Re: [PATCH] drm/amd/display: Revert logic for plane modifiers

[Bas Nieuwenhuizen]

Please also add a

Cc: <stable@xxxxxxxxxxxxxxx> # 6.0.x

to ensure it gets backported.

On Fri, Oct 21, 2022 at 9:24 AM Joaquín Ignacio Aramendía
<samsagax@xxxxxxxxx> wrote:
>
> This file was split in commit 5d945cbcd4b16a29d6470a80dfb19738f9a4319f
> ("drm/amd/display: Create a file dedicated to planes") and the logic in
> dm_plane_format_mod_supported() function got changed by a switch logic.
> That change broke drm_plane modifiers setting on series 5000 APUs
> (tested on OXP mini AMD 5800U and HP Dev One 5850U PRO)
> leading to Gamescope not working as reported on GitHub[1]
>
> To reproduce the issue, enter a TTY and run:
>
> $ gamescope -- vkcube
>
> With said commit applied it will abort. This one restores the old logic,
> fixing the issue that affects Gamescope.
>
> [1](https://github.com/Plagman/gamescope/issues/624)
>
> Signed-off-by: Joaquín Ignacio Aramendía <samsagax@xxxxxxxxx>
> ---
>  .../amd/display/amdgpu_dm/amdgpu_dm_plane.c   | 51 +++----------------
>  1 file changed, 8 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
> index dfd3be49eac8..1d47d2d69781 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
> @@ -1369,7 +1369,8 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
>  {
>         struct amdgpu_device *adev = drm_to_adev(plane->dev);
>         const struct drm_format_info *info = drm_format_info(format);
> -       struct hw_asic_id asic_id = adev->dm.dc->ctx->asic_id;
> +

Can remove this newline.

With that removed, this patch is

Reviewed-by: Bas Nieuwenhuizen <bas@xxxxxxxxxxxxxxxxxxx>

Thanks,
Bas

> +       int i;
>
>         enum dm_micro_swizzle microtile = modifier_gfx9_swizzle_mode(modifier) & 3;
>
> @@ -1386,49 +1387,13 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
>                 return true;
>         }
>
> -       /* check if swizzle mode is supported by this version of DCN */
> -       switch (asic_id.chip_family) {
> -       case FAMILY_SI:
> -       case FAMILY_CI:
> -       case FAMILY_KV:
> -       case FAMILY_CZ:
> -       case FAMILY_VI:
> -               /* asics before AI does not have modifier support */
> -               return false;
> -       case FAMILY_AI:
> -       case FAMILY_RV:
> -       case FAMILY_NV:
> -       case FAMILY_VGH:
> -       case FAMILY_YELLOW_CARP:
> -       case AMDGPU_FAMILY_GC_10_3_6:
> -       case AMDGPU_FAMILY_GC_10_3_7:
> -               switch (AMD_FMT_MOD_GET(TILE, modifier)) {
> -               case AMD_FMT_MOD_TILE_GFX9_64K_R_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_D_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_S_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_D:
> -                       return true;
> -               default:
> -                       return false;
> -               }
> -               break;
> -       case AMDGPU_FAMILY_GC_11_0_0:
> -       case AMDGPU_FAMILY_GC_11_0_1:
> -               switch (AMD_FMT_MOD_GET(TILE, modifier)) {
> -               case AMD_FMT_MOD_TILE_GFX11_256K_R_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_R_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_D_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_S_X:
> -               case AMD_FMT_MOD_TILE_GFX9_64K_D:
> -                       return true;
> -               default:
> -                       return false;
> -               }
> -               break;
> -       default:
> -               ASSERT(0); /* Unknown asic */
> -               break;
> +       /* Check that the modifier is on the list of the plane's supported modifiers. */
> +       for (i = 0; i < plane->modifier_count; i++) {
> +               if (modifier == plane->modifiers[i])
> +                       break;
>         }
> +       if (i == plane->modifier_count)
> +               return false;
>
>         /*
>          * For D swizzle the canonical modifier depends on the bpp, so check
> --
> 2.38.1
>