linux-arm-msm.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Kuogee Hsieh <khsieh@codeaurora.org>
To: robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org
Cc: Kuogee Hsieh <khsieh@codeaurora.org>,
	abhinavk@codeaurora.org, aravindh@codeaurora.org,
	airlied@linux.ie, daniel@ffwll.ch, linux-arm-msm@vger.kernel.org,
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v4 1/4] drm/msm/dp: check sink_count before update is_connected status
Date: Wed, 21 Apr 2021 16:37:35 -0700	[thread overview]
Message-ID: <1619048258-8717-2-git-send-email-khsieh@codeaurora.org> (raw)
In-Reply-To: <1619048258-8717-1-git-send-email-khsieh@codeaurora.org>

Link status is different from display connected status in the case
of something like an Apple dongle where the type-c plug can be
connected, and therefore the link is connected, but no sink is
connected until an HDMI cable is plugged into the dongle.
The sink_count of DPCD of dongle will increase to 1 once an HDMI
cable is plugged into the dongle so that display connected status
will become true. This checking also apply at pm_resume.

Changes in v4:
-- none

Fixes: 94e58e2d06e3 ("drm/msm/dp: reset dp controller only at boot up and pm_resume")
Reported-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Tested-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 5a39da6..0ba71c7 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -586,10 +586,8 @@ static int dp_connect_pending_timeout(struct dp_display_private *dp, u32 data)
 	mutex_lock(&dp->event_mutex);
 
 	state = dp->hpd_state;
-	if (state == ST_CONNECT_PENDING) {
-		dp_display_enable(dp, 0);
+	if (state == ST_CONNECT_PENDING)
 		dp->hpd_state = ST_CONNECTED;
-	}
 
 	mutex_unlock(&dp->event_mutex);
 
@@ -669,10 +667,8 @@ static int dp_disconnect_pending_timeout(struct dp_display_private *dp, u32 data
 	mutex_lock(&dp->event_mutex);
 
 	state =  dp->hpd_state;
-	if (state == ST_DISCONNECT_PENDING) {
-		dp_display_disable(dp, 0);
+	if (state == ST_DISCONNECT_PENDING)
 		dp->hpd_state = ST_DISCONNECTED;
-	}
 
 	mutex_unlock(&dp->event_mutex);
 
@@ -1272,7 +1268,12 @@ static int dp_pm_resume(struct device *dev)
 
 	status = dp_catalog_link_is_connected(dp->catalog);
 
-	if (status)
+	/*
+	 * can not declared display is connected unless
+	 * HDMI cable is plugged in and sink_count of
+	 * dongle become 1
+	 */
+	if (status && dp->link->sink_count)
 		dp->dp_display.is_connected = true;
 	else
 		dp->dp_display.is_connected = false;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  reply	other threads:[~2021-04-21 23:38 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 23:37 [PATCH v4 0/4] " Kuogee Hsieh
2021-04-21 23:37 ` Kuogee Hsieh [this message]
2021-05-04  4:30   ` [PATCH v4 1/4] drm/msm/dp: " Stephen Boyd
2021-04-21 23:37 ` [PATCH v4 2/4] drm/msm/dp: initialize audio_comp when audio starts Kuogee Hsieh
2021-05-04  4:32   ` Stephen Boyd
2021-04-21 23:37 ` [PATCH v4 3/4] drm/msm/dp: check main link status before start aux read Kuogee Hsieh
2021-05-04  4:42   ` Stephen Boyd
2021-04-21 23:37 ` [PATCH v4 4/4] drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read failed Kuogee Hsieh
2021-05-04  4:35   ` Stephen Boyd
2021-11-25  7:32     ` Dmitry Baryshkov
2021-12-01 20:48       ` khsieh
2021-05-07  0:23 ` [PATCH v4 0/4] check sink_count before update is_connected status Rob Clark

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1619048258-8717-2-git-send-email-khsieh@codeaurora.org \
    --to=khsieh@codeaurora.org \
    --cc=abhinavk@codeaurora.org \
    --cc=airlied@linux.ie \
    --cc=aravindh@codeaurora.org \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=freedreno@lists.freedesktop.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=robdclark@gmail.com \
    --cc=sean@poorly.run \
    --cc=swboyd@chromium.org \
    --subject='Re: [PATCH v4 1/4] drm/msm/dp: check sink_count before update is_connected status' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).