From mboxrd@z Thu Jan 1 00:00:00 1970 From: jean.pihet@newoldbits.com (Jean Pihet) Date: Wed, 1 Feb 2012 09:49:51 +0100 Subject: [PATCH 12/20] ARM: OMAP3+: SmartReflex: disable spamming interrupts In-Reply-To: <1328086199-28486-1-git-send-email-j-pihet@ti.com> References: <1328086199-28486-1-git-send-email-j-pihet@ti.com> Message-ID: <1328086199-28486-13-git-send-email-j-pihet@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Nishanth Menon At times with bad SR configurations, especially during silicon bring-ups, we could get continuous spurious interrupts which end up hanging the platform in the form of an ISR call for status bits that are automatically enabled by the hardware without any software clearing option. If we detect scenarios where ISR was called without the corresponding notification bit being set, instead of hanging up the system, we will disable interrupt after noting the event in the system log to try and keep system sanity and allow developer to debug and fix the condition. Signed-off-by: Nishanth Menon Signed-off-by: Jean Pihet --- arch/arm/mach-omap2/smartreflex.c | 21 +++++++++++++++++++-- 1 files changed, 19 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c index a24a228..6971b94 100644 --- a/arch/arm/mach-omap2/smartreflex.c +++ b/arch/arm/mach-omap2/smartreflex.c @@ -215,8 +215,25 @@ static irqreturn_t sr_interrupt(int irq, void *data) value = irqstat_to_notifier_v2(status); } - if (sr_class->notify) - sr_class->notify(sr_info->voltdm, value); + /* Attempt some resemblance of recovery! */ + if (!value) { + dev_err(&sr_info->pdev->dev, "%s: Spurious interrupt!" + "status = 0x%08x. Disabling to prevent spamming!!\n", + __func__, status); + disable_irq_nosync(sr_info->irq); + sr_info->irq_enabled = false; + } else { + /* If the caller reports inability to handle, disable as well */ + if (sr_class->notify && + sr_class->notify(sr_info->voltdm, value)) { + dev_err(&sr_info->pdev->dev, "%s: Callback cant handle!" + "status=0x%08x. Disabling to prevent spam!!\n", + __func__, status); + disable_irq_nosync(sr_info->irq); + sr_info->irq_enabled = false; + } + + } return IRQ_HANDLED; } -- 1.7.5.4