On Thu, 16 Jul 2020 23:15:16 +0200, Olivia Mackintosh wrote: > > Hello, > > I am trying to add a device quirk for the Pioneer DJM-750 mixer. I have > attached a patch to illustrate what I'm trying to achieve. It is nearly > identical to https://patchwork.kernel.org/patch/11521019/ except for the > differences in channels. I have verified the settings against valid USB > transfers. > > While observing behaviour with a Windows 10 VM, the 8 pieces of data > appear to be 8 isochronous packets within a single frame as opposed to 8 > microframes (each with their own transfer). Should this have any impact > on the ability for the device to function? If so, is there a setting I > am missing to account for this? Or, am I simply clutching at straws and > completely on the wrong path. It's rather a generic USB-audio issue, not specific to your device, about how to set up URBs. This influences on the performance, yes; it defines stability vs latency. On Linux driver, the condition varies depending on the hw_params. > This is rather device specific so I would not expect anyone to help > troubleshoot this specific device but what I suspect is the problem is > the way the audio data is arranged in the transfer. > > Any suggestions and pointers on how to proceed are very much > appreciated. So did you see any actual problem with your patch? thanks, Takashi
