[Intel-gfx] [PATCH 10/11] drm/i915: Add NV12 to primary plane programming.

[Chandra Konduru]

This patch is adding NV12 support to skylake primary plane
programming. It is covering linear/X/Y/Yf tiling formats
for 0 and 180 rotations.

For 90/270 rotation, Y and UV subplanes should be treated
as separate surfaces and GTT remapping for rotation should
be done separately for each subplane. Once GEM adds support
for seperate remappings for two subplanes, 90/270 support
to be added to plane programming.

v2:
-Use regular int instead of 16.16 in aux_offset calculations (me)

Signed-off-by: Chandra Konduru <chandra.konduru at intel.com>
Testcase: igt/kms_nv12
---
 drivers/gpu/drm/i915/intel_atomic_plane.c |    2 ++
 drivers/gpu/drm/i915/intel_display.c      |   38 +++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index 86ba4b2..119439d 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -185,10 +185,12 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
 		 * 90/270 is not allowed with RGB64 16:16:16:16,
 		 * RGB 16-bit 5:6:5, and Indexed 8-bit.
 		 * TBD: Add RGB64 case once its added in supported format list.
+		 * TBD: Remove NV12, once its 90/270 remapping is supported
 		 */
 		switch (state->fb->pixel_format) {
 		case DRM_FORMAT_C8:
 		case DRM_FORMAT_RGB565:
+		case DRM_FORMAT_NV12:
 			DRM_DEBUG_KMS("Unsupported pixel format %s for 90/270!\n",
 					drm_get_format_name(state->fb->pixel_format));
 			return -EINVAL;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3ae646e..943a835 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3015,6 +3015,9 @@ u32 skl_plane_ctl_format(uint32_t pixel_format)
 	case DRM_FORMAT_VYUY:
 		plane_ctl_format = PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_VYUY;
 		break;
+	case DRM_FORMAT_NV12:
+		plane_ctl_format = PLANE_CTL_FORMAT_NV12;
+		break;
 	default:
 		BUG();
 	}
@@ -3085,6 +3088,8 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 	int src_x = 0, src_y = 0, src_w = 0, src_h = 0;
 	int dst_x = 0, dst_y = 0, dst_w = 0, dst_h = 0;
 	int scaler_id = -1;
+	u32 aux_dist = 0, aux_x_offset = 0, aux_y_offset = 0, aux_stride = 0;
+	u32 tile_row_adjustment = 0;
 
 	plane_state = to_intel_plane_state(plane->state);
 
@@ -3141,11 +3146,34 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 		x_offset = stride * tile_height - y - src_h;
 		y_offset = x;
 		plane_size = (src_w - 1) << 16 | (src_h - 1);
+		/*
+		 * TBD: For NV12 90/270 rotation, Y and UV subplanes should
+		 * be treated as separate surfaces and GTT remapping for
+		 * rotation should be done separately for each subplane.
+		 * Enable support once seperate remappings are available.
+		 */
 	} else {
 		stride = fb->pitches[0] / stride_div;
 		x_offset = x;
 		y_offset = y;
 		plane_size = (src_h - 1) << 16 | (src_w - 1);
+		tile_height = PAGE_SIZE / stride_div;
+
+		if (fb->pixel_format == DRM_FORMAT_NV12) {
+			int height_in_mem = (fb->offsets[1]/fb->pitches[0]);
+			/*
+			 * If UV starts from middle of a page, then UV start should
+			 * be programmed to beginning of that page. And offset into that
+			 * page to be programmed into y-offset
+			 */
+			tile_row_adjustment = height_in_mem % tile_height;
+			aux_dist = fb->pitches[0] * (height_in_mem - tile_row_adjustment);
+			aux_x_offset = DIV_ROUND_UP(x, 2);
+			aux_y_offset = DIV_ROUND_UP(y, 2) + tile_row_adjustment;
+			/* For tile-Yf, uv-subplane tile width is 2x of Y-subplane */
+			aux_stride = fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED ?
+				stride / 2 : stride;
+		}
 	}
 	plane_offset = y_offset << 16 | x_offset;
 
@@ -3153,11 +3181,14 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 	I915_WRITE(PLANE_OFFSET(pipe, 0), plane_offset);
 	I915_WRITE(PLANE_SIZE(pipe, 0), plane_size);
 	I915_WRITE(PLANE_STRIDE(pipe, 0), stride);
+	I915_WRITE(PLANE_AUX_DIST(pipe, 0), aux_dist | aux_stride);
+	I915_WRITE(PLANE_AUX_OFFSET(pipe, 0), aux_y_offset << 16 | aux_x_offset);
 
 	if (scaler_id >= 0) {
 		uint32_t ps_ctrl = 0;
 
 		WARN_ON(!dst_w || !dst_h);
+
 		ps_ctrl = PS_SCALER_EN | PS_PLANE_SEL(0) |
 			crtc_state->scaler_state.scalers[scaler_id].mode;
 		I915_WRITE(SKL_PS_CTRL(pipe, scaler_id), ps_ctrl);
@@ -3166,6 +3197,7 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 		I915_WRITE(SKL_PS_WIN_SZ(pipe, scaler_id), (dst_w << 16) | dst_h);
 		I915_WRITE(PLANE_POS(pipe, 0), 0);
 	} else {
+		WARN_ON(fb->pixel_format == DRM_FORMAT_NV12);
 		I915_WRITE(PLANE_POS(pipe, 0), (dst_y << 16) | dst_x);
 	}
 
@@ -13090,6 +13122,12 @@ intel_check_primary_plane(struct drm_plane *plane,
 			intel_crtc->atomic.update_wm = true;
 	}
 
+	/* Adjust (macro)pixel boundary */
+	if (fb && format_is_yuv(fb->pixel_format)) {
+		src->x1 &= ~0x10000;
+		src->x2 &= ~0x10000;
+	}
+
 	if (INTEL_INFO(dev)->gen >= 9) {
 		ret = skl_update_scaler_users(intel_crtc, crtc_state,
 			to_intel_plane(plane), state, 0);
-- 
1.7.9.5