github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-23 22:52:19 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

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

Browse Source 
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>
This commit is contained in:
Claudiu Beznea 2025-11-06 16:36:24 +02:00 committed by Greg Kroah-Hartman
parent c31a401fe7
commit e4d9da32bf
1 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/usb/host/ohci-platform.c
View File

@ -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);