diff options
| author | Stefan Wahren <wahrenst@gmx.net> | 2025-02-17 14:41:32 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-19 15:15:54 +0100 |
| commit | ba6e518d136b25b340ddedb97a79db5642e4ed7f (patch) | |
| tree | 124618833a10c1a1830df5a9c42c6bb70357bd46 /drivers/usb/dwc2/core.c | |
| parent | 8b7a1b3da2e290bcbe8024519c86ddf1aa2096e8 (diff) | |
usb: dwc2: Implement recovery after PM domain off
According to the dt-bindings there are some platforms, which have a
dedicated USB power domain for DWC2 IP core supply. If the power domain
is switched off during system suspend then all USB register will lose
their settings.
Use GUSBCFG_TOUTCAL as a canary to detect that the power domain has
been powered off during suspend. Since the GOTGCTL_CURMODE_HOST doesn't
match on all platform with the current mode, additionally backup
GINTSTS. This works reliable to decide which registers should be
restored.
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250217134132.36786-4-wahrenst@gmx.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc2/core.c')
| -rw-r--r-- | drivers/usb/dwc2/core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c index 9919ab725d54..c3d24312db0f 100644 --- a/drivers/usb/dwc2/core.c +++ b/drivers/usb/dwc2/core.c @@ -43,6 +43,7 @@ int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg) /* Backup global regs */ gr = &hsotg->gr_backup; + gr->gintsts = dwc2_readl(hsotg, GINTSTS); gr->gotgctl = dwc2_readl(hsotg, GOTGCTL); gr->gintmsk = dwc2_readl(hsotg, GINTMSK); gr->gahbcfg = dwc2_readl(hsotg, GAHBCFG); |