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    Subject[PATCH 4.14 053/237] pinctrl: baytrail: Do not clear IRQ flags on direct-irq enabled pins
    Date
    From: Hans de Goede <hdegoede@redhat.com>

    [ Upstream commit a23680594da7a9e2696dbcf4f023e9273e2fa40b ]

    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>
    ---
    drivers/pinctrl/intel/pinctrl-baytrail.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c
    index 9df5d29d708da..4fb3e44f91331 100644
    --- a/drivers/pinctrl/intel/pinctrl-baytrail.c
    +++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
    @@ -958,7 +958,13 @@ 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);
    }
    --
    2.20.1


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