From: matthieu.castet@parrot.com (Matthieu CASTET)
To: linux-arm-kernel@lists.infradead.org
Subject: Problem with non aligned DMA in usbnet on ARM
Date: Thu, 12 Aug 2010 19:01:20 +0200 [thread overview]
Message-ID: <4C6428E0.8040402@parrot.com> (raw)
In-Reply-To: <4C6324B2.2080606@gmail.com>
Martin Fuzzey a ?crit :
> Greg KH wrote:
>> Can you fix this in the host controller driver?
>>
>>
> Technically yes (by copying the unaligned buffers).
>
> But if we do decide that USB must support unaligned buffers wouldn't it
> be better to have the HCD indicate it's alignment requirement to the
> core and have the core do the copying?
>
> Gary King sent a message to this thread but only to the arm list saying
> he has the same problem with the tegra hcd (which doesn't seem to be in
> the tree yet.) I don't know if any of the other in tree HCDs have this
> problem.
dwc otg also got this limitation. I don't know if the version submitted
for inclusion handle unaligned buffers.
Matthieu
WARNING: multiple messages have this Message-ID (diff)
From: Matthieu CASTET <matthieu.castet@parrot.com>
To: "mfuzzey@gmail.com" <mfuzzey@gmail.com>
Cc: Greg KH <greg@kroah.com>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
linux-usb <linux-usb@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>, <fchen@apm.com>
Subject: Re: Problem with non aligned DMA in usbnet on ARM
Date: Thu, 12 Aug 2010 19:01:20 +0200 [thread overview]
Message-ID: <4C6428E0.8040402@parrot.com> (raw)
In-Reply-To: <4C6324B2.2080606@gmail.com>
Martin Fuzzey a écrit :
> Greg KH wrote:
>> Can you fix this in the host controller driver?
>>
>>
> Technically yes (by copying the unaligned buffers).
>
> But if we do decide that USB must support unaligned buffers wouldn't it
> be better to have the HCD indicate it's alignment requirement to the
> core and have the core do the copying?
>
> Gary King sent a message to this thread but only to the arm list saying
> he has the same problem with the tegra hcd (which doesn't seem to be in
> the tree yet.) I don't know if any of the other in tree HCDs have this
> problem.
dwc otg also got this limitation. I don't know if the version submitted
for inclusion handle unaligned buffers.
Matthieu
next prev parent reply other threads:[~2010-08-12 17:01 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-11 9:41 Problem with non aligned DMA in usbnet on ARM Martin Fuzzey
2010-08-11 9:41 ` Martin Fuzzey
2010-08-11 9:54 ` Russell King - ARM Linux
2010-08-11 9:54 ` Russell King - ARM Linux
2010-08-11 10:11 ` Martin Fuzzey
2010-08-11 10:11 ` Martin Fuzzey
2010-08-11 15:04 ` Greg KH
2010-08-11 15:04 ` Greg KH
2010-08-11 16:08 ` Martin Fuzzey
2010-08-11 16:08 ` Martin Fuzzey
2010-08-11 17:42 ` Greg KH
2010-08-11 17:42 ` Greg KH
2010-08-11 19:07 ` Martin Fuzzey
2010-08-11 19:07 ` Martin Fuzzey
2010-08-11 20:13 ` Greg KH
2010-08-11 20:13 ` Greg KH
2010-08-11 22:31 ` Martin Fuzzey
2010-08-11 22:31 ` Martin Fuzzey
2010-08-12 17:01 ` Matthieu CASTET [this message]
2010-08-12 17:01 ` Matthieu CASTET
2010-08-11 19:10 ` Oliver Neukum
2010-08-11 19:10 ` Oliver Neukum
2010-08-11 9:59 ` Matthieu CASTET
2010-08-11 9:59 ` Matthieu CASTET
2010-08-11 11:38 ` Martin Fuzzey
2010-08-11 11:38 ` Martin Fuzzey
2010-08-11 15:54 ` Gary King
2010-08-11 20:35 ` Russell King - ARM Linux
2010-08-11 22:20 ` Martin Fuzzey
2010-08-11 22:20 ` Martin Fuzzey
2010-08-11 22:47 ` Russell King - ARM Linux
2010-08-11 22:47 ` Russell King - ARM Linux
2010-08-12 17:08 ` Matthieu CASTET
2010-08-12 17:08 ` Matthieu CASTET
2010-08-13 10:06 ` Martin Fuzzey
2010-08-13 10:06 ` Martin Fuzzey
2010-08-13 10:58 ` Oliver Neukum
2010-08-13 10:58 ` Oliver Neukum
2010-08-13 13:42 ` David Brownell
2010-08-13 13:42 ` David Brownell
2010-08-13 13:53 ` Oliver Neukum
2010-08-13 13:53 ` Oliver Neukum
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