diff options
| author | Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> | 2025-11-06 16:36:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-21 15:11:22 +0100 |
| commit | c31a401fe7abedabb5c05b5cbf36e2fdb3e6be63 (patch) | |
| tree | be63003fb2cc2d7202a5e755200ae79a426b89cc | |
| parent | a7d5fe02059af66c9759cbf9199e7ed381cc592a (diff) | |
| download | tip-c31a401fe7abedabb5c05b5cbf36e2fdb3e6be63.tar.gz | |
usb: host: ehci-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>
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>
| -rw-r--r-- | drivers/usb/host/ehci-platform.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c index 57d5a7ddac5f01..f61f095cedabbe 100644 --- a/drivers/usb/host/ehci-platform.c +++ b/drivers/usb/host/ehci-platform.c @@ -454,6 +454,17 @@ static int __maybe_unused ehci_platform_suspend(struct device *dev) if (pdata->power_suspend) 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; } @@ -464,11 +475,18 @@ static int __maybe_unused ehci_platform_resume(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); struct device *companion_dev; + int err; + + err = reset_control_deassert(priv->rsts); + 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->rsts); return err; + } } companion_dev = usb_of_get_companion_dev(hcd->self.controller); |