linux-kernel - Re: [PATCH v2 31/43] drm/sun4i: Add a dedicated ioctl call for allocating tiled buffers

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Message-ID: <20181127090344.qlrksisbbmcjm3ac@flea>
Date:   Tue, 27 Nov 2018 10:03:44 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Brian Starkey <Brian.Starkey@....com>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Sean Paul <sean@...rly.run>, nd <nd@....com>
Subject: Re: [PATCH v2 31/43] drm/sun4i: Add a dedicated ioctl call for
 allocating tiled buffers

On Fri, Nov 23, 2018 at 11:30:20AM +0000, Brian Starkey wrote:
> Hi Paul,
> 
> On Fri, Nov 23, 2018 at 10:25:03AM +0100, Paul Kocialkowski wrote:
> >This introduces a dedicated ioctl for allocating buffers for the VPU
> >tiling mode. It allows setting up buffers that comply to the hardware
> >alignment requirements, by aligning the stride and height to 32 bytes.
> >
> >Only YUV semiplanar and planar formats are allowed by the ioctl, as the
> >hardware does not support the tiling mode for other formats.
> 
> What's the general feeling about a more generic version of this ioctl?
> There doesn't seem to be anything Allwinner-specific in the ioctl
> arguments.

I'm definitely in favor of having such an ioctl.

maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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