[PATCH v6 3/6] drm/i915: Add skl_check_nv12_surface for NV12

[Vidya Srinivas <vidya.srinivas@intel.com>]

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

We skip src trunction/adjustments for
NV12 case and handle the sizes directly.
Without this, pipe fifo underruns are seen on APL/KBL.

v2: For NV12, making the src coordinates multiplier of 4

v3: Moving all the src coords handling code for NV12
to skl_check_nv12_surface

v4: Added RB from Mika

v5: Rebased the series. Removed checks of mult of 4 in
skl_update_scaler, Added NV12 condition in intel_check_sprite_plane
where src x/w is being checked for mult of 2 for yuv planes.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 42 ++++++++++++++++++++++++++++++++++--
 drivers/gpu/drm/i915/intel_sprite.c  |  1 +
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 4279188..f1263e9 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3102,6 +3102,42 @@ static int skl_check_main_surface(const struct intel_crtc_state *crtc_state,
 	return 0;
 }
 
+static int
+skl_check_nv12_surface(const struct intel_crtc_state *crtc_state,
+		       struct intel_plane_state *plane_state)
+{
+	int crtc_x2 = plane_state->base.crtc_x + plane_state->base.crtc_w;
+	int crtc_y2 = plane_state->base.crtc_y + plane_state->base.crtc_h;
+
+	if (((plane_state->base.src_x >> 16) % 4) != 0 ||
+	    ((plane_state->base.src_y >> 16) % 4) != 0 ||
+	    ((plane_state->base.src_w >> 16) % 4) != 0 ||
+	    ((plane_state->base.src_h >> 16) % 4) != 0) {
+		DRM_DEBUG_KMS("src coords must be multiple of 4 for NV12\n");
+		return -EINVAL;
+	}
+
+	/* Clipping would cause a 1-3 pixel gap at the edge of the screen? */
+	if ((crtc_x2 > crtc_state->pipe_src_w && crtc_state->pipe_src_w % 4) ||
+	    (crtc_y2 > crtc_state->pipe_src_h && crtc_state->pipe_src_h % 4)) {
+		DRM_DEBUG_KMS("It's not possible to clip %u,%u to %u,%u\n",
+			      crtc_x2, crtc_y2,
+			      crtc_state->pipe_src_w, crtc_state->pipe_src_h);
+		return -EINVAL;
+	}
+
+	plane_state->base.src.x1 =
+		DIV_ROUND_CLOSEST(plane_state->base.src.x1, 1 << 18) << 18;
+	plane_state->base.src.x2 =
+		DIV_ROUND_CLOSEST(plane_state->base.src.x2, 1 << 18) << 18;
+	plane_state->base.src.y1 =
+		DIV_ROUND_CLOSEST(plane_state->base.src.y1, 1 << 18) << 18;
+	plane_state->base.src.y2 =
+		DIV_ROUND_CLOSEST(plane_state->base.src.y2, 1 << 18) << 18;
+
+	return 0;
+}
+
 static int skl_check_nv12_aux_surface(struct intel_plane_state *plane_state)
 {
 	const struct drm_framebuffer *fb = plane_state->base.fb;
@@ -3185,6 +3221,9 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
 	 * the main surface setup depends on it.
 	 */
 	if (fb->format->format == DRM_FORMAT_NV12) {
+		ret = skl_check_nv12_surface(crtc_state, plane_state);
+		if (ret)
+			return ret;
 		ret = skl_check_nv12_aux_surface(plane_state);
 		if (ret)
 			return ret;
@@ -4806,8 +4845,7 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
 	}
 
 	if (plane_scaler_check && pixel_format == DRM_FORMAT_NV12 &&
-	    (src_h < SKL_MIN_YUV_420_SRC_H || (src_w % 4) != 0 ||
-	     (src_h % 4) != 0)) {
+	    (src_h < SKL_MIN_YUV_420_SRC_H || src_w < SKL_MIN_YUV_420_SRC_W)) {
 		DRM_DEBUG_KMS("NV12: src dimensions not met\n");
 		return -EINVAL;
 	}
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 0c394a2..c73553a 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -1011,6 +1011,7 @@ intel_check_sprite_plane(struct intel_plane *plane,
 		src->y2 = (src_y + src_h) << 16;
 
 		if (intel_format_is_yuv(fb->format->format) &&
+		    fb->format->format != DRM_FORMAT_NV12 &&
 		    (src_x % 2 || src_w % 2)) {
 			DRM_DEBUG_KMS("src x/w (%u, %u) must be a multiple of 2 for YUV planes\n",
 				      src_x, src_w);
-- 
2.7.4

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