On Fri, May 15, 2020 at 01:47:42PM +0300, Serge Semin wrote:

If DMAC register is left uncleared any further DMAless transfers
may cause the DMAC hardware handshaking interface getting activated.

This and patch 4 look good as is but they don't apply against for-5.7
due to context changes in -next, unfortunately everyone seems to have
decided that now is the time to start working on this driver which makes
combinations of new work and fixes awkward.  I'm going to apply these
for 5.8 but it'd be good if you could send versions based on for-5.7 as
well so I can apply there - I can sort out the conflicts with 5.8.