linux-kernel - [PATCH] Re: uvcvideo: Finally fix Logitech Quickcam for Notebooks Pro

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Date:	Wed, 7 Oct 2009 14:59:40 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	laurent.pinchart@...net.be
Cc:	linux-uvc-devel@...ts.berlios.de, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Re: uvcvideo: Finally fix Logitech Quickcam for Notebooks Pro

On Tuesday 06 October 2009, Ondrej Zary wrote:
> Hello,
> I have a Logitech Quickcam for Notebooks Pro camera (046d:08c3) which just
> does not work even with kernel 2.6.31 and has never worked well before.
>
> On http://linux-uvc.berlios.de/, there are two problems listed. I want to
> really fix these two problems so the camera will just work after plugging
> in (and not disconnect). I started with problem no. 2 as this causes the
> camera not to work at all when plugged in:
>
> usb 5-2.4: new high speed USB device using ehci_hcd and address 7
> usb 5-2.4: configuration #1 chosen from 1 choice
> uvcvideo: Found UVC 1.00 device <unnamed> (046d:08c3)
> uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling
> workaround.
> uvcvideo: Failed to query (129) UVC probe control : -110 (exp. 26).
> uvcvideo: Failed to initialize the device (-5).
>
> When I do "modprobe snd_usb_audio", then "rmmod snd_usb_audio" and
> finally "modprobe uvcvideo", it works. So it looks like snd_usb_audio does
> some initialization that allows uvcvideo to work. It didn't work at all I
> didn't have snd_usb_audio module compiled.
>
> What was the change that supposedly broke this in 2.6.22?

I discovered that it's not related to usb audio at all. Doing "rmmod uvcvideo"
and "modprobe uvcvideo" repeatedly succeeded after a couple of tries. Increasing
UVC_CTRL_STREAMING_TIMEOUT to 3000 helped (2000 was not enough).


Increase UVC_CTRL_STREAMING_TIMEOUT to fix initialization of
Logitech Quickcam for Notebooks Pro.
This fixes following error messages:
uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
uvcvideo: Failed to query (129) UVC probe control : -110 (exp. 26).
uvcvideo: Failed to initialize the device (-5).

Signed-off-by: Ondrej Zary <linux@...nbow-software.org>

--- linux-2.6.31-orig/drivers/media/video/uvc/uvcvideo.h	2009-09-10 00:13:59.000000000 +0200
+++ linux-2.6.31/drivers/media/video/uvc/uvcvideo.h	2009-10-07 13:47:27.000000000 +0200
@@ -304,7 +304,7 @@
 #define UVC_MAX_STATUS_SIZE	16
 
 #define UVC_CTRL_CONTROL_TIMEOUT	300
-#define UVC_CTRL_STREAMING_TIMEOUT	1000
+#define UVC_CTRL_STREAMING_TIMEOUT	3000
 
 /* Devices quirks */
 #define UVC_QUIRK_STATUS_INTERVAL	0x00000001


-- 
Ondrej Zary
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