linux-kernel - Re: [PATCH] sh: maple: Update the maple bus driver to support block reads and writes

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Date:	Fri, 27 Feb 2009 16:06:34 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Adrian McMenamin <adrian@...golddream.dyndns.info>
Cc:	Greg KH <greg@...ah.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input <linux-input@...r.kernel.org>,
	linux-sh <linux-sh@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sh: maple: Update the maple bus driver to support block reads and writes

On Sat, Feb 14, 2009 at 08:16:45PM +0000, Adrian McMenamin wrote:
> On Sat, 2009-02-14 at 20:06 +0000, Adrian McMenamin wrote:
> > Greg,
> > 
> > This patch updates the maple bus to support asynchronous block reads and
> > writes as well as generally improving the quality of the code and
> > supporting concurrency (all needed to support the Dreamcast visual
> > memory unit - a driver will also be posted for that).
> > 
> > I have posted versions of this before but am here following the patch
> > grouping suggested and have also tested this code and unlike earlier
> > versions it shows no signs of suffering from race conditions - so I hope
> > you will be happy to queue it for inclusion.
> > 
> > Changes in the bus driver necessitate some changes in the two maple bus
> > input drivers that are currently in mainline.
> > 
> > (Maple is SEGA's proprietary serial bus for the Dreamcast. It is capable
> > of comm speeds of up to 2Mbs.)
> > 
> > As well as supporting block reads and writes this code clean up removes
> > some poor handling of locks, uses an atomic status variable to serialise
> > access to devices and more robusly handles the general performance
> > problems of the bus.
> > 
> Apologies, some of the VMU patch slipped into that. Here is a completely
> clean version.
> 
> Signed-off-by: Adrian McMenamin <adrian@...en.demon.co.uk>

Applied, thanks.
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