linux-kernel - Re: [RFC PATCH v6 02/11] media: v4l2: Extend pixel formats to unify single/multi-planar handling (and more)

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Date:   Tue, 15 Nov 2022 10:57:59 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Hsia-Jun Li <Randy.Li@...aptics.com>
Cc:     mchehab@...nel.org, hans.verkuil@...co.com,
        laurent.pinchart@...asonboard.com, sakari.ailus@....fi,
        boris.brezillon@...labora.com, hiroh@...omium.org,
        Brian.Starkey@....com, kernel@...labora.com,
        narmstrong@...libre.com, linux-kernel@...r.kernel.org,
        frkoenig@...omium.org, stanimir.varbanov@...aro.org,
        tfiga@...omium.org, Hans Verkuil <hverkuil@...all.nl>,
        linux-media@...r.kernel.org
Subject: Re: [RFC PATCH v6 02/11] media: v4l2: Extend pixel formats to unify
 single/multi-planar handling (and more)

Le vendredi 11 novembre 2022 à 11:03 +0800, Hsia-Jun Li a écrit :
> There are four modifiers in DRM while we would only one in these patches.
>  From the EGL
> https://registry.khronos.org/EGL/extensions/EXT/EGL_EXT_image_dma_buf_import_modifiers.txt
> 
> The modifier for echo plane could be different. I wish it would be 
> better to create a framebuffer being aware of which planes are graphics 
> or metadata.

I was told that having different modifiers per plane is not supported and just
an historical artifact of an over-engineered API design.

Nicolas