linux-kernel - Re: [RFC 1/3] saa7115: Set saa7113 init to values from datasheet

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Date:	Wed, 29 May 2013 22:19:49 -0400
From:	Andy Walls <awalls@...metrocast.net>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Jon Arne Jørgensen <jonarne@...arne.no>
CC:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	hans.verkuil@...co.com, prabhakar.csengg@...il.com,
	g.liakhovetski@....de, ezequiel.garcia@...e-electrons.com,
	timo.teras@....fi
Subject: Re: [RFC 1/3] saa7115: Set saa7113 init to values from datasheet

Mauro Carvalho Chehab <mchehab@...hat.com> wrote:

>Em Wed, 29 May 2013 22:41:16 +0200
>Jon Arne Jørgensen <jonarne@...arne.no> escreveu:
>
>> Change all default values in the initial setup table to match the
>table
>> in the datasheet.
>
>This is not a good idea, as it can produce undesired side effects
>on the existing drivers that depend on it, and can't be easily
>tested.
>
>Please, don't change the current "default". It is, of course, OK
>to change them if needed via the information provided inside the
>platform data.
>
>Regards,
>Mauro
>> 
>> Signed-off-by: Jon Arne Jørgensen <jonarne@...arne.no>
>> ---
>>  drivers/media/i2c/saa7115.c | 12 ++++++------
>>  1 file changed, 6 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/media/i2c/saa7115.c
>b/drivers/media/i2c/saa7115.c
>> index d6f589a..4403679 100644
>> --- a/drivers/media/i2c/saa7115.c
>> +++ b/drivers/media/i2c/saa7115.c
>> @@ -223,12 +223,12 @@ static const unsigned char saa7111_init[] = {
>>  static const unsigned char saa7113_init[] = {
>>  	R_01_INC_DELAY, 0x08,
>>  	R_02_INPUT_CNTL_1, 0xc2,
>> -	R_03_INPUT_CNTL_2, 0x30,
>> +	R_03_INPUT_CNTL_2, 0x33,
>>  	R_04_INPUT_CNTL_3, 0x00,
>>  	R_05_INPUT_CNTL_4, 0x00,
>> -	R_06_H_SYNC_START, 0x89,
>> +	R_06_H_SYNC_START, 0xe9,
>>  	R_07_H_SYNC_STOP, 0x0d,
>> -	R_08_SYNC_CNTL, 0x88,
>> +	R_08_SYNC_CNTL, 0x98,
>>  	R_09_LUMA_CNTL, 0x01,
>>  	R_0A_LUMA_BRIGHT_CNTL, 0x80,
>>  	R_0B_LUMA_CONTRAST_CNTL, 0x47,
>> @@ -236,11 +236,11 @@ static const unsigned char saa7113_init[] = {
>>  	R_0D_CHROMA_HUE_CNTL, 0x00,
>>  	R_0E_CHROMA_CNTL_1, 0x01,
>>  	R_0F_CHROMA_GAIN_CNTL, 0x2a,
>> -	R_10_CHROMA_CNTL_2, 0x08,
>> +	R_10_CHROMA_CNTL_2, 0x00,
>>  	R_11_MODE_DELAY_CNTL, 0x0c,
>> -	R_12_RT_SIGNAL_CNTL, 0x07,
>> +	R_12_RT_SIGNAL_CNTL, 0x01,
>>  	R_13_RT_X_PORT_OUT_CNTL, 0x00,
>> -	R_14_ANAL_ADC_COMPAT_CNTL, 0x00,
>> +	R_14_ANAL_ADC_COMPAT_CNTL, 0x00,	/* RESERVED */
>>  	R_15_VGATE_START_FID_CHG, 0x00,
>>  	R_16_VGATE_STOP, 0x00,
>>  	R_17_MISC_VGATE_CONF_AND_MSB, 0x00,
>
>
>-- 
>
>Cheers,
>Mauro
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I was going to make a comment along the same line as Mauro.  
Please leave the driver defaults alone.  It is almost impossible to regression test all the different devices with a SAA7113 chip, to ensure the change doesn't cause someone's device to not work properly.

Regards,
Andy

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