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List:       git-commits-head
Subject:    ACPI: video: Allow GPU drivers to report no panels
From:       Linux Kernel Mailing List <linux-kernel () vger ! kernel ! org>
Date:       2022-12-30 18:50:52
Message-ID: git-mailbomb-linux-master-00a734104af7d878f1252d49eff9298785c6cbdc () kernel ! org
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Commit:     00a734104af7d878f1252d49eff9298785c6cbdc
Parent:     057b40f43ce429a02e793adf3cfbf2446a19a38e
Refname:    refs/heads/master
Web:        https://git.kernel.org/torvalds/c/00a734104af7d878f1252d49eff9298785c6cbdc
Author:     Mario Limonciello <mario.limonciello@amd.com>
AuthorDate: Thu Dec 8 10:42:05 2022 -0600
Committer:  Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CommitDate: Thu Dec 22 17:26:41 2022 +0100

    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>
---
 drivers/acpi/acpi_video.c | 11 +++++++++++
 include/acpi/video.h      |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 30d8fd03fec7c..75dc37affff25 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;
diff --git a/include/acpi/video.h b/include/acpi/video.h
index a275c35e5249d..8ed9bec03e534 100644
--- a/include/acpi/video.h
+++ b/include/acpi/video.h
@@ -53,6 +53,7 @@ enum acpi_backlight_type {
 };
 
 #if IS_ENABLED(CONFIG_ACPI_VIDEO)
+extern void acpi_video_report_nolcd(void);
 extern int acpi_video_register(void);
 extern void acpi_video_unregister(void);
 extern void acpi_video_register_backlight(void);
@@ -69,6 +70,7 @@ extern int acpi_video_get_levels(struct acpi_device *device,
 				 struct acpi_video_device_brightness **dev_br,
 				 int *pmax_level);
 #else
+static inline void acpi_video_report_nolcd(void) { return; };
 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; }
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