[PATCH 04/15] drm/i915: Stage scaler request for NV12 as src format

[Chandra Konduru <chandra.konduru@intel.com>]

This patch stages a scaler request when input format
is NV12. The same scaler does both chroma-upsampling
and resolution scaling as needed.

v2:
-Added helper function for need_scaling (Ville)

v3:
-Rebased to current kernel version 4.2.0.rc4 (me)

v4:
-minor updates (Ville)

v5:
-updated scaler helper function (Ville)

Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 356f071..cf6c31d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4345,20 +4345,33 @@ static void cpt_verify_modeset(struct drm_device *dev, int pipe)
 	}
 }
 
+static bool skl_need_scaling(int src_w, int src_h, int dst_w, int dst_h,
+	unsigned int rotation, uint32_t pixel_format)
+{
+	/* need a scaler for nv12 */
+	if (pixel_format == DRM_FORMAT_NV12)
+		return true;
+
+	/* need a scaler when sizes doesn't match */
+	if (intel_rotation_90_or_270(rotation))
+		return (src_h != dst_w || src_w != dst_h);
+	else
+		return (src_w != dst_w || src_h != dst_h);
+}
+
 static int
 skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
 		  unsigned scaler_user, int *scaler_id, unsigned int rotation,
-		  int src_w, int src_h, int dst_w, int dst_h)
+		  int src_w, int src_h, int dst_w, int dst_h, uint32_t pixel_format)
 {
 	struct intel_crtc_scaler_state *scaler_state =
 		&crtc_state->scaler_state;
 	struct intel_crtc *intel_crtc =
 		to_intel_crtc(crtc_state->base.crtc);
-	int need_scaling;
+	bool need_scaling;
 
-	need_scaling = intel_rotation_90_or_270(rotation) ?
-		(src_h != dst_w || src_w != dst_h):
-		(src_w != dst_w || src_h != dst_h);
+	need_scaling = skl_need_scaling(src_w, src_h, dst_w, dst_h, rotation,
+		pixel_format);
 
 	/*
 	 * if plane is being disabled or scaler is no more required or force detach
@@ -4427,7 +4440,7 @@ int skl_update_scaler_crtc(struct intel_crtc_state *state)
 	return skl_update_scaler(state, !state->base.active, SKL_CRTC_INDEX,
 		&state->scaler_state.scaler_id, DRM_ROTATE_0,
 		state->pipe_src_w, state->pipe_src_h,
-		adjusted_mode->hdisplay, adjusted_mode->vdisplay);
+		adjusted_mode->hdisplay, adjusted_mode->vdisplay, 0);
 }
 
 /**
@@ -4463,7 +4476,8 @@ static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
 				drm_rect_width(&plane_state->src) >> 16,
 				drm_rect_height(&plane_state->src) >> 16,
 				drm_rect_width(&plane_state->dst),
-				drm_rect_height(&plane_state->dst));
+				drm_rect_height(&plane_state->dst),
+				fb ? fb->pixel_format : 0);
 
 	if (ret || plane_state->scaler_id < 0)
 		return ret;
@@ -4488,6 +4502,7 @@ static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
 	case DRM_FORMAT_YVYU:
 	case DRM_FORMAT_UYVY:
 	case DRM_FORMAT_VYUY:
+	case DRM_FORMAT_NV12:
 		break;
 	default:
 		DRM_DEBUG_KMS("[PLANE:%d] FB:%d unsupported scaling format 0x%x\n",
-- 
1.7.9.5

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