linux-kernel - Re: [PATCH v5 1/4] fixp-arith: add a linear interpolation function

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Message-ID: <CACRpkdb-GeOUSPQeJoMe-My-ZugdPWn0DDVQST5e7XFzt1TmHw@mail.gmail.com>
Date:   Wed, 13 Jun 2018 13:12:45 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Craig Tatlor <ctatlor97@...il.com>
Cc:     linux-arm-msm@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/4] fixp-arith: add a linear interpolation function

On Wed, Jun 13, 2018 at 1:06 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Thu, Jun 7, 2018 at 8:12 PM, Craig Tatlor <ctatlor97@...il.com> wrote:
>
>> Adds a function to interpolate against two points,
>> this is carried arount as a helper function by tons of drivers.
>>
>> Signed-off-by: Craig Tatlor <ctatlor97@...il.com>
>
> The linear formula seems to fit the most natural form of linear
> interpolation.
>
> I bet some John Carmack algorithm type people will soon
> start to optimize this... :D

For your entertainment here is some sunday reading:
https://fgiesen.wordpress.com/2012/08/15/linear-interpolation-past-present-and-future/

Yours,
Linus Walleij