From a23680594da7a9e2696dbcf4f023e9273e2fa40b Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Sat, 28 Dec 2019 00:04:47 +0100
Subject: [PATCH] pinctrl: baytrail: Do not clear IRQ flags on direct-irq enabled pins
Git-commit: a23680594da7a9e2696dbcf4f023e9273e2fa40b
Patch-mainline: v5.6-rc1
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pinctrl/intel/pinctrl-baytrail.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -957,7 +957,13 @@ static void byt_gpio_clear_triggering(st
raw_spin_lock_irqsave(&vg->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(&vg->lock, flags);
}