Merge tag 'drm-misc-next-2022-09-23' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

drm-misc-next for 6.1:

UAPI Changes:

Cross-subsystem Changes:
  - dma-buf: Improve signaling when debugging

Core Changes:
  - Backlight handling improvements
  - format-helper: Add drm_fb_build_fourcc_list()
  - fourcc: Kunit tests improvements
  - modes: Add DRM_MODE_INIT() macro
  - plane: Remove drm_plane_init(), Allocate planes with drm_universal_plane_alloc()
  - plane-helper: Add drm_plane_helper_atomic_check()
  - probe-helper: Add drm_connector_helper_get_modes_fixed() and
    drm_crtc_helper_mode_valid_fixed()
  - tests: Conversion to parametrized tests, test name consistency

Driver Changes:
  - amdgpu: Fix for a VRAM eviction issue
  - ast: Resolution handling improvements
  - mediatek: small code improvements for DP
  - omap: Refcounting fix, small improvements
  - rockchip: RK3568 support, Gamma support for RK3399
  - sun4i: Build failure fix when !OF
  - udl: Multiple fixes here and there
  - vc4: HDMI hotplug handling improvements
  - vkms: Warning fix

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220923073943.d43tne5hni3iknlv@houat

1 files changed, 27 insertions, 0 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);
+}