[PATCH v2] drm/msm/dp: update is_connected status base on sink count at dp_pm_resume()

[Kuogee Hsieh]

Currently at dp_pm_resume() is_connected state is decided base on hpd connection
status only. This will put is_connected in wrongly "true" state at the scenario
that dongle attached to DUT but without hmdi cable connecting to it. Fix this
problem by adding read sink count from dongle and decided is_connected state base
on both sink count and hpd connection status.

Changes in v2:
-- remove dp_get_sink_count() cand call drm_dp_read_sink_count()

Fixes: d9aa6571b28ba ("drm/msm/dp: check sink_count before update is_connected status")
Signed-off-by: Kuogee Hsieh <khsieh at codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 8b69114..6dcb78e 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1403,6 +1403,7 @@ static int dp_pm_resume(struct device *dev)
 	struct msm_dp *dp_display = platform_get_drvdata(pdev);
 	struct dp_display_private *dp;
 	u32 status;
+	int sink_count = 0;
 
 	dp = container_of(dp_display, struct dp_display_private, dp_display);
 xlog(__func__, 1,0,0, dp->core_initialized, dp_display->power_on);
@@ -1417,15 +1418,26 @@ xlog(__func__, 1,0,0, dp->core_initialized, dp_display->power_on);
 
 	dp_catalog_ctrl_hpd_config(dp->catalog);
 
-	status = dp_catalog_link_is_connected(dp->catalog);
+	/*
+	 * set sink to normal operation mode -- D0
+	 * before dpcd read
+	 */
+	dp_link_psm_config(dp->link, &dp->panel->link_info, false);
+
+	/* if sink conencted, do dpcd read sink count */
+	if ((status = dp_catalog_link_is_connected(dp->catalog))) {
+		sink_count = drm_dp_read_sink_count(dp->aux);
+		if (sink_count < 0)
+			sink_count = 0;
+	}
 
+	dp->link->sink_count = sink_count;
 	/*
 	 * can not declared display is connected unless
 	 * HDMI cable is plugged in and sink_count of
 	 * dongle become 1
 	 */
-xlog(__func__, 0x12,0,0, 0, dp->link->sink_count);
-	if (status && dp->link->sink_count)
+	if (dp->link->sink_count)
 		dp->dp_display.is_connected = true;
 	else
 		dp->dp_display.is_connected = false;
-- 
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