target/linux/bcm27xx/patches-5.10/950-0512-vc4-drm-vc4_plane-Remove-subpixel-positioning-check.patch

   1 From aa5ba5fd06cffacf4831fe6e9aef65081287924e Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Mon, 15 Mar 2021 13:28:06 +0000
   4 Subject: [PATCH] vc4/drm: vc4_plane: Remove subpixel positioning check
   5
   6 There is little harm in ignoring fractional coordinates
   7 (they just get truncated).
   8
   9 Without this:
  10 modetest -M vc4 -F tiles,gradient -s 32:1920x1080-60 -P89@74:1920x1080*.1.1@XR24
  11
  12 is rejected. We have the same issue in Kodi when trying to
  13 use zoom options on video.
  14
  15 Note: even if all coordinates are fully integer. e.g.
  16 src:[0,0,1920,1080] dest:[-10,-10,1940,1100]
  17
  18 it will still get rejected as drm_atomic_helper_check_plane_state
  19 uses drm_rect_clip_scaled which transforms this to fractional src coords
  20
  21 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
  22 ---
  23  drivers/gpu/drm/vc4/vc4_plane.c | 21 ++++++++-------------
  24  1 file changed, 8 insertions(+), 13 deletions(-)
  25
  26 --- a/drivers/gpu/drm/vc4/vc4_plane.c
  27 +++ b/drivers/gpu/drm/vc4/vc4_plane.c
  28 @@ -339,7 +339,6 @@ static int vc4_plane_setup_clipping_and_
  29         struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
  30         struct drm_framebuffer *fb = state->fb;
  31         struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
  32 -       u32 subpixel_src_mask = (1 << 16) - 1;
  33         int num_planes = fb->format->num_planes;
  34         struct drm_crtc_state *crtc_state;
  35         u32 h_subsample = fb->format->hsub;
  36 @@ -361,18 +360,14 @@ static int vc4_plane_setup_clipping_and_
  37         for (i = 0; i < num_planes; i++)
  38                 vc4_state->offsets[i] = bo->paddr + fb->offsets[i];
  39
  40 -       /* We don't support subpixel source positioning for scaling. */
  41 -       if ((state->src.x1 & subpixel_src_mask) ||
  42 -           (state->src.x2 & subpixel_src_mask) ||
  43 -           (state->src.y1 & subpixel_src_mask) ||
  44 -           (state->src.y2 & subpixel_src_mask)) {
  45 -               return -EINVAL;
  46 -       }
  47 -
  48 -       vc4_state->src_x = state->src.x1 >> 16;
  49 -       vc4_state->src_y = state->src.y1 >> 16;
  50 -       vc4_state->src_w[0] = (state->src.x2 - state->src.x1) >> 16;
  51 -       vc4_state->src_h[0] = (state->src.y2 - state->src.y1) >> 16;
  52 +       /* We don't support subpixel source positioning for scaling,
  53 +        * but fractional coordinates can be generated by clipping
  54 +        * so just round for now
  55 +        */
  56 +       vc4_state->src_x = DIV_ROUND_CLOSEST(state->src.x1, 1<<16);
  57 +       vc4_state->src_y = DIV_ROUND_CLOSEST(state->src.y1, 1<<16);
  58 +       vc4_state->src_w[0] = DIV_ROUND_CLOSEST(state->src.x2, 1<<16) - vc4_state->src_x;
  59 +       vc4_state->src_h[0] = DIV_ROUND_CLOSEST(state->src.y2, 1<<16) - vc4_state->src_y;
  60
  61         vc4_state->crtc_x = state->dst.x1;
  62         vc4_state->crtc_y = state->dst.y1;