From: David Brownell <david-b@pacbell.net>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Alessandro Rubini <rubini-list@gnudd.com>,
linux-input@vger.kernel.org,
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 00:56:33 -0700 [thread overview]
Message-ID: <200907160056.33302.david-b@pacbell.net> (raw)
In-Reply-To: <20090716072226.GA8113@n2100.arm.linux.org.uk>
On Thursday 16 July 2009, Russell King - ARM Linux wrote:
> ... and until that happens, I suggest you remove the ADS7846 chip from
> your hardware; as that DMA stuff in the driver currently stands, it
> can NEVER work on ARM or any other DMA cache incoherent CPU which uses
> DMA for SPI transfers.
Wrong again. There's a localized issue, easily enough fixed.
As noted by Alessandro, earlier: the touchscreen logic does
not have this issue. Only the ADC logic.
- Dave
p.s. Note by the way that L-A-K is only getting Russell's
flamage, not the responses disproving his claims.
next prev parent reply other threads:[~2009-07-16 7:56 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 [this message]
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
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