Re: [PATCH v4 3/6] usb: dwc2: fix a possible interrupt storm on stm32mp1

[sashiko-bot@kernel.org]

> On stm32mp1, upon resume from low power (stop) mode, in host mode, a
> port interrupt storm may be seen before the hardware is accessible.
> 
> The core is able to generate interrupts during system resume in
> platform.c when calling dwc2_resume()->__dwc2_lowlevel_hw_enable(). As
> the PHY and clocks become available, a resume IRQ can be seen with a
> Host Port Interrupt (PrtInt).
> 
> The wakeup interrupt handler make the controller to exit power down mode,
> but the HCD handler returns IRQ_NONE, due to the HW accessible flag has
> been cleared in _dwc2_hcd_suspend() earlier. It ends-up with the bad_irq
> handler.
> 
> So set the HCD_FLAG_HW_ACCESSIBLE flag when the resume IRQ is handled to
> exit from power down mode.
> 
> Fixes: ef5e0eec4764 ("usb: dwc2: Add clock gating exiting flow by system resume")
> Cc: stable@vger.kernel.org
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261113-dwc2-low-power-fixes-stm32-v4-0-08a8c962a09e@foss.st.com?part=3