1 files changed, 89 insertions, 118 deletions

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 42ede059728c..32953646caeb 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -47,9 +47,6 @@ module_param(brightness_switch_enabled, bool, 0644);
 static bool allow_duplicates;
 module_param(allow_duplicates, bool, 0644);
 
-static int disable_backlight_sysfs_if = -1;
-module_param(disable_backlight_sysfs_if, int, 0444);
-
 #define REPORT_OUTPUT_KEY_EVENTS		0x01
 #define REPORT_BRIGHTNESS_KEY_EVENTS		0x02
 static int report_key_events = -1;
@@ -73,6 +70,17 @@ module_param(device_id_scheme, bool, 0444);
 static int only_lcd = -1;
 module_param(only_lcd, int, 0444);
 
+/*
+ * Display probing is known to take up to 5 seconds, so delay the fallback
+ * backlight registration by 5 seconds + 3 seconds for some extra margin.
+ */
+static int register_backlight_delay = 8;
+module_param(register_backlight_delay, int, 0444);
+MODULE_PARM_DESC(register_backlight_delay,
+	"Delay in seconds before doing fallback (non GPU driver triggered) "
+	"backlight registration, set to 0 to disable.");
+
+static bool may_report_brightness_keys;
 static int register_count;
 static DEFINE_MUTEX(register_count_mutex);
 static DEFINE_MUTEX(video_list_lock);
@@ -80,7 +88,9 @@ static LIST_HEAD(video_bus_head);
 static int acpi_video_bus_add(struct acpi_device *device);
 static int acpi_video_bus_remove(struct acpi_device *device);
 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
-void acpi_video_detect_exit(void);
+static void acpi_video_bus_register_backlight_work(struct work_struct *ignored);
+static DECLARE_DELAYED_WORK(video_bus_register_backlight_work,
+			    acpi_video_bus_register_backlight_work);
 
 /*
  * Indices in the _BCL method response: the first two items are special,
@@ -381,14 +391,6 @@ static int video_set_bqc_offset(const struct dmi_system_id *d)
 	return 0;
 }
 
-static int video_disable_backlight_sysfs_if(
-	const struct dmi_system_id *d)
-{
-	if (disable_backlight_sysfs_if == -1)
-		disable_backlight_sysfs_if = 1;
-	return 0;
-}
-
 static int video_set_device_id_scheme(const struct dmi_system_id *d)
 {
 	device_id_scheme = true;
@@ -462,40 +464,6 @@ static const struct dmi_system_id video_dmi_table[] = {
 	},
 
 	/*
-	 * Some machines have a broken acpi-video interface for brightness
-	 * control, but still need an acpi_video_device_lcd_set_level() call
-	 * on resume to turn the backlight power on.  We Enable backlight
-	 * control on these systems, but do not register a backlight sysfs
-	 * as brightness control does not work.
-	 */
-	{
-	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
-	 .callback = video_disable_backlight_sysfs_if,
-	 .ident = "Toshiba Portege R700",
-	 .matches = {
-		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
-		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
-		},
-	},
-	{
-	 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
-	 .callback = video_disable_backlight_sysfs_if,
-	 .ident = "Toshiba Portege R830",
-	 .matches = {
-		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
-		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
-		},
-	},
-	{
-	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
-	 .callback = video_disable_backlight_sysfs_if,
-	 .ident = "Toshiba Satellite R830",
-	 .matches = {
-		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
-		DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
-		},
-	},
-	/*
 	 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
 	 * but the IDs actually follow the Device ID Scheme.
 	 */
@@ -1149,24 +1117,25 @@ acpi_video_get_device_type(struct acpi_video_bus *video,
 	return 0;
 }
 
-static int
-acpi_video_bus_get_one_device(struct acpi_device *device,
-			      struct acpi_video_bus *video)
+static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg)
 {
-	unsigned long long device_id;
-	int status, device_type;
-	struct acpi_video_device *data;
+	struct acpi_video_bus *video = arg;
 	struct acpi_video_device_attrib *attribute;
+	struct acpi_video_device *data;
+	unsigned long long device_id;
+	acpi_status status;
+	int device_type;
 
