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

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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 <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2023-10-11 11:12:41 +01:00
committed by Dom Cobley
parent 1e09fc031c
commit 1f89a855fa
1 changed files with 6 additions and 2 deletions
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8
drivers/media/i2c/ov9282.c
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@@ -1069,12 +1069,16 @@ error_unlock:
static int ov9282_detect(struct ov9282 *ov9282) static int ov9282_detect(struct ov9282 *ov9282)
{ {
int ret; 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) if (ret)
return ret; return ret;
val |= (msb << 8);
if (val != OV9282_ID) { if (val != OV9282_ID) {
dev_err(ov9282->dev, "chip id mismatch: %x!=%x", dev_err(ov9282->dev, "chip id mismatch: %x!=%x",
OV9282_ID, val); OV9282_ID, val);