--- /dev/null
+From 2a98dc34696c6510a49a684eb56d3a9c2a150571 Mon Sep 17 00:00:00 2001
+From: Boris Brezillon <boris.brezillon@bootlin.com>
+Date: Fri, 3 Aug 2018 11:22:29 +0200
+Subject: [PATCH] drm/vc4: Use drm_atomic_helper_check_plane_state() to
+ simplify the logic
+
+drm_atomic_helper_check_plane_state() takes care of checking the
+scaling capabilities and calculating the clipped X/Y offsets for us.
+
+Rely on this function instead of open-coding the logic.
+
+Incidentally, it seems to fix a problem we had with negative X/Y
+positioning of YUV planes.
+
+Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
+Reviewed-by: Eric Anholt <eric@anholt.net>
+Link: https://patchwork.freedesktop.org/patch/msgid/20180803092231.26446-3-boris.brezillon@bootlin.com
+---
+ drivers/gpu/drm/vc4/vc4_plane.c | 103 ++++++++++++++++----------------
+ 1 file changed, 52 insertions(+), 51 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_plane.c
++++ b/drivers/gpu/drm/vc4/vc4_plane.c
+@@ -313,31 +313,59 @@ static int vc4_plane_setup_clipping_and_
+ u32 subpixel_src_mask = (1 << 16) - 1;
+ u32 format = fb->format->format;
+ int num_planes = fb->format->num_planes;
+- u32 h_subsample = 1;
+- u32 v_subsample = 1;
+- int ret;
+- int i;
++ int min_scale = 1, max_scale = INT_MAX;
++ struct drm_crtc_state *crtc_state;
++ u32 h_subsample, v_subsample;
++ int i, ret;
++
++ crtc_state = drm_atomic_get_existing_crtc_state(state->state,
++ state->crtc);
++ if (!crtc_state) {
++ DRM_DEBUG_KMS("Invalid crtc state\n");
++ return -EINVAL;
++ }
++
++ /* No configuring scaling on the cursor plane, since it gets
++ * non-vblank-synced updates, and scaling requires LBM changes which
++ * have to be vblank-synced.
++ */
++ if (plane->type == DRM_PLANE_TYPE_CURSOR) {
++ min_scale = DRM_PLANE_HELPER_NO_SCALING;
++ max_scale = DRM_PLANE_HELPER_NO_SCALING;
++ } else {
++ min_scale = 1;
++ max_scale = INT_MAX;
++ }
++
++ ret = drm_atomic_helper_check_plane_state(state, crtc_state,
++ min_scale, max_scale,
++ true, true);
++ if (ret)
++ return ret;
++
++ h_subsample = drm_format_horz_chroma_subsampling(format);
++ v_subsample = drm_format_vert_chroma_subsampling(format);
+
+ for (i = 0; i < num_planes; i++)
+ vc4_state->offsets[i] = bo->paddr + fb->offsets[i];
+
+ /* We don't support subpixel source positioning for scaling. */
+- if ((state->src_x & subpixel_src_mask) ||
+- (state->src_y & subpixel_src_mask) ||
+- (state->src_w & subpixel_src_mask) ||
+- (state->src_h & subpixel_src_mask)) {
++ if ((state->src.x1 & subpixel_src_mask) ||
++ (state->src.x2 & subpixel_src_mask) ||
++ (state->src.y1 & subpixel_src_mask) ||
++ (state->src.y2 & subpixel_src_mask)) {
+ return -EINVAL;
+ }
+
+- vc4_state->src_x = state->src_x >> 16;
+- vc4_state->src_y = state->src_y >> 16;
+- vc4_state->src_w[0] = state->src_w >> 16;
+- vc4_state->src_h[0] = state->src_h >> 16;
+-
+- vc4_state->crtc_x = state->crtc_x;
+- vc4_state->crtc_y = state->crtc_y;
+- vc4_state->crtc_w = state->crtc_w;
+- vc4_state->crtc_h = state->crtc_h;
++ vc4_state->src_x = state->src.x1 >> 16;
++ vc4_state->src_y = state->src.y1 >> 16;
++ vc4_state->src_w[0] = (state->src.x2 - state->src.x1) >> 16;
++ vc4_state->src_h[0] = (state->src.y2 - state->src.y1) >> 16;
++
++ vc4_state->crtc_x = state->dst.x1;
++ vc4_state->crtc_y = state->dst.y1;
++ vc4_state->crtc_w = state->dst.x2 - state->dst.x1;
++ vc4_state->crtc_h = state->dst.y2 - state->dst.y1;
+
+ ret = vc4_plane_margins_adj(state);
+ if (ret)
+@@ -354,8 +382,6 @@ static int vc4_plane_setup_clipping_and_
+ if (num_planes > 1) {
+ vc4_state->is_yuv = true;
+
+- h_subsample = drm_format_horz_chroma_subsampling(format);
+- v_subsample = drm_format_vert_chroma_subsampling(format);
+ vc4_state->src_w[1] = vc4_state->src_w[0] / h_subsample;
+ vc4_state->src_h[1] = vc4_state->src_h[0] / v_subsample;
+
+@@ -380,39 +406,14 @@ static int vc4_plane_setup_clipping_and_
+ vc4_state->y_scaling[1] = VC4_SCALING_NONE;
+ }
+
+- /* No configuring scaling on the cursor plane, since it gets
+- non-vblank-synced updates, and scaling requires requires
+- LBM changes which have to be vblank-synced.
+- */
+- if (plane->type == DRM_PLANE_TYPE_CURSOR && !vc4_state->is_unity)
+- return -EINVAL;
+-
+- /* Clamp the on-screen start x/y to 0. The hardware doesn't
+- * support negative y, and negative x wastes bandwidth.
+- */
+- if (vc4_state->crtc_x < 0) {
+- for (i = 0; i < num_planes; i++) {
+- u32 cpp = fb->format->cpp[i];
+- u32 subs = ((i == 0) ? 1 : h_subsample);
+-
+- vc4_state->offsets[i] += (cpp *
+- (-vc4_state->crtc_x) / subs);
+- }
+- vc4_state->src_w[0] += vc4_state->crtc_x;
+- vc4_state->src_w[1] += vc4_state->crtc_x / h_subsample;
+- vc4_state->crtc_x = 0;
+- }
+-
+- if (vc4_state->crtc_y < 0) {
+- for (i = 0; i < num_planes; i++) {
+- u32 subs = ((i == 0) ? 1 : v_subsample);
+-
+- vc4_state->offsets[i] += (fb->pitches[i] *
+- (-vc4_state->crtc_y) / subs);
+- }
+- vc4_state->src_h[0] += vc4_state->crtc_y;
+- vc4_state->src_h[1] += vc4_state->crtc_y / v_subsample;
+- vc4_state->crtc_y = 0;
++ /* Adjust the base pointer to the first pixel to be scanned out. */
++ for (i = 0; i < num_planes; i++) {
++ vc4_state->offsets[i] += (vc4_state->src_y /
++ (i ? v_subsample : 1)) *
++ fb->pitches[i];
++ vc4_state->offsets[i] += (vc4_state->src_x /
++ (i ? h_subsample : 1)) *
++ fb->format->cpp[i];
+ }
+
+ return 0;
projects / openwrt / openwrt.git / blobdiff