Re: [PATCH 2/2] amd/amdgpu_dm: Verify Gamma and Degamma LUT sizes using DRM Core check

[Sean Paul <seanpaul@chromium.org>]

On Wed, Oct 13, 2021 at 2:12 PM Mark Yacoub <markyacoub@chromium.org> wrote:
>
> From: Mark Yacoub <markyacoub@google.com>
>
> [Why]
> drm_atomic_helper_check_crtc now verifies both legacy and non-legacy LUT
> sizes. There is no need to check it within amdgpu_dm_atomic_check.
>
> [How]
> Remove the local call to verify LUT sizes and use DRM Core function
> instead.
>
> Tested on ChromeOS Zork.
>
> v1:
> Remove amdgpu_dm_verify_lut_sizes everywhere.
>

Reviewed-by: Sean Paul <seanpaul@chromium.org>

> Signed-off-by: Mark Yacoub <markyacoub@chromium.org>
> ---
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  8 ++---
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  1 -
>  .../amd/display/amdgpu_dm/amdgpu_dm_color.c   | 35 -------------------
>  3 files changed, 4 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index f74663b6b046e..47f8de1cfc3a5 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -10244,6 +10244,10 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
>                 }
>         }
>  #endif
> +       ret = drm_atomic_helper_check_crtcs(state);
> +       if (ret)
> +               return ret;
> +
>         for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
>                 dm_old_crtc_state = to_dm_crtc_state(old_crtc_state);
>
> @@ -10253,10 +10257,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
>                         dm_old_crtc_state->dsc_force_changed == false)
>                         continue;
>
> -               ret = amdgpu_dm_verify_lut_sizes(new_crtc_state);
> -               if (ret)
> -                       goto fail;
> -
>                 if (!new_crtc_state->enable)
>                         continue;
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> index fcb9c4a629c32..22730e5542092 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> @@ -617,7 +617,6 @@ void amdgpu_dm_trigger_timing_sync(struct drm_device *dev);
>  #define MAX_COLOR_LEGACY_LUT_ENTRIES 256
>
>  void amdgpu_dm_init_color_mod(void);
> -int amdgpu_dm_verify_lut_sizes(const struct drm_crtc_state *crtc_state);
>  int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc);
>  int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
>                                       struct dc_plane_state *dc_plane_state);
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> index a022e5bb30a5c..319f8a8a89835 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> @@ -284,37 +284,6 @@ static int __set_input_tf(struct dc_transfer_func *func,
>         return res ? 0 : -ENOMEM;
>  }
>
> -/**
> - * Verifies that the Degamma and Gamma LUTs attached to the |crtc_state| are of
> - * the expected size.
> - * Returns 0 on success.
> - */
> -int amdgpu_dm_verify_lut_sizes(const struct drm_crtc_state *crtc_state)
> -{
> -       const struct drm_color_lut *lut = NULL;
> -       uint32_t size = 0;
> -
> -       lut = __extract_blob_lut(crtc_state->degamma_lut, &size);
> -       if (lut && size != MAX_COLOR_LUT_ENTRIES) {
> -               DRM_DEBUG_DRIVER(
> -                       "Invalid Degamma LUT size. Should be %u but got %u.\n",
> -                       MAX_COLOR_LUT_ENTRIES, size);
> -               return -EINVAL;
> -       }
> -
> -       lut = __extract_blob_lut(crtc_state->gamma_lut, &size);
> -       if (lut && size != MAX_COLOR_LUT_ENTRIES &&
> -           size != MAX_COLOR_LEGACY_LUT_ENTRIES) {
> -               DRM_DEBUG_DRIVER(
> -                       "Invalid Gamma LUT size. Should be %u (or %u for legacy) but got %u.\n",
> -                       MAX_COLOR_LUT_ENTRIES, MAX_COLOR_LEGACY_LUT_ENTRIES,
> -                       size);
> -               return -EINVAL;
> -       }
> -
> -       return 0;
> -}
> -
>  /**
>   * amdgpu_dm_update_crtc_color_mgmt: Maps DRM color management to DC stream.
>   * @crtc: amdgpu_dm crtc state
> @@ -348,10 +317,6 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
>         bool is_legacy;
>         int r;
>
> -       r = amdgpu_dm_verify_lut_sizes(&crtc->base);
> -       if (r)
> -               return r;
> -
>         degamma_lut = __extract_blob_lut(crtc->base.degamma_lut, &degamma_size);
>         regamma_lut = __extract_blob_lut(crtc->base.gamma_lut, &regamma_size);
>
> --
> 2.33.0.882.g93a45727a2-goog
>