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Tue, 11 Jun 2019 17:51:21 -0700 (PDT) Date: Tue, 11 Jun 2019 17:51:20 -0700 From: "dmitry.torokhov@gmail.com" To: Anson Huang Subject: Re: [RESEND] input: keyboard: imx: make sure keyboard can always wake up system Message-ID: <20190612005120.GI143729@dtor-ws> References: <1554341727-16084-1-git-send-email-Anson.Huang@nxp.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1554341727-16084-1-git-send-email-Anson.Huang@nxp.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190611_175124_038758_93240E19 X-CRM114-Status: GOOD ( 20.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "linux-kernel@vger.kernel.org" , dl-linux-imx , "kernel@pengutronix.de" , "linux-input@vger.kernel.org" , "festevam@gmail.com" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Apr 04, 2019 at 01:40:16AM +0000, Anson Huang wrote: > There are several scenarios that keyboard can NOT wake up system > from suspend, e.g., if a keyboard is depressed between system > device suspend phase and device noirq suspend phase, the keyboard > ISR will be called and both keyboard depress and release interrupts > will be disabled, then keyboard will no longer be able to wake up > system. Another scenario would be, if a keyboard is kept depressed, > and then system goes into suspend, the expected behavior would be > when keyboard is released, system will be waked up, but current > implementation can NOT achieve that, because both depress and release > interrupts are disabled in ISR, and the event check is still in > progress. > > To fix these issues, need to make sure keyboard's depress or release > interrupt is enabled after noirq device suspend phase, this patch > moves the suspend/resume callback to noirq suspend/resume phase, and > enable the corresponding interrupt according to current keyboard status. > > Signed-off-by: Anson Huang Applied, thank you. > --- > drivers/input/keyboard/imx_keypad.c | 18 ++++++++++++++---- > 1 file changed, 14 insertions(+), 4 deletions(-) > > diff --git a/drivers/input/keyboard/imx_keypad.c b/drivers/input/keyboard/imx_keypad.c > index cf08f4a..97500a2 100644 > --- a/drivers/input/keyboard/imx_keypad.c > +++ b/drivers/input/keyboard/imx_keypad.c > @@ -524,11 +524,12 @@ static int imx_keypad_probe(struct platform_device *pdev) > return 0; > } > > -static int __maybe_unused imx_kbd_suspend(struct device *dev) > +static int __maybe_unused imx_kbd_noirq_suspend(struct device *dev) > { > struct platform_device *pdev = to_platform_device(dev); > struct imx_keypad *kbd = platform_get_drvdata(pdev); > struct input_dev *input_dev = kbd->input_dev; > + unsigned short reg_val = readw(kbd->mmio_base + KPSR); > > /* imx kbd can wake up system even clock is disabled */ > mutex_lock(&input_dev->mutex); > @@ -538,13 +539,20 @@ static int __maybe_unused imx_kbd_suspend(struct device *dev) > > mutex_unlock(&input_dev->mutex); > > - if (device_may_wakeup(&pdev->dev)) > + if (device_may_wakeup(&pdev->dev)) { > + if (reg_val & KBD_STAT_KPKD) > + reg_val |= KBD_STAT_KRIE; > + if (reg_val & KBD_STAT_KPKR) > + reg_val |= KBD_STAT_KDIE; > + writew(reg_val, kbd->mmio_base + KPSR); > + > enable_irq_wake(kbd->irq); > + } > > return 0; > } > > -static int __maybe_unused imx_kbd_resume(struct device *dev) > +static int __maybe_unused imx_kbd_noirq_resume(struct device *dev) > { > struct platform_device *pdev = to_platform_device(dev); > struct imx_keypad *kbd = platform_get_drvdata(pdev); > @@ -568,7 +576,9 @@ static int __maybe_unused imx_kbd_resume(struct device *dev) > return ret; > } > > -static SIMPLE_DEV_PM_OPS(imx_kbd_pm_ops, imx_kbd_suspend, imx_kbd_resume); > +static const struct dev_pm_ops imx_kbd_pm_ops = { > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_kbd_noirq_suspend, imx_kbd_noirq_resume) > +}; > > static struct platform_driver imx_keypad_driver = { > .driver = { > -- > 2.7.4 > -- Dmitry _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel