target/linux/brcm2708/patches-4.19/950-0663-drm-vc4-Fix-X-Y-positioning-of-planes-using-T_TILES-.patch

   1 From 010e3665babdf589e26e2fb098ac1f39e519c0f6 Mon Sep 17 00:00:00 2001
   2 From: Boris Brezillon <boris.brezillon@bootlin.com>
   3 Date: Fri, 3 Aug 2018 11:22:31 +0200
   4 Subject: [PATCH] drm/vc4: Fix X/Y positioning of planes using T_TILES
   5  modifier
   6
   7 X/Y positioning of T-format buffers is quite tricky and the current
   8 implementation was failing to position a plane using this format
   9 correctly when the CRTC X, Y or both X and Y offsets were negative.
  10 It was also failing when the SRC X/Y offsets were != 0.
  11
  12 Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
  13 Reviewed-by: Eric Anholt <eric@anholt.net>
  14 Link: https://patchwork.freedesktop.org/patch/msgid/20180803092231.26446-5-boris.brezillon@bootlin.com
  15 ---
  16  drivers/gpu/drm/vc4/vc4_plane.c | 50 ++++++++++++++++++++++++++++-----
  17  1 file changed, 43 insertions(+), 7 deletions(-)
  18
  19 --- a/drivers/gpu/drm/vc4/vc4_plane.c
  20 +++ b/drivers/gpu/drm/vc4/vc4_plane.c
  21 @@ -578,22 +578,58 @@ static int vc4_plane_mode_set(struct drm
  22                                                  (i ? h_subsample : 1) *
  23                                                  fb->format->cpp[i];
  24                 }
  25 +
  26                 break;
  27
  28         case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED: {
  29 -               /* For T-tiled, the FB pitch is "how many bytes from
  30 -                * one row to the next, such that pitch * tile_h ==
  31 -                * tile_size * tiles_per_row."
  32 -                */
  33                 u32 tile_size_shift = 12; /* T tiles are 4kb */
  34 +               /* Whole-tile offsets, mostly for setting the pitch. */
  35 +               u32 tile_w_shift = fb->format->cpp[0] == 2 ? 6 : 5;
  36                 u32 tile_h_shift = 5; /* 16 and 32bpp are 32 pixels high */
  37 +               u32 tile_w_mask = (1 << tile_w_shift) - 1;
  38 +               /* The height mask on 32-bit-per-pixel tiles is 63, i.e. twice
  39 +                * the height (in pixels) of a 4k tile.
  40 +                */
  41 +               u32 tile_h_mask = (2 << tile_h_shift) - 1;
  42 +               /* For T-tiled, the FB pitch is "how many bytes from one row to
  43 +                * the next, such that
  44 +                *
  45 +                *      pitch * tile_h == tile_size * tiles_per_row
  46 +                */
  47                 u32 tiles_w = fb->pitches[0] >> (tile_size_shift - tile_h_shift);
  48 +               u32 tiles_l = vc4_state->src_x >> tile_w_shift;
  49 +               u32 tiles_r = tiles_w - tiles_l;
  50 +               u32 tiles_t = vc4_state->src_y >> tile_h_shift;
  51 +               /* Intra-tile offsets, which modify the base address (the
  52 +                * SCALER_PITCH0_TILE_Y_OFFSET tells HVS how to walk from that
  53 +                * base address).
  54 +                */
  55 +               u32 tile_y = (vc4_state->src_y >> 4) & 1;
  56 +               u32 subtile_y = (vc4_state->src_y >> 2) & 3;
  57 +               u32 utile_y = vc4_state->src_y & 3;
  58 +               u32 x_off = vc4_state->src_x & tile_w_mask;
  59 +               u32 y_off = vc4_state->src_y & tile_h_mask;
  60
  61                 tiling = SCALER_CTL0_TILING_256B_OR_T;
  62 +               pitch0 = (VC4_SET_FIELD(x_off, SCALER_PITCH0_SINK_PIX) |
  63 +                         VC4_SET_FIELD(y_off, SCALER_PITCH0_TILE_Y_OFFSET) |
  64 +                         VC4_SET_FIELD(tiles_l, SCALER_PITCH0_TILE_WIDTH_L) |
  65 +                         VC4_SET_FIELD(tiles_r, SCALER_PITCH0_TILE_WIDTH_R));
  66 +               vc4_state->offsets[0] += tiles_t * (tiles_w << tile_size_shift);
  67 +               vc4_state->offsets[0] += subtile_y << 8;
  68 +               vc4_state->offsets[0] += utile_y << 4;
  69 +
  70 +               /* Rows of tiles alternate left-to-right and right-to-left. */
  71 +               if (tiles_t & 1) {
  72 +                       pitch0 |= SCALER_PITCH0_TILE_INITIAL_LINE_DIR;
  73 +                       vc4_state->offsets[0] += (tiles_w - tiles_l) <<
  74 +                                                tile_size_shift;
  75 +                       vc4_state->offsets[0] -= (1 + !tile_y) << 10;
  76 +               } else {
  77 +                       vc4_state->offsets[0] += tiles_l << tile_size_shift;
  78 +                       vc4_state->offsets[0] += tile_y << 10;
  79 +               }
  80
  81 -               pitch0 = (VC4_SET_FIELD(0, SCALER_PITCH0_TILE_Y_OFFSET) |
  82 -                         VC4_SET_FIELD(0, SCALER_PITCH0_TILE_WIDTH_L) |
  83 -                         VC4_SET_FIELD(tiles_w, SCALER_PITCH0_TILE_WIDTH_R));
  84                 break;
  85         }
  86