linux-kernel - Re: [PATCH 2/3] pinctrl: single: fix pcs_disable with bits_per

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Date:	Sat, 30 Nov 2013 09:24:19 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] pinctrl: single: fix pcs_disable with bits_per_mux

* Tony Lindgren <tony@...mide.com> [131130 09:08]:
> * Peter Ujfalusi <peter.ujfalusi@...com> [131128 04:01]:
> > On 11/28/2013 01:29 PM, Tomi Valkeinen wrote:
> > > pcs_enable() uses vals->mask instead of pcs->fmask when bits_per_mux is
> > > enabled. However, pcs_disable() always uses pcs->fmask.
> > > 
> > > Fix pcs_disable() to use vals->mask with bits_per_mux.
> > 
> > I wonder how did I missed this?
> 
> Probably because the disable can be a nop for some hardware.
> 
> > Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>

Linus W, might be worth also mentioning the regression causing commit
here. Commit 9e605cb68a21d5 (pinctrl: pinctrl-single: Add
pinctrl-single,bits type of mux) added support for multiple muxes
in a single register, but forgot to modify pcs_disable() function the
same way as pcs_enable() was modified.
 
> Acked-by: Tony Lindgren <tony@...mide.com>
>  
>  
> > > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
> > > ---
> > >  drivers/pinctrl/pinctrl-single.c | 10 ++++++++--
> > >  1 file changed, 8 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
> > > index 829b98c5c66f..174f4c50cd77 100644
> > > --- a/drivers/pinctrl/pinctrl-single.c
> > > +++ b/drivers/pinctrl/pinctrl-single.c
> > > @@ -525,12 +525,18 @@ static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
> > >  	for (i = 0; i < func->nvals; i++) {
> > >  		struct pcs_func_vals *vals;
> > >  		unsigned long flags;
> > > -		unsigned val;
> > > +		unsigned val, mask;
> > >  
> > >  		vals = &func->vals[i];
> > >  		raw_spin_lock_irqsave(&pcs->lock, flags);
> > >  		val = pcs->read(vals->reg);
> > > -		val &= ~pcs->fmask;
> > > +
> > > +		if (pcs->bits_per_mux)
> > > +			mask = vals->mask;
> > > +		else
> > > +			mask = pcs->fmask;
> > > +
> > > +		val &= ~mask;
> > >  		val |= pcs->foff << pcs->fshift;
> > >  		pcs->write(val, vals->reg);
> > >  		raw_spin_unlock_irqrestore(&pcs->lock, flags);
> > > 
> > 
> > 
> > -- 
> > Péter
> --
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