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From: Daniel Scally <djrscally@gmail.com>
To: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Ezequiel Garcia <ezequiel@collabora.com>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	Yang Li <yang.lee@linux.alibaba.com>,
	"open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)" 
	<linux-media@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	Yong Zhi <yong.zhi@intel.com>, Bingbu Cao <bingbu.cao@intel.com>,
	Tianshu Qiu <tian.shu.qiu@intel.com>,
	Colin Ian King <colin.king@canonical.com>,
	laurent.pinchart@ideasonboard.com,
	kieran.bingham@ideasonboard.com
Subject: Re: [PATCH 06/13] media: i2c: Switch control to V4L2_CID_ANALOGUE_GAIN
Date: Fri, 23 Jul 2021 13:00:40 +0100	[thread overview]
Message-ID: <b7a32257-45ce-517f-ece1-63a27f768dc6@gmail.com> (raw)
In-Reply-To: <YPp2X71VoMV4O+io@aptenodytes>

Hi Paul

On 23/07/2021 08:57, Paul Kocialkowski wrote:
> Hi,
>
> On Thu 22 Jul 21, 21:34, Daniel Scally wrote:
>> The V4L2_CID_GAIN control for this driver configures registers that
>> the datasheet specifies as analogue gain. Switch the control's ID
>> to V4L2_CID_ANALOGUE_GAIN.
> I had some doubts about this when writing the driver because it's called
> "AEC gain" but it seems that you're right. The datasheet also defines
> 0x350a and 0x350b as digital gain (which are unused by the driver).
>
> This is:
> Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>


Thanks - yeah it took me a while to be sure too. Particularly confusing
because it's called "AEC gain" in a section headed "Manual exposure /
gain compensation"...they do like to make the datasheets clear as mud
sometimes.

>
> Cheers,
>
> Paul
>
>> Signed-off-by: Daniel Scally <djrscally@gmail.com>
>> ---
>>  drivers/media/i2c/ov8865.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c
>> index c012f5cb11ab..09558a3342dd 100644
>> --- a/drivers/media/i2c/ov8865.c
>> +++ b/drivers/media/i2c/ov8865.c
>> @@ -2137,7 +2137,7 @@ static int ov8865_exposure_configure(struct ov8865_sensor *sensor, u32 exposure)
>>  
>>  /* Gain */
>>  
>> -static int ov8865_gain_configure(struct ov8865_sensor *sensor, u32 gain)
>> +static int ov8865_analog_gain_configure(struct ov8865_sensor *sensor, u32 gain)
>>  {
>>  	int ret;
>>  
>> @@ -2447,8 +2447,8 @@ static int ov8865_s_ctrl(struct v4l2_ctrl *ctrl)
>>  		if (ret)
>>  			return ret;
>>  		break;
>> -	case V4L2_CID_GAIN:
>> -		ret = ov8865_gain_configure(sensor, ctrl->val);
>> +	case V4L2_CID_ANALOGUE_GAIN:
>> +		ret = ov8865_analog_gain_configure(sensor, ctrl->val);
>>  		if (ret)
>>  			return ret;
>>  		break;
>> @@ -2493,7 +2493,7 @@ static int ov8865_ctrls_init(struct ov8865_sensor *sensor)
>>  
>>  	/* Gain */
>>  
>> -	v4l2_ctrl_new_std(handler, ops, V4L2_CID_GAIN, 128, 8191, 128, 128);
>> +	v4l2_ctrl_new_std(handler, ops, V4L2_CID_ANALOGUE_GAIN, 128, 8191, 128, 128);
>>  
>>  	/* White Balance */
>>  
>> -- 
>> 2.25.1
>>

  reply	other threads:[~2021-07-23 12:00 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 20:33 [PATCH 00/13] Extensions to ov8865 driver Daniel Scally
2021-07-22 20:33 ` [PATCH 01/13] media: i2c: Add ACPI support to ov8865 Daniel Scally
     [not found]   ` <CAHp75VfC1QMu=BcMZP8-vX_2paDp4CXqEYEDQnN+7=s3Up9VjA@mail.gmail.com>
2021-07-22 23:09     ` Daniel Scally
2021-07-22 20:33 ` [PATCH 02/13] media: i2c: Fix incorrect value in comment Daniel Scally
2021-07-23  7:44   ` Paul Kocialkowski
2021-07-23  9:17     ` Daniel Scally
2021-07-22 20:33 ` [PATCH 03/13] media: i2c: Defer probe if not endpoint found Daniel Scally
2021-07-23  7:49   ` Paul Kocialkowski
2021-07-23  9:15     ` Daniel Scally
2021-07-22 20:33 ` [PATCH 04/13] media: i2c: Support 19.2MHz input clock in ov8865 Daniel Scally
2021-07-22 20:33 ` [PATCH 05/13] media: i2c: Add .get_selection() support to ov8865 Daniel Scally
2021-07-23  8:13   ` kernel test robot
2021-07-22 20:34 ` [PATCH 06/13] media: i2c: Switch control to V4L2_CID_ANALOGUE_GAIN Daniel Scally
2021-07-23  7:57   ` Paul Kocialkowski
2021-07-23 12:00     ` Daniel Scally [this message]
2021-07-22 20:34 ` [PATCH 07/13] media: i2c: Add vblank control to ov8865 Daniel Scally
2021-07-22 20:34 ` [PATCH 08/13] media: i2c: Add hblank " Daniel Scally
2021-07-22 20:34 ` [PATCH 09/13] media: i2c: cap exposure at height + vblank in ov8865 Daniel Scally
2021-07-22 20:34 ` [PATCH 10/13] media: i2c: Add controls from fwnode to ov8865 Daniel Scally
2021-07-22 20:34 ` [PATCH 11/13] media: i2c: Switch exposure control unit to lines Daniel Scally
2021-07-22 20:34 ` [PATCH 12/13] media: i2c: Remove unused macros from ov8865 Daniel Scally
     [not found]   ` <CAHp75Vcmo8rD=WpECbKfpByBr1pAL+7gV2eycZ=3M+YDWUzOFw@mail.gmail.com>
2021-07-23  8:00     ` Paul Kocialkowski
2021-07-23  9:07       ` Daniel Scally
2021-07-22 20:34 ` [PATCH 13/13] media: ipu3-cio2: Add INT347A to cio2-bridge Daniel Scally
     [not found]   ` <CAHp75Vc60J1kTs0Kv5ibc+5zqCTvRDDAcmHFKFDi-4Qd-rBHuA@mail.gmail.com>
2021-07-22 23:07     ` Daniel Scally

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