linux-kernel - Re: [PATCH v2 12/12] media: flash: use led_set_brightness

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Date:	Tue, 29 Sep 2015 09:26:27 +0200
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	sakari.ailus@...ux.intel.com, andrew@...n.ch, rpurdie@...ys.net,
	linux-media@...r.kernel.org
Subject: Re: [PATCH v2 12/12] media: flash: use led_set_brightness_sync for
 torch brightness

Hi Pavel,

Thanks for the review.

On 09/28/2015 10:37 PM, Pavel Machek wrote:
> On Mon 2015-09-28 15:07:21, Jacek Anaszewski wrote:
>> LED subsystem shifted responsibility for choosing between SYNC or ASYNC
>> way of setting brightness from drivers to the caller. Adapt the wrapper
>> to those changes.
>
> Umm. Maybe right patch, but wrong position in the queue, no?
>
> If I understand changelog correctly, LED flashes will be subtly broken
> before this patch is applied.
>
> I guess this patch should be moved sooner so everything works at each
> position in bisect...?

Moving it wouldn't improve anything. It would have to be merged with
patch 7/12 [1]. However, as you mentioned, LED flashes before this
patch will be broken only subtly, i.e. torch brightness will be set
from a work queue task and not synchronously. It would be barely
noticeable. Nonetheless, I can merge the patches in the next
version of the patch set.

[1] https://lkml.org/lkml/2015/9/28/322

> Best regards,
> 								Pavel
>
>> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
>> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
>> Cc: Pavel Machek <pavel@....cz>
>> Cc: linux-media@...r.kernel.org
>> ---
>>   drivers/media/v4l2-core/v4l2-flash-led-class.c |    8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-flash-led-class.c b/drivers/media/v4l2-core/v4l2-flash-led-class.c
>> index 5bdfb8d..5d67335 100644
>> --- a/drivers/media/v4l2-core/v4l2-flash-led-class.c
>> +++ b/drivers/media/v4l2-core/v4l2-flash-led-class.c
>> @@ -107,10 +107,10 @@ static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
>>   		if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
>>   			return;
>>
>> -		led_set_brightness(&v4l2_flash->fled_cdev->led_cdev,
>> +		led_set_brightness_sync(&v4l2_flash->fled_cdev->led_cdev,
>>   					brightness);
>>   	} else {
>> -		led_set_brightness(&v4l2_flash->iled_cdev->led_cdev,
>> +		led_set_brightness_sync(&v4l2_flash->iled_cdev->led_cdev,
>>   					brightness);
>>   	}
>>   }
>> @@ -206,11 +206,11 @@ static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
>>   	case V4L2_CID_FLASH_LED_MODE:
>>   		switch (c->val) {
>>   		case V4L2_FLASH_LED_MODE_NONE:
>> -			led_set_brightness(led_cdev, LED_OFF);
>> +			led_set_brightness_sync(led_cdev, LED_OFF);
>>   			return led_set_flash_strobe(fled_cdev, false);
>>   		case V4L2_FLASH_LED_MODE_FLASH:
>>   			/* Turn the torch LED off */
>> -			led_set_brightness(led_cdev, LED_OFF);
>> +			led_set_brightness_sync(led_cdev, LED_OFF);
>>   			if (ctrls[STROBE_SOURCE]) {
>>   				external_strobe = (ctrls[STROBE_SOURCE]->val ==
>>   					V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
>


-- 
Best Regards,
Jacek Anaszewski
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