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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>
5.4-rM2-2.2.x-imx-squashed
Hans de Goede 2019-12-28 00:04:47 +01:00 committed by Greg Kroah-Hartman
parent 9ad79d4fa0
commit 04a5bebd77
1 changed files with 7 additions and 1 deletions
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8
drivers/pinctrl/intel/pinctrl-baytrail.c
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@ -752,7 +752,13 @@ static void byt_gpio_clear_triggering(struct byt_gpio *vg, unsigned int offset)
raw_spin_lock_irqsave(&byt_lock, flags);
value = readl(reg);
value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL);
/* Do not clear direct-irq enabled IRQs (from gpio_disable_free) */
if (value & BYT_DIRECT_IRQ_EN)
/* nothing to do */ ;
else
value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL);
writel(value, reg);
raw_spin_unlock_irqrestore(&byt_lock, flags);
}