diff options
| author | Matthew Stewart <Matthew.Stewart2@amd.com> | 2026-06-24 16:34:03 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2026-07-14 19:12:35 -0400 |
| commit | ffa0cfa9d616aeea2adf182bda8e4dabc95f4531 (patch) | |
| tree | 36fdeff0996064a402899390b9154349180d0335 | |
| parent | 219fb1f4c5b91a58b2db55ff2fe2d06412e39888 (diff) | |
| download | linux-ffa0cfa9d616aeea2adf182bda8e4dabc95f4531.tar.gz linux-ffa0cfa9d616aeea2adf182bda8e4dabc95f4531.zip | |
drm/amd/display: Add passive dongle handling in force_to_use_aux case
[why]
Need special handling for passive HDMI dongles with I2C over AUX.
Reviewed-by: Aurabindo Pillai <Aurabindo.Pillai@amd.com>
Signed-off-by: Matthew Stewart <Matthew.Stewart2@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/link_detection.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c index 281a7c5acaca..2abe9d3a68d5 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c @@ -497,6 +497,12 @@ static void query_hdcp_capability(enum signal_type signal, struct dc_link *link) msg22.data = link->hdcp_caps.rx_caps.raw; msg22.length = sizeof(link->hdcp_caps.rx_caps.raw); msg22.msg_id = HDCP_MESSAGE_ID_RX_CAPS; + if (link->force_to_use_aux && (signal == SIGNAL_TYPE_HDMI_TYPE_A)) { + // case with passive dongle with i2c over aux + msg22.data = &link->hdcp_caps.rx_caps.fields.version; + msg22.length = sizeof(link->hdcp_caps.rx_caps.fields.version); + msg22.msg_id = HDCP_MESSAGE_ID_HDCP2VERSION; + } } else { msg22.data = &link->hdcp_caps.rx_caps.fields.version; msg22.length = sizeof(link->hdcp_caps.rx_caps.fields.version); @@ -597,7 +603,24 @@ static bool detect_dp(struct dc_link *link, if (sink_caps->transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) { sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT; if (!detect_dp_sink_caps(link)) { - return false; + if (link->force_to_use_aux) { + sink_caps->signal = dp_passive_dongle_detection(link->ddc, sink_caps, audio_support); + link->dpcd_caps.dongle_type = sink_caps->dongle_type; + link->dpcd_caps.is_dongle_type_one = sink_caps->is_dongle_type_one; + link->dpcd_caps.dpcd_rev.raw = 0; + /* Type 1 dongles do not work with I2C over Aux and also some of + * Type 2 dongles do not support I2C over Aux well, so for these + * cases when native Aux transactons fails and I2C over Aux fails + * report that nothing is connected, as we can't tell is it bad + * DP sink or bad passive dongle. + */ + if (sink_caps->dongle_type == DISPLAY_DONGLE_NONE) + return false; + else + return true; + } else { + return false; + } } if (is_dp_branch_device(link)) |