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Date:   Thu, 17 Mar 2022 10:28:06 +0200
From:   Sakari Ailus <sakari.ailus@linux.intel.com>
To:     Kate Hsuan <hpa@redhat.com>
Cc:     Bingbu Cao <bingbu.cao@intel.com>,
        Tianshu Qiu <tian.shu.qiu@intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>,
        linux-media@vger.kernel.org, linux-staging@lists.linux.dev,
        linux-kernel@vger.kernel.org, hdegoede@redhat.com
Subject: Re: [PATCH v4] staging: media: ipu3: Fix AF x_start position when
 rightmost stripe is used
Message-ID: <YjLxFuRXKzg3m9HH@paasikivi.fi.intel.com>
References: <20220317075713.10633-1-hpa@redhat.com>
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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.

-- 
Sakari Ailus