linux-kernel - Re: [RFC PATCH v3 2/3] drm: add support modifiers for drivers whose planes only support linear layout

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Date:   Fri, 14 Jan 2022 15:42:54 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Tomohito Esaki <etom@...l.co.jp>, dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Ben Skeggs <bskeggs@...hat.com>,
        Michel Dänzer <mdaenzer@...hat.com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Mark Yacoub <markyacoub@...omium.org>,
        Sean Paul <seanpaul@...omium.org>,
        Evan Quan <evan.quan@....com>, Petr Mladek <pmladek@...e.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        nouveau@...ts.freedesktop.org, Daniel Stone <daniel@...ishbar.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Damian Hobson-Garcia <dhobsong@...l.co.jp>,
        Takanari Hayama <taki@...l.co.jp>
Subject: Re: [RFC PATCH v3 2/3] drm: add support modifiers for drivers whose planes only support linear layout

On Friday, January 14th, 2022 at 16:17, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> On Fri, Jan 14, 2022 at 03:07:21PM +0000, Simon Ser wrote:
> > On Friday, January 14th, 2022 at 15:16, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > > Why not enum?
> >
> > There is no enum for DRM format modifiers.
>
> I'm not sure how this prevents to use enum in the code instead of const u64.
> Any specific reason for that?

I'm not sure how one would use an enum as the array item type, when there is no
defined enum type.

Moreover, all the rest of DRM uses uint64 for modifiers.