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Merge back earlier ACPI backlight material for 3.19-rc1.

hifive-unleashed-5.1
Rafael J. Wysocki 2014-12-08 19:53:09 +01:00
parent 35d0565b95 dce4ec2e45
commit 667ae4ee6c
1 changed files with 15 additions and 0 deletions
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15
drivers/acpi/video.c
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@ -1681,6 +1681,19 @@ static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
printk(KERN_ERR PREFIX "Create sysfs link\n");
}
static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
{
struct acpi_video_device *dev;
union acpi_object *levels;
mutex_lock(&video->device_list_lock);
list_for_each_entry(dev, &video->video_device_list, entry) {
if (!acpi_video_device_lcd_query_levels(dev, &levels))
kfree(levels);
}
mutex_unlock(&video->device_list_lock);
}
static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
{
struct acpi_video_device *dev;
@ -1688,6 +1701,8 @@ 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_verify_backlight_support())
return 0;