diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2019-12-28 00:04:47 +0100 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-01-09 12:11:17 +0100 |
| commit | a23680594da7a9e2696dbcf4f023e9273e2fa40b (patch) | |
| tree | 62dd72caff10598e6c3f2e697a6f6c1ea391e1a0 /drivers/pinctrl | |
| parent | pinctrl: sunrisepoint: Add missing Interrupt Status register offset (diff) | |
| download | linux-a23680594da7a9e2696dbcf4f023e9273e2fa40b.tar.xz linux-a23680594da7a9e2696dbcf4f023e9273e2fa40b.zip | |
pinctrl: baytrail: Do not clear IRQ flags on direct-irq enabled pins
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>
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-baytrail.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c index cb0c04c5269c..394d9cc38cc2 100644 --- a/drivers/pinctrl/intel/pinctrl-baytrail.c +++ b/drivers/pinctrl/intel/pinctrl-baytrail.c @@ -742,7 +742,13 @@ static void byt_gpio_clear_triggering(struct intel_pinctrl *vg, unsigned int off 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); } |