[Intel-gfx] [PATCH] ACPI / video: update the skip case for acpi_video_device_in_dod

[Aaron Lu]

If the firmware has declared more than 8 video output devices, and the
one that control the internal panel's backlight is listed after the
first 8 output devices, the _DOD will not include it due to the current
i915 operation region implementation. As a result, we will not create a
backlight device for it while we should. Solve this problem by special
case the firmware that has 8+ output devices in that if we see such a
firmware, we do not test if the device is in _DOD list. The creation of
the backlight device will also enable the firmware to emit events on
backlight hotkey press when the acpi_osi= cmdline option is specified on
those affected ASUS laptops.

Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=70241
Reported-and-tested-by: Oleksij Rempel <linux at rempel-privat.de>
Reported-and-tested-by: Dmitry Tunin <hanipouspilot at gmail.com>
Reported-and-tested-by: Jimbo <jaime.91 at hotmail.es>
Cc: stable at vger.kernel.org
Signed-off-by: Aaron Lu <aaron.lu at intel.com>
---
 drivers/acpi/video.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8b844931b936..c72e79d2c5ad 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -155,6 +155,7 @@ struct acpi_video_bus {
 	u8 dos_setting;
 	struct acpi_video_enumerated_device *attached_array;
 	u8 attached_count;
+	u8 child_count;
 	struct acpi_video_bus_cap cap;
 	struct acpi_video_bus_flags flags;
 	struct list_head video_device_list;
@@ -1176,8 +1177,12 @@ static bool acpi_video_device_in_dod(struct acpi_video_device *device)
 	struct acpi_video_bus *video = device->video;
 	int i;
 
-	/* If we have a broken _DOD, no need to test */
-	if (!video->attached_count)
+	/*
+	 * If we have a broken _DOD or we have more than 8 output devices
+	 * under the graphics controller node that we can't proper deal with
+	 * in the operation region code currently, no need to test.
+	 */
+	if (!video->attached_count || video->child_count > 8)
 		return true;
 
 	for (i = 0; i < video->attached_count; i++) {
@@ -1430,6 +1435,7 @@ acpi_video_bus_get_devices(struct acpi_video_bus *video,
 			dev_err(&dev->dev, "Can't attach device\n");
 			break;
 		}
+		video->child_count++;
 	}
 	return status;
 }
-- 
2.1.0