drm/fbdev: rework output polling to be back in the core. (v4)

After thinking it over a lot it made more sense for the core to deal with
the output polling especially so it can notify X.

v2: drop plans for fake connector - per Michel's comments - fix X patch sent to xorg-devel, add intel polled/hpd setting, add initial nouveau polled/hpd settings.

v3: add config lock take inside polling, add intel/nouveau poll init/fini calls

v4: config lock was a bit agressive, only needed around connector list reading.
otherwise it could re-enter.

glisse: discard drm_helper_hpd_irq_event

v3: Reviewed-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/Kconfig

@@ -9,6 +9,7 @@ menuconfig DRM
 	depends on (AGP || AGP=n) && PCI && !EMULATED_CMPXCHG && MMU
 	select I2C
 	select I2C_ALGOBIT
+	select SLOW_WORK
 	help
 	  Kernel-level support for the Direct Rendering Infrastructure (DRI)
 	  introduced in XFree86 4.0. If you say Y here, you need to select
@@ -23,7 +24,6 @@ config DRM_KMS_HELPER
 	depends on DRM
 	select FB
 	select FRAMEBUFFER_CONSOLE if !EMBEDDED
-	select SLOW_WORK
 	help
 	  FB and CRTC helpers for KMS drivers.
 

drivers/gpu/drm/drm_crtc_helper.c

@@ -807,3 +807,98 @@ int drm_helper_resume_force_mode(struct drm_device *dev)
 	return 0;
 }
 EXPORT_SYMBOL(drm_helper_resume_force_mode);
+
+static struct slow_work_ops output_poll_ops;
+
+#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
+static void output_poll_execute(struct slow_work *work)
+{
+	struct delayed_slow_work *delayed_work = container_of(work, struct delayed_slow_work, work);
+	struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_slow_work);
+	struct drm_connector *connector;
+	enum drm_connector_status old_status, status;
+	bool repoll = false, changed = false;
+	int ret;
+
+	mutex_lock(&dev->mode_config.mutex);
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+
+		/* if this is HPD or polled don't check it -
+		   TV out for instance */
+		if (!connector->polled)
+			continue;
+
+		else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
+			repoll = true;
+
+		old_status = connector->status;
+		/* if we are connected and don't want to poll for disconnect
+		   skip it */
+		if (old_status == connector_status_connected &&
+		    !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
+		    !(connector->polled & DRM_CONNECTOR_POLL_HPD))
+			continue;
+
+		status = connector->funcs->detect(connector);
+		if (old_status != status)
+			changed = true;
+	}
+
+	mutex_unlock(&dev->mode_config.mutex);
+
+	if (changed) {
+		/* send a uevent + call fbdev */
+		drm_sysfs_hotplug_event(dev);
+		if (dev->mode_config.funcs->output_poll_changed)
+			dev->mode_config.funcs->output_poll_changed(dev);
+	}
+
+	if (repoll) {
+		ret = delayed_slow_work_enqueue(delayed_work, DRM_OUTPUT_POLL_PERIOD);
+		if (ret)
+			DRM_ERROR("delayed enqueue failed %d\n", ret);
+	}
+}
+
+void drm_kms_helper_poll_init(struct drm_device *dev)
+{
+	struct drm_connector *connector;
+	bool poll = false;
+	int ret;
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		if (connector->polled)
+			poll = true;
+	}
+	slow_work_register_user(THIS_MODULE);
+	delayed_slow_work_init(&dev->mode_config.output_poll_slow_work,
+			       &output_poll_ops);
+
+	if (poll) {
+		ret = delayed_slow_work_enqueue(&dev->mode_config.output_poll_slow_work, DRM_OUTPUT_POLL_PERIOD);
+		if (ret)
+			DRM_ERROR("delayed enqueue failed %d\n", ret);
+	}
+}
+EXPORT_SYMBOL(drm_kms_helper_poll_init);
+
+void drm_kms_helper_poll_fini(struct drm_device *dev)
+{
+	delayed_slow_work_cancel(&dev->mode_config.output_poll_slow_work);
+	slow_work_unregister_user(THIS_MODULE);
+}
+EXPORT_SYMBOL(drm_kms_helper_poll_fini);
+
+void drm_helper_hpd_irq_event(struct drm_device *dev)
+{
+	if (!dev->mode_config.poll_enabled)
+		return;
+	delayed_slow_work_cancel(&dev->mode_config.output_poll_slow_work);
+	/* schedule a slow work asap */
+	delayed_slow_work_enqueue(&dev->mode_config.output_poll_slow_work, 0);
+}
+EXPORT_SYMBOL(drm_helper_hpd_irq_event);
+
+static struct slow_work_ops output_poll_ops = {
+	.execute = output_poll_execute,
+};

drivers/gpu/drm/drm_fb_helper.c

@@ -42,8 +42,6 @@ MODULE_LICENSE("GPL and additional rights");
 
 static LIST_HEAD(kernel_fb_helper_list);
 
