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Date: Fri, 16 Oct 2020 22:32:00 +0800 From: Coiby Xu <coiby.xu@...il.com> To: Barnabás Pőcze <pobrn@...tonmail.com> Cc: "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>, Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <benjamin.tissoires@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] HID: i2c-hid: add polling mode based on connected GPIO chip's pin status Hi Barnabás, Thank you for reviewing theis patch! I've Cced a new version to you. On Thu, Oct 15, 2020 at 10:33:50AM +0000, Barnabás Pőcze wrote: >Hi, > >I believe this patch causes I2C HID devices not to work with IRQs after resuming >from suspend. > > >> [...] >> #ifdef CONFIG_PM_SLEEP >> @@ -1183,7 +1292,8 @@ static int i2c_hid_suspend(struct device *dev) >> /* Save some power */ >> i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); >> >> - disable_irq(client->irq); >> + if (polling_mode == I2C_POLLING_DISABLED) >> + disable_irq(client->irq); >> > >The IRQ is disabled when suspending if polling is *off*. > > >> if (device_may_wakeup(&client->dev)) { >> wake_status = enable_irq_wake(client->irq); >> @@ -1216,7 +1326,7 @@ static int i2c_hid_resume(struct device *dev) >> >> if (ihid->pdata.post_power_delay_ms) >> msleep(ihid->pdata.post_power_delay_ms); >> - } else if (ihid->irq_wake_enabled) { >> + } else if (ihid->irq_wake_enabled && polling_mode != I2C_POLLING_DISABLED) { > >As a side note, I'm not sure if the 'polling_mode != I2C_POLLING_DISABLED' part >is necessary (or that it's necessary *here*). It causes 'i2c_hid_resume' and >'i2c_hid_suspend' to be "asymmetric" which - I believe - may cause problems. > > >> wake_status = disable_irq_wake(client->irq); >> if (!wake_status) >> ihid->irq_wake_enabled = false; >> @@ -1225,7 +1335,8 @@ static int i2c_hid_resume(struct device *dev) >> wake_status); >> } >> >> - enable_irq(client->irq); >> + if (polling_mode != I2C_POLLING_DISABLED) >> + enable_irq(client->irq); >> > >The IRQ is enabled when resuming if polling is *on*. It should be enabled if polling is *off* >in my opinion. > > >> [...] > > >Regards, >Barnabás Pőcze -- Best regards, Coiby
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