linux-kernel - [PATCH v5 10/12] usb: cdns3: host: transmit lost

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Message-Id: <20240726-s2r-cdns-v5-10-8664bfb032ac@bootlin.com>
Date: Fri, 26 Jul 2024 20:17:58 +0200
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Roger Quadros <rogerq@...nel.org>, 
 Peter Chen <peter.chen@...nel.org>, Pawel Laszczak <pawell@...ence.com>, 
 Mathias Nyman <mathias.nyman@...el.com>, Nishanth Menon <nm@...com>, 
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Kevin Hilman <khilman@...nel.org>, 
 Grégory Clement <gregory.clement@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>
Subject: [PATCH v5 10/12] usb: cdns3: host: transmit lost_power signal from
 wrapper to XHCI

cdns_role_driver->resume() receives the information if power was lost
across suspend (ie if a reset occurred). Transmit that to the XHCI core
using the newly introduced lost_power flag. We therefore override its
default value that is based on XHCI_RESET_ON_RESUME.

Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
 drivers/usb/cdns3/host.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
index d2cb529630e4..edef39ab8d15 100644
--- a/drivers/usb/cdns3/host.c
+++ b/drivers/usb/cdns3/host.c
@@ -139,6 +139,15 @@ static void cdns_host_exit(struct cdns *cdns)
 	cdns_drd_host_off(cdns);
 }
 
+static int cdns_host_resume(struct cdns *cdns, bool lost_power)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(cdns->host_dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	xhci->lost_power = lost_power;
+	return 0;
+}
+
 int cdns_host_init(struct cdns *cdns)
 {
 	struct cdns_role_driver *rdrv;
@@ -149,6 +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";
 

-- 
2.45.2