[PATCH] drm/amd: Add debug mask for subviewport mclk switch

[Harry Wentland]

On 2022-06-28 17:26, Aurabindo Pillai wrote:
> [Why&How]
> Expose a new debugfs enum to force a subviewport memory clock switch
> to facilitate easy testing.
> 

Does this force a single switch? Or at regular intervals?

It would be useful to describe a bit better what it does.

> Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>

Either way, since this is for debug purposes only this is
Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +++
>  drivers/gpu/drm/amd/include/amd_shared.h          | 1 +
>  2 files changed, 4 insertions(+)
> 
> 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 c9145864ed2b..7a034ca95be2 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1559,6 +1559,9 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
>  	if (amdgpu_dc_debug_mask & DC_DISABLE_CLOCK_GATING)
>  		adev->dm.dc->debug.disable_clock_gate = true;
>  
> +	if (amdgpu_dc_debug_mask & DC_FORCE_SUBVP_MCLK_SWITCH)
> +		adev->dm.dc->debug.force_subvp_mclk_switch = true;
> +
>  	r = dm_dmub_hw_init(adev);
>  	if (r) {
>  		DRM_ERROR("DMUB interface failed to initialize: status=%d\n", r);
> diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
> index bcdf7453a403..b1c55dd7b498 100644
> --- a/drivers/gpu/drm/amd/include/amd_shared.h
> +++ b/drivers/gpu/drm/amd/include/amd_shared.h
> @@ -247,6 +247,7 @@ enum DC_DEBUG_MASK {
>  	DC_DISABLE_DSC = 0x4,
>  	DC_DISABLE_CLOCK_GATING = 0x8,
>  	DC_DISABLE_PSR = 0x10,
> +	DC_FORCE_SUBVP_MCLK_SWITCH = 0x20,
>  };
>  
>  enum amd_dpm_forced_level;