linux-kernel - Re: [PATCH] drm/komeda: Adds output-color format/depth support

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Date:   Fri, 27 Sep 2019 02:22:24 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Brian Starkey <Brian.Starkey@....com>
CC:     "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        Liviu Dudau <Liviu.Dudau@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Mihail Atanassov <Mihail.Atanassov@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH] drm/komeda: Adds output-color format/depth support

On Wed, Sep 25, 2019 at 09:48:11AM +0000, Brian Starkey wrote:
> Hi James,
> 
> On Tue, Sep 24, 2019 at 02:13:27AM +0000, james qian wang (Arm Technology China) wrote:
> > 
> > Hi Brian:
> > 
> > Since one monitor can support mutiple color-formats, this DT property
> > supply a way for user to select a specific one from this supported
> > color-formats.
> 
> Modifying DT is a _really_ user-unfriendly way of specifying
> preferences. If we want a user to be able to pick a preferred format,
> then it should probably be via the atomic API as Ville mentioned.
>

Hi Brian:

Agree, a drm UPAI might be the best & right way for this.

I can raise a new thread/topic to discuss the "HOW TO", maybe after the
Chinese national day.

LAST:
what do you think about this patch:
- Just drop it, waiting for the new uapi
- or keep it, and replace it once new uapi is ready.

Thanks
James

> Cheers,
> -Brian