linux-kernel - [PATCH v4 6/9] usb: cdns3: add quirk to platform data for reset-on-resume

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Date: Thu, 07 Mar 2024 10:55:07 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Roger Quadros <rogerq@...nel.org>, 
 Peter Chen <peter.chen@...nel.org>, Pawel Laszczak <pawell@...ence.com>, 
 Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Grégory Clement <gregory.clement@...tlin.com>, 
 Kevin Hilman <khilman@...nel.org>, Alan Stern <stern@...land.harvard.edu>, 
 linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Théo Lebrun <theo.lebrun@...tlin.com>
Subject: [PATCH v4 6/9] usb: cdns3: add quirk to platform data for
 reset-on-resume

The cdns3 host role does not care about reset-on-resume. xHCI however
reconfigures itself in silence rather than printing a warning about a
resume error. Related warning example:

  [   16.017462] xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit

Allow passing a CDNS3_RESET_ON_RESUME quirk flag from cdns3 pdata down
to xHCI pdata. The goal is to allow signaling about reset-on-resume
behavior from platform wrapper drivers.

When used, remote wakeup is not expected to work.

Acked-by: Peter Chen <peter.chen@...nel.org>
Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
 drivers/usb/cdns3/core.h | 1 +
 drivers/usb/cdns3/host.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
index 81a9c9d6be08..7487067ba23f 100644
--- a/drivers/usb/cdns3/core.h
+++ b/drivers/usb/cdns3/core.h
@@ -44,6 +44,7 @@ struct cdns3_platform_data {
 			bool suspend, bool wakeup);
 	unsigned long quirks;
 #define CDNS3_DEFAULT_PM_RUNTIME_ALLOW	BIT(0)
+#define CDNS3_RESET_ON_RESUME		BIT(1)
 };
 
 /**
diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
index 6164fc4c96a4..28c4d1deb231 100644
--- a/drivers/usb/cdns3/host.c
+++ b/drivers/usb/cdns3/host.c
@@ -91,6 +91,9 @@ static int __cdns_host_init(struct cdns *cdns)
 	if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
 		cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 
+	if (cdns->pdata && (cdns->pdata->quirks & CDNS3_RESET_ON_RESUME))
+		cdns->xhci_plat_data->quirks |= XHCI_RESET_ON_RESUME;
+
 	ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
 			sizeof(struct xhci_plat_priv));
 	if (ret)

-- 
2.44.0