Hi Terry, On 15/10/18 19:34, Terence Neill wrote:
Hi Felipe, I am having some issues when attempting to stream 1280x720 uncompressed video @ 10fps over a USB 2.0 High-Speed link. The system setup is: WebCam --- USB 2.0 link ---> x86 Linux Machine running uvc-gadget ---- USB 2.0 link ---> x86 Host Machine running Windows 10. When running this setup, I am experiencing the following: 1. With streaming_maxpacket set to 2048 (2 transactions per microframe) the video will stream for approximately one minute before terminating with "VS request completed with status -18" reported in the kernel logs. 2. With streaming_maxpacket set to 3072 (3 transactions per microframe) the video does not stream at all with "VS request completed with status -18" reported in the error logs.
There were some updates pushed recently to the uvc-gadget utility [1]. Could you please try with that and see if this issue still persists? Thanks. [1] http://git.ideasonboard.org/uvc-gadget.git
From trying to analyse what is going on (looking at traces), it looks like the dwc3 driver is initially forwarding video buffers as expected. Because the bandwdith of the USB link is greater than the bandiwidth of the video being transmitted, at some point the dwc3 driver looks for more buffers to transmit and there aren't any. At this point, it seems to enter a state that is not recovered from whenever a new buffer becomes available to transmit. I have included a trace and register dump as requested for further analysis. In terms of hardware/software versions for the test setup: Linux machine - Intel n4200 - running Ubuntu 18.04 - kernel version 4.19.0-041900rc8-generic (I updated to this version this morning to make sure I was using the latest dwc3 driver, the same problem exists (with a different error code -104) with the stock Ubuntu 18.04 kernel). Windows machine - Core i5-4570 - Windows 10 Enterprise. Any help with further investigation of this problem would be appreciated? Could this problem be caused by the configuration setup that I'm using for the uvc gadget? Thanks in advance for your help, Regards, Terry
cheers, -roger -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
