linux-kernel - Re: [PATCH v2] drm/color: Document CTM eqations

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Message-ID: <20170217135451.GA18487@e106950-lin.cambridge.arm.com>
Date:   Fri, 17 Feb 2017 13:54:52 +0000
From:   Brian Starkey <brian.starkey@....com>
To:     Daniel Stone <daniel@...ishbar.org>
Cc:     Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Lionel Landwerlin <lionel.g.landwerlin@...el.com>
Subject: Re: [PATCH v2] drm/color: Document CTM eqations

What's the verdict? We've got [1] which is about to become another
(driver) implementation - better to change before that merges than
after I guess.

-Brian

[1] https://lkml.org/lkml/2017/2/13/304

On Wed, Feb 15, 2017 at 11:56:55AM +0000, Daniel Stone wrote:
>Hi,
>
>On 15 February 2017 at 11:39, Ville Syrjälä
><ville.syrjala@...ux.intel.com> wrote:
>> On Tue, Jan 31, 2017 at 06:46:39PM +0100, Daniel Vetter wrote:
>>> On Tue, Jan 31, 2017 at 6:22 PM, Ville Syrjälä
>>> <ville.syrjala@...ux.intel.com> wrote:
>>> > Hmm. Two's complement is what I was thinking it is. Which shows that
>>> > I never managed to read the code in any detail. Definitely needs to
>>> > be documented properly.
>>>
>>> That sounds supremely backwards. I guess we can't fix this anymore?
>>
>> I have no idea. Anyone else?
>
>I don't know of any implementation using this; maybe closed Intel
>Android stuff? Certainly GitHub showed no-one using it, and neither X
>nor Weston/Mutter are using it yet.
>
>Cheers,
>Daniel