pinctrl: baytrail: Do not clear IRQ flags on direct-irq enabled pins
[ Upstream commit a23680594d
]
Suspending Goodix touchscreens requires changing the interrupt pin to
output before sending them a power-down command. Followed by wiggling
the interrupt pin to wake the device up, after which it is put back
in input mode.
On Bay Trail devices with a Goodix touchscreen direct-irq mode is used
in combination with listing the pin as a normal GpioIo resource.
This works fine, until the goodix driver gets rmmod-ed and then insmod-ed
again. In this case byt_gpio_disable_free() calls
byt_gpio_clear_triggering() which clears the IRQ flags and after that the
(direct) IRQ no longer triggers.
This commit fixes this by adding a check for the BYT_DIRECT_IRQ_EN flag
to byt_gpio_clear_triggering().
Note that byt_gpio_clear_triggering() only gets called from
byt_gpio_disable_free() for direct-irq enabled pins, as these are excluded
from the irq_valid mask by byt_init_irq_valid_mask().
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -752,7 +752,13 @@ static void byt_gpio_clear_triggering(struct byt_gpio *vg, unsigned int offset)
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raw_spin_lock_irqsave(&byt_lock, flags);
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value = readl(reg);
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value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL);
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/* Do not clear direct-irq enabled IRQs (from gpio_disable_free) */
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if (value & BYT_DIRECT_IRQ_EN)
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/* nothing to do */ ;
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else
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value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL);
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writel(value, reg);
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raw_spin_unlock_irqrestore(&byt_lock, flags);
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}
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