linux-kernel - [PATCH] i3c: dw: Add shutdown support to dw_i3c

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Message-ID: <20250728104425.3878770-1-manikanta.guntupalli@amd.com>
Date: Mon, 28 Jul 2025 16:14:25 +0530
From: Manikanta Guntupalli <manikanta.guntupalli@....com>
To: <git@....com>, <alexandre.belloni@...tlin.com>, <Frank.Li@....com>,
	<wsa+renesas@...g-engineering.com>, <quic_msavaliy@...cinc.com>,
	<Shyam-sundar.S-k@....com>, <xiaopei01@...inos.cn>,
	<billy_tsai@...eedtech.com>, <linux-i3c@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: <michal.simek@....com>, <radhey.shyam.pandey@....com>,
	<srinivas.goud@....com>, <shubhrajyoti.datta@....com>,
	<manion05gk@...il.com>, Manikanta Guntupalli <manikanta.guntupalli@....com>
Subject: [PATCH] i3c: dw: Add shutdown support to dw_i3c_master driver

Add shutdown handler to the Synopsys DesignWare I3C master driver,
ensuring the device is gracefully disabled during system shutdown.

The shutdown handler cancels any pending hot-join work and disables
interrupts.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@....com>
---
 drivers/i3c/master/dw-i3c-master.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index ae1992665673..6769def5580a 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -1762,6 +1762,29 @@ static const struct dev_pm_ops dw_i3c_pm_ops = {
 	SET_RUNTIME_PM_OPS(dw_i3c_master_runtime_suspend, dw_i3c_master_runtime_resume, NULL)
 };
 
+static void dw_i3c_shutdown(struct platform_device *pdev)
+{
+	struct dw_i3c_master *master = platform_get_drvdata(pdev);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(master->dev);
+	if (ret < 0) {
+		dev_err(master->dev,
+			"<%s> cannot resume i3c bus master, err: %d\n",
+			__func__, ret);
+		return;
+	}
+
+	cancel_work_sync(&master->hj_work);
+
+	/* Disable interrupts */
+	writel((u32)~INTR_ALL, master->regs + INTR_STATUS_EN);
+	writel((u32)~INTR_ALL, master->regs + INTR_SIGNAL_EN);
+
+	pm_runtime_mark_last_busy(master->dev);
+	pm_runtime_put_autosuspend(master->dev);
+}
+
 static const struct of_device_id dw_i3c_master_of_match[] = {
 	{ .compatible = "snps,dw-i3c-master-1.00a", },
 	{},
@@ -1777,6 +1800,7 @@ MODULE_DEVICE_TABLE(acpi, amd_i3c_device_match);
 static struct platform_driver dw_i3c_driver = {
 	.probe = dw_i3c_probe,
 	.remove = dw_i3c_remove,
+	.shutdown = dw_i3c_shutdown,
 	.driver = {
 		.name = "dw-i3c-master",
 		.of_match_table = dw_i3c_master_of_match,
-- 
2.34.1