linux-kernel - Re: [PATCH] media: zoran: move to dma-mapping interface

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Date:   Wed, 25 Apr 2018 14:22:29 -0300
From:   Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        mjpeg-users@...ts.sourceforge.net,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Trent Piepho <tpiepho@...inj.com>
Subject: Re: [PATCH] media: zoran: move to dma-mapping interface

Em Wed, 25 Apr 2018 17:58:25 +0200
Arnd Bergmann <arnd@...db.de> escreveu:

> On Wed, Apr 25, 2018 at 5:26 PM, Christoph Hellwig <hch@...radead.org> wrote:
> > On Wed, Apr 25, 2018 at 01:15:18PM +0200, Arnd Bergmann wrote:  
> >> That thought had occurred to me as well. I removed the oldest ISDN
> >> drivers already some years ago, and the OSS sound drivers
> >> got removed as well, and comedi got converted to the dma-mapping
> >> interfaces, so there isn't much left at all now. This is what we
> >> have as of v4.17-rc1:  
> >
> > Yes, I've been looking at various grotty old bits to purge.  Usually
> > I've been looking for some non-tree wide patches and CCed the last
> > active people to see if they care.  In a few cases people do, but
> > most often no one does.  
> 
> Let's start with this one (zoran) then, as Mauro is keen on having
> all media drivers compile-testable on x86-64 and arm.
> 
> Trent Piepho and Hans Verkuil both worked on this driver in the
> 2008/2009 timeframe and those were the last commits from anyone
> who appears to have tested their patches on actual hardware.

Zoran is a driver for old hardware. I don't doubt that are people
out there still using it, but who knows?

I have a few those boards packed somewhere. I haven't work with PCI
hardware for a while. If needed, I can try to seek for them and
do some tests. I need first to unpack a machine with PCI slots...
the NUCs I generally use for development don't have any :-)

Anyway, except for virt_to_bus() and related stuff, I think that this
driver is in good shape, as Hans did a lot of work in the past to
make it to use the current media framework.

> 
> Trent, Hans: do you have reason to believe that there might still
> be users out there?
> 
>        Arnd



Thanks,
Mauro