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drm/i915/dp: Handle the DOWNSTREAM_PORT_STATUS_CHANGED event

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Handle the DOWNSTREAM_PORT_STATUS_CHANGED event a branch device can use
to indicate the state change of a DFP connector on the branch device.
The event is signaled in the DP_LANE_ALIGN_STATUS_UPDATED DPCD register
setting a clear-on-read flag and triggering an HPD IRQ. Accordingly keep
a cached version of the flag, updating it whenever
DP_LANE_ALIGN_STATUS_UPDATED is read. Schedule a full connector
detection from the HPD IRQ handler if the cached flag is set and clear
the cached flag at the start of detection.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-7-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-02-25 18:46:04 +02:00
parent e55791f5b7
commit a6d89d46d3
2 changed files with 16 additions and 1 deletions
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1
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@ -1796,6 +1796,7 @@ struct intel_dp {
int link_rate;
u8 lane_count;
u8 sink_count;
bool downstream_port_changed;
bool needs_modeset_retry;
bool use_max_params;
u8 dpcd[DP_RECEIVER_CAP_SIZE];

16
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -5556,7 +5556,14 @@ intel_dp_read_link_status(struct intel_dp *intel_dp, u8 link_status[DP_LINK_STAT
err = drm_dp_dpcd_read_phy_link_status(&intel_dp->aux, DP_PHY_DPRX,
link_status);
return err;
if (err)
return err;
if (link_status[DP_LANE_ALIGN_STATUS_UPDATED - DP_LANE0_1_STATUS] &
DP_DOWNSTREAM_PORT_STATUS_CHANGED)
WRITE_ONCE(intel_dp->downstream_port_changed, true);
return 0;
}
static bool
@ -5876,6 +5883,11 @@ intel_dp_short_pulse(struct intel_dp *intel_dp)
intel_dp_check_link_state(intel_dp);
if (READ_ONCE(intel_dp->downstream_port_changed)) {
WRITE_ONCE(intel_dp->downstream_port_changed, false);
reprobe_needed = true;
}
intel_psr_short_pulse(intel_dp);
if (intel_alpm_get_error(intel_dp)) {
@ -5901,6 +5913,8 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
if (drm_WARN_ON(display->drm, intel_dp_is_edp(intel_dp)))
return connector_status_connected;
WRITE_ONCE(intel_dp->downstream_port_changed, false);
intel_lspcon_resume(dig_port);
if (!intel_dp_get_dpcd(intel_dp))