linux-kernel - [PATCH v4 4/9] usb: cdns3-ti: support reset-on-resume behavior

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Message-Id: <20240307-j7200-usb-suspend-v4-4-5ec7615431f3@bootlin.com>
Date: Thu, 07 Mar 2024 10:55:05 +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 4/9] usb: cdns3-ti: support reset-on-resume behavior

Add match data support, with one boolean to indicate whether the
hardware resets after a system-wide suspend. If hardware resets, we
force execute ->runtime_resume() at system-wide resume to run the
hardware init sequence.

No compatible exploits this functionality, just yet.

Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
 drivers/usb/cdns3/cdns3-ti.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
index 4c8a557e6a6f..f76327566798 100644
--- a/drivers/usb/cdns3/cdns3-ti.c
+++ b/drivers/usb/cdns3/cdns3-ti.c
@@ -57,9 +57,14 @@ struct cdns_ti {
 	unsigned vbus_divider:1;
 	struct clk *usb2_refclk;
 	struct clk *lpm_clk;
+	const struct cdns_ti_match_data *match_data;
 	int usb2_refclk_rate_code;
 };
 
+struct cdns_ti_match_data {
+	bool reset_on_resume;
+};
+
 static const int cdns_ti_rate_table[] = {	/* in KHZ */
 	9600,
 	10000,
@@ -101,6 +106,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, data);
 
 	data->dev = dev;
+	data->match_data = device_get_match_data(dev);
 
 	data->usbss = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(data->usbss)) {
@@ -220,8 +226,29 @@ static int cdns_ti_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static int cdns_ti_suspend(struct device *dev)
+{
+	struct cdns_ti *data = dev_get_drvdata(dev);
+
+	if (data->match_data && data->match_data->reset_on_resume)
+		return pm_runtime_force_suspend(dev);
+	else
+		return 0;
+}
+
+static int cdns_ti_resume(struct device *dev)
+{
+	struct cdns_ti *data = dev_get_drvdata(dev);
+
+	if (data->match_data && data->match_data->reset_on_resume)
+		return pm_runtime_force_resume(dev);
+	else
+		return 0;
+}
+
 static const struct dev_pm_ops cdns_ti_pm_ops = {
 	RUNTIME_PM_OPS(NULL, cdns_ti_runtime_resume, NULL)
+	SYSTEM_SLEEP_PM_OPS(cdns_ti_suspend, cdns_ti_resume)
 };
 
 static const struct of_device_id cdns_ti_of_match[] = {

-- 
2.44.0