[PATCH 30/31] drm/vc4: Move the buffer offset out of the vc4_plane_state

[Dave Stevenson <dave.stevenson@raspberrypi.com>]

The offset fields in vc4_plane_state are described as being
the offset for each buffer in the bo, however it is used to
store the complete DMA address that is then written into the
register.

The DMA address including the fb ofset  can be retrieved
using drm_fb_dma_get_gem_addr, and the offset adjustment due to
clipping is local to vc4_plane_mode_set.
Drop the offset field from the state, and compute the complete
DMA address in vc4_plane_mode_set.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_drv.h   |  5 ----
 drivers/gpu/drm/vc4/vc4_plane.c | 51 +++++++++++++--------------------
 2 files changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 7a9faea748e6..c6be1997f1c7 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -421,11 +421,6 @@ struct vc4_plane_state {
 	bool is_unity;
 	bool is_yuv;
 
-	/* Offset to start scanning out from the start of the plane's
-	 * BO.
-	 */
-	u32 offsets[3];
-
 	/* Our allocation in LBM for temporary storage during scaling. */
 	struct drm_mm_node lbm;
 
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 4c61ef4f4142..ba6e86d62a77 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -450,12 +450,11 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
 {
 	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
 	struct drm_framebuffer *fb = state->fb;
-	struct drm_gem_dma_object *bo;
 	int num_planes = fb->format->num_planes;
 	struct drm_crtc_state *crtc_state;
 	u32 h_subsample = fb->format->hsub;
 	u32 v_subsample = fb->format->vsub;
-	int i, ret;
+	int ret;
 
 	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
 							state->crtc);
@@ -469,11 +468,6 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
 	if (ret)
 		return ret;
 
-	for (i = 0; i < num_planes; i++) {
-		bo = drm_fb_dma_get_gem_obj(fb, i);
-		vc4_state->offsets[i] = bo->dma_addr + fb->offsets[i];
-	}
-
 	vc4_state->src_x = state->src.x1;
 	vc4_state->src_y = state->src.y1;
 	vc4_state->src_w[0] = state->src.x2 - vc4_state->src_x;
@@ -902,6 +896,7 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 	u32 width, height;
 	u32 hvs_format = format->hvs;
 	unsigned int rotation;
+	u32 offsets[3] = { 0 };
 	int ret, i;
 
 	if (vc4_state->dlist_initialized)
@@ -949,13 +944,8 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 		 * out.
 		 */
 		for (i = 0; i < num_planes; i++) {
-			vc4_state->offsets[i] += src_y /
-						 (i ? v_subsample : 1) *
-						 fb->pitches[i];
-
-			vc4_state->offsets[i] += src_x /
-						 (i ? h_subsample : 1) *
-						 fb->format->cpp[i];
+			offsets[i] += src_y / (i ? v_subsample : 1) * fb->pitches[i];
+			offsets[i] += src_x / (i ? h_subsample : 1) * fb->format->cpp[i];
 		}
 
 		break;
@@ -1010,19 +1000,18 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 			   VC4_SET_FIELD(y_off, SCALER_PITCH0_TILE_Y_OFFSET) |
 			   VC4_SET_FIELD(tiles_l, SCALER_PITCH0_TILE_WIDTH_L) |
 			   VC4_SET_FIELD(tiles_r, SCALER_PITCH0_TILE_WIDTH_R));
-		vc4_state->offsets[0] += tiles_t * (tiles_w << tile_size_shift);
-		vc4_state->offsets[0] += subtile_y << 8;
-		vc4_state->offsets[0] += utile_y << 4;
+		offsets[0] += tiles_t * (tiles_w << tile_size_shift);
+		offsets[0] += subtile_y << 8;
+		offsets[0] += utile_y << 4;
 
 		/* Rows of tiles alternate left-to-right and right-to-left. */
 		if (tiles_t & 1) {
 			pitch0 |= SCALER_PITCH0_TILE_INITIAL_LINE_DIR;
-			vc4_state->offsets[0] += (tiles_w - tiles_l) <<
-						 tile_size_shift;
-			vc4_state->offsets[0] -= (1 + !tile_y) << 10;
+			offsets[0] += (tiles_w - tiles_l) << tile_size_shift;
+			offsets[0] -= (1 + !tile_y) << 10;
 		} else {
-			vc4_state->offsets[0] += tiles_l << tile_size_shift;
-			vc4_state->offsets[0] += tile_y << 10;
+			offsets[0] += tiles_l << tile_size_shift;
+			offsets[0] += tile_y << 10;
 		}
 
 		break;
@@ -1111,11 +1100,9 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 
 			tile = src_x / pix_per_tile;
 
-			vc4_state->offsets[i] += param * tile_w * tile;
-			vc4_state->offsets[i] += src_y /
-						 (i ? v_subsample : 1) *
-						 tile_w;
-			vc4_state->offsets[i] += x_off & ~(i ? 1 : 0);
+			offsets[i] += param * tile_w * tile;
+			offsets[i] += src_y / (i ? v_subsample : 1) * tile_w;
+			offsets[i] += x_off & ~(i ? 1 : 0);
 		}
 
 		pitch0 = VC4_SET_FIELD(param, SCALER_TILE_HEIGHT);
@@ -1261,8 +1248,12 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 	 * The pointers may be any byte address.
 	 */
 	vc4_state->ptr0_offset[0] = vc4_state->dlist_count;
-	for (i = 0; i < num_planes; i++)
-		vc4_dlist_write(vc4_state, vc4_state->offsets[i]);
+
+	for (i = 0; i < num_planes; i++) {
+		struct drm_gem_dma_object *bo = drm_fb_dma_get_gem_obj(fb, i);
+
+		vc4_dlist_write(vc4_state, bo->dma_addr + fb->offsets[i] + offsets[i]);
+	}
 
 	/* Pointer Context Word 0/1/2: Written by the HVS */
 	for (i = 0; i < num_planes; i++)
@@ -1525,8 +1516,6 @@ static void vc4_plane_atomic_async_update(struct drm_plane *plane,
 	       sizeof(vc4_state->y_scaling));
 	vc4_state->is_unity = new_vc4_state->is_unity;
 	vc4_state->is_yuv = new_vc4_state->is_yuv;
-	memcpy(vc4_state->offsets, new_vc4_state->offsets,
-	       sizeof(vc4_state->offsets));
 	vc4_state->needs_bg_fill = new_vc4_state->needs_bg_fill;
 
 	/* Update the current vc4_state pos0, pos2 and ptr0 dlist entries. */
-- 
2.34.1