linux-kernel - Re: [PATCH] drm/sun4i: de3: Be explicit about supported modifiers

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Date:   Mon, 7 Jun 2021 09:36:36 +0100
From:   Daniel Stone <daniel@...ishbar.org>
To:     Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Piotr Oniszczuk <piotr.oniszczuk@...il.com>,
        Daniel Stone <daniel.stone@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-sunxi@...ts.linux.dev,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] drm/sun4i: de3: Be explicit about supported modifiers

On Sat, 5 Jun 2021 at 08:36, Jernej Skrabec <jernej.skrabec@...il.com> wrote:
> Currently only linear formats are supported in sun4i-drm driver, but
> SoCs like H6 supports AFBC variant of some of them in multiple cores
> (GPU, VPU, DE3). Panfrost already implements AFBC compression and is
> sometimes confused what should be default choice (linear, AFBC) if DRM
> driver is not explicit about modifier support (MiniMyth2 distro with
> MythTV app).
>
> After some discussion with Daniel Stone on #panfrost IRC, it was decided
> to make modifiers in sun4i-drm explicit, to avoid any kind of guessing,
> not just in panfrost, but everywhere. In fact, long term idea is to make
> modifier parameter in drm_universal_plane_init() mandatory (non NULL).

Thanks Piotr & Jernej!

Acked-by: Daniel Stone <daniels@...labora.com>

Cheers,
Daniel