linux-kernel - Re: uvcvideo causes ehci

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Date:	Fri, 23 Oct 2009 10:18:47 +0300
From:	Ozan Çağlayan <ozan@...dus.org.tr>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: uvcvideo causes ehci_hcd to halt

Alan Stern wrote On 22-10-2009 17:05:
> On Thu, 22 Oct 2009, [UTF-8] Ozan Ã‡aÄŸlayan wrote:
>
>   
>> Here's the outputs from /sys/kernel/debug/usb/ehci:
>>
>> periodic:
>> ----------------
>> size = 1024
>>    1:  qh1024-0001/f6ffe280 (h2 ep2 [1/0] q0 p8)
>>     
>
> There's something odd about this.  I'd like to see this file again, 
> after the patch below has been applied.
>   

periodic
size = 1024
   1:  qh1024-0001/f6ffe280 (h2 ep2 [1/0] q0 p8) t00000000

registers
bus pci, device 0000:00:1d.7
EHCI Host Controller
EHCI 1.00, hcd state 0
ownership 00000001
SMI sts/enable 0x80080000
structural params 0x00104208
capability params 0x00016871
status 6008 Periodic Recl FLR
command 010000 (park)=0 ithresh=1 period=1024 HALT
intrenable 00
uframe 0677
port 1 status 001000 POWER sig=se0
port 2 status 001000 POWER sig=se0
port 3 status 001000 POWER sig=se0
port 4 status 001000 POWER sig=se0
port 5 status 001005 POWER sig=se0 PE CONNECT
port 6 status 001005 POWER sig=se0 PE CONNECT
port 7 status 001000 POWER sig=se0
port 8 status 001000 POWER sig=se0
irq normal 60 err 0 reclaim 14 (lost 0)
complete 60 unlink 1

After putting a udelay() the problem seems to be resolved. I did a
rmmod-modprobe-sleep in 50 iterations,  and the host controller was
still functional along with the web-cam:

periodic
size = 1024

registers
bus pci, device 0000:00:1d.7
EHCI Host Controller
EHCI 1.00, hcd state 1
ownership 00000001
SMI sts/enable 0x80080000
structural params 0x00104208
capability params 0x00016871
status 2008 Recl FLR
command 010001 (park)=0 ithresh=1 period=1024 RUN
intrenable 37 IAA FATAL PCD ERR INT
uframe 0908
port 1 status 001000 POWER sig=se0
port 2 status 001000 POWER sig=se0
port 3 status 001000 POWER sig=se0
port 4 status 001000 POWER sig=se0
port 5 status 001005 POWER sig=se0 PE CONNECT
port 6 status 001005 POWER sig=se0 PE CONNECT
port 7 status 001000 POWER sig=se0
port 8 status 001000 POWER sig=se0
irq normal 2115 err 0 reclaim 300 (lost 0)
complete 2110 unlink 8

--
Thanks a lot for all your efforts!
--
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