drm/radeon/kms: handle !force case in connector detect more gracefully

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@amd.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index fbcf21d..9b5b3e4 100644 (file)
--- 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 (file)
--- 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;