On Sat, Mar 03, 2018 at 10:24:24PM +0000, Sasha Levin wrote:

> We need to make sure that only proper channel slots (in SACCST register)
> are enabled at playback start time since some AC'97 CODECs (like VT1613 on
> UDOO board) were observed requesting via SLOTREQ spurious ones just after
> an AC'97 link is started but before the CODEC is configured by its driver.

This was part of a wider AC'97 rework IIRC and I'm very suspicious of
backporting it independently.