Commit 3578b1cd authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Greg Kroah-Hartman
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usb: renesas_usbhs: Assert/de-assert reset signals on suspend/resume 



The Renesas RZ/G3S SoC supports a power-saving mode in which power to most
SoC components is turned off, including the USB subsystem.

To properly restore from such a state, the reset signal needs to be
asserted/de-asserted during suspend/resume. Add reset assert/de-assert on
suspend/resume.

The resume code has been moved into a separate function to allow reusing
it in case reset_control_assert() from suspend fails.

Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20251106143625.3050119-5-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e4d9da32

drivers/usb/renesas_usbhs/common.c

+26 −9
Original line number Diff line number Diff line
@@ -827,10 +827,26 @@ static void usbhs_remove(struct platform_device *pdev) 
	usbhs_pipe_remove(priv);

}



static void usbhsc_restore(struct device *dev)

{

	struct usbhs_priv *priv = dev_get_drvdata(dev);

	struct platform_device *pdev = usbhs_priv_to_pdev(priv);



	if (!usbhs_get_dparam(priv, runtime_pwctrl)) {

		usbhsc_power_ctrl(priv, 1);

		usbhs_mod_autonomy_mode(priv);

	}



	usbhs_platform_call(priv, phy_reset, pdev);



	usbhsc_schedule_notify_hotplug(pdev);

}



static int usbhsc_suspend(struct device *dev)

{

	struct usbhs_priv *priv = dev_get_drvdata(dev);

	struct usbhs_mod *mod = usbhs_mod_get_current(priv);

	int ret;



	if (mod) {

		usbhs_mod_call(priv, stop, priv);
@@ -840,22 +856,23 @@ static int usbhsc_suspend(struct device *dev) 
	if (mod || !usbhs_get_dparam(priv, runtime_pwctrl))

		usbhsc_power_ctrl(priv, 0);



	return 0;

	ret = reset_control_assert(priv->rsts);

	if (ret)

		usbhsc_restore(dev);



	return ret;

}



static int usbhsc_resume(struct device *dev)

{

	struct usbhs_priv *priv = dev_get_drvdata(dev);

	struct platform_device *pdev = usbhs_priv_to_pdev(priv);



	if (!usbhs_get_dparam(priv, runtime_pwctrl)) {

		usbhsc_power_ctrl(priv, 1);

		usbhs_mod_autonomy_mode(priv);

	}

	int ret;



	usbhs_platform_call(priv, phy_reset, pdev);

	ret = reset_control_deassert(priv->rsts);

	if (ret)

		return ret;



	usbhsc_schedule_notify_hotplug(pdev);

	usbhsc_restore(dev);



	return 0;

}