linux-kernel - Re: [PATCH v1 0/2] NVIDIA Tegra20 video decoder driver

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Message-ID: <20170926065447.GC6250@kroah.com>
Date:   Tue, 26 Sep 2017 08:54:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh+dt@...nel.org>, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v1 0/2] NVIDIA Tegra20 video decoder driver

On Tue, Sep 26, 2017 at 01:15:41AM +0300, Dmitry Osipenko wrote:
> This driver provides accelerated video decoding to NVIDIA Tegra20 SoC's,
> it is a result of reverse-engineering efforts. Driver has been tested on
> Toshiba AC100 and Acer A500, it should work on any Tegra20 device.
> 
> In userspace this driver is utilized by libvdpau-tegra [0] that implements
> VDPAU interface, so any video player that supports VDPAU can provide
> accelerated video decoding on Tegra20 on Linux.

Why not use the v4l2 api instead?  Doesn't that provide the same needed
user/kernel api here instead of creating yet-another-custom ioctl?

thanks,

greg k-h