linux-kernel - Re: [PATCH V1 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P IRQ

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Date:   Mon, 9 Aug 2021 16:35:08 +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 V1 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P
 IRQ


On 8/6/2021 1:10 AM, Stephen Boyd wrote:
> Quoting Deepak Kumar Singh (2021-08-05 09:17:33)
>> Some use cases require SMP2P interrupts to wake up the host
>> from suspend.
> Please elaborate on this point so we understand what sort of scenarios
> want to wakeup from suspend.

Once such scenario is where WiFi/modem crashes and notifies crash to 
local host through smp2p

if local host is in suspend it should wake up to handle the crash and 
reboot the WiFi/modem.

>> Mark smp2p interrupt as wakeup capable to abort
>> the suspend.
>>
>> Signed-off-by: Deepak Kumar Singh <deesin@...eaurora.org>
>> ---
>>   drivers/soc/qcom/smp2p.c | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
>> index 2df4883..f8659b0 100644
>> --- a/drivers/soc/qcom/smp2p.c
>> +++ b/drivers/soc/qcom/smp2p.c
>> @@ -18,6 +18,7 @@
>>   #include <linux/soc/qcom/smem.h>
>>   #include <linux/soc/qcom/smem_state.h>
>>   #include <linux/spinlock.h>
>> +#include <linux/pm_wakeirq.h>
>>
>>   /*
>>    * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
>> @@ -538,9 +539,19 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
>>                  goto unwind_interfaces;
>>          }
>>
>> +       ret = device_init_wakeup(&pdev->dev, true);
> Is smp2p supposed to wake up the device by default? If not, then this
> should be device_set_wakeup_capable() instead so that userspace can
> decide if it wants to get the wakeup.
yes, we want smp2p to be wake up capable by default.
>> +       if (ret)
>> +               goto unwind_interfaces;
>> +
>> +       ret = dev_pm_set_wake_irq(&pdev->dev, irq);
>> +       if (ret)
>> +               goto set_wakeup_failed;
> Otherwise this looks good to me.
>
>>          return 0;
>>
>> +set_wakeup_failed:
>> +       device_init_wakeup(&pdev->dev, false);
>> +
>>   unwind_interfaces:
>>          list_for_each_entry(entry, &smp2p->inbound, node)
>>                  irq_domain_remove(entry->domain);