Re: [PATCH v2] drm/core: Change declaration for gamma_set.

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On Tue, Jun 7, 2016 at 12:49 PM, Maarten Lankhorst
<maarten.lankhorst@xxxxxxxxxxxxxxx> wrote:
> Change return value to int to propagate errors from gamma_set,
> and remove start parameter. Updates always use the full size,
> and some drivers even ignore the start parameter altogether.
>
> This is needed for atomic drivers, where an atomic commit can
> fail with -EINTR or -ENOMEM and should be restarted.
>
> Changes since v1:
> - Fix compiler warning. (Emil)
> - Fix commit message (Daniel)
>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
> Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
> Cc: Eric Anholt <eric@xxxxxxxxxx>
> Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
> Cc: Mathieu Larouche <mathieu.larouche@xxxxxxxxxx>
> Cc: Thierry Reding <treding@xxxxxxxxxx>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c  | 10 ++++++----
>  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c  | 10 ++++++----
>  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c   | 10 ++++++----
>  drivers/gpu/drm/ast/ast_mode.c          | 10 ++++++----
>  drivers/gpu/drm/cirrus/cirrus_mode.c    |  8 +++++---
>  drivers/gpu/drm/drm_atomic_helper.c     | 13 ++++++-------
>  drivers/gpu/drm/drm_crtc.c              |  2 +-
>  drivers/gpu/drm/drm_fb_helper.c         |  2 +-
>  drivers/gpu/drm/gma500/gma_display.c    |  9 +++++----
>  drivers/gpu/drm/gma500/gma_display.h    |  4 ++--
>  drivers/gpu/drm/mgag200/mgag200_mode.c  |  9 +++++----
>  drivers/gpu/drm/nouveau/dispnv04/crtc.c | 12 +++++++-----
>  drivers/gpu/drm/nouveau/nv50_display.c  |  9 +++++----
>  drivers/gpu/drm/radeon/radeon_display.c | 11 +++++++----
>  drivers/gpu/drm/vc4/vc4_crtc.c          |  8 +++++---
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c     |  8 +++++---
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.h     |  4 ++--
>  include/drm/drm_atomic_helper.h         |  6 +++---
>  include/drm/drm_crtc.h                  |  4 ++--
>  19 files changed, 85 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> index 7e57447bf5f4..112e358f0f9b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> @@ -2667,19 +2667,21 @@ static void dce_v10_0_cursor_reset(struct drm_crtc *crtc)
>         }
>  }
>
> -static void dce_v10_0_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                   u16 *blue, uint32_t start, uint32_t size)
> +static int dce_v10_0_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                                   u16 *blue, uint32_t size)
>  {
>         struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
> -       int end = (start + size > 256) ? 256 : start + size, i;
> +       int i;
>
>         /* userspace palettes are always correct as is */
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 amdgpu_crtc->lut_r[i] = red[i] >> 6;
>                 amdgpu_crtc->lut_g[i] = green[i] >> 6;
>                 amdgpu_crtc->lut_b[i] = blue[i] >> 6;
>         }
>         dce_v10_0_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  static void dce_v10_0_crtc_destroy(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> index da101551960b..b522fa2435a8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
> @@ -2678,19 +2678,21 @@ static void dce_v11_0_cursor_reset(struct drm_crtc *crtc)
>         }
>  }
>
> -static void dce_v11_0_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                   u16 *blue, uint32_t start, uint32_t size)
> +static int dce_v11_0_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                                   u16 *blue, uint32_t size)
>  {
>         struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
> -       int end = (start + size > 256) ? 256 : start + size, i;
> +       int i;
>
>         /* userspace palettes are always correct as is */
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 amdgpu_crtc->lut_r[i] = red[i] >> 6;
>                 amdgpu_crtc->lut_g[i] = green[i] >> 6;
>                 amdgpu_crtc->lut_b[i] = blue[i] >> 6;
>         }
>         dce_v11_0_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  static void dce_v11_0_crtc_destroy(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> index 41d9bc5f9c0e..b50ed72feedb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
> @@ -2574,19 +2574,21 @@ static void dce_v8_0_cursor_reset(struct drm_crtc *crtc)
>         }
>  }
>
> -static void dce_v8_0_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                   u16 *blue, uint32_t start, uint32_t size)
> +static int dce_v8_0_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                                  u16 *blue, uint32_t size)
>  {
>         struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
> -       int end = (start + size > 256) ? 256 : start + size, i;
> +       int i;
>
>         /* userspace palettes are always correct as is */
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 amdgpu_crtc->lut_r[i] = red[i] >> 6;
>                 amdgpu_crtc->lut_g[i] = green[i] >> 6;
>                 amdgpu_crtc->lut_b[i] = blue[i] >> 6;
>         }
>         dce_v8_0_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  static void dce_v8_0_crtc_destroy(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
