From: Stephen Warren <swarren@nvidia.com>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>, Greg KH <greg@kroah.com>,
"ming.lei@canonical.com" <ming.lei@canonical.com>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
Will Deacon <Will.Deacon@arm.com>, Marc Dietich <marvin24@gmx.de>,
"stern@rowland.harvard.edu" <stern@rowland.harvard.edu>,
Mark Salter <msalter@redhat.com>,
Chen Peter-B29397 <B29397@freescale.com>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH] usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
Date: Fri, 2 Sep 2011 10:07:11 -0700 [thread overview]
Message-ID: <74CDBE0F657A3D45AFBB94109FB122FF04B327A5C1@HQMAIL01.nvidia.com> (raw)
In-Reply-To: <4E60A702.1060504@arm.com>
Marc Zyngier wrote at Friday, September 02, 2011 3:51 AM:
> On 01/09/11 20:08, Stephen Warren wrote:
> > Marc Dietich wrote at Thursday, September 01, 2011 5:14 AM:
> >> I'll add Stephen Warren from NVIDIA to the CC list. He has more HW to test on.
> >
> > Here are the results I found:
> >
> > Harmony:
> > Tegra USB3 -> SMSC9514 hub: NOT affected
> > (Unplugging LAN cable, or disabling SMSC9514 LAN driver doesn't change this)
...
> I just noticed something else. Harmony is fast *most of the time*. In
> about one in 3 reboots, I get the slow behavior. When USB is fast, I
> also have I2C interrupts "screaming":
>
> 85: 294321 0 GIC tegra-i2c
> 116: 0 0 GIC tegra-i2c
> 118: 98542 0 GIC tps6586x
>
> This is a couple of seconds after boot.
>
> When USB is slow, I see the following:
> [ 0.385270] tps6586x 3-0034: Chip ID read failed: -121
> [ 0.390584] tps6586x: probe of 3-0034 failed with error -5
>
> ... and I2C interrupt is quiet.
>
> The I2C interrupt handler calls writel(), which does a cache sync. That
> would explain the "fast" behavior of Harmony.
>
> Do you see the same this on your board?
Yes, I re-ran the test a few more times and see those exact same symptoms.
In a case with the screaming I2C interrupts and fast USB, I then did:
echo 3-0034 > /sys/bus/i2c/drivers/tps6586x/unbind
(I got a kernel BUG and bash crashed here, but just logged back in)
which caused the I2C interrupt handler to stop, then re-ran the test.
I then saw the slow USB speed.
So, now I think *all* platforms(boards) are affected, right?
--
nvpublic
WARNING: multiple messages have this Message-ID (diff)
From: swarren@nvidia.com (Stephen Warren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
Date: Fri, 2 Sep 2011 10:07:11 -0700 [thread overview]
Message-ID: <74CDBE0F657A3D45AFBB94109FB122FF04B327A5C1@HQMAIL01.nvidia.com> (raw)
In-Reply-To: <4E60A702.1060504@arm.com>
Marc Zyngier wrote at Friday, September 02, 2011 3:51 AM:
> On 01/09/11 20:08, Stephen Warren wrote:
> > Marc Dietich wrote at Thursday, September 01, 2011 5:14 AM:
> >> I'll add Stephen Warren from NVIDIA to the CC list. He has more HW to test on.
> >
> > Here are the results I found:
> >
> > Harmony:
> > Tegra USB3 -> SMSC9514 hub: NOT affected
> > (Unplugging LAN cable, or disabling SMSC9514 LAN driver doesn't change this)
...
> I just noticed something else. Harmony is fast *most of the time*. In
> about one in 3 reboots, I get the slow behavior. When USB is fast, I
> also have I2C interrupts "screaming":
>
> 85: 294321 0 GIC tegra-i2c
> 116: 0 0 GIC tegra-i2c
> 118: 98542 0 GIC tps6586x
>
> This is a couple of seconds after boot.
>
> When USB is slow, I see the following:
> [ 0.385270] tps6586x 3-0034: Chip ID read failed: -121
> [ 0.390584] tps6586x: probe of 3-0034 failed with error -5
>
> ... and I2C interrupt is quiet.
>
> The I2C interrupt handler calls writel(), which does a cache sync. That
> would explain the "fast" behavior of Harmony.
>
> Do you see the same this on your board?
Yes, I re-ran the test a few more times and see those exact same symptoms.
