[PATCH] usb: musb-new: Extend Allwinner quirk to newer SoCs

[Andre Przywara]

On Tue, 27 Apr 2021 02:37:20 +0200
Marek Vasut <marex at denx.de> wrote:

Hi,

> On 4/27/21 2:03 AM, Andre Przywara wrote:
> > As the comment in musb_regs.h describes, Allwinner saves the
> > MUSB_CONFIGDATA register, which always return 0 on those SoCs.
> > 
> > This is also true for the H6 and H616, so extend the quirk to those
> > controllers as well.
> > 
> > This fixes USB peripheral mode on H6 and H616 boards.
> > 
> > Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> > ---
> >   drivers/usb/musb-new/musb_regs.h | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/musb-new/musb_regs.h b/drivers/usb/musb-new/musb_regs.h
> > index c4d7203b851..bee1b715a95 100644
> > --- a/drivers/usb/musb-new/musb_regs.h
> > +++ b/drivers/usb/musb-new/musb_regs.h
> > @@ -432,7 +432,8 @@ static inline u8 musb_read_ulpi_buscontrol(void __iomem *mbase)
> >   static inline u8 musb_read_configdata(void __iomem *mbase)
> >   {
> >   #if defined CONFIG_MACH_SUN8I_A33 || defined CONFIG_MACH_SUN8I_A83T || \
> > -		defined CONFIG_MACH_SUNXI_H3_H5 || defined CONFIG_MACH_SUN50I
> > +	defined CONFIG_MACH_SUNXI_H3_H5 || defined CONFIG_MACH_SUN50I || \
> > +	defined CONFIG_SUN50I_GEN_H6  
> 
> Isn't there some better solution then ever-growing list of macros to 
> check, like e.g. a single CONFIG_MACH_SUNXI ?

I was wondering the same, but I think this does not apply to the older
SoCs (we use ARCH_SUNXI in the two functions above and below, so I
guess the differentiation here is deliberate). I will test this later.

So we could probably use the quirk also for the older, working(?) SoCs,
but I am not sure we should do that. CONFIG_SUN50I_GEN_H6 is already a
symbol covering multiple SoCs, so ideally we won't need to add many
more.
I can have a look if we have other checks like that in the code, then
maybe define a collective symbol for newer SoCs?

Cheers,
Andre