[PATCH 2/2] drm/radeon/kms: handle !force case in connector detect more gracefully

[alexdeucher at gmail.com]

From: Alex Deucher <alexander.deucher at amd.com>

When force == false, we don't do load detection in the connector
detect functions.  Unforunately, we also return the previous
connector state so we never get disconnect events for DVI-I, DVI-A,
or VGA.  Save whether we detected the monitor via load detection
previously and use that to determine whether we return the previous
state or not.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=41561

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at kernel.org
---
 drivers/gpu/drm/radeon/radeon_connectors.c |   23 ++++++++++++++++++++---
 drivers/gpu/drm/radeon/radeon_mode.h       |    1 +
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 103eb1b..dec6cbe 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -724,6 +724,7 @@ radeon_vga_detect(struct drm_connector *connector, bool force)
 		dret = radeon_ddc_probe(radeon_connector,
 					radeon_connector->requires_extended_probe);
 	if (dret) {
+		radeon_connector->detected_by_load = false;
 		if (radeon_connector->edid) {
 			kfree(radeon_connector->edid);
 			radeon_connector->edid = NULL;
@@ -750,12 +751,21 @@ radeon_vga_detect(struct drm_connector *connector, bool force)
 	} else {
 
 		/* if we aren't forcing don't do destructive polling */
-		if (!force)
-			return connector->status;
+		if (!force) {
+			/* only return the previous status if we last
+			 * detected a monitor via load.
+			 */
+			if (radeon_connector->detected_by_load)
+				return connector->status;
+			else
+				return ret;
+		}
 
 		if (radeon_connector->dac_load_detect && encoder) {
 			encoder_funcs = encoder->helper_private;
 			ret = encoder_funcs->detect(encoder, connector);
+			if (ret == connector_status_connected)
+				radeon_connector->detected_by_load = true;
 		}
 	}
 
@@ -897,6 +907,7 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
 		dret = radeon_ddc_probe(radeon_connector,
 					radeon_connector->requires_extended_probe);
 	if (dret) {
+		radeon_connector->detected_by_load = false;
 		if (radeon_connector->edid) {
 			kfree(radeon_connector->edid);
 			radeon_connector->edid = NULL;
@@ -964,8 +975,13 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
 	    (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA))
 		goto out;
 
+	/* if we aren't forcing don't do destructive polling */
 	if (!force) {
-		ret = connector->status;
+		/* only return the previous status if we last
+		 * detected a monitor via load.
+		 */
+		if (radeon_connector->detected_by_load)
+			ret = connector->status;
 		goto out;
 	}
 
@@ -989,6 +1005,7 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
 					ret = encoder_funcs->detect(encoder, connector);
 					if (ret == connector_status_connected) {
 						radeon_connector->use_digital = false;
+						radeon_connector->detected_by_load = true;
 					}
 				}
 				break;
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 68820f5..ed0178f 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -447,6 +447,7 @@ struct radeon_connector {
 	struct edid *edid;
 	void *con_priv;
 	bool dac_load_detect;
+	bool detected_by_load; /* if the connection status was determined by load */
 	uint16_t connector_object_id;
 	struct radeon_hpd hpd;
 	struct radeon_router router;
-- 
1.7.1.1