The ov2659 driver performs device detection and initialization in the
following way:
- send reset command REG_SOFTWARE_RESET
- load array of predefined register's setting (~150 values)
- read device version REG_SC_CHIP_ID_H/REG_SC_CHIP_ID_L
- check version and exit if invalid.
As result, for not connected device there will be >~150 i2c transactions
executed before device version checking and exit (there are no
failures detected because ov2659 declared as I2C_CLIENT_SCCB and NACKs
are ignored in this case).
Let's fix that by checking the chip version first and start
initialization only if it's supported.
Cc: Benoit Parrot <bparrot@xxxxxx>
Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
---
drivers/media/i2c/ov2659.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/media/i2c/ov2659.c b/drivers/media/i2c/ov2659.c
index 49109f4..9b7b78c 100644
--- a/drivers/media/i2c/ov2659.c
+++ b/drivers/media/i2c/ov2659.c
@@ -1321,10 +1321,6 @@ static int ov2659_detect(struct v4l2_subdev *sd)
}
usleep_range(1000, 2000);
- ret = ov2659_init(sd, 0);
- if (ret < 0)
- return ret;
-
/* Check sensor revision */
ret = ov2659_read(client, REG_SC_CHIP_ID_H, &pid);
if (!ret)
@@ -1338,8 +1334,10 @@ static int ov2659_detect(struct v4l2_subdev *sd)
dev_err(&client->dev,
"Sensor detection failed (%04X, %d)\n",
id, ret);
- else
+ else {
dev_info(&client->dev, "Found OV%04X sensor\n", id);
+ ret = ov2659_init(sd, 0);
+ }
}
return ret;
--
2.6.4
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