diff options
| author | Mario Limonciello <mario.limonciello@amd.com> | 2022-12-08 10:42:05 -0600 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-12-22 17:26:41 +0100 |
| commit | 00a734104af7d878f1252d49eff9298785c6cbdc (patch) | |
| tree | aeb155c40134c3e41d2bc0f64276812d3cbc5880 /drivers/acpi | |
| parent | 057b40f43ce429a02e793adf3cfbf2446a19a38e (diff) | |
ACPI: video: Allow GPU drivers to report no panels
The current logic for the ACPI backlight detection will create
a backlight device if no native or vendor drivers have created
8 seconds after the system has booted if the ACPI tables
included backlight control methods.
If the GPU drivers have loaded, they may be able to report whether
any LCD panels were found. Allow using this information to factor
in whether to enable the fallback logic for making an acpi_video0
backlight device.
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpi_video.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index 30d8fd03fec7..75dc37affff2 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -2176,6 +2176,17 @@ static bool should_check_lcd_flag(void) return false; } +/* + * At least one graphics driver has reported that no LCD is connected + * via the native interface. cancel the registration for fallback acpi_video0. + * If another driver still deems this necessary, it can explicitly register it. + */ +void acpi_video_report_nolcd(void) +{ + cancel_delayed_work(&video_bus_register_backlight_work); +} +EXPORT_SYMBOL(acpi_video_report_nolcd); + int acpi_video_register(void) { int ret = 0; |