Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946178AbbEPIAp (ORCPT ); Sat, 16 May 2015 04:00:45 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:46627 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753552AbbEPH7R (ORCPT ); Sat, 16 May 2015 03:59:17 -0400 X-Listener-Flag: 11101 From: Yingjoe Chen To: Mark Rutland , Matthias Brugger , Thomas Gleixner , Russell King CC: Arnd Bergmann , Olof Johansson , , Stephen Boyd , Pawel Moll , Catalin Marinas , Daniel Lezcano , , Marc Carino , Rob Herring , , Sascha Hauer , Yingjoe Chen , , Subject: [PATCH v2 3/9] clocksource: mediatek: do not enable GPT_CLK_EVT when setup Date: Sat, 16 May 2015 15:58:24 +0800 Message-ID: <1431763110-443-4-git-send-email-yingjoe.chen@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1431763110-443-1-git-send-email-yingjoe.chen@mediatek.com> References: <1431763110-443-1-git-send-email-yingjoe.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2377 Lines: 64 Spurious mtk timer interrupt is noticed at boot and cause kernel crash. It seems if GPT is enabled, it will latch irq status even when its IRQ is disabled. When irq is enabled afterward, we see spurious interrupt. Change init flow to only enable GPT_CLK_SRC at mtk_timer_init. Signed-off-by: Yingjoe Chen --- drivers/clocksource/mtk_timer.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c index 68ab423..91206f9 100644 --- a/drivers/clocksource/mtk_timer.c +++ b/drivers/clocksource/mtk_timer.c @@ -157,8 +157,11 @@ static void mtk_timer_global_reset(struct mtk_clock_event_device *evt) } static void -mtk_timer_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option) +mtk_timer_setup(struct mtk_clock_event_device *evt, + u8 timer, u8 option, u8 enable) { + u32 val; + writel(TIMER_CTRL_CLEAR | TIMER_CTRL_DISABLE, evt->gpt_base + TIMER_CTRL_REG(timer)); @@ -167,8 +170,10 @@ mtk_timer_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option) writel(0x0, evt->gpt_base + TIMER_CMP_REG(timer)); - writel(TIMER_CTRL_OP(option) | TIMER_CTRL_ENABLE, - evt->gpt_base + TIMER_CTRL_REG(timer)); + val = TIMER_CTRL_OP(option); + if (enable) + val |= TIMER_CTRL_ENABLE; + writel(val, evt->gpt_base + TIMER_CTRL_REG(timer)); } static void mtk_timer_enable_irq(struct mtk_clock_event_device *evt, u8 timer) @@ -235,12 +240,12 @@ static void __init mtk_timer_init(struct device_node *node) evt->ticks_per_jiffy = DIV_ROUND_UP(rate, HZ); /* Configure clock source */ - mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN); + mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN, 1); clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC), node->name, rate, 300, 32, clocksource_mmio_readl_up); /* Configure clock event */ - mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT); + mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT, 0); clockevents_config_and_register(&evt->dev, rate, 0x3, 0xffffffff); -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/