Re: [PATCH 1/2] Revert "drm/amd/display: disable SubVP + DRR to prevent underflow"

[Rodrigo Siqueira Jordao <Rodrigo.Siqueira@amd.com>]

On 4/21/23 14:39, Aurabindo Pillai wrote:
> This reverts commit 541908cc2cca427fc3ae3bd4c9b82797a78e63a9.

Hi,

Please add an explanation of the reason why we want to revert this patch.

With that change:
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>

Thanks
Siqueira

> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c    | 5 -----
>   drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c | 4 ----
>   drivers/gpu/drm/amd/include/amd_shared.h             | 1 -
>   3 files changed, 10 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 e1565126ad2a..81206f67b993 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1645,11 +1645,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
>   	if (amdgpu_dc_feature_mask & DC_DISABLE_LTTPR_DP2_0)
>   		init_data.flags.allow_lttpr_non_transparent_mode.bits.DP2_0 = true;
>   
> -	/* Disable SubVP + DRR config by default */
> -	init_data.flags.disable_subvp_drr = true;
> -	if (amdgpu_dc_feature_mask & DC_ENABLE_SUBVP_DRR)
> -		init_data.flags.disable_subvp_drr = false;
> -
>   	init_data.flags.seamless_boot_edp_requested = false;
>   
>   	if (check_seamless_boot_capability(adev)) {
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
> index b8a2518faecc..d7749260e1d9 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
> @@ -880,10 +880,6 @@ static bool subvp_drr_schedulable(struct dc *dc, struct dc_state *context, struc
>   	int16_t stretched_drr_us = 0;
>   	int16_t drr_stretched_vblank_us = 0;
>   	int16_t max_vblank_mallregion = 0;
> -	const struct dc_config *config = &dc->config;
> -
> -	if (config->disable_subvp_drr)
> -		return false;
>   
>   	// Find SubVP pipe
>   	for (i = 0; i < dc->res_pool->pipe_count; i++) {
> diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
> index e4a22c68517d..f175e65b853a 100644
> --- a/drivers/gpu/drm/amd/include/amd_shared.h
> +++ b/drivers/gpu/drm/amd/include/amd_shared.h
> @@ -240,7 +240,6 @@ enum DC_FEATURE_MASK {
>   	DC_DISABLE_LTTPR_DP2_0 = (1 << 6), //0x40, disabled by default
>   	DC_PSR_ALLOW_SMU_OPT = (1 << 7), //0x80, disabled by default
>   	DC_PSR_ALLOW_MULTI_DISP_OPT = (1 << 8), //0x100, disabled by default
> -	DC_ENABLE_SUBVP_DRR = (1 << 9), // 0x200, disabled by default
>   };
>   
>   enum DC_DEBUG_MASK {