In a case with the screaming I2C interrupts and fast USB, I then did:
echo 3-0034 > /sys/bus/i2c/drivers/tps6586x/unbind
(I got a kernel BUG and bash crashed here, but just logged back in)
which caused the I2C interrupt handler to stop, then re-ran the test.
I then saw the slow USB speed.
So, now I think *all* platforms(boards) are affected, right?
--
nvpublic
next prev parent reply other threads:[~2011-09-02 17:07 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-30 16:03 [PATCH] usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw
2011-08-30 16:03 ` ming.lei at canonical.com
2011-08-30 16:15 ` Alan Stern
2011-08-30 16:15 ` Alan Stern
2011-08-30 16:38 ` Mark Salter
2011-08-30 16:38 ` Mark Salter
2011-08-30 17:15 ` Alan Stern
2011-08-30 17:15 ` Alan Stern
2011-08-30 18:45 ` Mark Salter
2011-08-30 18:45 ` Mark Salter
2011-08-30 17:26 ` Will Deacon
2011-08-30 17:26 ` Will Deacon
[not found] ` <20110830172642.GE3464-SGELLbQ0bobZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2011-08-30 17:48 ` Greg KH
2011-08-30 17:48 ` Greg KH
2011-08-30 17:54 ` Will Deacon
2011-08-30 17:54 ` Will Deacon
[not found] ` <20110830175432.GG3464-SGELLbQ0bobZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2011-08-31 0:23 ` Chen Peter-B29397
2011-08-31 0:23 ` Chen Peter-B29397
2011-08-31 8:49 ` Will Deacon
2011-08-31 8:49 ` Will Deacon
2011-08-31 12:33 ` Chen Peter-B29397
2011-08-31 12:33 ` Chen Peter-B29397
2011-08-31 13:43 ` Mark Salter
2011-08-31 13:43 ` Mark Salter
2011-08-31 15:21 ` Will Deacon
2011-08-31 15:21 ` Will Deacon
2011-08-31 15:27 ` Mark Salter
2011-08-31 15:27 ` Mark Salter
2011-08-31 16:12 ` Marc Zyngier
2011-08-31 16:12 ` Marc Zyngier
2011-08-31 16:55 ` Marc Dietrich
2011-08-31 16:55 ` Marc Dietrich
2011-09-01 10:34 ` Marc Zyngier
2011-09-01 10:34 ` Marc Zyngier
[not found] ` <4E5F5FA9.3010305-5wv7dgnIgG8@public.gmane.org>
2011-09-01 11:13 ` Marc Dietich
2011-09-01 11:13 ` Marc Dietich
2011-09-01 19:08 ` Stephen Warren
2011-09-01 19:08 ` Stephen Warren
2011-09-02 9:50 ` Marc Zyngier
2011-09-02 9:50 ` Marc Zyngier
2011-09-02 17:07 ` Stephen Warren [this message]
2011-09-02 17:07 ` Stephen Warren
[not found] ` <74CDBE0F657A3D45AFBB94109FB122FF04B327A383-C7FfzLzN0UxDw2glCA4ptUEOCMrvLtNR@public.gmane.org>
2011-09-02 11:13 ` Marc Dietich
2011-09-02 11:13 ` Marc Dietich
2011-08-31 17:46 ` Nicolas Pitre
2011-08-31 17:46 ` Nicolas Pitre
2011-08-31 17:51 ` Will Deacon
2011-08-31 17:51 ` Will Deacon
[not found] ` <20110831175147.GI8777-SGELLbQ0bobZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2011-08-31 18:19 ` Rob Herring
2011-08-31 18:19 ` Rob Herring
2011-08-31 18:35 ` Mark Salter
2011-08-31 18:35 ` Mark Salter
2011-08-31 18:49 ` Rob Herring
2011-08-31 18:49 ` Rob Herring
[not found] ` <4E5E8230.9060307-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-08-31 18:58 ` Mark Salter
2011-08-31 18:58 ` Mark Salter
2011-08-31 19:35 ` Will Deacon
2011-08-31 19:35 ` Will Deacon
2011-09-08 22:41 ` Mark Salter
2011-09-08 22:41 ` Mark Salter
[not found] ` <1315521779.2313.29.camel-PDpCo7skNiwAicBL8TP8PQ@public.gmane.org>
2011-10-31 6:49 ` Pandita, Vikram
2011-10-31 6:49 ` Pandita, Vikram
2011-08-31 0:56 ` Ming Lei
2011-08-31 0:56 ` Ming Lei
2011-09-01 23:16 ` Grant Grundler
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