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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
This commit is contained in:
Boris Brezillon 2018-08-03 11:22:29 +02:00
parent 91b6da23cc
commit 58a6a36fe8
1 changed files with 52 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
drivers/gpu/drm/vc4/vc4_plane.c
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@ -266,30 +266,59 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
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 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->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->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->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;
vc4_state->x_scaling[0] = vc4_get_scaling_mode(vc4_state->src_w[0],
vc4_state->crtc_w);
@ -302,8 +331,6 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
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;
@ -325,39 +352,14 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
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;