Patch "pinctrl: intel: Only restore pins that are used by the driver" has been added to the 4.4-stable tree

Patch "pinctrl: intel: Only restore pins that are used by the driver" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    pinctrl: intel: Only restore pins that are used by the driver

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pinctrl-intel-only-restore-pins-that-are-used-by-the-driver.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c538b9436751a0be2e1246b48353bc23156bdbcc Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Mon, 10 Oct 2016 16:39:31 +0300
Subject: pinctrl: intel: Only restore pins that are used by the driver

From: Mika Westerberg <mika.westerberg@linux.intel.com>

commit c538b9436751a0be2e1246b48353bc23156bdbcc upstream.

Dell XPS 13 (and maybe some others) uses a GPIO (CPU_GP_1) during suspend
to explicitly disable USB touchscreen interrupt. This is done to prevent
situation where the lid is closed the touchscreen is left functional.

The pinctrl driver (wrongly) assumes it owns all pins which are owned by
host and not locked down. It is perfectly fine for BIOS to use those pins
as it is also considered as host in this context.

What happens is that when the lid of Dell XPS 13 is closed, the BIOS
configures CPU_GP_1 low disabling the touchscreen interrupt. During resume
we restore all host owned pins to the known state which includes CPU_GP_1
and this overwrites what the BIOS has programmed there causing the
touchscreen to fail as no interrupts are reaching the CPU anymore.

Fix this by restoring only those pins we know are explicitly requested by
the kernel one way or other.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=176361
Reported-by: AceLan Kao <acelan.kao@canonical.com>
Tested-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pinctrl/intel/pinctrl-intel.c |   25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -23,6 +23,7 @@
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinconf-generic.h>
 
+#include "../core.h"
 #include "pinctrl-intel.h"
 
 /* Offset from regs */
@@ -1049,6 +1050,26 @@ int intel_pinctrl_remove(struct platform
 EXPORT_SYMBOL_GPL(intel_pinctrl_remove);
 
 #ifdef CONFIG_PM_SLEEP
+static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned pin)
+{
+	const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin);
+
+	if (!pd || !intel_pad_usable(pctrl, pin))
+		return false;
+
+	/*
+	 * Only restore the pin if it is actually in use by the kernel (or
+	 * by userspace). It is possible that some pins are used by the
+	 * BIOS during resume and those are not always locked down so leave
+	 * them alone.
+	 */
+	if (pd->mux_owner || pd->gpio_owner ||
+	    gpiochip_line_is_irq(&pctrl->chip, pin))
+		return true;
+
+	return false;
+}
+
 int intel_pinctrl_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -1062,7 +1083,7 @@ int intel_pinctrl_suspend(struct device
 		const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
 		u32 val;
 
-		if (!intel_pad_usable(pctrl, desc->number))
+		if (!intel_pinctrl_should_save(pctrl, desc->number))
 			continue;
 
 		val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0));
@@ -1123,7 +1144,7 @@ int intel_pinctrl_resume(struct device *
 		void __iomem *padcfg;
 		u32 val;
 
-		if (!intel_pad_usable(pctrl, desc->number))
+		if (!intel_pinctrl_should_save(pctrl, desc->number))
 			continue;
 
 		padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0);


Patches currently in stable-queue which might be from mika.westerberg@linux.intel.com are

queue-4.4/pinctrl-intel-only-restore-pins-that-are-used-by-the-driver.patch