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43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
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From 5c6b7b60d7d607b59b4208e758180d4f93be8788 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Mon, 6 Jul 2020 17:51:32 +0100
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Subject: [PATCH] media: i2c: ov9281: 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/ov9281.c | 14 +++++++++-----
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1 file changed, 9 insertions(+), 5 deletions(-)
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--- a/drivers/media/i2c/ov9281.c
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+++ b/drivers/media/i2c/ov9281.c
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@@ -904,13 +904,17 @@ static int ov9281_check_sensor_id(struct
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struct i2c_client *client)
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{
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struct device *dev = &ov9281->client->dev;
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- u32 id = 0;
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+ u32 id = 0, id_msb;
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int ret;
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- ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID,
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- OV9281_REG_VALUE_16BIT, &id);
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- if (id != CHIP_ID) {
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- dev_err(dev, "Unexpected sensor id(%06x), ret(%d)\n", id, ret);
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+ ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID + 1,
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+ OV9281_REG_VALUE_08BIT, &id);
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+ if (!ret)
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+ ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID,
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+ OV9281_REG_VALUE_08BIT, &id_msb);
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+ id |= (id_msb << 8);
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+ if (ret || id != CHIP_ID) {
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+ dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n", id, ret);
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return -ENODEV;
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}
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