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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Hans de Goede <hdegoede@redhat.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-gpio@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 053/459] pinctrl: baytrail: Do not clear IRQ flags on direct-irq enabled pins
Date: Fri, 14 Feb 2020 10:55:03 -0500
Message-ID: <20200214160149.11681-53-sashal@kernel.org> (raw)
In-Reply-To: <20200214160149.11681-1-sashal@kernel.org>

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 7d658e6627e7a..606fe216f902a 100644
--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -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);
 }
-- 
2.20.1


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214160149.11681-1-sashal@kernel.org>
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 024/459] pinctrl: sh-pfc: r8a77965: Fix DU_DOTCLKIN3 drive/bias control Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 029/459] pinctrl: sh-pfc: sh7264: Fix CAN function GPIOs Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 044/459] gpio: gpio-grgpio: fix possible sleep-in-atomic-context bugs in grgpio_irq_map/unmap() Sasha Levin
2020-02-14 15:55 ` Sasha Levin [this message]
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 235/459] pinctrl: sh-pfc: r8a7778: Fix duplicate SDSELF_B and SD1_CLK_B Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 236/459] pinctrl: sh-pfc: sh7269: Fix CAN function GPIOs Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 315/459] gpiolib: Set lockdep class for hierarchical irq domains Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 332/459] gpio: Fix the no return statement warning Sasha Levin
2020-02-15  0:46   ` Kevin Hao

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