[PATCH v4 6/8] drm/msm: dp: handle the IRQ_HPD events reported by USB-C

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side, for example DP MST events.

Let the MSM DisplayPort driver properly track and handle IRQ_HPD
delivered over the OOB events (e.g. from the USB-C AltMode handler).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index c0f6a8ff9b99..743d8fa40dc6 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1533,11 +1533,12 @@ void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
 		   msm_dp_display->connector_type, hpd_link_status, status);
 
 	if (status == connector_status_connected) {
-		if (hpd_link_status == ISR_HPD_REPLUG_COUNT) {
+		if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT ||
+		    extra_status == DRM_CONNECTOR_DP_IRQ_HPD) {
+			msm_dp_irq_hpd_handle(dp);
+		} else if (hpd_link_status == ISR_HPD_REPLUG_COUNT) {
 			msm_dp_hpd_unplug_handle(dp);
 			msm_dp_hpd_plug_handle(dp);
-		} else if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT) {
-			msm_dp_irq_hpd_handle(dp);
 		} else {
 			msm_dp_hpd_plug_handle(dp);
 		}

-- 
2.47.3