linux-kernel - Re: [PATCH v3 02/14] media: ov7670: split register setting from set

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Date:   Tue, 15 Jan 2019 10:45:05 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-media@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        James Cameron <quozl@...top.org>, Pavel Machek <pavel@....cz>,
        Libin Yang <lbyang@...vell.com>,
        Albert Wang <twang13@...vell.com>
Subject: Re: [PATCH v3 02/14] media: ov7670: split register setting from
 set_framerate() logic

On Tue, Jan 15, 2019 at 09:30:31AM +0100, Lubomir Rintel wrote:
> On Tue, 2019-01-15 at 01:03 +0200, Sakari Ailus wrote:
> > On Tue, Nov 20, 2018 at 11:03:07AM +0100, Lubomir Rintel wrote:
> > > This will allow us to restore the last set frame rate after the device
> > > returns from a power off.
> > > 
> > > Signed-off-by: Lubomir Rintel <lkundrak@...sk>
> > > 
> > > ---
> > > Changes since v2:
> > > - This patch was added to the series
> > > 
> > >  drivers/media/i2c/ov7670.c | 30 ++++++++++++++----------------
> > >  1 file changed, 14 insertions(+), 16 deletions(-)
> > > 
> > > diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
> > > index ee2302fbdeee..ead0c360df33 100644
> > > --- a/drivers/media/i2c/ov7670.c
> > > +++ b/drivers/media/i2c/ov7670.c
> > > @@ -810,13 +810,24 @@ static void ov7675_get_framerate(struct v4l2_subdev *sd,
> > >  			(4 * clkrc);
> > >  }
> > >  
> > > +static int ov7675_apply_framerate(struct v4l2_subdev *sd)
> > > +{
> > > +	struct ov7670_info *info = to_state(sd);
> > > +	int ret;
> > > +
> > > +	ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
> > > +	if (ret < 0)
> > > +		return ret;
> > > +
> > > +	return ov7670_write(sd, REG_DBLV, info->pll_bypass ? DBLV_BYPASS : DBLV_X4);
> > > +}
> > > +
> > >  static int ov7675_set_framerate(struct v4l2_subdev *sd,
> > >  				 struct v4l2_fract *tpf)
> > >  {
> > >  	struct ov7670_info *info = to_state(sd);
> > >  	u32 clkrc;
> > >  	int pll_factor;
> > > -	int ret;
> > >  
> > >  	/*
> > >  	 * The formula is fps = 5/4*pixclk for YUV/RGB and
> > > @@ -825,19 +836,10 @@ static int ov7675_set_framerate(struct v4l2_subdev *sd,
> > >  	 * pixclk = clock_speed / (clkrc + 1) * PLLfactor
> > >  	 *
> > >  	 */
> > > -	if (info->pll_bypass) {
> > > -		pll_factor = 1;
> > > -		ret = ov7670_write(sd, REG_DBLV, DBLV_BYPASS);
> > > -	} else {
> > > -		pll_factor = PLL_FACTOR;
> > > -		ret = ov7670_write(sd, REG_DBLV, DBLV_X4);
> > > -	}
> > > -	if (ret < 0)
> > > -		return ret;
> > > -
> > >  	if (tpf->numerator == 0 || tpf->denominator == 0) {
> > >  		clkrc = 0;
> > >  	} else {
> > > +		pll_factor = info->pll_bypass ? 1 : PLL_FACTOR;
> > >  		clkrc = (5 * pll_factor * info->clock_speed * tpf->numerator) /
> > >  			(4 * tpf->denominator);
> > >  		if (info->fmt->mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8)
> > > @@ -859,11 +861,7 @@ static int ov7675_set_framerate(struct v4l2_subdev *sd,
> > >  	/* Recalculate frame rate */
> > >  	ov7675_get_framerate(sd, tpf);
> > >  
> > > -	ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
> > > -	if (ret < 0)
> > > -		return ret;
> > > -
> > > -	return ov7670_write(sd, REG_DBLV, DBLV_X4);
> > > +	return ov7675_apply_framerate(sd);
> > >  }
> > >  
> > >  static void ov7670_get_framerate_legacy(struct v4l2_subdev *sd,
> > 
> > Unfortunately this one no longer applies due to Jacopo's patch "v4l2: i2c:
> > ov7670: Fix PLL bypass register values" in my tree. Could you resend it if
> > you still think it's useful, please?
> > 
> > My tree is here:
> > 
> > <URL:https://git.linuxtv.org/sailus/media_tree.git/log/>
> > 
> > I've applied the rest there, with a trivial patch I'll send briefly.
> 
> Thank you.
> 
> It seems that you've accidentally attached the hunks of that patch to a
> previous one though ("media: ov7670: split register setting from
> set_fmt() logic"). There's just one conflicted line to resolve left.

Ouch.

> 
> I have a branch based on your tree that reverts the patch first and
> then applies the two cleanly:
> 
>  git pull https://github.com/hackerspace/olpc-xo175-linux.git lr/ov7670

I'll be rebasing my tree anyway; Mauro picks the patches from my pull
request, not merging it as such.

> 
> Feel free to pull, or, if you're fine with rebasing your tree, remove
> the patch from your tree and then just pick the two.
> 
> Alternatively, if you prefer a patch by e-mail, please just let me know
> when you've fixed things up in your tree.

I think it'd be easiest that I take these out of the tree and let you
resend just the ov7670 patches. Could you do that? I've updated the master
branch...

-- 
Kind regards,

Sakari Ailus