[Intel-gfx] [PATCH 03/15] drm/i915: Set scaler mode for NV12

[Chandra Konduru]

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

v2:
- new reg defines squashed into patches used them (Ville)

Signed-off-by: Chandra Konduru <chandra.konduru at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h     |    1 +
 drivers/gpu/drm/i915/intel_atomic.c |    5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1fa0554..825d721 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5498,6 +5498,7 @@ enum skl_disp_power_wells {
 #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 9336e80..fd3972c 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -247,7 +247,10 @@ int intel_atomic_setup_scalers(struct drm_device *dev,
 		}
 
 		/* set scaler mode */
-		if (num_scalers_need == 1 && intel_crtc->pipe != PIPE_C) {
+		if (plane_state && plane_state->base.fb &&
+			plane_state->base.fb->pixel_format == DRM_FORMAT_NV12) {
+			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,
 			 * scaler 0 operates in high quality (HQ) mode.
-- 
1.7.9.5