diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 3a50a34fe176b34bb77a3ff8cfff9588fe523da8..227aca77ee1ef7777277d34a4b5e5774efa1286e 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -164,4 +164,15 @@ struct platform_device;
int acpi_create_platform_device(struct acpi_device *adev,
const struct acpi_device_id *id);
+/*--------------------------------------------------------------------------
+ Video
+ -------------------------------------------------------------------------- */
+#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)
+bool acpi_video_backlight_quirks(void);
+bool acpi_video_verify_backlight_support(void);
+#else
+static inline bool acpi_video_backlight_quirks(void) { return false; }
+static inline bool acpi_video_verify_backlight_support(void) { return false; }
+#endif
+
#endif /* _ACPI_INTERNAL_H_ */
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f236e172d948979bc40230b97a0512a1c8085d08..e9d4bb60c35c1c98f22bdbf3617a75b09d9767e8 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -44,6 +44,8 @@
#include <linux/suspend.h>
#include <acpi/video.h>
+#include "internal.h"
+
#define PREFIX "ACPI: "
#define ACPI_VIDEO_BUS_NAME "Video Bus"
@@ -901,7 +903,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
if (acpi_video_init_brightness(device))
return;
- if (acpi_video_backlight_support()) {
+ if (acpi_video_verify_backlight_support()) {
struct backlight_properties props;
struct pci_dev *pdev;
acpi_handle acpi_parent;
@@ -1356,8 +1358,8 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
unsigned long long level_current, level_next;
int result = -EINVAL;
- /* no warning message if acpi_backlight=vendor is used */
- if (!acpi_video_backlight_support())
+ /* no warning message if acpi_backlight=vendor or a quirk is used */
+ if (!acpi_video_verify_backlight_support())
return 0;
if (!device->brightness)
@@ -1859,6 +1861,46 @@ static int acpi_video_bus_remove(struct acpi_device *device)
return 0;
}
+static acpi_status video_unregister_backlight(acpi_handle handle, u32 lvl,
+ void *context, void **rv)
+{
+ struct acpi_device *acpi_dev;
+ struct acpi_video_bus *video;
+ struct acpi_video_device *dev, *next;
+
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return AE_OK;
+
+ if (acpi_match_device_ids(acpi_dev, video_device_ids))
+ return AE_OK;
+
+ video = acpi_driver_data(acpi_dev);
+ if (!video)
+ return AE_OK;
+
+ acpi_video_bus_stop_devices(video);
+ mutex_lock(&video->device_list_lock);
+ list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
+ if (dev->backlight) {
+ backlight_device_unregister(dev->backlight);
+ dev->backlight = NULL;
+ kfree(dev->brightness->levels);
+ kfree(dev->brightness);
+ }
+ if (dev->cooling_dev) {
+ sysfs_remove_link(&dev->dev->dev.kobj,
+ "thermal_cooling");
+ sysfs_remove_link(&dev->cooling_dev->device.kobj,
+ "device");
+ thermal_cooling_device_unregister(dev->cooling_dev);
+ dev->cooling_dev = NULL;
+ }
+ }
+ mutex_unlock(&video->device_list_lock);
+ acpi_video_bus_start_devices(video);
+ return AE_OK;
+}
+
static int __init is_i740(struct pci_dev *dev)
{
if (dev->device == 0x00D1)
@@ -1890,14 +1932,25 @@ static int __init intel_opregion_present(void)
return opregion;
}
-int acpi_video_register(void)
+int __acpi_video_register(bool backlight_quirks)
{
- int result = 0;
+ bool no_backlight;
+ int result;
+
+ no_backlight = backlight_quirks ? acpi_video_backlight_quirks() : false;
+
if (register_count) {
/*
- * if the function of acpi_video_register is already called,
- * don't register the acpi_vide_bus again and return no error.
+ * If acpi_video_register() has been called already, don't try
+ * to register acpi_video_bus, but unregister backlight devices
+ * if no backlight support is requested.
*/
+ if (no_backlight)
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX,
+ video_unregister_backlight,
+ NULL, NULL, NULL);
+
return 0;
}
@@ -1913,7 +1966,7 @@ int acpi_video_register(void)
return 0;
}
-EXPORT_SYMBOL(acpi_video_register);
+EXPORT_SYMBOL(__acpi_video_register);
void acpi_video_unregister(void)
{
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index e6bd910bc6edee4b55e3b6de7888bdd5c5ec06f6..826e52def08074bad91038ad25df387917b690ec 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -38,6 +38,8 @@
#include <linux/dmi.h>
#include <linux/pci.h>
+#include "internal.h"
+
#define PREFIX "ACPI: "
ACPI_MODULE_NAME("video");
@@ -234,6 +236,17 @@ static void acpi_video_caps_check(void)
acpi_video_get_capabilities(NULL);
}
+bool acpi_video_backlight_quirks(void)
+{
+ if (acpi_gbl_osi_data >= ACPI_OSI_WIN_8) {
+ acpi_video_caps_check();
+ acpi_video_support |= ACPI_VIDEO_SKIP_BACKLIGHT;
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL(acpi_video_backlight_quirks);
+
/* Promote the vendor interface instead of the generic video module.
* This function allow DMI blacklists to be implemented by externals
* platform drivers instead of putting a big blacklist in video_detect.c
@@ -278,6 +291,14 @@ int acpi_video_backlight_support(void)
}
EXPORT_SYMBOL(acpi_video_backlight_support);
+/* For the ACPI video driver use only. */
+bool acpi_video_verify_backlight_support(void)
+{
+ return (acpi_video_support & ACPI_VIDEO_SKIP_BACKLIGHT) ?
+ false : acpi_video_backlight_support();
+}
+EXPORT_SYMBOL(acpi_video_verify_backlight_support);
+
/*
* Use acpi_backlight=vendor/video to force that backlight switching
* is processed by vendor specific acpi drivers or video.ko driver.
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index adb319b53ecd4acb98e1ce35f599ea935ff83dce..cf188ab7051a6b213e0ebb945fde92fc869b0ce6 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1648,7 +1648,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
if (INTEL_INFO(dev)->num_pipes) {
/* Must be done after probing outputs */
intel_opregion_init(dev);
- acpi_video_register();
+ acpi_video_register_with_quirks();
}
if (IS_GEN5(dev))
diff --git a/include/acpi/video.h b/include/acpi/video.h
index 61109f2609fc3ee446ec43e242875b28ae719344..b26dc4fb7ba8283f22b0d8f646a58a06fd00d510 100644
--- a/include/acpi/video.h
+++ b/include/acpi/video.h
@@ -17,12 +17,21 @@ struct acpi_device;
#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
-extern int acpi_video_register(void);
+extern int __acpi_video_register(bool backlight_quirks);
+static inline int acpi_video_register(void)
+{
+ return __acpi_video_register(false);
+}
+static inline int acpi_video_register_with_quirks(void)
+{
+ return __acpi_video_register(true);
+}
extern void acpi_video_unregister(void);
extern int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid);
#else
static inline int acpi_video_register(void) { return 0; }
+static inline int acpi_video_register_with_quirks(void) { return 0; }
static inline void acpi_video_unregister(void) { return; }
static inline int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 353ba256f3681e4f6ddd8b18b9feba61b1d98cec..6ad72f92469c556368742f7c2d3301acfcfd5a0c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -191,6 +191,7 @@ extern bool wmi_has_guid(const char *guid);
#define ACPI_VIDEO_BACKLIGHT_DMI_VIDEO 0x0200
#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR 0x0400
#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO 0x0800
+#define ACPI_VIDEO_SKIP_BACKLIGHT 0x1000
#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)