linux-kernel - Re: [PATCH v10 6/6] usb: dwc3: qcom: Enable the interrupts during probe

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Date:   Tue, 25 Jan 2022 14:47:59 +0530
From:   Sandeep Maheswaram <quic_c_sanm@...cinc.com>
To:     Pavan Kondeti <quic_pkondeti@...cinc.com>,
        Steev Klimaszewski <steev@...i.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_ppratap@...cinc.com>
Subject: Re: [PATCH v10 6/6] usb: dwc3: qcom: Enable the interrupts during
 probe

Hi Steev,

On 1/20/2022 10:52 AM, Sandeep Maheswaram wrote:
> Hi Pavan,
>
> On 1/18/2022 3:22 PM, Pavan Kondeti wrote:
>> On Tue, Jan 18, 2022 at 12:12:30AM -0600, Steev Klimaszewski wrote:
>>> On 1/16/22 11:44 PM, Sandeep Maheswaram wrote:
>>>> Enable the interrupts during probe and remove the disable interrupts
>>>> function.
>>>>
>>>> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
>>>> ---
>>>>   drivers/usb/dwc3/dwc3-qcom.c | 28 ++++------------------------
>>>>   1 file changed, 4 insertions(+), 24 deletions(-)
>>>>
>>>> diff --git a/drivers/usb/dwc3/dwc3-qcom.c 
>>>> b/drivers/usb/dwc3/dwc3-qcom.c
>>>> index 54dc3d3..7c5e636 100644
>>>> --- a/drivers/usb/dwc3/dwc3-qcom.c
>>>> +++ b/drivers/usb/dwc3/dwc3-qcom.c
>>>> @@ -306,25 +306,7 @@ static void dwc3_qcom_enable_wakeup_irq(int irq)
>>>>       enable_irq_wake(irq);
>>>>   }
>>>> -static void dwc3_qcom_disable_wakeup_irq(int irq)
>>>> -{
>>>> -    if (!irq)
>>>> -        return;
>>>> -
>>>> -    disable_irq_wake(irq);
>>>> -    disable_irq_nosync(irq);
>>>> -}
>>>> -static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
>>>> -{
>>>> -    dwc3_qcom_disable_wakeup_irq(qcom->hs_phy_irq);
>>>> -
>>>> -    dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
>>>> -
>>>> -    dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
>>>> -
>>>> -    dwc3_qcom_disable_wakeup_irq(qcom->ss_phy_irq);
>>>> -}
>>>>   static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
>>>>   {
>>>> @@ -356,9 +338,6 @@ static int dwc3_qcom_suspend(struct dwc3_qcom 
>>>> *qcom)
>>>>       if (ret)
>>>>           dev_warn(qcom->dev, "failed to disable interconnect: 
>>>> %d\n", ret);
>>>> -    if (device_may_wakeup(qcom->dev))
>>>> -        dwc3_qcom_enable_interrupts(qcom);
>>>> -
>>>>       qcom->is_suspended = true;
>>>>       return 0;
>>>> @@ -372,9 +351,6 @@ static int dwc3_qcom_resume(struct dwc3_qcom 
>>>> *qcom)
>>>>       if (!qcom->is_suspended)
>>>>           return 0;
>>>> -    if (device_may_wakeup(qcom->dev))
>>>> -        dwc3_qcom_disable_interrupts(qcom);
>>>> -
>>>>       for (i = 0; i < qcom->num_clocks; i++) {
>>>>           ret = clk_prepare_enable(qcom->clks[i]);
>>>>           if (ret < 0) {
>>>> @@ -832,6 +808,10 @@ static int dwc3_qcom_probe(struct 
>>>> platform_device *pdev)
>>>>       genpd->flags |= GENPD_FLAG_ALWAYS_ON;
>>>>       device_init_wakeup(&pdev->dev, 1);
>>>> +
>>>> +    if (device_may_wakeup(qcom->dev))
>>>> +        dwc3_qcom_enable_interrupts(qcom);
>>>> +
>>>>       qcom->is_suspended = false;
>>>>       pm_runtime_set_active(dev);
>>>>       pm_runtime_enable(dev);
>>> Hi Sandeep,
>>>
>>> I was testing this series on my Lenovo Yoga C630, and with this 
>>> patch in
>>> particular applied, my system will no longer boot. Unfortunately I 
>>> don't get
>>> any sort of good output at all, I just get hung tasks when trying to 
>>> probe
>>> things it would seem.
>>>
>>>
>>> With the other 5 patches in the series applied, the system still 
>>> boots and
>>> works correctly.
>>>
>>>
>> Sandeep,
>>
>> Enable DP/DM interrupts all the time might be creating a storm of 
>> interrupts.
>> calling enable_irq_wake() during probe is okay, but not the 
>> enable_irq().
>>
>> Did you verify your change with a Highspeed/Fullspeed device connected?
>>
>> Thanks,
>> Pavan
>
> I didn't face any such issue with devices connected.
>
> I think this is because I used IRQ_TYPE_EDGE_BOTH in device tree and 
> Steev has IRQ_TYPE_LEVEL_HIGH in his device tree.
>
> When i changed to IRQ_TYPE_LEVEL_HIGH I also observed a storm of 
> interrupts in my device though it booted .
>
> Regards
>
> Sandeep
>
Can you try with IRQ_TYPE_EDGE_BOTH in your device tree and see if you 
are getting the issue.

Regards

Sandeep