[PATCH 1/2] drm/amdgpu: Add stutter mode ctrl in module parameter

[Alex Deucher]

On Wed, Jun 27, 2018 at 6:25 AM, rex zhu <rex.zhu at amd.com> wrote:
> Enable stutter mode can save power in low DRAM use cases
> including but not limited to productivity application use,
> web browsing, and video playback.
>
> Currently this feature is disabled by default.
>
> Make bit 17 in module parameter amdgpu_pp_feature_mask
> as stutter mode mask, so user can enable/disable this feature easily.
>
> Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 3 ++-
>  drivers/gpu/drm/amd/include/amd_shared.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 6841497..dcdc97d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -122,7 +122,8 @@
>  uint amdgpu_sdma_phase_quantum = 32;
>  char *amdgpu_disable_cu = NULL;
>  char *amdgpu_virtual_display = NULL;
> -uint amdgpu_pp_feature_mask = 0xffff3fff; /* gfxoff (bit 15) disabled by default */
> +/* OverDrive(bit 14),gfxoff(bit 15),stutter mode(bit 17) disabled by default*/
> +uint amdgpu_pp_feature_mask = 0xfffd3fff;
>  int amdgpu_ngg = 0;
>  int amdgpu_prim_buf_per_se = 0;
>  int amdgpu_pos_buf_per_se = 0;
> diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
> index b178176..d6f4874 100644
> --- a/drivers/gpu/drm/amd/include/amd_shared.h
> +++ b/drivers/gpu/drm/amd/include/amd_shared.h
> @@ -128,6 +128,7 @@ enum PP_FEATURE_MASK {
>         PP_OVERDRIVE_MASK = 0x4000,
>         PP_GFXOFF_MASK = 0x8000,
>         PP_ACG_MASK = 0x10000,
> +       PP_STUTTER_MODE = 0x20000,
>  };
>
>  struct amd_ip_funcs {
> --
> 1.9.1
>
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