linux-kernel - Re: [PATCH v2] media: adv7604: extend deep color mode to ADV7611

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Date:   Mon, 25 Nov 2019 17:05:05 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "mchehab@...nel.org" <mchehab@...nel.org>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>
Subject: Re: [PATCH v2] media: adv7604: extend deep color mode to ADV7611

On 11/25/19 4:06 PM, Ardelean, Alexandru wrote:
> On Fri, 2019-10-18 at 14:29 +0300, Alexandru Ardelean wrote:
>> From: Dragos Bogdan <dragos.bogdan@...log.com>
>>
>> The AD7611 chip supports the same Deep Color Mode settings as the AD7604.
>> This change extends support for this feature to the AD7611 by adding a
>> wrapper function for the `read_hdmi_pixelclock` hook and adding the same
>> frequency adjustment logic.
>>
> 
> ping here

Not forgotten, it's on my TODO list. But I need some time to dig a bit
deeper into this code.

Regards,

	Hans

> 
>> Signed-off-by: Dragos Bogdan <dragos.bogdan@...log.com>
>> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
>> ---
>>
>> Changelog v1 -> v2:
>> * address checkpatch complaints about 80 col limit and
>>   use of `unsigned` vs `unsigned int`
>>
>>  drivers/media/i2c/adv7604.c | 32 +++++++++++++++++++++-----------
>>  1 file changed, 21 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
>> index 28a84bf9f8a9..c6fe3aa69733 100644
>> --- a/drivers/media/i2c/adv7604.c
>> +++ b/drivers/media/i2c/adv7604.c
>> @@ -1503,23 +1503,14 @@ static void
>> adv76xx_fill_optional_dv_timings_fields(struct v4l2_subdev *sd,
>>  
>>  static unsigned int adv7604_read_hdmi_pixelclock(struct v4l2_subdev *sd)
>>  {
>> -	unsigned int freq;
>>  	int a, b;
>>  
>>  	a = hdmi_read(sd, 0x06);
>>  	b = hdmi_read(sd, 0x3b);
>>  	if (a < 0 || b < 0)
>>  		return 0;
>> -	freq =  a * 1000000 + ((b & 0x30) >> 4) * 250000;
>>  
>> -	if (is_hdmi(sd)) {
>> -		/* adjust for deep color mode */
>> -		unsigned bits_per_channel = ((hdmi_read(sd, 0x0b) & 0x60)
>>>> 4) + 8;
>> -
>> -		freq = freq * 8 / bits_per_channel;
>> -	}
>> -
>> -	return freq;
>> +	return a * 1000000 + ((b & 0x30) >> 4) * 250000;
>>  }
>>  
>>  static unsigned int adv7611_read_hdmi_pixelclock(struct v4l2_subdev *sd)
>> @@ -1530,9 +1521,28 @@ static unsigned int
>> adv7611_read_hdmi_pixelclock(struct v4l2_subdev *sd)
>>  	b = hdmi_read(sd, 0x52);
>>  	if (a < 0 || b < 0)
>>  		return 0;
>> +
>>  	return ((a << 1) | (b >> 7)) * 1000000 + (b & 0x7f) * 1000000 /
>> 128;
>>  }
>>  
>> +static unsigned int adv76xx_read_hdmi_pixelclock(struct v4l2_subdev *sd)
>> +{
>> +	struct adv76xx_state *state = to_state(sd);
>> +	const struct adv76xx_chip_info *info = state->info;
>> +	unsigned int freq, bits_per_channel, pixelrepetition;
>> +
>> +	freq = info->read_hdmi_pixelclock(sd);
>> +	if (is_hdmi(sd)) {
>> +		/* adjust for deep color mode and pixel repetition */
>> +		bits_per_channel = ((hdmi_read(sd, 0x0b) & 0x60) >> 4) + 8;
>> +		pixelrepetition = (hdmi_read(sd, 0x05) & 0x0f) + 1;
>> +
>> +		freq = freq * 8 / bits_per_channel / pixelrepetition;
>> +	}
>> +
>> +	return freq;
>> +}
>> +
>>  static int adv76xx_query_dv_timings(struct v4l2_subdev *sd,
>>  			struct v4l2_dv_timings *timings)
>>  {
>> @@ -1579,7 +1589,7 @@ static int adv76xx_query_dv_timings(struct
>> v4l2_subdev *sd,
>>  
>>  		bt->width = w;
>>  		bt->height = h;
>> -		bt->pixelclock = info->read_hdmi_pixelclock(sd);
>> +		bt->pixelclock = adv76xx_read_hdmi_pixelclock(sd);
>>  		bt->hfrontporch = hdmi_read16(sd, 0x20, info-
>>> hfrontporch_mask);
>>  		bt->hsync = hdmi_read16(sd, 0x22, info->hsync_mask);
>>  		bt->hbackporch = hdmi_read16(sd, 0x24, info-
>>> hbackporch_mask);