Hi, "Chow, Watson" <Watson.Chow@xxxxxxxxx> writes: >>>>> 3. You suggest me to try on kernel v5.12 or the latest v5.13-rc. It looks not >>>>> easy in my side to upgrade the kernel version. It would affect those other >>>>> device drivers I'm currently using. So, do you think there's any short cut >>>>> to fix this problem under my current kernel version - v5.4? >>>> >>>>In that case, you need to ask for support from whoever forces you to >>>>stay with such an old kernel. I believe that would be Xilinx. >>> >>> I have a thought to back port those changes around the dwc3 and gadget driver >>> from the latest kernel version to my kernel (v5.4). Do you think this is >>> feasible? >> >>should be, but it's likely quite a bit of work: >> >>$ git rev-list --count v5.4..linus/master -- drivers/usb/dwc3/ >>257 >> > > Upgraded the kernel version to 5.9, I can set the g_webcam module pararmeters > as follow (for max bandwidth): > > streaming_maxpacket=3072 > streaming_maxburst=15 > streaming_interval=1 > > Data transfer with above setting is working now - tested with dummy data > generator in the uvc-gadget app. > > This concludes that kernel 5.4 is too old for DWC3 and UVC gadget driver > in high bandwidth usage Cool, thanks for letting me know :-) -- balbi
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