[PATCH 7/7] media: ipu-bridge: Add a 90 degree rotation quirk for Surface Book 2

[Antoine Pichot <antoine.pichot@gmail.com>]

The infrared camera of the Microsoft Surface Book 2, an OmniVision
OV7251 with ACPI ID INT347E, is mounted rotated by 90 degrees. An
upright scene appears rotated 90 degrees clockwise in its frames, with
the top of the scene at the right edge of the image, while a frame
taken at the same moment by the colour camera next to it shows the
scene upright. The degree field of the sensor's SSDB buffer in the ACPI
tables is 0, and so is the rotation field of its _PLD, so
ipu_bridge_parse_rotation() sets the rotation property to 0 and
userspace has no way to know that the image needs correcting.

The firmware is wrong here, and ipu-bridge is where the firmware data
is turned into the rotation property: it already carries DMI (Desktop
Management Interface) quirks for sensors mounted upside down without
the firmware saying so. Add a second table for sensors rotated by 90
degrees, checked the same way, with one entry for the Surface Book 2
infrared sensor. Following V4L2_CID_CAMERA_SENSOR_ROTATION, 90 is the
counter-clockwise rotation to apply to correct the image. The entry
matches on the SKU of the 13 inch model, the one checked; the 15 inch
model has its own SKU and has not been checked. The colour sensors of
this machine (INT33BE and INT347A) already report 180 degrees and are
unchanged.

Tested on a 13 inch Surface Book 2 (SKU Surface_Book_1832) with a
7.2.12 kernel: V4L2_CID_CAMERA_SENSOR_ROTATION on the OV7251 reads 90
instead of 0, the colour sensors still read 180 and the orientation
controls are unchanged.

Signed-off-by: Antoine Pichot <antoine.pichot@gmail.com>
---
 drivers/media/pci/intel/ipu-bridge.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/media/pci/intel/ipu-bridge.c b/drivers/media/pci/intel/ipu-bridge.c
index 3739c4a2a8..51ed4283ce 100644
--- a/drivers/media/pci/intel/ipu-bridge.c
+++ b/drivers/media/pci/intel/ipu-bridge.c
@@ -281,6 +281,23 @@ static const struct dmi_system_id upside_down_sensor_dmi_ids[] = {
 	{} /* Terminating entry */
 };
 
+/*
+ * DMI matches for laptops which have their sensor mounted rotated by 90 degrees
+ * without reporting it in the SSDB.
+ */
+static const struct dmi_system_id rotated_90_sensor_dmi_ids[] = {
+	{
+		/* Microsoft Surface Book 2 13 inch, infrared sensor */
+		.matches = {
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR,
+					"Microsoft Corporation"),
+			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Book_1832"),
+		},
+		.driver_data = "INT347E",
+	},
+	{} /* Terminating entry */
+};
+
 static const struct ipu_property_names prop_names = {
 	.clock_frequency = "clock-frequency",
 	.rotation = "rotation",
@@ -474,6 +491,11 @@ static u32 ipu_bridge_parse_rotation(struct acpi_device *adev,
 		if (acpi_dev_hid_match(adev, dmi_id->driver_data))
 			return 180;
 
+	for (dmi_id = dmi_first_match(rotated_90_sensor_dmi_ids); dmi_id;
+	     dmi_id = dmi_first_match(dmi_id + 1))
+		if (acpi_dev_hid_match(adev, dmi_id->driver_data))
+			return 90;
+
 	switch (ssdb->degree) {
 	case IPU_SENSOR_ROTATION_NORMAL:
 		return 0;
-- 
2.56.0