On Sat, Feb 14, 2009 at 08:16:45PM +0000, Adrian McMenamin wrote:

On Sat, 2009-02-14 at 20:06 +0000, Adrian McMenamin wrote:

quoted

Greg,

This patch updates the maple bus to support asynchronous block reads and
writes as well as generally improving the quality of the code and
supporting concurrency (all needed to support the Dreamcast visual
memory unit - a driver will also be posted for that).

I have posted versions of this before but am here following the patch
grouping suggested and have also tested this code and unlike earlier
versions it shows no signs of suffering from race conditions - so I hope
you will be happy to queue it for inclusion.

Changes in the bus driver necessitate some changes in the two maple bus
input drivers that are currently in mainline.

(Maple is SEGA's proprietary serial bus for the Dreamcast. It is capable
of comm speeds of up to 2Mbs.)

As well as supporting block reads and writes this code clean up removes
some poor handling of locks, uses an atomic status variable to serialise
access to devices and more robusly handles the general performance
problems of the bus.

Apologies, some of the VMU patch slipped into that. Here is a completely
clean version.

Signed-off-by: Adrian McMenamin <redacted>

Applied, thanks.