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ACPI: video: Make backlight class device registration a separate step (v2)

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On x86/ACPI boards the acpi_video driver will usually initialize before
the kms driver (except i915). This causes /sys/class/backlight/acpi_video0
to show up and then the kms driver registers its own native backlight
device after which the drivers/acpi/video_detect.c code unregisters
the acpi_video0 device (when acpi_video_get_backlight_type()==native).

This means that userspace briefly sees 2 devices and the disappearing of
acpi_video0 after a brief time confuses the systemd backlight level
save/restore code, see e.g.:
https://bbs.archlinux.org/viewtopic.php?id=269920

To fix this make backlight class device registration a separate step
done by a new acpi_video_register_backlight() function. The intend is for
this to be called by the drm/kms driver *after* it is done setting up its
own native backlight device. So that acpi_video_get_backlight_type() knows
if a native backlight will be available or not at acpi_video backlight
registration time, avoiding the add + remove dance.

Note the new acpi_video_register_backlight() function is also called from
a delayed work to ensure that the acpi_video backlight devices does get
registered if necessary even if there is no drm/kms driver or when it is
disabled.

Changes in v2:
- Make register_backlight_delay a module parameter, mainly so that it can
  be disabled by Nvidia binary driver users

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2022-04-28 17:41:46 +02:00
parent 038a8191ae
commit 3dbc80a3e4
2 changed files with 49 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

50
drivers/acpi/acpi_video.c
View file

@ -73,6 +73,16 @@ 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);
@ -81,6 +91,9 @@ 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);
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);
void acpi_video_detect_exit(void);
/*
@ -1859,8 +1872,6 @@ 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;
@ -2086,7 +2097,11 @@ 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;
@ -2125,6 +2140,11 @@ static int acpi_video_bus_remove(struct acpi_device *device)
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)
@ -2235,6 +2255,18 @@ 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;
@ -2245,6 +2277,7 @@ 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;
@ -2253,6 +2286,17 @@ void acpi_video_unregister(void)
}
EXPORT_SYMBOL(acpi_video_unregister);
void acpi_video_register_backlight(void)
{
struct acpi_video_bus *video;
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);
void acpi_video_unregister_backlight(void)
{
struct acpi_video_bus *video;

2
include/acpi/video.h
View file

@ -53,6 +53,7 @@ enum acpi_backlight_type {
#if IS_ENABLED(CONFIG_ACPI_VIDEO)
extern int acpi_video_register(void);
extern void acpi_video_unregister(void);
extern void acpi_video_register_backlight(void);
extern int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid);
extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
@ -69,6 +70,7 @@ extern int acpi_video_get_levels(struct acpi_device *device,
#else
static inline int acpi_video_register(void) { return -ENODEV; }
static inline void acpi_video_unregister(void) { return; }
static inline void acpi_video_register_backlight(void) { return; }
static inline int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid)
{