drm/msm/dp: replug event is converted into an unplug followed by an plug events

Remove special handling of replug interrupt and instead treat replug event
as a sequential unplug followed by a plugin event. This is needed to meet
the requirements of DP Link Layer CTS test case 4.2.1.3.

Changes in V2:
-- add fixes statement

Changes in V3:
-- delete EV_HPD_REPLUG_INT

Fixes: f21c8a27 ("drm/msm/dp: handle irq_hpd with sink_count = 0 correctly")
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1628196295-7382-5-git-send-email-khsieh@codeaurora.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dp/dp_display.c

@@ -55,7 +55,6 @@ enum {
 	EV_HPD_INIT_SETUP,
 	EV_HPD_PLUG_INT,
 	EV_IRQ_HPD_INT,
-	EV_HPD_REPLUG_INT,
 	EV_HPD_UNPLUG_INT,
 	EV_USER_NOTIFICATION,
 	EV_CONNECT_PENDING_TIMEOUT,
@@ -1110,9 +1109,6 @@ static int hpd_event_thread(void *data)
 		case EV_IRQ_HPD_INT:
 			dp_irq_hpd_handle(dp_priv, todo->data);
 			break;
-		case EV_HPD_REPLUG_INT:
-			/* do nothing */
-			break;
 		case EV_USER_NOTIFICATION:
 			dp_display_send_hpd_notification(dp_priv,
 						todo->data);
@@ -1157,10 +1153,8 @@ static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
 	DRM_DEBUG_DP("hpd isr status=%#x\n", hpd_isr_status);
 	if (hpd_isr_status & 0x0F) {
 		/* hpd related interrupts */
-		if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK ||
-			hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
+		if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
 			dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
-		}
 
 		if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
 			/* stop sentinel connect pending checking */
@@ -1168,8 +1162,10 @@ static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
 			dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
 		}
 
-		if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK)
-			dp_add_event(dp, EV_HPD_REPLUG_INT, 0, 0);
+		if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
+			dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
+			dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
+		}
 
 		if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
 			dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);