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Date: Mon, 18 Dec 2023 13:03:31 +0200
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Tommaso Merciai <tomm.merciai@gmail.com>
Cc: linuxfancy@googlegroups.com, sakari.ailus@linux.intel.com,
	Martin Hecht <martin.hecht@avnet.eu>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] media: i2c: alvium: store frame interval in subdev
 state
Message-ID: <20231218110331.GQ5290@pendragon.ideasonboard.com>
References: <20231215082452.1720481-1-tomm.merciai@gmail.com>
 <20231215082452.1720481-4-tomm.merciai@gmail.com>
 <20231218025905.GJ5290@pendragon.ideasonboard.com>
 <ZYAfThT/mHdzGdAh@tom-HP-ZBook-Fury-15-G7-Mobile-Workstation>
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On Mon, Dec 18, 2023 at 11:30:38AM +0100, Tommaso Merciai wrote:
> Hi Laurent,
> 
> On Mon, Dec 18, 2023 at 04:59:05AM +0200, Laurent Pinchart wrote:
> > Hi Tommaso,
> > 
> > Thank you for the patch.
> > 
> > On Fri, Dec 15, 2023 at 09:24:52AM +0100, Tommaso Merciai wrote:
> > > Use the newly added storage for frame interval in the subdev state to
> > > simplify the driver.
> > > 
> > > Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
> > > ---
> > >  drivers/media/i2c/alvium-csi2.c | 40 ++++++++++-----------------------
> > >  drivers/media/i2c/alvium-csi2.h |  2 --
> > >  2 files changed, 12 insertions(+), 30 deletions(-)
> > > 
> > > diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
> > > index fde456357be1..81f683b3c849 100644
> > > --- a/drivers/media/i2c/alvium-csi2.c
> > > +++ b/drivers/media/i2c/alvium-csi2.c
> > > @@ -1643,25 +1643,6 @@ static int alvium_hw_init(struct alvium_dev *alvium)
> > >  }
> > >  
> > >  /* --------------- Subdev Operations --------------- */
> > > -
> > > -static int alvium_g_frame_interval(struct v4l2_subdev *sd,
> > > -				   struct v4l2_subdev_state *sd_state,
> > > -				   struct v4l2_subdev_frame_interval *fi)
> > > -{
> > > -	struct alvium_dev *alvium = sd_to_alvium(sd);
> > > -
> > > -	/*
> > > -	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
> > > -	 * subdev active state API.
> > > -	 */
> > > -	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
> > > -		return -EINVAL;
> > > -
> > > -	fi->interval = alvium->frame_interval;
> > > -
> > > -	return 0;
> > > -}
> > > -
> > >  static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> > >  				   struct v4l2_subdev_state *sd_state,
> > >  				   struct v4l2_subdev_frame_interval *fi)
> > > @@ -1669,6 +1650,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> > >  	struct alvium_dev *alvium = sd_to_alvium(sd);
> > >  	struct device *dev = &alvium->i2c_client->dev;
> > >  	u64 req_fr, dft_fr, min_fr, max_fr;
> > > +	struct v4l2_fract *interval;
> > >  	int ret;
> > >  
> > >  	/*
> > 
> > You should drop the FIXME comment here and the ACTIVE check...
> 
> Oks, thanks.
> 
> > 
> > > @@ -1701,9 +1683,10 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> > >  	if (req_fr >= max_fr && req_fr <= min_fr)
> > >  		req_fr = dft_fr;
> > >  
> > > -	alvium->fr = req_fr;
> > > -	alvium->frame_interval.numerator = fi->interval.numerator;
> > > -	alvium->frame_interval.denominator = fi->interval.denominator;
> > > +	interval = v4l2_subdev_state_get_interval(sd_state, 0);
> > > +
> > > +	interval->numerator = fi->interval.numerator;
> > > +	interval->denominator = fi->interval.denominator;
> > >  
> > 
> > ... and here only call alvium_set_frame_rate() for the ACTIVE frame
> > interval.
> 
> I don't completely got this comment, can you give me more details about
> please. Thanks in advance!

alvium_s_frame_interval() can be called both for the TRY and ACTIVE
status. The hardware registers should be written only for the ACTIVE
state.

> > >  	return alvium_set_frame_rate(alvium, req_fr);
> > >  }
> > > @@ -1853,6 +1836,7 @@ static int alvium_init_state(struct v4l2_subdev *sd,
> > >  {
> > >  	struct alvium_dev *alvium = sd_to_alvium(sd);
> > >  	struct alvium_mode *mode = &alvium->mode;
> > > +	struct v4l2_fract *interval;
> > >  	struct v4l2_subdev_format sd_fmt = {
> > >  		.which = V4L2_SUBDEV_FORMAT_TRY,
> > >  		.format = alvium_csi2_default_fmt,
> > > @@ -1870,6 +1854,11 @@ static int alvium_init_state(struct v4l2_subdev *sd,
> > >  	*v4l2_subdev_state_get_crop(state, 0) = sd_crop.rect;
> > >  	*v4l2_subdev_state_get_format(state, 0) = sd_fmt.format;
> > >  
> > > +	/* Setup initial frame interval*/
> > > +	interval = v4l2_subdev_state_get_interval(state, 0);
> > > +	interval->numerator = 1;
> > > +	interval->denominator = ALVIUM_DEFAULT_FR_HZ;
> > > +
> > >  	return 0;
> > >  }
> > >  
> > > @@ -2239,7 +2228,7 @@ static const struct v4l2_subdev_pad_ops alvium_pad_ops = {
> > >  	.set_fmt = alvium_set_fmt,
> > >  	.get_selection = alvium_get_selection,
> > >  	.set_selection = alvium_set_selection,
> > > -	.get_frame_interval = alvium_g_frame_interval,
> > > +	.get_frame_interval = v4l2_subdev_get_frame_interval,
> > >  	.set_frame_interval = alvium_s_frame_interval,
> > >  };
> > >  
> > > @@ -2260,11 +2249,6 @@ static int alvium_subdev_init(struct alvium_dev *alvium)
> > >  	struct v4l2_subdev *sd = &alvium->sd;
> > >  	int ret;
> > >  
> > > -	/* Setup initial frame interval*/
> > > -	alvium->frame_interval.numerator = 1;
> > > -	alvium->frame_interval.denominator = ALVIUM_DEFAULT_FR_HZ;
> > > -	alvium->fr = ALVIUM_DEFAULT_FR_HZ;
> > > -
> > >  	/* Setup the initial mode */
> > >  	alvium->mode.fmt = alvium_csi2_default_fmt;
> > >  	alvium->mode.width = alvium_csi2_default_fmt.width;
> > > diff --git a/drivers/media/i2c/alvium-csi2.h b/drivers/media/i2c/alvium-csi2.h
> > > index a6529b28e7dd..f5e26257b042 100644
> > > --- a/drivers/media/i2c/alvium-csi2.h
> > > +++ b/drivers/media/i2c/alvium-csi2.h
> > > @@ -442,8 +442,6 @@ struct alvium_dev {
> > >  	s32 inc_sharp;
> > >  
> > >  	struct alvium_mode mode;
> > > -	struct v4l2_fract frame_interval;
> > > -	u64 fr;
> > 
> > The fr field should have been removed by a previous patch (the one that
> > will go between 1/3 an 2/3, see my review of 1/3) as shown by the fact
> > that this patch only removes two locations where the field is set but
> > none where it's read.
> > 
> > >  
> > >  	u8 h_sup_csi_lanes;
> > >  	u64 link_freq;

-- 
Regards,

Laurent Pinchart