From d2b3c353595a855794f8b9df5b5bdbe8deb0c413 Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Mon, 4 Dec 2017 12:11:02 +0300
Subject: [PATCH] pinctrl: cherryview: Mask all interrupts on Intel_Strago based systems
Git-commit: d2b3c353595a855794f8b9df5b5bdbe8deb0c413
Patch-mainline: v4.15-rc5
References: bsc#1051510
Guenter Roeck reported an interrupt storm on a prototype system which is
based on Cyan Chromebook. The root cause turned out to be a incorrectly
configured pin that triggers spurious interrupts. This will be fixed in
coreboot but currently we need to prevent the interrupt storm from
happening by masking all interrupts (but not GPEs) on those systems.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=197953
Fixes: bcb48cca23ec ("pinctrl: cherryview: Do not mask all interrupts in probe")
Reported-and-tested-by: Guenter Roeck <linux@roeck-us.net>
Reported-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pinctrl/intel/pinctrl-cherryview.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/drivers/pinctrl/intel/pinctrl-cherryview.c
+++ b/drivers/pinctrl/intel/pinctrl-cherryview.c
@@ -1619,6 +1619,22 @@ static int chv_gpio_probe(struct chv_pin
clear_bit(i, chip->irq_valid_mask);
}
+ /*
+ * The same set of machines in chv_no_valid_mask[] have incorrectly
+ * configured GPIOs that generate spurious interrupts so we use
+ * this same list to apply another quirk for them.
+ *
+ * See also https://bugzilla.kernel.org/show_bug.cgi?id=197953.
+ */
+ if (!need_valid_mask) {
+ /*
+ * Mask all interrupts the community is able to generate
+ * but leave the ones that can only generate GPEs unmasked.
+ */
+ chv_writel(GENMASK(31, pctrl->community->nirqs),
+ pctrl->regs + CHV_INTMASK);
+ }
+
/* Clear all interrupts */
chv_writel(0xffff, pctrl->regs + CHV_INTSTAT);