linux-kernel - Re: [PATCH V4 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P IRQ

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Date:   Tue, 21 Sep 2021 15:58:33 +0530
From:   Deepak Kumar Singh <deesin@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, bjorn.andersson@...aro.org,
        clew@...eaurora.org, sibis@...eaurora.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, Andy Gross <agross@...nel.org>
Subject: Re: [PATCH V4 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P
 IRQ


On 9/21/2021 12:07 AM, Stephen Boyd wrote:
> Quoting Deepak Kumar Singh (2021-09-18 12:02:15)
>> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
>> index 2df4883..60ad632 100644
>> --- a/drivers/soc/qcom/smp2p.c
>> +++ b/drivers/soc/qcom/smp2p.c
>> @@ -14,6 +14,7 @@
>>   #include <linux/mfd/syscon.h>
>>   #include <linux/module.h>
>>   #include <linux/platform_device.h>
>> +#include <linux/pm_wakeirq.h>
>>   #include <linux/regmap.h>
>>   #include <linux/soc/qcom/smem.h>
>>   #include <linux/soc/qcom/smem_state.h>
>> @@ -538,9 +539,26 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
>>                  goto unwind_interfaces;
>>          }
>>
>> +       /*
>> +        * Treat smp2p interrupt as wakeup source, but keep it disabled
>> +        * by default. User space can decide enabling it depending on its
>> +        * use cases. For example if remoteproc crashes and device wants
>> +        * to handle it immediatedly (e.g. to not miss phone calls) it can
>> +        * enable wakeup source from user space, while other devices which
>> +        * do not have proper autosleep feature may want to handle it with
>> +        * other wakeup events (e.g. Power button) instead waking up immediately.
>> +        */
>> +       device_set_wakeup_capable(&pdev->dev, true);
>> +
>> +       ret = dev_pm_set_wake_irq(&pdev->dev, irq);
>> +       if (ret)
>> +               goto set_wake_irq_fail;
>>
>>          return 0;
>>
>> +set_wake_irq_fail:
>> +       dev_pm_clear_wake_irq(&pdev->dev);
>> +
>>   unwind_interfaces:
>>          list_for_each_entry(entry, &smp2p->inbound, node)
>>                  irq_domain_remove(entry->domain);
>> @@ -565,6 +583,9 @@ static int qcom_smp2p_remove(struct platform_device *pdev)
>>          struct qcom_smp2p *smp2p = platform_get_drvdata(pdev);
>>          struct smp2p_entry *entry;
>>
>> +       dev_pm_clear_wake_irq(&pdev->dev);
>> +       device_init_wakeup(&pdev->dev, false);
> Is this device_init_wakeup() call necessary? It looks like we can get
> away without it and then once this driver probes the device will have
> the wakeup capability set on it. Future binding/unbinding of the driver
> will keep working.

ok, cleanup is handled in device_unregister() path. So it is redundant here.

I will remove this in next patch.