linux-kernel - Re: [PATCH v3 19/20] media: i2c: ov4689: Refactor ov4689_s

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Message-ID: <87wmqhfz0f.fsf@gmail.com>
Date: Tue, 05 Mar 2024 00:48:14 +0300
From: Mikhail Rudenko <mike.rudenko@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, Sakari Ailus
 <sakari.ailus@...ux.intel.com>, Jacopo Mondi <jacopo@...ndi.org>, Tommaso
 Merciai <tomm.merciai@...il.com>, Christophe JAILLET
 <christophe.jaillet@...adoo.fr>, Dave Stevenson
 <dave.stevenson@...pberrypi.com>, Mauro Carvalho Chehab
 <mchehab@...nel.org>
Subject: Re: [PATCH v3 19/20] media: i2c: ov4689: Refactor ov4689_s_stream


Hi Laurent,

and thanks for the review.

On 2024-03-04 at 23:31 +02, Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:

> Hi Mikhail,
>
> Thank you for the patch.
>
> On Thu, Feb 29, 2024 at 07:53:32PM +0300, Mikhail Rudenko wrote:
>> Split ov4689_s_stream into __ov4689_stream_on and __ov4689_stream_off
>> functions. Also remove repetitive pm_runtime_put calls and call
>> pm_runtime_put once at the end of the __ov4689_stream_off function if
>> any error occurred.
>>
>> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
>> ---
>>  drivers/media/i2c/ov4689.c | 100 ++++++++++++++++++++-----------------
>>  1 file changed, 53 insertions(+), 47 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
>> index 2496067b90a0..5cea9b5ba201 100644
>> --- a/drivers/media/i2c/ov4689.c
>> +++ b/drivers/media/i2c/ov4689.c
>> @@ -537,61 +537,67 @@ static int ov4689_setup_blc_anchors(struct ov4689 *ov4689,
>>  	return ret;
>>  }
>>
>> +static int __ov4689_stream_on(struct ov4689 *ov4689,
>
> No need for the __ prefix. Same for __ov4689_stream_off().

Will remove the prefix in v4.

>> +			      struct v4l2_subdev_state *sd_state)
>> +{
>> +	int ret;
>> +
>> +	ret = pm_runtime_resume_and_get(ov4689->dev);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = cci_multi_reg_write(ov4689->regmap, ov4689_common_regs,
>> +				  ARRAY_SIZE(ov4689_common_regs), NULL);
>> +	if (ret)
>> +		goto cleanup_pm;
>> +
>> +	ret = ov4689_setup_timings(ov4689, sd_state);
>> +	if (ret)
>> +		goto cleanup_pm;
>> +
>> +	ret = ov4689_setup_blc_anchors(ov4689, sd_state);
>> +	if (ret)
>> +		goto cleanup_pm;
>> +
>> +	ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
>> +	if (ret)
>> +		goto cleanup_pm;
>> +
>> +	ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
>> +			OV4689_MODE_STREAMING, NULL);
>> +	if (ret)
>> +		goto cleanup_pm;
>> +
>> +	return 0;
>> +
>> + cleanup_pm:
>
> No space before the label. I would also name it just "error".

Thanks for the suggestion, will do so in v4.

> With those small changes,
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
>> +	pm_runtime_put(ov4689->dev);
>> +	return ret;
>> +}
>> +
>> +static int __ov4689_stream_off(struct ov4689 *ov4689)
>> +{
>> +	cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE, OV4689_MODE_SW_STANDBY,
>> +		  NULL);
>> +	pm_runtime_mark_last_busy(ov4689->dev);
>> +	pm_runtime_put_autosuspend(ov4689->dev);
>> +
>> +	return 0;
>> +}
>> +
>>  static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
>>  {
>>  	struct ov4689 *ov4689 = to_ov4689(sd);
>>  	struct v4l2_subdev_state *sd_state;
>> -	struct device *dev = ov4689->dev;
>> -	int ret = 0;
>> +	int ret;
>>
>>  	sd_state = v4l2_subdev_lock_and_get_active_state(&ov4689->subdev);
>>
>> -	if (on) {
>> -		ret = pm_runtime_resume_and_get(dev);
>> -		if (ret < 0)
>> -			goto unlock_and_return;
>> -
>> -		ret = cci_multi_reg_write(ov4689->regmap,
>> -					  ov4689_common_regs,
>> -					  ARRAY_SIZE(ov4689_common_regs),
>> -					  NULL);
>> -		if (ret) {
>> -			pm_runtime_put(dev);
>> -			goto unlock_and_return;
>> -		}
>> -
>> -		ret = ov4689_setup_timings(ov4689, sd_state);
>> -		if (ret) {
>> -			pm_runtime_put(dev);
>> -			goto unlock_and_return;
>> -		}
>> -
>> -		ret = ov4689_setup_blc_anchors(ov4689, sd_state);
>> -		if (ret) {
>> -			pm_runtime_put(dev);
>> -			goto unlock_and_return;
>> -		}
>> -
>> -		ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
>> -		if (ret) {
>> -			pm_runtime_put(dev);
>> -			goto unlock_and_return;
>> -		}
>> -
>> -		ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
>> -				OV4689_MODE_STREAMING, NULL);
>> -		if (ret) {
>> -			pm_runtime_put(dev);
>> -			goto unlock_and_return;
>> -		}
>> -	} else {
>> -		cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
>> -			  OV4689_MODE_SW_STANDBY, NULL);
>> -		pm_runtime_mark_last_busy(dev);
>> -		pm_runtime_put_autosuspend(dev);
>> -	}
>> +	if (on)
>> +		ret = __ov4689_stream_on(ov4689, sd_state);
>> +	else
>> +		ret = __ov4689_stream_off(ov4689);
>>
>> -unlock_and_return:
>>  	v4l2_subdev_unlock_state(sd_state);
>>
>>  	return ret;


--
Best regards,
Mikhail Rudenko