linux-kernel - Re: [PATCH 2/3] gspca_zc3xx: Fix power line frequency settings for OV7648

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Date:   Fri, 25 May 2018 10:13:08 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Ondrej Zary <linux@...nbow-software.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] gspca_zc3xx: Fix power line frequency settings for
 OV7648

On 24/05/18 17:09, Ondrej Zary wrote:
> Power line frequency settings for OV7648 sensor contain autogain
> and exposure commands, affecting unrelated controls. Remove them.
> 
> Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
> ---
>  drivers/media/usb/gspca/zc3xx.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/usb/gspca/zc3xx.c b/drivers/media/usb/gspca/zc3xx.c
> index 992918b3ad0c..9a78420e8ad8 100644
> --- a/drivers/media/usb/gspca/zc3xx.c
> +++ b/drivers/media/usb/gspca/zc3xx.c
> @@ -3184,7 +3184,8 @@ static const struct usb_action ov7620_InitialScale[] = {	/* 320x240 */
>  	{}
>  };
>  static const struct usb_action ov7620_50HZ[] = {
> -	{0xaa, 0x13, 0x00a3},	/* 00,13,a3,aa */
> +/*	{0xaa, 0x13, 0x00a3},	 * 00,13,a3,aa
> +				 * don't change autoexposure */
>  	{0xdd, 0x00, 0x0100},	/* 00,01,00,dd */
>  	{0xaa, 0x2b, 0x0096},	/* 00,2b,96,aa */
>  	{0xaa, 0x75, 0x008a},	/* 00,75,8a,aa */

Just remove these lines altogether. There are still present in the git history
if they are ever needed again. Same for the next patch.

Regards,

	Hans

> @@ -3195,15 +3196,16 @@ static const struct usb_action ov7620_50HZ[] = {
>  	{0xa0, 0x00, ZC3XX_R195_ANTIFLICKERHIGH},	/* 01,95,00,cc */
>  	{0xa0, 0x00, ZC3XX_R196_ANTIFLICKERMID},	/* 01,96,00,cc */
>  	{0xa0, 0x83, ZC3XX_R197_ANTIFLICKERLOW},	/* 01,97,83,cc */
> -	{0xaa, 0x10, 0x0082},				/* 00,10,82,aa */
> +/*	{0xaa, 0x10, 0x0082},	 * 00,10,82,aa
> +				 * don't change exposure */
>  	{0xaa, 0x76, 0x0003},				/* 00,76,03,aa */
>  /*	{0xa0, 0x40, ZC3XX_R002_CLOCKSELECT},		 * 00,02,40,cc
>  							 * if mode0 (640x480) */
>  	{}
>  };
>  static const struct usb_action ov7620_60HZ[] = {
> -	{0xaa, 0x13, 0x00a3},			/* 00,13,a3,aa */
> -						/* (bug in zs211.inf) */
> +/*	{0xaa, 0x13, 0x00a3},	 * 00,13,a3,aa
> +				 * don't change autoexposure */
>  	{0xdd, 0x00, 0x0100},			/* 00,01,00,dd */
>  	{0xaa, 0x2b, 0x0000},			/* 00,2b,00,aa */
>  	{0xaa, 0x75, 0x008a},			/* 00,75,8a,aa */
> @@ -3214,7 +3216,8 @@ static const struct usb_action ov7620_60HZ[] = {
>  	{0xa0, 0x00, ZC3XX_R195_ANTIFLICKERHIGH}, /* 01,95,00,cc */
>  	{0xa0, 0x00, ZC3XX_R196_ANTIFLICKERMID}, /* 01,96,00,cc */
>  	{0xa0, 0x83, ZC3XX_R197_ANTIFLICKERLOW}, /* 01,97,83,cc */
> -	{0xaa, 0x10, 0x0020},			/* 00,10,20,aa */
> +/*	{0xaa, 0x10, 0x0020},	 * 00,10,20,aa
> +				 * don't change exposure */
>  	{0xaa, 0x76, 0x0003},			/* 00,76,03,aa */
>  /*	{0xa0, 0x40, ZC3XX_R002_CLOCKSELECT},	 * 00,02,40,cc
>  						 * if mode0 (640x480) */
> @@ -3224,8 +3227,8 @@ static const struct usb_action ov7620_60HZ[] = {
>  	{}
>  };
>  static const struct usb_action ov7620_NoFliker[] = {
> -	{0xaa, 0x13, 0x00a3},			/* 00,13,a3,aa */
> -						/* (bug in zs211.inf) */
> +/*	{0xaa, 0x13, 0x00a3},	 * 00,13,a3,aa
> +				 * don't change autoexposure */
>  	{0xdd, 0x00, 0x0100},			/* 00,01,00,dd */
>  	{0xaa, 0x2b, 0x0000},			/* 00,2b,00,aa */
>  	{0xaa, 0x75, 0x008e},			/* 00,75,8e,aa */
>