disp: msm: dp: skip dp disconnect if already in progress

When dp disconnect is triggered, as part of the teardown process, the
driver sends a notification to audio driver and waits for the audio
driver to complete before proceeding. When back to back disconnects
are triggered currently there is no check if a disconnect is already
in progress. So the driver ends up reinitializing the signal
completion that the previous disconnect thread is waiting on causing
this issue.

This change adds a check at the beginning of disconnect handling and
bail out if a disconnect is already in progress.

Change-Id: I2eaee339408d9dbc120f8efc14d86fca0ebb0758
Signed-off-by: Rajkumar Subbiah <[email protected]>

msm/dp/dp_display.c

@@ -1335,6 +1335,13 @@ static int dp_display_usbpd_disconnect_cb(struct device *dev)
 	SDE_EVT32_EXTERNAL(SDE_EVTLOG_FUNC_ENTRY, dp->state,
 			dp->debug->psm_enabled);
 
+	/* skip if a disconnect is already in progress */
+	if (dp_display_state_is(DP_STATE_ABORTED)) {
+		DP_DEBUG("disconnect already in progress\n");
+		SDE_EVT32_EXTERNAL(SDE_EVTLOG_FUNC_CASE1, dp->state);
+		return 0;
+	}
+
 	if (dp->debug->psm_enabled && dp_display_state_is(DP_STATE_READY))
 		dp->link->psm_config(dp->link, &dp->panel->link_info, true);