linux-kernel - [PATCH 2/6] mei: vsc: Enhance IVSC chipset stability during warm reboot

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Message-Id: <20240623093056.4169438-3-wentong.wu@intel.com>
Date: Sun, 23 Jun 2024 17:30:52 +0800
From: Wentong Wu <wentong.wu@...el.com>
To: sakari.ailus@...ux.intel.com,
	tomas.winkler@...el.com,
	gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	Wentong Wu <wentong.wu@...el.com>,
	stable@...r.kernel.org,
	Jason Chen <jason.z.chen@...el.com>
Subject: [PATCH 2/6] mei: vsc: Enhance IVSC chipset stability during warm reboot

During system shutdown, incorporate reset logic to ensure the IVSC
chipset remains in a valid state. This adjustment guarantees that
the IVSC chipset operates in a known state following a warm reboot.

Fixes: 566f5ca97680 ("mei: Add transport driver for IVSC device")
Cc: stable@...r.kernel.org # for 6.8+
Signed-off-by: Wentong Wu <wentong.wu@...el.com>
Tested-by: Jason Chen <jason.z.chen@...el.com>
---
 drivers/misc/mei/vsc-tp.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/misc/mei/vsc-tp.c b/drivers/misc/mei/vsc-tp.c
index dcab5174bf00..4595b1a25536 100644
--- a/drivers/misc/mei/vsc-tp.c
+++ b/drivers/misc/mei/vsc-tp.c
@@ -570,6 +570,19 @@ static void vsc_tp_remove(struct spi_device *spi)
 	free_irq(spi->irq, tp);
 }
 
+static void vsc_tp_shutdown(struct spi_device *spi)
+{
+	struct vsc_tp *tp = spi_get_drvdata(spi);
+
+	platform_device_unregister(tp->pdev);
+
+	mutex_destroy(&tp->mutex);
+
+	vsc_tp_reset(tp);
+
+	free_irq(spi->irq, tp);
+}
+
 static const struct acpi_device_id vsc_tp_acpi_ids[] = {
 	{ "INTC1009" }, /* Raptor Lake */
 	{ "INTC1058" }, /* Tiger Lake */
@@ -582,6 +595,7 @@ MODULE_DEVICE_TABLE(acpi, vsc_tp_acpi_ids);
 static struct spi_driver vsc_tp_driver = {
 	.probe = vsc_tp_probe,
 	.remove = vsc_tp_remove,
+	.shutdown = vsc_tp_shutdown,
 	.driver = {
 		.name = "vsc-tp",
 		.acpi_match_table = vsc_tp_acpi_ids,
-- 
2.34.1