On 01-02-21, 10:29, Pierre-Louis Bossart wrote:
>
> > > * Set SCP_INT1_MASK register, typically bus clash and
> > > diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
> > > index f7ba1a77a1df..c1fdc85d0a74 100644
> > > --- a/drivers/soundwire/intel.c
> > > +++ b/drivers/soundwire/intel.c
> > > @@ -1286,7 +1286,8 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus)
> > > if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
> > > prop->hw_disabled = true;
> > > - prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH;
> > > + prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
> > > + SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
> >
> > move this to intel patch please..
> >
> > > return 0;
> > > }
> > > diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
> > > index a2766c3b603d..30415354d419 100644
> > > --- a/include/linux/soundwire/sdw.h
> > > +++ b/include/linux/soundwire/sdw.h
> > > @@ -426,6 +426,7 @@ struct sdw_master_prop {
> > > };
> > > #define SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH BIT(0)
> > > +#define SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY BIT(1)
> >
> > Why not add this quirk in patch 1..?
>
> There is an element of history here. We first found out about the bus clash
> on multiple devices and dealt with a specific bug number. Then we spend
> weeks on the parity issue on a new platform and ultimately showed we needed
> a similar work-around.
>
> All these problems are not typical from a user perspective; they appear when
> loading/unloading modules in loops, at some point it seems some hardware
> devices don't always reset properly or there's something problematic in
> power delivery.
>
> I don't think it's an issue if we refactor the code to add the quirks first,
> and add the intel.c patches later. We probably want 2 intel changes to keep
> the references to the bugs though and the detailed explanations.
Yes I would like to see that. Explanations are always welcome including
development/debug notes.. Changelogs are very important documentation for
kernel, so relevant details are always good to add.
>
> > Also add comments about each quirk, hopefully it wont be a big table
>
> Sounds fine.
--
~Vinod