-static struct slow_work_ops output_status_change_ops;
-
 /* simple single crtc case helper function */
 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 {
@@ -425,19 +423,13 @@ static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 
 int drm_fb_helper_init(struct drm_device *dev,
 		       struct drm_fb_helper *fb_helper,
-		       int crtc_count, int max_conn_count,
-		       bool polled)
+		       int crtc_count, int max_conn_count)
 {
 	struct drm_crtc *crtc;
 	int ret = 0;
 	int i;
 
 	fb_helper->dev = dev;
-	fb_helper->poll_enabled = polled;
-
-	slow_work_register_user(THIS_MODULE);
-	delayed_slow_work_init(&fb_helper->output_status_change_slow_work,
-			       &output_status_change_ops);
 
 	INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 
@@ -494,8 +486,6 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 
 	drm_fb_helper_crtc_free(fb_helper);
 
-	delayed_slow_work_cancel(&fb_helper->output_status_change_slow_work);
-	slow_work_unregister_user(THIS_MODULE);
 }
 EXPORT_SYMBOL(drm_fb_helper_fini);
 
@@ -713,7 +703,7 @@ int drm_fb_helper_set_par(struct fb_info *info)
 
 	if (fb_helper->delayed_hotplug) {
 		fb_helper->delayed_hotplug = false;
-		delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 0);
+		drm_fb_helper_hotplug_event(fb_helper);
 	}
 	return 0;
 }
@@ -826,7 +816,7 @@ int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 	if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 		/* hmm everyone went away - assume VGA cable just fell out
 		   and will come back later. */
-		DRM_ERROR("Cannot find any crtc or sizes - going 1024x768\n");
+		DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 		sizes.fb_width = sizes.surface_width = 1024;
 		sizes.fb_height = sizes.surface_height = 768;
 	}
@@ -1292,123 +1282,46 @@ bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
 	 * we shouldn't end up with no modes here.
 	 */
 	if (count == 0) {
-		if (fb_helper->poll_enabled) {
-			delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work,
-						  5*HZ);
-			printk(KERN_INFO "No connectors reported connected with modes - started polling\n");
-		} else
-			printk(KERN_INFO "No connectors reported connected with modes\n");
+		printk(KERN_INFO "No connectors reported connected with modes\n");
 	}
 	drm_setup_crtcs(fb_helper);
 
 	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
 }
 EXPORT_SYMBOL(drm_fb_helper_initial_config);
 
-/* we got a hotplug irq - need to update fbcon */
-void drm_helper_fb_hpd_irq_event(struct drm_fb_helper *fb_helper)
-{
-	/* if we don't have the fbdev registered yet do nothing */
-	if (!fb_helper->fbdev)
-		return;
-
-	/* schedule a slow work asap */
-	delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 0);
-}
-EXPORT_SYMBOL(drm_helper_fb_hpd_irq_event);
-
-bool drm_helper_fb_hotplug_event(struct drm_fb_helper *fb_helper, bool polled)
+bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 {
 	int count = 0;
-	int ret;
 	u32 max_width, max_height, bpp_sel;
-
-	if (!fb_helper->fb)
-		return false;
-	DRM_DEBUG_KMS("\n");
-
-	max_width = fb_helper->fb->width;
-	max_height = fb_helper->fb->height;
-	bpp_sel = fb_helper->fb->bits_per_pixel;
-
-	count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
-						    max_height);
-	if (fb_helper->poll_enabled && !polled) {
-		if (count) {
-			delayed_slow_work_cancel(&fb_helper->output_status_change_slow_work);
-		} else {
-			ret = delayed_slow_work_enqueue(&fb_helper->output_status_change_slow_work, 5*HZ);
-		}
-	}
-	drm_setup_crtcs(fb_helper);
-
-	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
-}
-EXPORT_SYMBOL(drm_helper_fb_hotplug_event);
-
-/*
- * delayed work queue execution function
- * - check if fbdev is actually in use on the gpu
- *   - if not set delayed flag and repoll if necessary
- * - check for connector status change
- * - repoll if 0 modes found
- *- call driver output status changed notifier
- */
-static void output_status_change_execute(struct slow_work *work)
-{
-	struct delayed_slow_work *delayed_work = container_of(work, struct delayed_slow_work, work);
-	struct drm_fb_helper *fb_helper = container_of(delayed_work, struct drm_fb_helper, output_status_change_slow_work);
-	struct drm_connector *connector;
-	enum drm_connector_status old_status, status;
-	bool repoll, changed = false;
-	int ret;
-	int i;
 	bool bound = false, crtcs_bound = false;
 	struct drm_crtc *crtc;
 
