Re: [PATCH v3] misc/pca9552: Fix for pca9552 not getting reset

[Miles Glenn <milesg@linux.vnet.ibm.com>]

On Tue, 2023-10-10 at 21:58 +0200, Cédric Le Goater wrote:
> On 10/10/23 21:52, Glenn Miles wrote:
> > Testing of the pca9552 device on the powernv platform
> > showed that the reset method was not being called when
> > an instance of the device was realized.  This was causing
> > the INPUT0/INPUT1 POR values to be incorrect.
> > 
> > Fixed by overriding the parent pca955x_realize method with a
> > new pca9552_realize method which first calls
> > the parent pca955x_realize method followed by the
> > pca9552_reset function.
> > 
> > Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
> > ---
> 
> It is good practice to include a changelog after '---'

Ok, thanks.  I'll remember that for next time!

> 
> 
> >   hw/misc/pca9552.c | 7 +++++++
> >   1 file changed, 7 insertions(+)
> > 
> > diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c
> > index fff19e369a..4e183cc554 100644
> > --- a/hw/misc/pca9552.c
> > +++ b/hw/misc/pca9552.c
> > @@ -384,6 +384,12 @@ static void pca955x_realize(DeviceState *dev,
> > Error **errp)
> >       qdev_init_gpio_out(dev, s->gpio, k->pin_count);
> >   }
> >   
> > +static void pca9552_realize(DeviceState *dev, Error **errp)
> > +{
> > +    pca955x_realize(dev, errp);
> > +    pca9552_reset(dev);
> > +}
> 
> I don't see any change from v2.

The change from v2 can be seen below here where I added back the
line for setting the dc->reset method, which was removed in v2.

Perhaps I misunderstood what you meant by "You need both handlers, a
realize and a reset"?  You can see below that both the reset and the
realize methods are being initialized.  Are you taking issue with the
realize function calling the reset function?  I did this because in
my testing I noticed that reset was not getting called at any point.
Is the reset function supposed to get called automatically during
device realization?  It does not seem to be happening.

Thanks,

Glenn


> 
> Thanks,
> 
> C.
> 
> > +
> >   static Property pca955x_properties[] = {
> >       DEFINE_PROP_STRING("description", PCA955xState, description),
> >       DEFINE_PROP_END_OF_LIST(),
> > @@ -417,6 +423,7 @@ static void pca9552_class_init(ObjectClass *oc,
> > void *data)
> >       PCA955xClass *pc = PCA955X_CLASS(oc);
> >   
> >       dc->reset = pca9552_reset;
> > +    dc->realize = pca9552_realize;
> >       dc->vmsd = &pca9552_vmstate;
> >       pc->max_reg = PCA9552_LS3;
> >       pc->pin_count = 16;