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pinctrl: single: Fix missing flush of posted write for a wakeirq

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With many repeated suspend resume cycles, the pin specific wakeirq
may not always work on omaps. This is because the write to enable the
pin interrupt may not have reached the device over the interconnect
before suspend happens.

Let's fix the issue with a flush of posted write with a readback.

Cc: [email protected]
Reported-by: Nishanth Menon <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Tony Lindgren 2016-05-31 14:17:06 -07:00 • committed by Linus Walleij
commit 0ac3c0a402
1 changed files with 3 additions and 0 deletions
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3
drivers/pinctrl/pinctrl-single.c
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@ -1580,6 +1580,9 @@ static inline void pcs_irq_set(struct pcs_soc_data *pcs_soc,
else
mask &= ~soc_mask;
pcs->write(mask, pcswi->reg);
/* flush posted write */
mask = pcs->read(pcswi->reg);
raw_spin_unlock(&pcs->lock);
}