staging/vboxvideo: Drop initial_mode_queried workaround

Drop the initial_mode_queried workaround for kms clients which do not
support hotplug, all kms clients should be able to deal with hotplug.
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190304164724.10210-2-hdegoede@redhat.com

drivers/staging/vboxvideo/TODO

 TODO:
 -Get a full review from the drm-maintainers on dri-devel done on this driver
--Drop all the logic around initial_mode_queried, the master_set and
- master_drop callbacks and everything related to this. kms clients can handle
- hotplugs.
 -Extend this TODO with the results of that review
 
 Please send any patches to Greg Kroah-Hartman <gregkh@linuxfoundation.org>,

drivers/staging/vboxvideo/vbox_drv.c

@@ -200,36 +200,11 @@ static const struct file_operations vbox_fops = {
 	.read = drm_read,
 };
 
-static int vbox_master_set(struct drm_device *dev,
-			   struct drm_file *file_priv, bool from_open)
-{
-	struct vbox_private *vbox = dev->dev_private;
-
-	/*
-	 * We do not yet know whether the new owner can handle hotplug, so we
-	 * do not advertise dynamic modes on the first query and send a
-	 * tentative hotplug notification after that to see if they query again.
-	 */
-	vbox->initial_mode_queried = false;
-
-	return 0;
-}
-
-static void vbox_master_drop(struct drm_device *dev, struct drm_file *file_priv)
-{
-	struct vbox_private *vbox = dev->dev_private;
-
-	/* See vbox_master_set() */
-	vbox->initial_mode_queried = false;
-}
-
 static struct drm_driver driver = {
 	.driver_features =
 	    DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 
 	.lastclose = drm_fb_helper_lastclose,
-	.master_set = vbox_master_set,
-	.master_drop = vbox_master_drop,
 
 	.fops = &vbox_fops,
 	.irq_handler = vbox_irq_handler,

drivers/staging/vboxvideo/vbox_drv.h

@@ -83,12 +83,6 @@ struct vbox_private {
 	} ttm;
 
 	struct mutex hw_mutex; /* protects modeset and accel/vbva accesses */
-	/*
-	 * We decide whether or not user-space supports display hot-plug
-	 * depending on whether they react to a hot-plug event after the initial
-	 * mode query.
-	 */
-	bool initial_mode_queried;
 	struct work_struct hotplug_work;
 	u32 input_mapping_width;
 	u32 input_mapping_height;

drivers/staging/vboxvideo/vbox_main.c

@@ -32,9 +32,9 @@ void vbox_report_caps(struct vbox_private *vbox)
 	u32 caps = VBVACAPS_DISABLE_CURSOR_INTEGRATION |
 		   VBVACAPS_IRQ | VBVACAPS_USE_VBVA_ONLY;
 
-	if (vbox->initial_mode_queried)
-		caps |= VBVACAPS_VIDEO_MODE_HINTS;
-
+	/* The host only accepts VIDEO_MODE_HINTS if it is send separately. */
+	hgsmi_send_caps_info(vbox->guest_pool, caps);
+	caps |= VBVACAPS_VIDEO_MODE_HINTS;
 	hgsmi_send_caps_info(vbox->guest_pool, caps);
 }
 

drivers/staging/vboxvideo/vbox_mode.c

@@ -736,29 +736,12 @@ static int vbox_get_modes(struct drm_connector *connector)
 
 	vbox_connector = to_vbox_connector(connector);
 	vbox = connector->dev->dev_private;
-	/*
-	 * Heuristic: we do not want to tell the host that we support dynamic
-	 * resizing unless we feel confident that the user space client using
-	 * the video driver can handle hot-plug events.  So the first time modes
-	 * are queried after a "master" switch we tell the host that we do not,
-	 * and immediately after we send the client a hot-plug notification as
-	 * a test to see if they will respond and query again.
-	 * That is also the reason why capabilities are reported to the host at
-	 * this place in the code rather than elsewhere.
-	 * We need to report the flags location before reporting the IRQ
-	 * capability.
-	 */
+
 	hgsmi_report_flags_location(vbox->guest_pool, GUEST_HEAP_OFFSET(vbox) +
 				    HOST_FLAGS_OFFSET);
 	if (vbox_connector->vbox_crtc->crtc_id == 0)
 		vbox_report_caps(vbox);
-	if (!vbox->initial_mode_queried) {
-		if (vbox_connector->vbox_crtc->crtc_id == 0) {
-			vbox->initial_mode_queried = true;
-			vbox_report_hotplug(vbox);
-		}
-		return drm_add_modes_noedid(connector, 800, 600);
-	}
+
 	num_modes = drm_add_modes_noedid(connector, 2560, 1600);
 	preferred_width = vbox_connector->mode_hint.width ?
 			  vbox_connector->mode_hint.width : 1024;