Re: [PATCH v2 2/3] [media] mt9v032: Do not unset master_mode

[Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>]

Hi Markus,

Thank you for the patch.

On Monday 14 December 2015 15:41:52 Markus Pargmann wrote:
> The power_on function of the driver resets the chip and sets the
> CHIP_CONTROL register to 0. This switches the operating mode to slave.
> The s_stream function sets the correct mode. But this caused problems on
> a board where the camera chip is operated as master. The camera started
> after a random amount of time streaming an image, I observed between 10
> and 300 seconds.
> 
> The STRFM_OUT and STLN_OUT pins are not connected on this board which
> may cause some issues in slave mode. I could not find any documentation
> about this.
> 
> Keeping the chip in master mode after the reset helped to fix this
> issue for me.
> 
> Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>

Acked-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>

and applied to my tree.

> ---
>  drivers/media/i2c/mt9v032.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c
> index c1bc564a0979..cc16acf001de 100644
> --- a/drivers/media/i2c/mt9v032.c
> +++ b/drivers/media/i2c/mt9v032.c
> @@ -349,7 +349,8 @@ static int mt9v032_power_on(struct mt9v032 *mt9v032)
>  	if (ret < 0)
>  		return ret;
> 
> -	return regmap_write(map, MT9V032_CHIP_CONTROL, 0);
> +	return regmap_write(map, MT9V032_CHIP_CONTROL,
> +			    MT9V032_CHIP_CONTROL_MASTER_MODE);
>  }
> 
>  static void mt9v032_power_off(struct mt9v032 *mt9v032)
> @@ -421,8 +422,7 @@ __mt9v032_get_pad_crop(struct mt9v032 *mt9v032, struct
> v4l2_subdev_pad_config *c
> 
>  static int mt9v032_s_stream(struct v4l2_subdev *subdev, int enable)
>  {
> -	const u16 mode = MT9V032_CHIP_CONTROL_MASTER_MODE
> -		       | MT9V032_CHIP_CONTROL_DOUT_ENABLE
> +	const u16 mode = MT9V032_CHIP_CONTROL_DOUT_ENABLE
> 
>  		       | MT9V032_CHIP_CONTROL_SEQUENTIAL;
> 
>  	struct mt9v032 *mt9v032 = to_mt9v032(subdev);
>  	struct v4l2_rect *crop = &mt9v032->crop;

-- 
Regards,

Laurent Pinchart

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