[PATCH] drm/msm/dp: promote irq_hpd handle to handle link trainign correctly

[Kuogee Hsieh]

Some dongles, such as Apple, required link training done at irq_hpd
request instead of plugin request. This patch promote irq_hpd hanlder
to handle link training and setup hpd_state correctly.

Signed-off-by: Kuogee Hsieh <khsieh at codeaurora.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 13b66266cd69..55627530957c 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -469,7 +469,9 @@ static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
 static int dp_display_usbpd_attention_cb(struct device *dev)
 {
 	int rc = 0;
+	u32 sink_request;
 	struct dp_display_private *dp;
+	struct dp_usbpd *hpd;
 
 	if (!dev) {
 		DRM_ERROR("invalid dev\n");
@@ -483,10 +485,24 @@ static int dp_display_usbpd_attention_cb(struct device *dev)
 		return -ENODEV;
 	}
 
+	hpd = dp->usbpd;
+
 	/* check for any test request issued by sink */
 	rc = dp_link_process_request(dp->link);
-	if (!rc)
-		dp_display_handle_irq_hpd(dp);
+	if (!rc) {
+		sink_request = dp->link->sink_request;
+		if (sink_request & DS_PORT_STATUS_CHANGED) {
+			dp->hpd_state = ST_CONNECT_PENDING;
+			hpd->hpd_high = 1;
+		}
+
+		rc = dp_display_handle_irq_hpd(dp);
+
+		if (rc && sink_request & DS_PORT_STATUS_CHANGED) {
+			hpd->hpd_high = 0;
+			dp->hpd_state = ST_DISCONNECTED;
+		}
+	}
 
 	return rc;
 }

base-commit: 0e162b10644605428cd2596c12f8ed410cf9d2d9
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project