From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752615AbbHMM7t (ORCPT ); Thu, 13 Aug 2015 08:59:49 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:48114 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752271AbbHMM7q (ORCPT ); Thu, 13 Aug 2015 08:59:46 -0400 Message-ID: <55CC9493.9020101@ti.com> Date: Thu, 13 Aug 2015 15:58:59 +0300 From: Grygorii Strashko User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 MIME-Version: 1.0 To: Marc Zyngier , "tglx@linutronix.de" , "tony@atomide.com" CC: "linux@arm.linux.org.uk" , "nsekhar@ti.com" , "jason@lakedaemon.net" , "balbi@ti.com" , "linux-omap@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v2 2/6] genirq: fix irqchip_set_wake_parent if IRQCHIP_SKIP_SET_WAKE References: <1439401562-28874-1-git-send-email-grygorii.strashko@ti.com> <1439401562-28874-3-git-send-email-grygorii.strashko@ti.com> <55CC6AFF.8060400@arm.com> <55CC71E8.80604@ti.com> In-Reply-To: <55CC71E8.80604@ti.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/13/2015 01:31 PM, Grygorii Strashko wrote: > On 08/13/2015 01:01 PM, Marc Zyngier wrote: >> On 12/08/15 18:45, Grygorii Strashko wrote: >>> The irqchip_set_wake_parent should not fail if IRQ chip >>> specifies IRQCHIP_SKIP_SET_WAKE. Otherwise, IRQ wakeup >>> configuration can't be propagated properly through IRQ >>> domains hierarchy. >>> >>> In case of TI OMAP DRA7 the issue reproduced with following >>> configuration: >>> ARM GIC<-OMAP wakeupgen<-TI CBAR<-GPIO<-GPIO pcf857x<-gpio_key >>> >>> gpio_key is wakeup source >>> >>> Failure is reproduced during suspend/resume to RAM: >>> suspend: >>> - gpio_keys_suspend >>> enable_irq_wake >>> + pcf857x_irq_set_wake >>> + omap_gpio_wake_enable >>> + TI CBAR irq_chip_set_wake_parent >>> + OMAP wakeupgen has no .irq_set_wake() >> >> Most importantly, wakeupgen has IRQCHIP_SKIP_SET_WAKE set. >> >>> and -ENOSYS will be returned >>> >>> resume: >>> - gpio_keys_resume >>> + disable_irq_wake >>> + irq_set_irq_wake >>> + WARN(1, "Unbalanced IRQ %d wake disable\n", irq); >>> >>> Fixes: 08b55e2a9208 ('genirq: Add irqchip_set_wake_parent') >>> Signed-off-by: Grygorii Strashko >>> --- >>> kernel/irq/chip.c | 4 ++++ >>> 1 file changed, 4 insertions(+) >>> >>> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c >>> index 6de638b..bdb1b9d 100644 >>> --- a/kernel/irq/chip.c >>> +++ b/kernel/irq/chip.c >>> @@ -1024,6 +1024,10 @@ int irq_chip_set_vcpu_affinity_parent(struct >>> irq_data *data, void *vcpu_info) >>> int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on) >>> { >>> data = data->parent_data; >>> + >>> + if (irq_data_get_irq_chip(data)->flags & IRQCHIP_SKIP_SET_WAKE) >>> + return 0; >>> + >>> if (data->chip->irq_set_wake) >>> return data->chip->irq_set_wake(data, on); >>> >>> >> >> We have a more general issue with chip flags, and how they combine >> within a stack of irqchips. > > Indeed. Problem looks similar to IRQCHIP_MASK_ON_SUSPEND flag usage. > >> >> What if you remove the irq_chip_set_wake_parent from the crossbar >> driver, and instead set IRQCHIP_SKIP_SET_WAKE? > > I've thought about this and it should work for me. > One question - what if crossbar will be not the last one in > IRQ domains hierarchy? > I can confirm, if I revert this patch, add IRQCHIP_SKIP_SET_WAKE to the crossbar and remove irq_chip_set_wake_parent wakeups still works. What do you prefer me to do: add additional patch for the crossbar, drop/keep this patch? -- regards, -grygorii