-	status =
-	    acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
-	/* Some device omits _ADR, we skip them instead of fail */
+	status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
+	/* Skip devices without _ADR instead of failing. */
 	if (ACPI_FAILURE(status))
-		return 0;
+		goto exit;
 
 	data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
-	if (!data)
+	if (!data) {
+		dev_dbg(&device->dev, "Cannot attach\n");
 		return -ENOMEM;
+	}
 
 	strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
@@ -1222,11 +1191,16 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
 	acpi_video_device_bind(video, data);
 	acpi_video_device_find_cap(data);
 
+	if (data->cap._BCM && data->cap._BCL)
+		may_report_brightness_keys = true;
+
 	mutex_lock(&video->device_list_lock);
 	list_add_tail(&data->entry, &video->video_device_list);
 	mutex_unlock(&video->device_list_lock);
 
-	return status;
+exit:
+	video->child_count++;
+	return 0;
 }
 
 /*
@@ -1538,9 +1512,6 @@ static int
 acpi_video_bus_get_devices(struct acpi_video_bus *video,
 			   struct acpi_device *device)
 {
-	int status = 0;
-	struct acpi_device *dev;
-
 	/*
 	 * There are systems where video module known to work fine regardless
 	 * of broken _DOD and ignoring returned value here doesn't cause
@@ -1548,16 +1519,7 @@ acpi_video_bus_get_devices(struct acpi_video_bus *video,
 	 */
 	acpi_video_device_enumerate(video);
 
-	list_for_each_entry(dev, &device->children, node) {
-
-		status = acpi_video_bus_get_one_device(dev, video);
-		if (status) {
-			dev_err(&dev->dev, "Can't attach device\n");
-			break;
-		}
-		video->child_count++;
-	}
-	return status;
+	return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);
 }
 
 /* acpi_video interface */
@@ -1689,6 +1651,9 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
 		break;
 	}
 
+	if (keycode)
+		may_report_brightness_keys = true;
+
 	acpi_notifier_call_chain(device, event, 0);
 
 	if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
@@ -1707,24 +1672,23 @@ static int acpi_video_resume(struct notifier_block *nb,
 	int i;
 
 	switch (val) {
-	case PM_HIBERNATION_PREPARE:
-	case PM_SUSPEND_PREPARE:
-	case PM_RESTORE_PREPARE:
-		return NOTIFY_DONE;
-	}
-
-	video = container_of(nb, struct acpi_video_bus, pm_nb);
-
-	dev_info(&video->device->dev, "Restoring backlight state\n");
+	case PM_POST_HIBERNATION:
+	case PM_POST_SUSPEND:
+	case PM_POST_RESTORE:
+		video = container_of(nb, struct acpi_video_bus, pm_nb);
+
+		dev_info(&video->device->dev, "Restoring backlight state\n");
+
+		for (i = 0; i < video->attached_count; i++) {
+			video_device = video->attached_array[i].bind_info;
+			if (video_device && video_device->brightness)
+				acpi_video_device_lcd_set_level(video_device,
+						video_device->brightness->curr);
+		}
 
-	for (i = 0; i < video->attached_count; i++) {
-		video_device = video->attached_array[i].bind_info;
-		if (video_device && video_device->brightness)
-			acpi_video_device_lcd_set_level(video_device,
-					video_device->brightness->curr);
+		return NOTIFY_OK;
 	}
-
-	return NOTIFY_OK;
+	return NOTIFY_DONE;
 }
 
 static acpi_status
@@ -1733,13 +1697,12 @@ acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
 {
 	struct acpi_device *device = context;
 	struct acpi_device *sibling;
-	int result;
 
 	if (handle == device->handle)
 		return AE_CTRL_TERMINATE;
 
-	result = acpi_bus_get_device(handle, &sibling);
-	if (result)
+	sibling = acpi_fetch_acpi_dev(handle);
+	if (!sibling)
 		return AE_OK;
 
 	if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
@@ -1762,9 +1725,6 @@ static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
 	if (result)
 		return;
 
-	if (disable_backlight_sysfs_if > 0)
-		return;
-
 	name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 	if (!name)
 		return;
@@ -1863,8 +1823,6 @@ static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
 	if (video->backlight_registered)
 		return 0;
 
-	acpi_video_run_bcl_for_osi(video);
-
 	if (acpi_video_get_backlight_type() != acpi_backlight_video)
 		return 0;
 
@@ -2034,7 +1992,7 @@ static int acpi_video_bus_add(struct acpi_device *device)
 	acpi_status status;
 
