diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2019-12-28 00:04:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-24 08:34:36 +0100 |
| commit | 0a8a859fdb75624c39d56115dcd0f32ca789f22c (patch) | |
| tree | ccb6f7297338996cb020aaecd23523d82f006ab8 /drivers/pinctrl/intel | |
| parent | 47505a7debe76f07c81071c009f2c05bb7f99959 (diff) | |
| download | linux-rt-0a8a859fdb75624c39d56115dcd0f32ca789f22c.tar.gz | |
pinctrl: baytrail: Do not clear IRQ flags on direct-irq enabled pins
[ 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>
Diffstat (limited to 'drivers/pinctrl/intel')
| -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 021e28ff1194..a760d8bda0af 100644 --- a/drivers/pinctrl/intel/pinctrl-baytrail.c +++ b/drivers/pinctrl/intel/pinctrl-baytrail.c @@ -950,7 +950,13 @@ 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); } |