Hi Boris,

On Tuesday, August 7, 2018 8:57:52 PM CEST Boris Brezillon wrote:

On Tue,  7 Aug 2018 00:29:13 +0200
Janusz Krzysztofik [off-list ref] wrote:

quoted

In its current shape, the driver sets data port direction before each
byte read/write operation, even during multi-byte transfers.  Since
performance of the driver is completely not acceptable on Amstrad Delta
after it has been converted to GPIO bitbang, try to improve things a
bit by setting the port direction only on first byte of each transfer.

...
I'd suggest a slightly different approach where the data pins
direction state is stored in the the priv struct and only changed when
required. This way you just have to add a test in
ams_delta_read/write_byte().

Good idea, I'm going to use it, thanks.

Once done, may I also move that one earlier in the series so that it can be 
applied while our discussion on GPIO bitmap changes still continues?

Thanks,
Janusz