 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
-				device->parent->handle, 1,
+				acpi_dev_parent(device)->handle, 1,
 				acpi_video_bus_match, NULL,
 				device, NULL);
 	if (status == AE_ALREADY_EXISTS) {
@@ -2090,7 +2048,11 @@ static int acpi_video_bus_add(struct acpi_device *device)
 	list_add_tail(&video->entry, &video_bus_head);
 	mutex_unlock(&video_list_lock);
 
-	acpi_video_bus_register_backlight(video);
+	/*
+	 * The userspace visible backlight_device gets registered separately
+	 * from acpi_video_register_backlight().
+	 */
+	acpi_video_run_bcl_for_osi(video);
 	acpi_video_bus_add_notify_handler(video);
 
 	return 0;
@@ -2115,20 +2077,25 @@ static int acpi_video_bus_remove(struct acpi_device *device)
 
 	video = acpi_driver_data(device);
 
-	acpi_video_bus_remove_notify_handler(video);
-	acpi_video_bus_unregister_backlight(video);
-	acpi_video_bus_put_devices(video);
-
 	mutex_lock(&video_list_lock);
 	list_del(&video->entry);
 	mutex_unlock(&video_list_lock);
 
+	acpi_video_bus_remove_notify_handler(video);
+	acpi_video_bus_unregister_backlight(video);
+	acpi_video_bus_put_devices(video);
+
 	kfree(video->attached_array);
 	kfree(video);
 
 	return 0;
 }
 
+static void acpi_video_bus_register_backlight_work(struct work_struct *ignored)
+{
+	acpi_video_register_backlight();
+}
+
 static int __init is_i740(struct pci_dev *dev)
 {
 	if (dev->device == 0x00D1)
@@ -2239,6 +2206,18 @@ int acpi_video_register(void)
 	 */
 	register_count = 1;
 
+	/*
+	 * acpi_video_bus_add() skips registering the userspace visible
+	 * backlight_device. The intend is for this to be registered by the
+	 * drm/kms driver calling acpi_video_register_backlight() *after* it is
+	 * done setting up its own native backlight device. The delayed work
+	 * ensures that acpi_video_register_backlight() always gets called
+	 * eventually, in case there is no drm/kms driver or it is disabled.
+	 */
+	if (register_backlight_delay)
+		schedule_delayed_work(&video_bus_register_backlight_work,
+				      register_backlight_delay * HZ);
+
 leave:
 	mutex_unlock(&register_count_mutex);
 	return ret;
@@ -2249,36 +2228,29 @@ void acpi_video_unregister(void)
 {
 	mutex_lock(&register_count_mutex);
 	if (register_count) {
+		cancel_delayed_work_sync(&video_bus_register_backlight_work);
 		acpi_bus_unregister_driver(&acpi_video_bus);
 		register_count = 0;
+		may_report_brightness_keys = false;
 	}
 	mutex_unlock(&register_count_mutex);
 }
 EXPORT_SYMBOL(acpi_video_unregister);
 
-void acpi_video_unregister_backlight(void)
+void acpi_video_register_backlight(void)
 {
 	struct acpi_video_bus *video;
 
-	mutex_lock(&register_count_mutex);
-	if (register_count) {
-		mutex_lock(&video_list_lock);
-		list_for_each_entry(video, &video_bus_head, entry)
-			acpi_video_bus_unregister_backlight(video);
-		mutex_unlock(&video_list_lock);
-	}
-	mutex_unlock(&register_count_mutex);
+	mutex_lock(&video_list_lock);
+	list_for_each_entry(video, &video_bus_head, entry)
+		acpi_video_bus_register_backlight(video);
+	mutex_unlock(&video_list_lock);
 }
+EXPORT_SYMBOL(acpi_video_register_backlight);
 
 bool acpi_video_handles_brightness_key_presses(void)
 {
-	bool have_video_busses;
-
-	mutex_lock(&video_list_lock);
-	have_video_busses = !list_empty(&video_bus_head);
-	mutex_unlock(&video_list_lock);
-
-	return have_video_busses &&
+	return may_report_brightness_keys &&
 	       (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
 }
 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
@@ -2311,7 +2283,6 @@ static int __init acpi_video_init(void)
 
 static void __exit acpi_video_exit(void)
 {
-	acpi_video_detect_exit();
 	acpi_video_unregister();
 }