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

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Date: Mon, 15 Apr 2024 23:22:09 +0300
From: Mikhail Rudenko <mike.rudenko@...il.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.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


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?

--
Best regards,
Mikhail Rudenko