media: i2c: ov9282: Read chip ID via 2 reads

Vision Components have made an OV9281 module which blocks reading back the majority of registers to comply with NDAs, and in doing so doesn't allow auto-increment register reading as used when reading the chip ID. Use two reads and manually combine the results. Signed-off-by: Dave Stevenson <[email protected]>
raspberrypi · Oct 11, 2023 · 57b2721 · 57b2721
1 parent b9d35ab
commit 57b2721
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
@@ -1078,12 +1078,16 @@ static int ov9282_set_stream(struct v4l2_subdev *sd, int enable)
 static int ov9282_detect(struct ov9282 *ov9282)
 {
 	int ret;
-	u32 val;
+	u32 val, msb;
 
-	ret = ov9282_read_reg(ov9282, OV9282_REG_ID, 2, &val);
+	ret = ov9282_read_reg(ov9282, OV9282_REG_ID + 1, 1, &val);
+	if (ret)
+		return ret;
+	ret = ov9282_read_reg(ov9282, OV9282_REG_ID, 1, &msb);
 	if (ret)
 		return ret;
 
+	val |= (msb << 8);
 	if (val != OV9282_ID) {
 		dev_err(ov9282->dev, "chip id mismatch: %x!=%x",
 			OV9282_ID, val);