Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752734AbdHKIXj (ORCPT ); Fri, 11 Aug 2017 04:23:39 -0400 Received: from mga11.intel.com ([192.55.52.93]:20386 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752154AbdHKIXg (ORCPT ); Fri, 11 Aug 2017 04:23:36 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.41,356,1498546800"; d="scan'208";a="139060652" From: Rushikesh S Kadam To: mika.westerberg@linux.intel.com, heikki.krogerus@linux.intel.com, linus.walleij@linaro.org, linux-gpio@vger.kernel.org Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de, rajneesh.bhardwaj@intel.com, andy@infradead.org, rjw@rjwysocki.net, Rushikesh S Kadam Subject: [PATCH] pinctrl: intel: Disable GPIO pin interrupts in suspend Date: Fri, 11 Aug 2017 13:53:44 +0530 Message-Id: <1502439824-18733-1-git-send-email-rushikesh.s.kadam@intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2128 Lines: 47 The fix prevents unintended wakes from second level GPIO pin interrupts. On some Intel Kabylake platforms, it is observed that GPIO pin interrupts can wake the platform from suspend-to-idle, even though the IRQ is not configured as IRQF_NO_SUSPEND or enable_irq_wake(). This can cause undesired wakes on Mobile devices such as Laptops and Chromebook devices. For example a headset jack insertion is not a desired wake source on Chromebook devices. The pinctrl-intel (GPIO controller) driver implements a "Shared IRQ" model. All GPIO pin interrupts are OR'ed and mapped to a first level IRQ14 (or IRQ15). The driver registers an irq_chip struct and maps an irq_domain for the GPIO pin interrupts. The IRQ14 handler demuxes and calls the second level IRQ for the respective pin. In the suspend entry flow, at suspend_noirq stage, the kernel disables IRQs that are not marked for wake. The pinctrl-intel driver does not implement a irq_disable() callback (to take advantage of lazy disabling). The pinctrl-intel GPIO interrupts are not disabled in hardware during suspend entry, and thus are able to wake the SoC out of suspend-to-idle. This patch sets the IRQCHIP_MASK_ON_SUSPEND flag for the GPIO irq_chip, to disable the second level interrupts at suspend_noirq stage via the irq_mask callbacks. The irq_mask callback disables the IRQs in hardware by programming the corresponding GPIO pad registers. Only IRQs that are not marked for wake are disabled. Signed-off-by: Rushikesh S Kadam --- drivers/pinctrl/intel/pinctrl-intel.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c index 6dc1096..8f87215 100644 --- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -1035,6 +1035,7 @@ static irqreturn_t intel_gpio_irq(int irq, void *data) .irq_unmask = intel_gpio_irq_unmask, .irq_set_type = intel_gpio_irq_type, .irq_set_wake = intel_gpio_irq_wake, + .flags = IRQCHIP_MASK_ON_SUSPEND, }; static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) -- 1.9.1