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

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Message-ID: <6a524aedf79ba40f3286bf0ad4c7b320b561caf1.camel@analog.com>
Date:   Mon, 25 Nov 2019 15:06:47 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "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>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>
Subject: Re: [PATCH v2] media: adv7604: extend deep color mode to ADV7611

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

> 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);