Re: [PATCH 09/15] ASoC: SDCA: Add UMP buffer helper functions

[Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>]

> Yeah mainly my question was that it says "wait until" but I have
> never been able to define what that wait is. One possible
> interpretation is as soon as you see the device not requesting
> FDL you can progress, but perhaps a safer interpretation is if
> you see X milliseconds without an FDL request you can progress
> which is what we have gone with in the code for now. Was really
> just hoping you were going to be like "you also missed this other
> useful DisCo property" :-)

I don't think DisCo defined anything related to FDL. 

The only thing I see in the spec are Device-initiated status changes, i.e. the loops would look like

do {
	do {
		send_chunk()
		wait for FDLD_Chunk_OK();
	} while (!FDLD_File_OK)
	get_next file();
} while (!FDLD_Complete or !FDLD_Request_Reset) {

BTW, FDLD_Request_Reset (bxxx1Rxxx) and FDLD_Need_Reset (b0001r000) are probably the same concept using different names, not sure if this was clarified in a edit.

Like you said this can probably be discussed in a follow-up thread, it'll take time to limit and adjust the many degrees of freedom in the spec to what vendors actually implemented :-)