From: Larry Finger <Larry.Finger@lwfinger.net>
To: "Rafał Miłecki" <zajec5@gmail.com>
Cc: "Michael Büsch" <m@bues.ch>,
linux-wireless@vger.kernel.org,
"John W. Linville" <linville@tuxdriver.com>,
"Pavel Roskin" <proski@gnu.org>,
b43-dev@lists.infradead.org
Subject: Re: [PATCH 1/3] b43: replace DMA translation workarounds with just a one, commented
Date: Wed, 20 Jul 2011 03:30:12 -0500 [thread overview]
Message-ID: <4E269214.9050308@lwfinger.net> (raw)
In-Reply-To: <CACna6rwMe9-dHANpDLko5yy5wu521YTGXmqBr1JYh18tYt+Z4A@mail.gmail.com>
On 07/20/2011 01:16 AM, Rafał Miłecki wrote:
> W dniu 20 lipca 2011 01:15 użytkownik Michael Büsch<m@bues.ch> napisał:
>> On Wed, 20 Jul 2011 00:12:20 +0200
>> Rafał Miłecki<zajec5@gmail.com> wrote:
>>> + * be fixed on ssb side, but requires testing with b43,
>>> + * b43legacy and b44. */
>>
>> No it doesn't. b44 and b43legacy don't use 64bit DMA.
>> Just fix it in ssb, please.
>
> They (drivers) don't, but what if we start giving them routing for
> 64-bit DMA? AFAIU they treat 64-bit DMA as 32-bit one (according to
> specs: "If 64 Bit isn't an option, Silicon Backplane and PCI-E buses
> can use 32 bit DMA.").
>
> Won't they start using 64-bit DMA in the 32-bit way but with 64-bit
> routing bits?
The BCM4311 was the first device that supported 64-bit DMA. I had the first of
those, and I got to debug the 64-bit stuff that had been written by Michael, but
there had been no hardware for testing. All earlier devices were restricted to
32-bit paths.
Larry
next prev parent reply other threads:[~2011-07-20 8:30 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-19 22:12 [PATCH 0/3] b43 & bcma: DMA special (translation) bits Rafał Miłecki
2011-07-19 22:12 ` [PATCH 1/3] b43: replace DMA translation workarounds with just a one, commented Rafał Miłecki
2011-07-19 22:53 ` Larry Finger
2011-07-19 23:15 ` Michael Büsch
2011-07-20 6:16 ` Rafał Miłecki
2011-07-20 8:30 ` Larry Finger [this message]
2011-07-20 8:55 ` Michael Büsch
2011-07-20 11:10 ` Rafał Miłecki
2011-07-20 15:35 ` Michael Büsch
2011-07-19 22:12 ` [PATCH 2/3] bcma: inform drivers about translation bits needed for the core Rafał Miłecki
2011-07-19 22:12 ` [PATCH 3/3] b43: bcma: get DMA translation bits Rafał Miłecki
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