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

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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: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://patch.msgid.link/20251106143625.3050119-3-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Claudiu Beznea
2025-11-06 16:36:23 +02:00
committed by Greg Kroah-Hartman
parent a7d5fe0205
commit c31a401fe7
1 changed files with 20 additions and 2 deletions
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22
drivers/usb/host/ehci-platform.c
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@@ -454,6 +454,17 @@ static int __maybe_unused ehci_platform_suspend(struct device *dev)
if (pdata->power_suspend) if (pdata->power_suspend)
pdata->power_suspend(pdev); pdata->power_suspend(pdev);
ret = reset_control_assert(priv->rsts);
if (ret) {
if (pdata->power_on)
pdata->power_on(pdev);
ehci_resume(hcd, false);
if (priv->quirk_poll)
quirk_poll_init(priv);
}
return ret; return ret;
} }
@@ -464,12 +475,19 @@ static int __maybe_unused ehci_platform_resume(struct device *dev)
struct platform_device *pdev = to_platform_device(dev); struct platform_device *pdev = to_platform_device(dev);
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
struct device *companion_dev; struct device *companion_dev;
int err;
err = reset_control_deassert(priv->rsts);
if (err)
return err;
if (pdata->power_on) { if (pdata->power_on) {
int err = pdata->power_on(pdev); err = pdata->power_on(pdev);
if (err < 0) if (err < 0) {
reset_control_assert(priv->rsts);
return err; return err;
} }
}
companion_dev = usb_of_get_companion_dev(hcd->self.controller); companion_dev = usb_of_get_companion_dev(hcd->self.controller);
if (companion_dev) { if (companion_dev) {