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39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
From eff15cfea957f6a9714e305cf99ebe641a343144 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Wed, 11 Oct 2023 11:12:41 +0100
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Subject: [PATCH 0663/1085] media: i2c: ov9282: Read chip ID via 2 reads
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Vision Components have made an OV9281 module which blocks reading
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back the majority of registers to comply with NDAs, and in doing
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so doesn't allow auto-increment register reading as used when
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reading the chip ID.
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Use two reads and manually combine the results.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/ov9282.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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--- a/drivers/media/i2c/ov9282.c
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+++ b/drivers/media/i2c/ov9282.c
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@@ -1078,12 +1078,16 @@ error_unlock:
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static int ov9282_detect(struct ov9282 *ov9282)
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{
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int ret;
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- u32 val;
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+ u32 val, msb;
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- ret = ov9282_read_reg(ov9282, OV9282_REG_ID, 2, &val);
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+ ret = ov9282_read_reg(ov9282, OV9282_REG_ID + 1, 1, &val);
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+ if (ret)
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+ return ret;
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+ ret = ov9282_read_reg(ov9282, OV9282_REG_ID, 1, &msb);
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if (ret)
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return ret;
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+ val |= (msb << 8);
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if (val != OV9282_ID) {
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dev_err(ov9282->dev, "chip id mismatch: %x!=%x",
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OV9282_ID, val);
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