From: Yuasa Yoichi <yoichi_yuasa@tripeaks.co.jp>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Ralf Baechle <ralf@linux-mips.org>,
linux-mips <linux-mips@linux-mips.org>
Subject: Re: [PATCH][MIPS] add DMA declare coherent memory support
Date: Fri, 5 Jun 2009 12:03:01 +0900 [thread overview]
Message-ID: <21eaeb5a0906042003rd106d6gad73e41a5bca2448@mail.gmail.com> (raw)
In-Reply-To: <20090603153151.GA4009@alpha.franken.de>
Hi,
2009/6/4 Thomas Bogendoerfer <tsbogend@alpha.franken.de>:
> On Thu, Jun 04, 2009 at 12:16:04AM +0900, Yoichi Yuasa wrote:
>>
>> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
>
> a little bit more description what this is all about would be quite
> helpful. I also see a problem as there is at least one MIPS machine
> (SGI IP28), which doesn't support coherent memory (at least not without
> playing dirty games with the memory controller, which in return makes
> the machine slow).
Some drivers require dma_declare_coherent_memory() (eg.
drivers/usb/host/ohci-sm501.c).
It is used to driver's local memory allocation with dma_alloc_coherent().
Yoichi
next prev parent reply other threads:[~2009-06-05 3:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-03 15:16 [PATCH][MIPS] add DMA declare coherent memory support Yoichi Yuasa
2009-06-03 15:31 ` Thomas Bogendoerfer
2009-06-05 3:03 ` Yuasa Yoichi [this message]
-- strict thread matches above, loose matches on Subject: below --
2009-11-04 7:41 Yoichi Yuasa
2009-11-04 9:44 ` Ralf Baechle
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