linux-kernel - [PATCH] usb: dwc2: disable platform lowlevel hw resources during shutdown

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Message-ID: <20250629094655.747-1-jszhang@kernel.org>
Date: Sun, 29 Jun 2025 17:46:55 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Minas Harutyunyan <hminas@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: dwc2: disable platform lowlevel hw resources during shutdown

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@...nel.org>
---
 drivers/usb/dwc2/platform.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 12b4dc07d08a..3f83ecc9fc23 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -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);
 }

 /**
-- 
2.49.0