From: David Brownell <david-b@pacbell.net>
To: Alessandro Rubini <rubini-list@gnudd.com>
Cc: linux-input@vger.kernel.org, linux@arm.linux.org.uk,
linux-arm-kernel@lists.arm.linux.org.uk
Subject: Re: [PATCH] ads7846: allocate separate cache lines for tx and rx data
Date: Thu, 16 Jul 2009 01:35:51 -0700 [thread overview]
Message-ID: <200907160135.51307.david-b@pacbell.net> (raw)
In-Reply-To: <20090716081527.GA29374@mail.gnudd.com>
On Thursday 16 July 2009, Alessandro Rubini wrote:
> > Note that this issue is unrelated to full duplex DMA support.
>
> Yes, that's right. But full duplex is not involved here, it's
> just 2 or 3 rounds of "one byte tx then two bytes rx".
Then your patch description was *seriously* misleading:
> > > Since the SPI master might use DMA, tx and rx buffers must live on
> > > different cache lines. ...
I'll have another look at that patch to see if it could make
sense after I discard the description.
- dave
prev parent reply other threads:[~2009-07-16 8:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-15 9:33 [PATCH] ads7846: allocate separate cache lines for tx and rx data Alessandro Rubini
2009-07-15 18:06 ` David Brownell
2009-07-15 19:33 ` Alessandro Rubini
2009-07-16 7:15 ` Russell King - ARM Linux
2009-07-16 7:22 ` Russell King - ARM Linux
2009-07-16 7:56 ` David Brownell
2009-07-16 7:28 ` David Brownell
2009-07-16 10:00 ` Marek Vasut
2009-07-16 15:35 ` David Brownell
2009-07-16 20:06 ` Russell King - ARM Linux
2009-07-16 7:51 ` David Brownell
2009-07-16 8:15 ` Alessandro Rubini
2009-07-16 8:35 ` David Brownell [this message]
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