[PATCH v3 1/3] drm/amd/display: Add module parameter for freesync video mode

[Alex Deucher]

On Mon, Dec 14, 2020 at 5:21 PM Aurabindo Pillai
<aurabindo.pillai at amd.com> wrote:
>
> [Why&How]
> Adds a module parameter to enable experimental freesync video mode modeset
> optimization. Enabling this mode allows the driver to skip a full modeset when
> freesync compatible modes are requested by the userspace. This paramters also
> adds some standard modes based on the connected monitor's VRR range.
>
> Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
> Acked-by: Christian König <christian.koenig at amd.com>
> Reviewed-by: Shashank Sharma <shashank.sharma at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h     |  1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 ++++++++++++
>  2 files changed, 13 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index eed5410947e9..e0942184efdd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -177,6 +177,7 @@ extern int amdgpu_gpu_recovery;
>  extern int amdgpu_emu_mode;
>  extern uint amdgpu_smu_memory_pool_size;
>  extern uint amdgpu_dc_feature_mask;
> +extern uint amdgpu_exp_freesync_vid_mode;
>  extern uint amdgpu_dc_debug_mask;
>  extern uint amdgpu_dm_abm_level;
>  extern struct amdgpu_mgpu_info mgpu_info;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index b2a1dd7581bf..ece51ecd53d1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -158,6 +158,7 @@ int amdgpu_mes;
>  int amdgpu_noretry = -1;
>  int amdgpu_force_asic_type = -1;
>  int amdgpu_tmz;
> +uint amdgpu_exp_freesync_vid_mode;
>  int amdgpu_reset_method = -1; /* auto */
>  int amdgpu_num_kcq = -1;
>
> @@ -786,6 +787,17 @@ module_param_named(abmlevel, amdgpu_dm_abm_level, uint, 0444);
>  MODULE_PARM_DESC(tmz, "Enable TMZ feature (-1 = auto, 0 = off (default), 1 = on)");
>  module_param_named(tmz, amdgpu_tmz, int, 0444);
>
> +/**
> + * DOC: experimental_freesync_video (uint)
> + * Enabled the optimization to adjust front porch timing to achieve seamless mode change experience
> + * when setting a freesync supported mode for which full modeset is not needed.
> + * The default value: 0 (off).
> + */
> +MODULE_PARM_DESC(
> +       experimental_freesync_video,
> +       "Enable freesync modesetting optimization feature (0 = off (default), 1 = on)");

Maybe just call this freesync_video so that we can change the default
if we decide to at some point.

Alex

> +module_param_named(experimental_freesync_video, amdgpu_exp_freesync_vid_mode, uint, 0444);
> +
>  /**
>   * DOC: reset_method (int)
>   * GPU reset method (-1 = auto (default), 0 = legacy, 1 = mode0, 2 = mode1, 3 = mode2, 4 = baco)
> --
> 2.29.2
>
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