diff options
| author | Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> | 2025-11-06 16:36:24 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-21 15:11:22 +0100 |
| commit | e4d9da32bf6059cb485caac4c9c0a2e36cdd5573 (patch) | |
| tree | a18801dfb07b241ae668d5d77c495e6bcf2fb9f2 /drivers/usb | |
| parent | c31a401fe7abedabb5c05b5cbf36e2fdb3e6be63 (diff) | |
| download | tip-e4d9da32bf6059cb485caac4c9c0a2e36cdd5573.tar.gz | |
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: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20251106143625.3050119-4-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/ohci-platform.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c index af26f1449bc2e8..2e4bb5cc2165f2 100644 --- a/drivers/usb/host/ohci-platform.c +++ b/drivers/usb/host/ohci-platform.c @@ -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; } @@ -288,11 +297,19 @@ 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); |