linux-kernel - Re: [PATCH v4 17/20] media: i2c: ov4689: Configurable analogue crop

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Message-ID: <Zh4e9q_RFIe-JIzz@kekkonen.localdomain>
Date: Tue, 16 Apr 2024 06:47:18 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Mikhail Rudenko <mike.rudenko@...il.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Jacopo Mondi <jacopo@...ndi.org>,
	Tommaso Merciai <tomm.merciai@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Kieran Bingham <kieran.bingham@...asonboard.com>
Subject: Re: [PATCH v4 17/20] media: i2c: ov4689: Configurable analogue crop

On Mon, Apr 15, 2024 at 11:22:09PM +0300, Mikhail Rudenko wrote:
> 
> Hi Sakari,
> 
> On 2024-04-15 at 06:08 GMT, Sakari Ailus <sakari.ailus@...ux.intel.com> wrote:
> 
> > Hi Mikhail,
> >
> > On Tue, Apr 02, 2024 at 07:45:48PM +0300, Mikhail Rudenko wrote:
> >> Implement configurable analogue crop via .set_selection call.
> >> ov4689_init_cfg is modified to initialize default subdev selection.
> >> Offsets are aligned to 2 to preserve Bayer order, selection width is
> >> aligned to 4 and height to 2 to meet hardware requirements.
> >>
> >> Experimentally discovered values of the cropping-related registers and
> >> vfifo_read_start for various output sizes are used. Default BLC anchor
> >> positions are used for the default analogue crop, scaling down
> >> proportionally for the smaller crop sizes.
> >>
> >> When analogue crop is adjusted, several consequential actions take
> >> place: the output format is reset, exposure/vblank/hblank control
> >> ranges and default values are adjusted accordingly. Additionally,
> >> ov4689_set_ctrl utilizes pad crop instead of cur_mode width and
> >> height for HTS and VTS calculation. Also, ov4689_enum_frame_sizes is
> >> modified to report crop size as available frame size.
> >
> > We're amidst of a change to the APIs touching sensors with the the
> > introduction of the internal pads.
> > <URL:https://lore.kernel.org/linux-media/20240313072516.241106-1-sakari.ailus@linux.intel.com/T/#t>.
> >
> > I'd therefore postpone this bit so it would align with the new practices
> > (also subject to change in the metadata set).
> >
> > The rest of the patches would seem more or less ready for merging to me.
> 
> Okay, so I'll post a v5 of patches 1-16 with whitespace fixes (as you
> suggested in patch 20) soon, and the remaining patches affected by the
> metadata-related API changes as a separate series as soon those changes
> land in media_stage. Do I get you right?

Yes, please.

-- 
Sakari Ailus