> index c337922606e3..5957c3e659fe 100644
> --- a/drivers/gpu/drm/ast/ast_mode.c
> +++ b/drivers/gpu/drm/ast/ast_mode.c
> @@ -624,19 +624,21 @@ static void ast_crtc_reset(struct drm_crtc *crtc)
>
>  }
>
> -static void ast_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                u16 *blue, uint32_t start, uint32_t size)
> +static int ast_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                             u16 *blue, uint32_t size)
>  {
>         struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
> -       int end = (start + size > 256) ? 256 : start + size, i;
> +       int i;
>
>         /* userspace palettes are always correct as is */
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 ast_crtc->lut_r[i] = red[i] >> 8;
>                 ast_crtc->lut_g[i] = green[i] >> 8;
>                 ast_crtc->lut_b[i] = blue[i] >> 8;
>         }
>         ast_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>
> diff --git a/drivers/gpu/drm/cirrus/cirrus_mode.c b/drivers/gpu/drm/cirrus/cirrus_mode.c
> index 0b1a411cb89e..17c915d9a03e 100644
> --- a/drivers/gpu/drm/cirrus/cirrus_mode.c
> +++ b/drivers/gpu/drm/cirrus/cirrus_mode.c
> @@ -325,18 +325,20 @@ static void cirrus_crtc_commit(struct drm_crtc *crtc)
>   * use this for 8-bit mode so can't perform smooth fades on deeper modes,
>   * but it's a requirement that we provide the function
>   */
> -static void cirrus_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                 u16 *blue, uint32_t start, uint32_t size)
> +static int cirrus_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                                u16 *blue, uint32_t size)
>  {
>         struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
>         int i;
>
> -       for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
> +       for (i = 0; i < size; i++) {
>                 cirrus_crtc->lut_r[i] = red[i];
>                 cirrus_crtc->lut_g[i] = green[i];
>                 cirrus_crtc->lut_b[i] = blue[i];
>         }
>         cirrus_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  /* Simple cleanup function */
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 4342f3dfc0e1..191d84f12e67 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -2920,16 +2920,15 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
>   * @red: red correction table
>   * @green: green correction table
>   * @blue: green correction table
> - * @start: first entry, must always be 0
>   * @size: size of the tables
>   *
>   * Implements support for legacy gamma correction table for drivers
>   * that support color management through the DEGAMMA_LUT/GAMMA_LUT
>   * properties.
>   */
> -void drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
> -                                       u16 *red, u16 *green, u16 *blue,
> -                                       uint32_t start, uint32_t size)
> +int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
> +                                      u16 *red, u16 *green, u16 *blue,
> +                                      uint32_t size)
>  {
>         struct drm_device *dev = crtc->dev;
>         struct drm_mode_config *config = &dev->mode_config;
> @@ -2941,7 +2940,7 @@ void drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
>
>         state = drm_atomic_state_alloc(crtc->dev);
>         if (!state)
> -               return;
> +               return -ENOMEM;
>
>         blob = drm_property_create_blob(dev,
>                                         sizeof(struct drm_color_lut) * size,
> @@ -2992,7 +2991,7 @@ retry:
>
>         drm_property_unreference_blob(blob);
>
> -       return;
> +       return 0;
>  fail:
>         if (ret == -EDEADLK)
>                 goto backoff;
> @@ -3000,7 +2999,7 @@ fail:
>         drm_atomic_state_free(state);
>         drm_property_unreference_blob(blob);
>
> -       return;
> +       return ret;
>  backoff:
>         drm_atomic_state_clear(state);
>         drm_atomic_legacy_backoff(state);
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index a9cabef98f6b..da2f28ea5fad 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -5171,7 +5171,7 @@ int drm_mode_gamma_set_ioctl(struct drm_device *dev,
>                 goto out;
>         }
>
> -       crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
> +       ret = crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size);
>
>  out:
>         drm_modeset_unlock_all(dev);
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 7590df5e2e72..58ed6e6d4f12 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -227,7 +227,7 @@ static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
>         g_base = r_base + crtc->gamma_size;
>         b_base = g_base + crtc->gamma_size;
>
> -       crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
> +       crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size);
>  }
>
>  /**
> diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c
> index c95406e6f44d..5b636bf0b467 100644
> --- a/drivers/gpu/drm/gma500/gma_display.c
> +++ b/drivers/gpu/drm/gma500/gma_display.c
> @@ -175,20 +175,21 @@ void gma_crtc_load_lut(struct drm_crtc *crtc)
>         }
>  }
>
> -void gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green, u16 *blue,
> -                       u32 start, u32 size)
> +int gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green, u16 *blue,
