Merge tag 'backlight-detect-refactor-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86 into drm-misc-next

Immutable backlight-detect-refactor branch between acpi, drm-* and pdx86

Tag (immutable branch) with v6.0-rc1 + the (acpi/x86) backlight
detect refactor work. For merging into the acpi, drm-* and pdx86
subsystems.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

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# gpg: Signature made Mon 05 Sep 2022 09:25:44 AM IST
# gpg:                using RSA key BAF03B5D2718411A5E9E177E92EC4779440327DC
# gpg:                issuer "hdegoede@redhat.com"
# gpg: Can't check signature: No public key
From: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/261afe3d-7790-e945-adf6-a2c96c9b1eff@redhat.com

4 files changed, 38 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
index e78430001f07..9df78e7caa2b 100644
--- a/drivers/gpu/drm/i915/display/intel_acpi.c
+++ b/drivers/gpu/drm/i915/display/intel_acpi.c
@@ -7,6 +7,7 @@
 
 #include <linux/pci.h>
 #include <linux/acpi.h>
+#include <acpi/video.h>
 
 #include "i915_drv.h"
 #include "intel_acpi.h"
@@ -331,3 +332,29 @@ void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915)
 	 */
 	fwnode_handle_put(fwnode);
 }
+
+void intel_acpi_video_register(struct drm_i915_private *i915)
+{
+	struct drm_connector_list_iter conn_iter;
+	struct drm_connector *connector;
+
+	acpi_video_register();
+
+	/*
+	 * If i915 is driving an internal panel without registering its native
+	 * backlight handler try to register the acpi_video backlight.
+	 * For panels not driven by i915 another GPU driver may still register
+	 * a native backlight later and acpi_video_register_backlight() should
+	 * only be called after any native backlights have been registered.
+	 */
+	drm_connector_list_iter_begin(&i915->drm, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		struct intel_panel *panel = &to_intel_connector(connector)->panel;
+
+		if (panel->backlight.funcs && !panel->backlight.device) {
+			acpi_video_register_backlight();
+			break;
+		}
+	}
+	drm_connector_list_iter_end(&conn_iter);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_acpi.h b/drivers/gpu/drm/i915/display/intel_acpi.h
index 4a760a2baed9..6a0007452f95 100644
--- a/drivers/gpu/drm/i915/display/intel_acpi.h
+++ b/drivers/gpu/drm/i915/display/intel_acpi.h
@@ -14,6 +14,7 @@ void intel_unregister_dsm_handler(void);
 void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915);
 void intel_acpi_device_id_update(struct drm_i915_private *i915);
 void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915);
+void intel_acpi_video_register(struct drm_i915_private *i915);
 #else
 static inline void intel_register_dsm_handler(void) { return; }
 static inline void intel_unregister_dsm_handler(void) { return; }
@@ -23,6 +24,8 @@ static inline
 void intel_acpi_device_id_update(struct drm_i915_private *i915) { return; }
 static inline
 void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915) { return; }
+static inline
+void intel_acpi_video_register(struct drm_i915_private *i915) { return; }
 #endif /* CONFIG_ACPI */
 
 #endif /* __INTEL_ACPI_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c
index 110fc98ec280..84639e9df5c9 100644
--- a/drivers/gpu/drm/i915/display/intel_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_backlight.c
@@ -8,6 +8,8 @@
 #include <linux/pwm.h>
 #include <linux/string_helpers.h>
 
+#include <acpi/video.h>
+
 #include "intel_backlight.h"
 #include "intel_connector.h"
 #include "intel_de.h"
@@ -950,6 +952,11 @@ int intel_backlight_device_register(struct intel_connector *connector)
 
 	WARN_ON(panel->backlight.max == 0);
 
+	if (!acpi_video_backlight_use_native()) {
+		drm_info(&i915->drm, "Skipping intel_backlight registration\n");
+		return 0;
+	}
+
 	memset(&props, 0, sizeof(props));
 	props.type = BACKLIGHT_RAW;
 
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index f4f7c3414762..40fbf8a296e2 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -9089,7 +9089,7 @@ void intel_display_driver_register(struct drm_i915_private *i915)
 
 	/* Must be done after probing outputs */
 	intel_opregion_register(i915);
-	acpi_video_register();
+	intel_acpi_video_register(i915);
 
 	intel_audio_init(i915);