On Mon, 2021-01-25 at 11:24 +0800, Nicolas Boichat wrote:
> On Mon, Jan 25, 2021 at 11:15 AM Hailong Fan <hailong....@mediatek.com> wrote:
> >
> > When flipping the polarity will be generated interrupt under certain
> > circumstances, but GPIO external signal has not changed.
> > Then, mask the interrupt before polarity setting, and clear the
> > unexpected interrupt after trigger type setting completed.
>
> I'd add a short note about why you remove mtk_eint_flip_edge, that is,
> because mtk_eint_unmask already calls it.
Add it on V3, thx.
> >
> > Signed-off-by: Hailong Fan <hailong....@mediatek.com>
> > ---
> > [V2]
> > ---
> > drivers/pinctrl/mediatek/mtk-eint.c | 13 +++++++++++--
> > 1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pinctrl/mediatek/mtk-eint.c
> > b/drivers/pinctrl/mediatek/mtk-eint.c
> > index 22736f60c16c..0042f32c7e7e 100644
> > --- a/drivers/pinctrl/mediatek/mtk-eint.c
> > +++ b/drivers/pinctrl/mediatek/mtk-eint.c
> > @@ -157,6 +157,7 @@ static void mtk_eint_ack(struct irq_data *d)
> > static int mtk_eint_set_type(struct irq_data *d, unsigned int type)
> > {
> > struct mtk_eint *eint = irq_data_get_irq_chip_data(d);
> > + bool unmasked;
>
> Well, this is true if the interrupt has been masked (or, equivalently,
> if we need to unmask it later).
>
> So I think either "masked" or "unmask" are better as variable names.
Yes, masked is better.
>
> > u32 mask = BIT(d->hwirq & 0x1f);
> > void __iomem *reg;
> >
> > @@ -173,6 +174,13 @@ static int mtk_eint_set_type(struct irq_data *d,
> > unsigned int type)
> > else
> > eint->dual_edge[d->hwirq] = 0;
> >
> > + if (!mtk_eint_get_mask(eint, d->hwirq)) {
> > + mtk_eint_mask(d);
> > + unmasked = true;
> > + } else {
> > + unmasked = false;
> > + }
> > +
> > if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) {
> > reg = mtk_eint_get_offset(eint, d->hwirq,
> > eint->regs->pol_clr);
> > writel(mask, reg);
> > @@ -189,8 +197,9 @@ static int mtk_eint_set_type(struct irq_data *d,
> > unsigned int type)
> > writel(mask, reg);
> > }
> >
> > - if (eint->dual_edge[d->hwirq])
> > - mtk_eint_flip_edge(eint, d->hwirq);
> > + mtk_eint_ack(d);
> > + if (unmasked)
> > + mtk_eint_unmask(d);
> >
> > return 0;
> > }
> > --
> > 2.18.0
