From 9463b64d1a34fc4d18f9de63f07b2400c86f8da8 Mon Sep 17 00:00:00 2001
From: Kuogee Hsieh <khsieh@codeaurora.org>
Date: Wed, 29 Sep 2021 09:17:04 -0700
Subject: [PATCH] drm/msm/dp: only signal audio when disconnected detected at dp_pm_resume
Git-commit: 9463b64d1a34fc4d18f9de63f07b2400c86f8da8
Patch-mainline: v5.15-rc6
References: git-fixes

Currently there is audio not working problem after system resume from suspend
if hdmi monitor stay plugged in at DUT. However this problem does not happen
at normal operation but at a particular test case. The root cause is DP driver
signal audio with connected state at resume which trigger audio trying to setup
audio data path through DP main link but failed due to display port is not setup
and enabled by upper layer framework yet. This patch only have DP driver signal
audio only when DP is in disconnected state so that audio option shows correct
state after system resume. DP driver will not signal audio with connected state
until display enabled executed by upper layer framework where display port is
setup completed and main link is running.

Changes in V2:
-- add details commit text

Fixes: afc9b8b6bab8 ("drm/msm/dp: signal audio plugged change at dp_pm_resume")
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1632932224-25102-1-git-send-email-khsieh@codeaurora.org
Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/msm/dp/dp_display.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1313,14 +1313,14 @@ static int dp_pm_resume(struct device *d
 	 * can not declared display is connected unless
 	 * HDMI cable is plugged in and sink_count of
 	 * dongle become 1
+	 * also only signal audio when disconnected
 	 */
-	if (dp->link->sink_count)
+	if (dp->link->sink_count) {
 		dp->dp_display.is_connected = true;
-	else
+	} else {
 		dp->dp_display.is_connected = false;
-
-	dp_display_handle_plugged_change(g_dp_display,
-				dp->dp_display.is_connected);
+		dp_display_handle_plugged_change(g_dp_display, false);
+	}
 
 
 	mutex_unlock(&dp->event_mutex);