linux-kernel - Re: [RFC PATCH v2 1/2] drm: Add generic colorkey properties

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Message-ID: <16624973.kIn7evqk0T@dimapc>
Date:   Wed, 20 Jun 2018 15:20:26 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Alexandru Gheorghe <Alexandru_Gheorghe@...tor.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Sinclair Yeh <syeh@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/2] drm: Add generic colorkey properties

On Tuesday, 19 June 2018 20:40:12 MSK Russell King - ARM Linux wrote:
> On Tue, May 29, 2018 at 10:11:03AM +0300, Ville Syrjälä wrote:
> > On Tue, May 29, 2018 at 02:48:22AM +0300, Dmitry Osipenko wrote:
> > > Though maybe "color components replacement" and "replacement with a
> > > complete transparency" could be factored out into a specific color
> > > keying modes.> 
> > Yes. I've never seen those in any hardware. In fact I'm wondering where
> > is the userspace for all these complex modes? Ie. should we even bother
> > with them at this time?
> 
> Such hardware does exist - here's what Armada 510 supports (and is
> supported via armada-drm):

It shouldn't be a problem to extend the list of common color keying modes with 
a mode that is supported only by a particular HW. The only requirement for 
adding a new mode is that this mode must be utilized by opensource userspace 
software.