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

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Message-ID: <20250129105613.403923-9-theo.lebrun@bootlin.com>
Date: Wed, 29 Jan 2025 11:56:13 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: theo.lebrun@...tlin.com,
	mathias.nyman@...ux.intel.com
Cc: rogerq@...nel.org,
	peter.chen@...nel.org,
	pawell@...ence.com,
	gregkh@...uxfoundation.org,
	mathias.nyman@...el.com,
	gregory.clement@...tlin.com,
	thomas.petazzoni@...tlin.com,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] usb: host: cdns3: forward lost power information to xhci

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@...tlin.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