Hi Kirill,
On Friday 22 July 2011 16:47:22 Kirill Smelkov wrote:
> [ Cc'ing Andrew Morton -- Andrew, could you please pick this patch, in
> case there is no response from maintainers again? Thanks beforehand. ]
>
>
> Hello up there,
>
> My first posting was 1 month ago, and a reminder ~ 2 weeks ago. All
> without a reply. v3.0 is out and they say the merge window will be
> shorter this time, so in oder not to miss it, I've decided to resend my
> patch on lowering USB periodic bandwidth allocation topic.
I'm very very sorry for missing the patch (and worse, twice :-/).
> Could this simple patch be please applied?
Yes it can. I see that Andrew already applied it to his tree. Mauro, should it
go through there, or through your tree ? I've pushed it to my tree at
git://linuxtv.org/pinchartl/uvcvideo.git uvcvideo-stable, so you can already
pull.
> Thanks,
> Kirill
>
>
> P.S.
>
> Referenced in the description cc62a7eb (USB: EHCI: Allow users to
> override 80% max periodic bandwidth) will be entering the mainline via
> Greg's usb tree.
>
> ---- 8< ----
> From: Kirill Smelkov <kirr@xxxxxxxxxx>
> Subject: [PATCH] uvcvideo: Add FIX_BANDWIDTH quirk to HP Webcam found on HP
> Mini 5103 netbook
>
> The camera there identifies itself as being manufactured by Cheng Uei
> Precision Industry Co., Ltd (Foxlink), and product is titled as "HP
> Webcam [2 MP Fixed]".
The device isn't listed in the supported devices list. Could you please send
me its lsusb -v output ?
> I was trying to get 2 USB video capture devices to work simultaneously,
> and noticed that the above mentioned webcam always requires packet size
> = 3072 bytes per micro frame (~= 23.4 MB/s isoc bandwidth), which is far
> more than enough to get standard NTSC 640x480x2x30 = ~17.6 MB/s isoc
> bandwidth.
>
> As there are alt interfaces with smaller MxPS
>
> T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
> D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
> P: Vendor=05c8 ProdID=0403 Rev= 1.06
> S: Manufacturer=Foxlink
> S: Product=HP Webcam [2 MP Fixed]
> S: SerialNumber=200909240102
> C:* #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA
> A: FirstIf#= 0 IfCount= 2 Cls=0e(video) Sub=03 Prot=00
> I:* If#= 0 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=00 Driver=uvcvideo
> E: Ad=83(I) Atr=03(Int.) MxPS= 16 Ivl=4ms
> I:* If#= 1 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> I: If#= 1 Alt= 1 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS= 128 Ivl=125us
> I: If#= 1 Alt= 2 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS= 512 Ivl=125us
> I: If#= 1 Alt= 3 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS=1024 Ivl=125us
> I: If#= 1 Alt= 4 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS=1536 Ivl=125us
> I: If#= 1 Alt= 5 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS=2048 Ivl=125us
> I: If#= 1 Alt= 6 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS=2688 Ivl=125us
> I: If#= 1 Alt= 7 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
> E: Ad=81(I) Atr=05(Isoc) MxPS=3072 Ivl=125us
>
> UVC_QUIRK_FIX_BANDWIDTH helps here and NTSC video can be served with
> MxPS=2688 i.e. 20.5 MB/s isoc bandwidth.
>
> In terms of microframe time allocation, before the quirk NTSC video
> required 60 usecs / microframe and 53 usecs / microframe after.
>
>
> P.S.
>
> Now with tweaked ehci-hcd to allow up to 90% isoc bandwidth (cc62a7eb
> "USB: EHCI: Allow users to override 80% max periodic bandwidth") I can
> capture two video sources -- PAL 720x576 YUV422 @25fps + NTSC 640x480
> YUV422 @30fps simultaneously. Hooray!
>
> Signed-off-by: Kirill Smelkov <kirr@xxxxxxxxxx>
Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/video/uvc/uvc_driver.c | 9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/media/video/uvc/uvc_driver.c
> b/drivers/media/video/uvc/uvc_driver.c index b6eae48..f633700 100644
> --- a/drivers/media/video/uvc/uvc_driver.c
> +++ b/drivers/media/video/uvc/uvc_driver.c
> @@ -2130,6 +2130,15 @@ static struct usb_device_id uvc_ids[] = {
> .bInterfaceProtocol = 0,
> .driver_info = UVC_QUIRK_PROBE_MINMAX
>
> | UVC_QUIRK_BUILTIN_ISIGHT },
>
> + /* Foxlink ("HP Webcam" on HP Mini 5103) */
> + { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
> + | USB_DEVICE_ID_MATCH_INT_INFO,
> + .idVendor = 0x05c8,
> + .idProduct = 0x0403,
> + .bInterfaceClass = USB_CLASS_VIDEO,
> + .bInterfaceSubClass = 1,
> + .bInterfaceProtocol = 0,
> + .driver_info = UVC_QUIRK_FIX_BANDWIDTH },
> /* Genesys Logic USB 2.0 PC Camera */
> { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
>
> | USB_DEVICE_ID_MATCH_INT_INFO,
--
Regards,
Laurent Pinchart
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