Hi Jacopo,
On 15/03/2021 13:14, Jacopo Mondi wrote:
> During the camera module initialization the image sensor PID is read to
> verify it can correctly be identified. The current implementation is
> rather confused and uses a loop implemented with a label and a goto.
>
> Replace it with a more compact for() loop.
>
> No functional changes intended.
>
> Reviewed-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
> ---
> drivers/media/i2c/rdacm20.c | 29 +++++++++++++----------------
> 1 file changed, 13 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> index 4d9bac87cba8..e190fd2e611a 100644
> --- a/drivers/media/i2c/rdacm20.c
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -59,6 +59,8 @@
> */
> #define OV10635_PIXEL_RATE (44000000)
>
> +#define OV10635_PID_TIMEOUT 3
> +
> static const struct ov10635_reg {
> u16 reg;
> u8 val;
> @@ -452,7 +454,7 @@ static const struct v4l2_subdev_ops rdacm20_subdev_ops = {
>
> static int rdacm20_initialize(struct rdacm20_device *dev)
> {
> - unsigned int retry = 3;
> + unsigned int i;
> int ret;
>
> /* Verify communication with the MAX9271: ping to wakeup. */
> @@ -501,23 +503,18 @@ static int rdacm20_initialize(struct rdacm20_device
> *dev)
> return ret;
> usleep_range(10000, 15000);
>
> -again:
> - ret = ov10635_read16(dev, OV10635_PID);
> - if (ret < 0) {
> - if (retry--)
> - goto again;
> + for (i = 0; i < OV10635_PID_TIMEOUT; ++i) {
> + ret = ov10635_read16(dev, OV10635_PID);
> + if (ret == OV10635_VERSION)
> + break;
> + else if (ret >= 0)
> + /* Sometimes we get a successful read but a wrong id. */
Trivial/nit, I'd have written "but an incorrect ID."
But that's not worthy of any respin.
> + dev_dbg(dev->dev, "OV10635 ID mismatch (%d)\n", ret);
Thanks, this alleviates my concerns from the previous version.
>
> - dev_err(dev->dev, "OV10635 ID read failed (%d)\n",
> - ret);
> - return -ENXIO;
> + usleep_range(1000, 2000);
> }
> -
> - if (ret != OV10635_VERSION) {
> - if (retry--)
> - goto again;
> -
> - dev_err(dev->dev, "OV10635 ID mismatch (0x%04x)\n",
> - ret);
> + if (i == OV10635_PID_TIMEOUT) {
> + dev_err(dev->dev, "OV10635 ID read failed (%d)\n", ret);
> return -ENXIO;
> }
>
>
