[Intel-gfx] [PATCH 06/11] drm/i915: Set scaler mode for NV12

[Vidya Srinivas]

From: Chandra Konduru <chandra.konduru at intel.com>

This patch sets appropriate scaler mode for NV12 format.
In this mode, skylake scaler does either chroma-upsampling or
chroma-upsampling and resolution scaling

Link: https://patchwork.kernel.org/patch/6426161/
Signed-off-by: Chandra Konduru <chandra.konduru at intel.com>
Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti at intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h     | 1 +
 drivers/gpu/drm/i915/intel_atomic.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ad600f4..627ed7c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6189,6 +6189,7 @@ enum {
 #define PS_SCALER_MODE_MASK (3 << 28)
 #define PS_SCALER_MODE_DYN  (0 << 28)
 #define PS_SCALER_MODE_HQ  (1 << 28)
+#define PS_SCALER_MODE_NV12 (2 << 28)
 #define PS_PLANE_SEL_MASK  (7 << 25)
 #define PS_PLANE_SEL(plane) (((plane) + 1) << 25)
 #define PS_FILTER_MASK         (3 << 23)
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index d791b3e..2fa07bb 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -327,6 +327,12 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
 		/* set scaler mode */
 		if (IS_GEMINILAKE(dev_priv)) {
 			scaler_state->scalers[*scaler_id].mode = 0;
+		} else if (plane_state && plane_state->base.fb &&
+			plane_state->base.fb->format->format ==
+			DRM_FORMAT_NV12) {
+			DRM_ERROR("NV12 format setting scaler mode\n");
+			scaler_state->scalers[*scaler_id].mode =
+				PS_SCALER_MODE_NV12;
 		} else if (num_scalers_need == 1 && intel_crtc->pipe != PIPE_C) {
 			/*
 			 * when only 1 scaler is in use on either pipe A or B,
-- 
1.9.1