linux-kernel - Re: [PATCH v4] staging: media: ipu3: Fix AF x_start position when rightmost stripe is used

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Message-ID: <YjL6/wOVjSvZjSZ5@paasikivi.fi.intel.com>
Date:   Thu, 17 Mar 2022 11:10:23 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Kate Hsuan <hpa@...hat.com>
Cc:     Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jean-Michel Hautbois <jeanmichel.hautbois@...asonboard.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Hans De Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v4] staging: media: ipu3: Fix AF x_start position when
 rightmost stripe is used

On Thu, Mar 17, 2022 at 04:53:07PM +0800, Kate Hsuan wrote:
> Hi Sakari,
> 
> On Thu, Mar 17, 2022 at 4:28 PM Sakari Ailus
> <sakari.ailus@...ux.intel.com> wrote:
> >
> > On Thu, Mar 17, 2022 at 03:57:13PM +0800, Kate Hsuan wrote:
> > > For the AF configuration, if the rightmost stripe is used, the AF scene
> > > will be at the incorrect location of the sensor.
> > >
> > > The AF coordinate may be set to the right part of the sensor. This
> > > configuration would lead to x_start being greater than the
> > > down_scaled_stripes offset and the leftmost stripe would be disabled
> > > and only the rightmost stripe is used to control the AF coordinate. If
> > > the x_start doesn't perform any adjustments, the AF coordinate will be
> > > at the wrong place of the sensor since down_scaled_stripes offset
> > > would be the new zero of the coordinate system.
> > >
> > > In this patch, if only the rightmost stripe is used, x_start should
> > > minus down_scaled_stripes offset to maintain its correctness of AF
> > > scene coordinate.
> > >
> > > Changes in v2:
> > > 1. Remove the setting of the first stripe.
> > >
> > > Changes in v4:
> > > 1. x_start is estimated based on the method for both stripes are enabled.
> > > 2. x_end is estimated based on the width.
> >
> > Please put the changelog before '---' line. I've removed it from the commit
> > message this time.

I meant to say after. Then it won't be part of the commit message.

> >
> > --
> > Sakari Ailus
> >
> 
> Okay, I got it.
> 
> Thank you.
> 
> -- 
> BR,
> Kate
> 

-- 
Sakari Ailus