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

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Date:   Tue, 26 Nov 2019 06:28:44 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "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 Mon, 2019-11-25 at 17:05 +0100, Hans Verkuil wrote:
> 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.

Ack.

Thanks for replying.

Alex

> 
> 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);