pinctrl: mediatek: Ignore interrupts that are wake only during resume

Before suspending, mtk-eint would set the interrupt mask to the
one in wake_mask. However, some of these interrupts may not have a
corresponding interrupt handler, or the interrupt may be disabled.

On resume, the eint irq handler would trigger nevertheless,
and irq/pm.c:irq_pm_check_wakeup would be called, which would
try to call irq_disable. However, if the interrupt is not enabled
(irqd_irq_disabled(&desc->irq_data) is true), the call does nothing,
and the interrupt is left enabled in the eint driver.

Especially for level-sensitive interrupts, this will lead to an
interrupt storm on resume.

If we detect that an interrupt is only in wake_mask, but not in
cur_mask, we can just mask it out immediately (as mtk_eint_resume
would do anyway at a later stage in the resume sequence, when
restoring cur_mask).

Fixes: bf22ff45bed6 ("genirq: Avoid unnecessary low level irq function calls")
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Acked-by: Sean Wang <sean.wang@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/pinctrl/mediatek/mtk-eint.c b/drivers/pinctrl/mediatek/mtk-eint.c
index f464f8cd274b..737385e86beb 100644
--- a/drivers/pinctrl/mediatek/mtk-eint.c
+++ b/drivers/pinctrl/mediatek/mtk-eint.c
@@ -318,7 +318,7 @@ static void mtk_eint_irq_handler(struct irq_desc *desc)
         struct irq_chip *chip = irq_desc_get_chip(desc);
         struct mtk_eint *eint = irq_desc_get_handler_data(desc);
         unsigned int status, eint_num;
-        int offset, index, virq;
+        int offset, mask_offset, index, virq;
         void __iomem *reg =  mtk_eint_get_offset(eint, 0, eint->regs->stat);
         int dual_edge, start_level, curr_level;
 
@@ -328,10 +328,24 @@ static void mtk_eint_irq_handler(struct irq_desc *desc)
                 status = readl(reg);
                 while (status) {
                         offset = __ffs(status);
+                        mask_offset = eint_num >> 5;
                         index = eint_num + offset;
                         virq = irq_find_mapping(eint->domain, index);
                         status &= ~BIT(offset);
 
+                        /*
+                         * If we get an interrupt on pin that was only required
+                         * for wake (but no real interrupt requested), mask the
+                         * interrupt (as would mtk_eint_resume do anyway later
+                         * in the resume sequence).
+                         */
+                        if (eint->wake_mask[mask_offset] & BIT(offset) &&
+                            !(eint->cur_mask[mask_offset] & BIT(offset))) {
+                                writel_relaxed(BIT(offset), reg -
+                                        eint->regs->stat +
+                                        eint->regs->mask_set);
+                        }
+
                         dual_edge = eint->dual_edge[index];
                         if (dual_edge) {
                                 /*