[PATCH 9/9] usb: host: cdns3: forward lost power information to xhci

Théo Lebrun
2025-01-29T10:56:26Z

cdns3-plat can know if power was lost across system-wide suspend.
Forward that information:

- Grab the lost_power bool from cdns_role_driver::resume(). Store it
into the power_lost field in struct xhci_plat_priv.

- xhci-plat will call xhci_resume() with that value (ORed to whether we
are in a hibernation restore).

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
---
drivers/usb/cdns3/host.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
index 7ba760ee62e3..f0df114c2b53 100644
--- a/drivers/usb/cdns3/host.c
+++ b/drivers/usb/cdns3/host.c
@@ -138,6 +138,16 @@ static void cdns_host_exit(struct cdns *cdns)
cdns_drd_host_off(cdns);
}

+static int cdns_host_resume(struct cdns *cdns, bool power_lost)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(cdns->host_dev);
+ struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
+
+ priv->power_lost = power_lost;
+
+ return 0;
+}
+
int cdns_host_init(struct cdns *cdns)
{
struct cdns_role_driver *rdrv;
@@ -148,6 +158,7 @@ int cdns_host_init(struct cdns *cdns)

rdrv->start = __cdns_host_init;
rdrv->stop = cdns_host_exit;
+ rdrv->resume = cdns_host_resume;
rdrv->state = CDNS_ROLE_STATE_INACTIVE;
rdrv->name = "host";

--
2.48.1