PIPEMISC_DITHER_10_BPC	(1<<5)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ee1452e..3f87052 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8082,6 +8082,7 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	enum drm_hdmi_output_type hdmi_out = intel_crtc->config->hdmi_output;
 
 	if (IS_BROADWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 9) {
 		u32 val = 0;
@@ -8107,6 +8108,15 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
 		if (intel_crtc->config->dither)
 			val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
 
+		if (hdmi_out > DRM_HDMI_OUTPUT_DEFAULT_RGB) {
+			val |= PIPEMISC_OUTPUT_YCBCR;
+
+			if (hdmi_out == DRM_HDMI_OUTPUT_YCBCR420) {
+				val |= PIPEMISC_YCBCR420_ENABLE |
+				       PIPEMISC_YCBCR420_MODE_BLEND;
+			}
+		}
+
 		I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
 	}
 }
-- 
2.7.4

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