CVS commit: src/sys/dev/sbus

["Michael Lorenz" <macallan%netbsd.org@localhost>]

Module Name:    src
Committed By:   macallan
Date:           Wed Jun 28 11:08:47 UTC 2023

Modified Files:
        src/sys/dev/sbus: mgx.c

Log Message:
following a hunch...
- cache DEC and FG registers, only write them if the value actually changes
- wait for the engine to go idle before writing DEC
- wait for FIFO slots on everything else
with this we avoid waiting if possible and still avoid overlapping blit and
fill commands


To generate a diff of this commit:
cvs rdiff -u -r1.22 -r1.23 src/sys/dev/sbus/mgx.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.