Commit a835b784 authored by Mitul Golani's avatar Mitul Golani Committed by Ankit Nautiyal
Browse files

drm/dp: Add support to indicate if sink supports AS SDP 



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: default avatarMitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240322031157.3823909-2-mitulkumar.ajitkumar.golani@intel.com
parent c19278d6

drivers/gpu/drm/display/drm_dp_helper.c

+25 −0
Original line number Diff line number Diff line
@@ -2948,6 +2948,31 @@ 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

include/drm/display/drm_dp_helper.h

+1 −0
Original line number Diff line number Diff line
@@ -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]);