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| author | Mitul Golani <mitulkumar.ajitkumar.golani@intel.com> | 2024-03-22 06:11:49 +0300 |
|---|---|---|
| committer | Ankit Nautiyal <ankit.k.nautiyal@intel.com> | 2024-04-04 10:38:45 +0300 |
| commit | a835b784ba1a4514434f619fad2a0f9f1bf72d62 (patch) | |
| tree | 17b5a3384417dac3f85da2091ce698a394faa7c8 /drivers/gpu/drm/display/drm_dp_helper.c | |
| parent | c19278d6fb9d710995c63a0c9e3f91f2edfa2427 (diff) | |
| download | linux-a835b784ba1a4514434f619fad2a0f9f1bf72d62.tar.xz | |
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: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240322031157.3823909-2-mitulkumar.ajitkumar.golani@intel.com
Diffstat (limited to 'drivers/gpu/drm/display/drm_dp_helper.c')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_helper.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index f5d4be897866..5d7c6bab8e33 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2949,6 +2949,31 @@ 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 * @dpcd: DisplayPort configuration data |