Re: [PATCH 4/5] usb: dwc3: qcom: Clear pending interrupt before enabling wake interrupt

Johan Hovold
2023-03-28T09:28:55Z

On Sat, Mar 25, 2023 at 10:22:16PM +0530, Manivannan Sadhasivam wrote:
> It is possible that there may be a pending interrupt logged into the dwc IP
> while the interrupts were disabled in the driver. And when the wakeup
> interrupt is enabled, the pending interrupt might fire which is not
> required to be serviced by the driver.
>
> So always clear the pending interrupt before enabling wake interrupt.
>
> Cc: stable@vger.kernel.org # 5.20
> Fixes: 360e8230516d ("usb: dwc3: qcom: Add helper functions to enable,disable wake irqs")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
> drivers/usb/dwc3/dwc3-qcom.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index bbf67f705d0d..f1059dfcb0e8 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -346,6 +346,8 @@ static void dwc3_qcom_enable_wakeup_irq(int irq, unsigned int polarity)
> if (!irq)
> return;
>
> + irq_set_irqchip_state(irq, IRQCHIP_STATE_PENDING, 0);
> +

This looks like a hack (and a layering violation). Note that there are
no other non-irqchip drivers calling this function.

> if (polarity)
> irq_set_irq_type(irq, polarity);

Johan