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Wysocki" , Len Brown , Pavel Machek , , , , , , , Tony Lindgren , Tianping Fang , Eddie Hung , "Ikjoon Jang" , Nicolas Boichat Subject: [PATCH 1/6] PM: runtime: enable wake irq after runtime_suspend hook called Date: Thu, 8 Apr 2021 17:35:09 +0800 Message-ID: <1617874514-12282-1-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty MIME-Version: 1.0 X-TM-SNTS-SMTP: E5C6DB1EBBB6601790860FBE2A607D826DC4ADE8017410E55972F9D1B0FDA48D2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210408_103531_126193_EB34E641 X-CRM114-Status: GOOD ( 11.60 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org When the dedicated wake irq is level trigger, enable it before calling runtime_suspend, will trigger an interrupt. e.g. for a low level trigger type, it's low level at running time (0), and becomes high level when enters suspend (runtime_suspend (1) is called), a wakeup signal at (2) make it become low level, wake irq will be triggered. ------------------ | ^ ^| ---------------- | | -------------- |<---(0)--->|<--(1)--| (3) (2) (4) if we enable the wake irq before calling runtime_suspend during (0), an interrupt will arise, it causes resume immediately; enable wake irq after calling runtime_suspend, e.g. at (3) or (4), will works. This patch seems no side effect on edge trigger wake irq. Signed-off-by: Chunfeng Yun --- drivers/base/power/runtime.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index a46a7e30881b..796739a015a5 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -619,12 +619,12 @@ static int rpm_suspend(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_SUSPENDING); callback = RPM_GET_CALLBACK(dev, runtime_suspend); - - dev_pm_enable_wake_irq_check(dev, true); retval = rpm_callback(callback, dev); if (retval) goto fail; + dev_pm_enable_wake_irq_check(dev, true); + no_callback: __update_runtime_status(dev, RPM_SUSPENDED); pm_runtime_deactivate_timer(dev); @@ -659,7 +659,6 @@ static int rpm_suspend(struct device *dev, int rpmflags) return retval; fail: - dev_pm_disable_wake_irq_check(dev); __update_runtime_status(dev, RPM_ACTIVE); dev->power.deferred_resume = false; wake_up_all(&dev->power.wait_queue);