> +                      u32 size)
>  {
>         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
>         int i;
> -       int end = (start + size > 256) ? 256 : start + size;
>
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 gma_crtc->lut_r[i] = red[i] >> 8;
>                 gma_crtc->lut_g[i] = green[i] >> 8;
>                 gma_crtc->lut_b[i] = blue[i] >> 8;
>         }
>
>         gma_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  /**
> diff --git a/drivers/gpu/drm/gma500/gma_display.h b/drivers/gpu/drm/gma500/gma_display.h
> index b2491c65f053..e72dd08b701b 100644
> --- a/drivers/gpu/drm/gma500/gma_display.h
> +++ b/drivers/gpu/drm/gma500/gma_display.h
> @@ -72,8 +72,8 @@ extern int gma_crtc_cursor_set(struct drm_crtc *crtc,
>                                uint32_t width, uint32_t height);
>  extern int gma_crtc_cursor_move(struct drm_crtc *crtc, int x, int y);
>  extern void gma_crtc_load_lut(struct drm_crtc *crtc);
> -extern void gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                              u16 *blue, u32 start, u32 size);
> +extern int gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                             u16 *blue, u32 size);
>  extern void gma_crtc_dpms(struct drm_crtc *crtc, int mode);
>  extern void gma_crtc_prepare(struct drm_crtc *crtc);
>  extern void gma_crtc_commit(struct drm_crtc *crtc);
> diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
> index d347dca17267..6b21cb27e1cc 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_mode.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
> @@ -1352,19 +1352,20 @@ static void mga_crtc_commit(struct drm_crtc *crtc)
>   * use this for 8-bit mode so can't perform smooth fades on deeper modes,
>   * but it's a requirement that we provide the function
>   */
> -static void mga_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                 u16 *blue, uint32_t start, uint32_t size)
> +static int mga_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                             u16 *blue, uint32_t size)
>  {
>         struct mga_crtc *mga_crtc = to_mga_crtc(crtc);
> -       int end = (start + size > MGAG200_LUT_SIZE) ? MGAG200_LUT_SIZE : start + size;
>         int i;
>
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 mga_crtc->lut_r[i] = red[i] >> 8;
>                 mga_crtc->lut_g[i] = green[i] >> 8;
>                 mga_crtc->lut_b[i] = blue[i] >> 8;
>         }
>         mga_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  /* Simple cleanup function */
> diff --git a/drivers/gpu/drm/nouveau/dispnv04/crtc.c b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
> index 6f318c54da33..0cb7a18cde26 100644
> --- a/drivers/gpu/drm/nouveau/dispnv04/crtc.c
> +++ b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
> @@ -785,14 +785,14 @@ nv_crtc_disable(struct drm_crtc *crtc)
>         nouveau_bo_ref(NULL, &disp->image[nv_crtc->index]);
>  }
>
> -static void
> -nv_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b, uint32_t start,
> +static int
> +nv_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
>                   uint32_t size)
>  {
> -       int end = (start + size > 256) ? 256 : start + size, i;
>         struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
> +       int i;
>
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 nv_crtc->lut.r[i] = r[i];
>                 nv_crtc->lut.g[i] = g[i];
>                 nv_crtc->lut.b[i] = b[i];
> @@ -805,10 +805,12 @@ nv_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b, uint32_t start,
>          */
>         if (!nv_crtc->base.primary->fb) {
>                 nv_crtc->lut.depth = 0;
> -               return;
> +               return 0;
>         }
>
>         nv_crtc_gamma_load(crtc);
> +
> +       return 0;
>  }
>
>  static int
> diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
> index 3ffc2b0057bf..7a7788212df7 100644
> --- a/drivers/gpu/drm/nouveau/nv50_display.c
> +++ b/drivers/gpu/drm/nouveau/nv50_display.c
> @@ -1346,21 +1346,22 @@ nv50_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
>         return 0;
>  }
>
> -static void
> +static int
>  nv50_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
> -                   uint32_t start, uint32_t size)
> +                   uint32_t size)
>  {
>         struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
> -       u32 end = min_t(u32, start + size, 256);
>         u32 i;
>
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 nv_crtc->lut.r[i] = r[i];
>                 nv_crtc->lut.g[i] = g[i];
>                 nv_crtc->lut.b[i] = b[i];
>         }
>
>         nv50_crtc_lut_load(crtc);
> +
> +       return 0;
>  }
>
>  static void
> diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
> index 2fb18f13395c..e85c7a2f565b 100644
> --- a/drivers/gpu/drm/radeon/radeon_display.c
> +++ b/drivers/gpu/drm/radeon/radeon_display.c
> @@ -231,19 +231,21 @@ void radeon_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
>         *blue = radeon_crtc->lut_b[regno] << 6;
>  }
>
> -static void radeon_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> -                                 u16 *blue, uint32_t start, uint32_t size)
> +static int radeon_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> +                                u16 *blue, uint32_t size)
