On Wed, Mar 31, 2010 at 05:09:41AM +0000, Michael Lorenz wrote:
> Module Name: src
> Committed By: macallan
> Date: Wed Mar 31 05:09:41 UTC 2010
>
> Modified Files:
> src/sys/dev/ic: pcf8584.c
>
> Log Message:
> Do as OpenSolaris does and read the status register after each write.
> Now this driver works on my Blade 2500.
void
pcfiic_write(struct pcfiic_softc *sc, bus_size_t r, u_int8_t v)
{
+ volatile uint8_t junk;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, sc->sc_regmap[r], v);
+ junk = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCF_S1);
bus_space_barrier(sc->sc_iot, sc->sc_ioh, sc->sc_regmap[r], 1,
BUS_SPACE_BARRIER_WRITE);
}
I wonder, does the device need the read, or is the bus_space_barrier()
insufficient to flush the write to the device?
Dave
--
David Young OJC Technologies
dyo...@ojctech.com Urbana, IL * (217) 278-3933
