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* [PATCH v2 3/3] drm/msm/dp: check main link status before start aux read
@ 2021-04-13 23:11 Kuogee Hsieh
  2021-04-14 21:09 ` Stephen Boyd
  0 siblings, 1 reply; 7+ messages in thread
From: Kuogee Hsieh @ 2021-04-13 23:11 UTC (permalink / raw)
  To: robdclark, sean, swboyd
  Cc: tanmay, abhinavk, aravindh, khsieh, airlied, daniel,
	linux-arm-msm, dri-devel, freedreno, linux-kernel

Make sure main link is in connection state before start aux
read/write operation to avoid unnecessary long delay due to
main link had been unplugged.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_aux.c  |  5 +++++
 drivers/gpu/drm/msm/dp/dp_link.c | 20 +++++++++++++++-----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
index 7c22bfe..fae3806 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -343,6 +343,11 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
 
 	mutex_lock(&aux->mutex);
 
+	if (!dp_catalog_link_is_connected(aux->catalog)) {
+		ret = -ETIMEDOUT;
+		goto unlock_exit;
+	}
+
 	aux->native = msg->request & (DP_AUX_NATIVE_WRITE & DP_AUX_NATIVE_READ);
 
 	/* Ignore address only message */
diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
index be986da..d35b18e 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.c
+++ b/drivers/gpu/drm/msm/dp/dp_link.c
@@ -737,18 +737,25 @@ static int dp_link_parse_sink_count(struct dp_link *dp_link)
 	return 0;
 }
 
-static void dp_link_parse_sink_status_field(struct dp_link_private *link)
+static int dp_link_parse_sink_status_field(struct dp_link_private *link)
 {
 	int len = 0;
 
 	link->prev_sink_count = link->dp_link.sink_count;
-	dp_link_parse_sink_count(&link->dp_link);
+	len = dp_link_parse_sink_count(&link->dp_link);
+	if (len < 0) {
+		DRM_ERROR("DP lparse sink count failed\n");
+		return len;
+	}
 
 	len = drm_dp_dpcd_read_link_status(link->aux,
 		link->link_status);
-	if (len < DP_LINK_STATUS_SIZE)
+	if (len < DP_LINK_STATUS_SIZE) {
 		DRM_ERROR("DP link status read failed\n");
-	dp_link_parse_request(link);
+		return len;
+	}
+
+	return dp_link_parse_request(link);
 }
 
 /**
@@ -1032,7 +1039,10 @@ int dp_link_process_request(struct dp_link *dp_link)
 
 	dp_link_reset_data(link);
 
-	dp_link_parse_sink_status_field(link);
+	ret = dp_link_parse_sink_status_field(link);
+	if (ret) {
+		return ret;
+	}
 
 	if (link->request.test_requested == DP_TEST_LINK_EDID_READ) {
 		dp_link->sink_request |= DP_TEST_LINK_EDID_READ;
-- 
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a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2021-04-15 23:28 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-13 23:11 [PATCH v2 3/3] drm/msm/dp: check main link status before start aux read Kuogee Hsieh
2021-04-14 21:09 ` Stephen Boyd
2021-04-15 17:37   ` khsieh
2021-04-15 20:06     ` Stephen Boyd
2021-04-15 22:02       ` khsieh
2021-04-15 22:46         ` Stephen Boyd
2021-04-15 23:28           ` [PATCH v3 " Kuogee Hsieh

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