[PATCH v12 1/8] drm/dp: Add support to indicate if sink supports AS SDP

[Nautiyal, Ankit K]

On 2/28/2024 8:08 PM, Mitul Golani wrote:
> Add an API that indicates support for Adaptive Sync SDP in
> the sink, which can be utilized by the rest of the DP programming.
>
> --v1:
> - Format commit message properly.
>
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>

LGTM.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

> ---
>   drivers/gpu/drm/display/drm_dp_helper.c | 25 +++++++++++++++++++++++++
>   include/drm/display/drm_dp_helper.h     |  1 +
>   2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
> index 9ac52cf5d4d8..f94c04db7187 100644
> --- a/drivers/gpu/drm/display/drm_dp_helper.c
> +++ b/drivers/gpu/drm/display/drm_dp_helper.c
> @@ -2913,6 +2913,31 @@ void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc)
>   }
>   EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
>   
> +/**
> + * drm_dp_as_sdp_supported() - check if adaptive sync sdp is supported
> + * @aux: DisplayPort AUX channel
> + * @dpcd: DisplayPort configuration data
> + *
> + * Returns true if adaptive sync sdp is supported, else returns false
> + */
> +bool drm_dp_as_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> +{
> +	u8 rx_feature;
> +
> +	if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_13)
> +		return false;
> +
> +	if (drm_dp_dpcd_readb(aux, DP_DPRX_FEATURE_ENUMERATION_LIST_CONT_1,
> +			      &rx_feature) != 1) {
> +		drm_dbg_dp(aux->drm_dev,
> +			   "Failed to read DP_DPRX_FEATURE_ENUMERATION_LIST_CONT_1\n");
> +		return false;
> +	}
> +
> +	return (rx_feature & DP_ADAPTIVE_SYNC_SDP_SUPPORTED);
> +}
> +EXPORT_SYMBOL(drm_dp_as_sdp_supported);
> +
>   /**
>    * drm_dp_vsc_sdp_supported() - check if vsc sdp is supported
>    * @aux: DisplayPort AUX channel
> diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
> index 0c1a4021e098..7c1aa3a703c8 100644
> --- a/include/drm/display/drm_dp_helper.h
> +++ b/include/drm/display/drm_dp_helper.h
> @@ -101,6 +101,7 @@ struct drm_dp_vsc_sdp {
>   void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc);
>   
>   bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
> +bool drm_dp_as_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
>   
>   int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]);
>