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From aa5ba5fd06cffacf4831fe6e9aef65081287924e Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Mon, 15 Mar 2021 13:28:06 +0000
Subject: [PATCH] vc4/drm: vc4_plane: Remove subpixel positioning check
There is little harm in ignoring fractional coordinates
(they just get truncated).
Without this:
modetest -M vc4 -F tiles,gradient -s 32:1920x1080-60 -P89@74:1920x1080*.1.1@XR24
is rejected. We have the same issue in Kodi when trying to
use zoom options on video.
Note: even if all coordinates are fully integer. e.g.
src:[0,0,1920,1080] dest:[-10,-10,1940,1100]
it will still get rejected as drm_atomic_helper_check_plane_state
uses drm_rect_clip_scaled which transforms this to fractional src coords
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
drivers/gpu/drm/vc4/vc4_plane.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -339,7 +339,6 @@ static int vc4_plane_setup_clipping_and_
struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
struct drm_framebuffer *fb = state->fb;
struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
- u32 subpixel_src_mask = (1 << 16) - 1;
int num_planes = fb->format->num_planes;
struct drm_crtc_state *crtc_state;
u32 h_subsample = fb->format->hsub;
@@ -361,18 +360,14 @@ static int vc4_plane_setup_clipping_and_
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.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.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;
+ /* We don't support subpixel source positioning for scaling,
+ * but fractional coordinates can be generated by clipping
+ * so just round for now
+ */
+ vc4_state->src_x = DIV_ROUND_CLOSEST(state->src.x1, 1<<16);
+ vc4_state->src_y = DIV_ROUND_CLOSEST(state->src.y1, 1<<16);
+ vc4_state->src_w[0] = DIV_ROUND_CLOSEST(state->src.x2, 1<<16) - vc4_state->src_x;
+ vc4_state->src_h[0] = DIV_ROUND_CLOSEST(state->src.y2, 1<<16) - vc4_state->src_y;
vc4_state->crtc_x = state->dst.x1;
vc4_state->crtc_y = state->dst.y1;
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