[PATCH 2/4] media: ipu-bridge: Add the ST VD55G1 (TBE20A1)

[Ruslan Koreev]

Add the ACPI HID Lenovo uses for the ST VD55G1 IR camera of the ThinkPad
X1 Carbon Gen 14. The firmware describes one CSI-2 data lane and, as
usual, no link frequency, so the value has to come from this table; the
vd55g1 driver requires exactly one.

Use 402 MHz (804 Mbps). The sensor derives its MIPI rate and clock tree
from this value and the IPU7 CSI-2 receiver reads the same value back
through V4L2_CID_LINK_FREQ, so both ends agree by construction. At
804 Mbps a full-width 10-bit line takes about 11 us on the link, which
allows well over 100 fps at full resolution; lower rates lengthen every
line proportionally. The rate is in the lower half of the 250 to
1200 Mbps range the sensor supports and is the one validated on the
hardware, where 804x704 streams at 58 fps.

Signed-off-by: Ruslan Koreev <koreev.r@xxxxxxxxx>
---
 drivers/media/pci/intel/ipu-bridge.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/pci/intel/ipu-bridge.c b/drivers/media/pci/intel/ipu-bridge.c
index bd64c0400..5941428ed 100644
--- a/drivers/media/pci/intel/ipu-bridge.c
+++ b/drivers/media/pci/intel/ipu-bridge.c
@@ -101,6 +101,8 @@ static const struct ipu_sensor_config ipu_supported_sensors[] = {
 	IPU_SENSOR_CONFIG("SONY471A", 1, 200000000),
 	/* Sony IMX471 (found on Lenovo X1 Carbon G14) */
 	IPU_SENSOR_CONFIG("TBE20A0", 1, 200000000),
+	/* STMicroelectronics VD55G1 (found on Lenovo X1 Carbon G14) */
+	IPU_SENSOR_CONFIG("TBE20A1", 1, 402000000),
 	/* Toshiba T4KA3 */
 	IPU_SENSOR_CONFIG("XMCC0003", 1, 321468000),
 };
-- 
2.55.0