linux-kernel - [PATCH v7 9/9] usb: host: cdns3: forward lost power information to xhci

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Message-Id: <20250205-s2r-cdns-v7-9-13658a271c3c@bootlin.com>
Date: Wed, 05 Feb 2025 18:36:54 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Peter Chen <peter.chen@...nel.org>, Pawel Laszczak <pawell@...ence.com>, 
 Roger Quadros <rogerq@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Mathias Nyman <mathias.nyman@...el.com>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: Grégory Clement <gregory.clement@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, linux-usb@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org, 
 Théo Lebrun <theo.lebrun@...tlin.com>
Subject: [PATCH v7 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 7ba760ee62e3310e9c678d269d7675c9cb952ec6..f0df114c2b53bcb2a1fbeb1e582e0cbd69451d97 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