drm: remove the EDID blob stored in the EDID property when it is disconnected

commit 725398322d05486109375fbb85c3404108881e17 upstream.

Now the EDID property will be updated when the corresponding EDID can be
obtained from the external display device. But after the external device
is plugged-out, the EDID property is not updated. In such case we still
get the corresponding EDID property although it is already detected as
disconnected.

https://bugs.freedesktop.org/show_bug.cgi?id=26743

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 7d0f00a935faa46c2bc60d15027d2edf1ba29397..99907c32ea2928326e3037e1de1d8f1814ce5fea 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -104,6 +104,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
        if (connector->status == connector_status_disconnected) {
                DRM_DEBUG_KMS("%s is disconnected\n",
                          drm_get_connector_name(connector));
+               drm_mode_connector_update_edid_property(connector, NULL);
                goto prune;
        }