[PATCH V3] pinctrl: mediatek: Fix trigger type setting follow for unexpected interrupt

[Hailong Fan]

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.

Remove mtk_eint_flip_edge: because mtk_eint_unmask already calls it.

Signed-off-by: Hailong Fan <hailong....@mediatek.com>
Reviewed-by: Nicolas Boichat <drink...@chromium.org>
---
 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..3b9b5dbd7968 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 masked;
        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);
+               masked = false;
+       } else {
+               masked = true;
+       }
+
        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 (!masked)
+               mtk_eint_unmask(d);
 
        return 0;
 }
-- 
2.18.0