>  {
>         struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
> -       int end = (start + size > 256) ? 256 : start + size, i;
> +       int i;
>
>         /* userspace palettes are always correct as is */
> -       for (i = start; i < end; i++) {
> +       for (i = 0; i < size; i++) {
>                 radeon_crtc->lut_r[i] = red[i] >> 6;
>                 radeon_crtc->lut_g[i] = green[i] >> 6;
>                 radeon_crtc->lut_b[i] = blue[i] >> 6;
>         }
>         radeon_crtc_load_lut(crtc);
> +
> +       return 0;
>  }
>
>  static void radeon_crtc_destroy(struct drm_crtc *crtc)
> @@ -688,6 +690,7 @@ radeon_crtc_set_config(struct drm_mode_set *set)
>         pm_runtime_put_autosuspend(dev->dev);
>         return ret;
>  }
> +
>  static const struct drm_crtc_funcs radeon_crtc_funcs = {
>         .cursor_set2 = radeon_crtc_cursor_set2,
>         .cursor_move = radeon_crtc_cursor_move,
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index ba2e373ec901..4c0f26a644a3 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -175,20 +175,22 @@ vc4_crtc_lut_load(struct drm_crtc *crtc)
>                 HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
>  }
>
> -static void
> +static int
>  vc4_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
> -                  uint32_t start, uint32_t size)
> +                  uint32_t size)
>  {
>         struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
>         u32 i;
>
> -       for (i = start; i < start + size; i++) {
> +       for (i = 0; i < size; i++) {
>                 vc4_crtc->lut_r[i] = r[i] >> 8;
>                 vc4_crtc->lut_g[i] = g[i] >> 8;
>                 vc4_crtc->lut_b[i] = b[i] >> 8;
>         }
>
>         vc4_crtc_lut_load(crtc);
> +
> +       return 0;
>  }
>
>  static u32 vc4_get_fifo_full_level(u32 format)
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index 55231cce73a0..8a69d4da40b5 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -1404,9 +1404,9 @@ static int vmw_du_update_layout(struct vmw_private *dev_priv, unsigned num,
>         return 0;
>  }
>
> -void vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
> -                          u16 *r, u16 *g, u16 *b,
> -                          uint32_t start, uint32_t size)
> +int vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
> +                         u16 *r, u16 *g, u16 *b,
> +                         uint32_t size)
>  {
>         struct vmw_private *dev_priv = vmw_priv(crtc->dev);
>         int i;
> @@ -1418,6 +1418,8 @@ void vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
>                 vmw_write(dev_priv, SVGA_PALETTE_BASE + i * 3 + 1, g[i] >> 8);
>                 vmw_write(dev_priv, SVGA_PALETTE_BASE + i * 3 + 2, b[i] >> 8);
>         }
> +
> +       return 0;
>  }
>
>  int vmw_du_connector_dpms(struct drm_connector *connector, int mode)
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
> index 57203212c501..ff4803c107bc 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
> @@ -195,9 +195,9 @@ struct vmw_display_unit {
>  void vmw_du_cleanup(struct vmw_display_unit *du);
>  void vmw_du_crtc_save(struct drm_crtc *crtc);
>  void vmw_du_crtc_restore(struct drm_crtc *crtc);
> -void vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
> +int vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
>                            u16 *r, u16 *g, u16 *b,
> -                          uint32_t start, uint32_t size);
> +                          uint32_t size);
>  int vmw_du_crtc_cursor_set2(struct drm_crtc *crtc, struct drm_file *file_priv,
>                             uint32_t handle, uint32_t width, uint32_t height,
>                             int32_t hot_x, int32_t hot_y);
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index b03bd83703b4..1877a7c18d8e 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -147,9 +147,9 @@ void
>  __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
>  void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
>                                           struct drm_connector_state *state);
> -void drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
> -                                       u16 *red, u16 *green, u16 *blue,
> -                                       uint32_t start, uint32_t size);
> +int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
> +                                      u16 *red, u16 *green, u16 *blue,
> +                                      uint32_t size);
>
>  /**
>   * drm_atomic_crtc_for_each_plane - iterate over planes currently attached to CRTC
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index f59d8a2d8920..411be4f45506 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -479,8 +479,8 @@ struct drm_crtc_funcs {
>          * going on, which should eventually be unified to just one set of
>          * hooks.
>          */
> -       void (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
> -                         uint32_t start, uint32_t size);
> +       int (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
> +                        uint32_t size);
>
>         /**
>          * @destroy:
> --
> 2.5.5
>
>

Looks good

Acked-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
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