drm/udl: Fixed problem with UDL adpater reconnection

Fixed problem with DisplayLink and DisplayLink certified adapers in drm/udl
driver when adapter doesn't want to work if it was initialized with
disconnected DVI cable by enabling drm connectot polling and updating
current connector's state.

Signed-off-by: Robert Tarasov <tutankhamen@chromium.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013001350.172155-1-tutankhamen@chromium.org

diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
index 9f9a497..b4d1464 100644 (file)
--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -14,6 +14,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_crtc_helper.h>
+#include "udl_connector.h"
 #include "udl_drv.h"
 
 /* dummy connector to just get EDID,
@@ -56,28 +57,15 @@ error:
 
 static int udl_get_modes(struct drm_connector *connector)
 {
-       struct udl_device *udl = connector->dev->dev_private;
-       struct edid *edid;
-       int ret;
-
-       edid = (struct edid *)udl_get_edid(udl);
-       if (!edid) {
-               drm_mode_connector_update_edid_property(connector, NULL);
-               return 0;
-       }
-
-       /*
-        * We only read the main block, but if the monitor reports extension
-        * blocks then the drm edid code expects them to be present, so patch
-        * the extension count to 0.
-        */
-       edid->checksum += edid->extensions;
-       edid->extensions = 0;
-
-       drm_mode_connector_update_edid_property(connector, edid);
-       ret = drm_add_edid_modes(connector, edid);
-       kfree(edid);
-       return ret;
+       struct udl_drm_connector *udl_connector =
+                                       container_of(connector,
+                                       struct udl_drm_connector,
+                                       connector);
+
+       drm_mode_connector_update_edid_property(connector, udl_connector->edid);
+       if (udl_connector->edid)
+               return drm_add_edid_modes(connector, udl_connector->edid);
+       return 0;
 }
 
 static int udl_mode_valid(struct drm_connector *connector,
@@ -96,8 +84,33 @@ static int udl_mode_valid(struct drm_connector *connector,
 static enum drm_connector_status
 udl_detect(struct drm_connector *connector, bool force)
 {
-       if (drm_dev_is_unplugged(connector->dev))
+       struct edid *edid;
+       struct udl_device *udl = connector->dev->dev_private;
+       struct udl_drm_connector *udl_connector =
+                                       container_of(connector,
+                                       struct udl_drm_connector,
+                                       connector);
+
+       if (udl_connector->edid != NULL) {
+               kfree(udl_connector->edid);
+               udl_connector->edid = NULL;
+       }
+
+       edid = (struct edid *)udl_get_edid(udl);
+       if (!edid || !memchr_inv(edid, 0, EDID_LENGTH))
                return connector_status_disconnected;
+
+       udl_connector->edid = edid;
+
+       /*
+        * We only read the main block, but if the monitor reports extension
+        * blocks then the drm edid code expects them to be present, so patch
+        * the extension count to 0.
+        */
+       udl_connector->edid->checksum +=
+                       udl_connector->edid->extensions;
+       udl_connector->edid->extensions = 0;
+
        return connector_status_connected;
 }
 
@@ -117,8 +130,14 @@ static int udl_connector_set_property(struct drm_connector *connector,
 
 static void udl_connector_destroy(struct drm_connector *connector)
 {
+       struct udl_drm_connector *udl_connector =
+                                       container_of(connector,
+                                       struct udl_drm_connector,
+                                       connector);
+
        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
+       kfree(udl_connector->edid);
        kfree(connector);
 }
 
@@ -138,17 +157,22 @@ static const struct drm_connector_funcs udl_connector_funcs = {
 
 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 {
+       struct udl_drm_connector *udl_connector;
        struct drm_connector *connector;
 
-       connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
-       if (!connector)
+       udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
+       if (!udl_connector)
                return -ENOMEM;
 
-       drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
+       connector = &udl_connector->connector;
+       drm_connector_init(dev, connector, &udl_connector_funcs,
+                          DRM_MODE_CONNECTOR_DVII);
        drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 
        drm_connector_register(connector);
        drm_mode_connector_attach_encoder(connector, encoder);
+       connector->polled = DRM_CONNECTOR_POLL_HPD |
+               DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 
        return 0;
 }

diff --git a/drivers/gpu/drm/udl/udl_connector.h b/drivers/gpu/drm/udl/udl_connector.h
new file mode 100644 (file)
index 0000000..0fb0db5
--- /dev/null
+++ b/drivers/gpu/drm/udl/udl_connector.h
@@ -0,0 +1,13 @@
+#ifndef __UDL_CONNECTOR_H__
+#define __UDL_CONNECTOR_H__
+
+#include <drm/drm_crtc.h>
+
+struct udl_drm_connector {
+       struct drm_connector connector;
+       /* last udl_detect edid */
+       struct edid *edid;
+};
+
+
+#endif //__UDL_CONNECTOR_H__

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index 31421b6..3c45a30 100644 (file)
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -14,6 +14,9 @@
 static int udl_usb_suspend(struct usb_interface *interface,
                           pm_message_t message)
 {
+       struct drm_device *dev = usb_get_intfdata(interface);
+
+       drm_kms_helper_poll_disable(dev);
        return 0;
 }
 
@@ -21,6 +24,7 @@ static int udl_usb_resume(struct usb_interface *interface)
 {
        struct drm_device *dev = usb_get_intfdata(interface);
 
+       drm_kms_helper_poll_enable(dev);
        udl_modeset_restore(dev);
        return 0;
 }

diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 0328b2c..f1ec452 100644 (file)
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -11,6 +11,7 @@
  * more details.
  */
 #include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
 #include "udl_drv.h"
 
 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
@@ -350,6 +351,8 @@ int udl_driver_load(struct drm_device *dev, unsigned long flags)
        if (ret)
                goto err_fb;
 
+       drm_kms_helper_poll_init(dev);
+
        return 0;
 err_fb:
        udl_fbdev_cleanup(dev);
@@ -371,6 +374,8 @@ void udl_driver_unload(struct drm_device *dev)
 {
        struct udl_device *udl = dev->dev_private;
 
+       drm_kms_helper_poll_fini(dev);
+
        if (udl->urbs.count)
                udl_free_urb_list(dev);