Re: [PATCH v2 1/2] media: i2c: imx290: Check for availability in probe()
From: Sakari Ailus
Date: Thu Aug 29 2024 - 08:50:09 EST
Hi Benjamin,
On Wed, Aug 28, 2024 at 08:13:07PM +0200, Benjamin Bara wrote:
> Currently, the V4L2 subdevice is also created when the device is not
> available/connected. In this case, dmesg shows the following:
>
> [ 10.419510] imx290 7-001a: Error writing reg 0x301c: -6
> [ 10.428981] imx290 7-001a: Error writing reg 0x3020: -6
> [ 10.442712] imx290 7-001a: Error writing reg 0x3018: -6
> [ 10.454018] imx290 7-001a: Error writing reg 0x3020: -6
>
> which seems to come from imx290_ctrl_update() after the subdev init is
> finished. However, as the errors are ignored, the subdev is initialized
> but simply does not work. From userspace perspective, there is no
> visible difference between a working and not-working subdevice (except
> when trying it out or watching for the error message).
>
> This commit adds a simple availability check before starting with the
> subdev initialization to error out instead.
>
> Signed-off-by: Benjamin Bara <benjamin.bara@xxxxxxxxxxx>
> ---
> Changes since v1:
> - define operating/standby mode and use it
> - read out the standby mode during probe and ensure it is standby
> ---
> drivers/media/i2c/imx290.c | 17 +++++++++++++++--
> 1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> index 4150e6e4b9a6..2a869576600c 100644
> --- a/drivers/media/i2c/imx290.c
> +++ b/drivers/media/i2c/imx290.c
> @@ -29,6 +29,8 @@
> #include <media/v4l2-subdev.h>
>
> #define IMX290_STANDBY CCI_REG8(0x3000)
> +#define IMX290_STANDBY_OPERATING (0 << 0)
> +#define IMX290_STANDBY_STANDBY (1 << 0)
This should use BIT() instead (or at least unsigned values). I'll fix that
while at it, too...
--
Kind regards,
Sakari Ailus