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usb: dwc2: disable platform lowlevel hw resources during shutdown

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On some SoC platforms, in shutdown stage, most components' power is cut
off, but there's still power supply to the so called always-on
domain, so if the dwc2's regulator is from the always-on domain, we
need to explicitly disable it to save power.

Disable platform lowlevel hw resources such as phy, clock and
regulators etc. in device shutdown hook to reduce non-necessary power
consumption when the platform enters shutdown stage.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Link: https://lore.kernel.org/r/20250629094655.747-1-jszhang@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jisheng Zhang 2025-06-29 17:46:55 +08:00 • committed by Greg Kroah-Hartman
parent f63f7aec00
commit 7481a97c5f
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/dwc2/platform.c
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@ -371,6 +371,9 @@ static void dwc2_driver_shutdown(struct platform_device *dev)
dwc2_disable_global_interrupts(hsotg);
synchronize_irq(hsotg->irq);
if (hsotg->ll_hw_enabled)
dwc2_lowlevel_hw_disable(hsotg);
}
/**