linux-kernel - Re: [PATCH v2 2/2] drm/vkms: set plane modifiers

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Message-ID: <t1g_xNE6hgj1nTQfx2UWob1wbsCAxElBvWRwNSY_EzmlEe_9WWpq8-vQKyJPK6wZY8q8BqHl-KoGwS5V91VgN8lGIl3PJt7s2fkdsRd3y70=@emersion.fr>
Date:   Tue, 21 Dec 2021 10:39:34 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     rodrigosiqueiramelo@...il.com, melissa.srw@...il.com,
        hamohammed.sa@...il.com, daniel@...ll.ch, airlied@...ux.ie,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        cphealy@...il.com
Subject: Re: [PATCH v2 2/2] drm/vkms: set plane modifiers

Overall looks good, but it is a bit repetitive to copy & paste this in all
drivers. It'd be nice to provide a core helper to do this, and then drivers
can just set format_mod_supported to the helper if they don't have more
involved logic. Thoughts?

See drm_plane_check_pixel_format, where the logic is already implemented.

Alternatively… We can just support a missing format_mod_supported in
create_in_format_blob. This sounds like this was the original intention of
db1689aa61bd ("drm: Create a format/modifier blob") and
drm_plane_check_pixel_format.