-	repoll = fb_helper->poll_enabled;
+	if (!fb_helper->fb)
+		return false;
 
-	/* first of all check the fbcon framebuffer is actually bound to any crtc */
-	/* take into account that no crtc at all maybe bound */
 	list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
 		if (crtc->fb)
 			crtcs_bound = true;
 		if (crtc->fb == fb_helper->fb)
 			bound = true;
 	}
 
-	if (bound == false && crtcs_bound) {
+	if (!bound && crtcs_bound) {
 		fb_helper->delayed_hotplug = true;
-		goto requeue;
+		return false;
 	}
+	DRM_DEBUG_KMS("\n");
 
-	for (i = 0; i < fb_helper->connector_count; i++) {
-		connector = fb_helper->connector_info[i]->connector;
-		old_status = connector->status;
-		status = connector->funcs->detect(connector);
-		if (old_status != status) {
-			changed = true;
-		}
-		if (status == connector_status_connected && repoll) {
-			DRM_DEBUG("%s is connected - stop polling\n", drm_get_connector_name(connector));
-			repoll = false;
-		}
-	}
+	max_width = fb_helper->fb->width;
+	max_height = fb_helper->fb->height;
+	bpp_sel = fb_helper->fb->bits_per_pixel;
 
-	if (changed) {
-		if (fb_helper->funcs->fb_output_status_changed)
-			fb_helper->funcs->fb_output_status_changed(fb_helper);
-	}
+	count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
+						    max_height);
+	drm_setup_crtcs(fb_helper);
 
-requeue:
-	if (repoll) {
-		ret = delayed_slow_work_enqueue(delayed_work, 5*HZ);
-		if (ret)
-			DRM_ERROR("delayed enqueue failed %d\n", ret);
-	}
+	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
 }
-
-static struct slow_work_ops output_status_change_ops = {
-	.execute = output_status_change_execute,
-};
+EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
 

drivers/gpu/drm/i915/i915_dma.c

@@ -1493,7 +1493,7 @@ static int i915_load_modeset_init(struct drm_device *dev,
 	I915_WRITE(INSTPM, (1 << 5) | (1 << 21));
 
 	intel_fbdev_init(dev);
-
+	drm_kms_helper_poll_init(dev);
 	return 0;
 
 destroy_ringbuffer:

drivers/gpu/drm/i915/i915_irq.c

@@ -271,8 +271,7 @@ static void i915_hotplug_work_func(struct work_struct *work)
 		}
 	}
 	/* Just fire off a uevent and let userspace tell us what to do */
-	intelfb_hotplug(dev, false);
-	drm_sysfs_hotplug_event(dev);
+	drm_helper_hpd_irq_event(dev);
 }
 
 static void i915_handle_rps_change(struct drm_device *dev)

drivers/gpu/drm/i915/intel_crt.c

@@ -577,5 +577,10 @@ void intel_crt_init(struct drm_device *dev)
 
 	drm_sysfs_connector_add(connector);
 
+	if (I915_HAS_HOTPLUG(dev))
+		connector->polled = DRM_CONNECTOR_POLL_HPD;
+	else
+		connector->polled = DRM_CONNECTOR_POLL_CONNECT;
+
 	dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 }

drivers/gpu/drm/i915/intel_display.c

@@ -4959,6 +4959,7 @@ intel_user_framebuffer_create(struct drm_device *dev,
 
 static const struct drm_mode_config_funcs intel_mode_funcs = {
 	.fb_create = intel_user_framebuffer_create,
+	.output_poll_changed = intel_fb_output_poll_changed,
 };
 
 static struct drm_gem_object *
@@ -5346,6 +5347,7 @@ void intel_modeset_cleanup(struct drm_device *dev)
 
 	mutex_lock(&dev->struct_mutex);
 
+	drm_kms_helper_poll_fini(dev);
 	intel_fbdev_fini(dev);
 
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {

drivers/gpu/drm/i915/intel_dp.c

@@ -1392,6 +1392,8 @@ intel_dp_init(struct drm_device *dev, int output_reg)
 			   DRM_MODE_CONNECTOR_DisplayPort);
 	drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
 
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+
 	if (output_reg == DP_A)
 		intel_encoder->type = INTEL_OUTPUT_EDP;
 	else

drivers/gpu/drm/i915/intel_drv.h

@@ -235,5 +235,5 @@ extern int intel_overlay_put_image(struct drm_device *dev, void *data,
 extern int intel_overlay_attrs(struct drm_device *dev, void *data,
 			       struct drm_file *file_priv);
 
-void intelfb_hotplug(struct drm_device *dev, bool polled);
+extern void intel_fb_output_poll_changed(struct drm_device *dev);
 #endif /* __INTEL_DRV_H__ */