Commit e4d9da32 authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Greg Kroah-Hartman
Browse files

usb: host: ohci-platform: Call reset assert/deassert on suspend/resume 



The Renesas RZ/G3S SoC supports a power-saving mode in which power to most
of the SoC components is turned off, including the USB blocks. On the
resume path, the reset signal must be de-asserted before applying any
settings to the USB registers. To handle this properly, call
reset_control_assert() and reset_control_deassert() during suspend and
resume, respectively.

Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20251106143625.3050119-4-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c31a401f

drivers/usb/host/ohci-platform.c

+19 −2
Original line number Diff line number Diff line
@@ -270,6 +270,7 @@ static int ohci_platform_suspend(struct device *dev) 
	struct usb_hcd *hcd = dev_get_drvdata(dev);

	struct usb_ohci_pdata *pdata = dev->platform_data;

	struct platform_device *pdev = to_platform_device(dev);

	struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);

	bool do_wakeup = device_may_wakeup(dev);

	int ret;
@@ -280,6 +281,14 @@ static int ohci_platform_suspend(struct device *dev) 
	if (pdata->power_suspend)

		pdata->power_suspend(pdev);



	ret = reset_control_assert(priv->resets);

	if (ret) {

		if (pdata->power_on)

			pdata->power_on(pdev);



		ohci_resume(hcd, false);

	}



	return ret;

}
@@ -288,12 +297,20 @@ static int ohci_platform_resume_common(struct device *dev, bool hibernated) 
	struct usb_hcd *hcd = dev_get_drvdata(dev);

	struct usb_ohci_pdata *pdata = dev_get_platdata(dev);

	struct platform_device *pdev = to_platform_device(dev);

	struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);

	int err;



	err = reset_control_deassert(priv->resets);

	if (err)

		return err;



	if (pdata->power_on) {

		int err = pdata->power_on(pdev);

		if (err < 0)

		err = pdata->power_on(pdev);

		if (err < 0) {

			reset_control_assert(priv->resets);

			return err;

		}

	}



	ohci_resume(hcd, hibernated);