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Re: CVS commit: src/sys/dev/ic
On Wed, Mar 31, 2010 at 09:45:40AM -0500, David Young wrote:
> 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.
> 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,
> I wonder, does the device need the read, or is the bus_space_barrier()
> insufficient to flush the write to the device?
Additionally, should this read not be after the barrier?
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