From: Robert Tarasov Date: Thu, 12 Oct 2017 17:13:49 -0700 Subject: drm/udl: Fixed problem with UDL adpater reconnection Git-commit: afdfc4c6f55f953e073f0eef9e2afa3c8cf78d7c Patch-mainline: v4.15-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 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 Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20171013001350.172155-1-tutankhamen@chromium.org Acked-by: Petr Tesarik --- drivers/gpu/drm/udl/udl_connector.c | 76 +++++++++++++++++++++++------------- drivers/gpu/drm/udl/udl_connector.h | 13 ++++++ drivers/gpu/drm/udl/udl_drv.c | 4 + drivers/gpu/drm/udl/udl_main.c | 5 ++ 4 files changed, 72 insertions(+), 26 deletions(-) --- a/drivers/gpu/drm/udl/udl_connector.c +++ b/drivers/gpu/drm/udl/udl_connector.c @@ -14,6 +14,7 @@ #include #include #include +#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_con 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(st 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 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; } --- /dev/null +++ b/drivers/gpu/drm/udl/udl_connector.h @@ -0,0 +1,13 @@ +#ifndef __UDL_CONNECTOR_H__ +#define __UDL_CONNECTOR_H__ + +#include + +struct udl_drm_connector { + struct drm_connector connector; + /* last udl_detect edid */ + struct edid *edid; +}; + + +#endif //__UDL_CONNECTOR_H__ --- 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_int { struct drm_device *dev = usb_get_intfdata(interface); + drm_kms_helper_poll_enable(dev); udl_modeset_restore(dev); return 0; } --- a/drivers/gpu/drm/udl/udl_main.c +++ b/drivers/gpu/drm/udl/udl_main.c @@ -11,6 +11,7 @@ * more details. */ #include +#include #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 *d 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 { struct udl_device *udl = dev->dev_private; + drm_kms_helper_poll_fini(dev); + if (udl->urbs.count) udl_free_urb_list(dev);