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: 566f5ca ("mei: Add transport driver for IVSC device")
Cc: [email protected] # for 6.8+
Signed-off-by: Wentong Wu <[email protected]>
Tested-by: Jason Chen <[email protected]>
Acked-by: Sakari Ailus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: wentongwu

drivers/misc/mei/vsc-tp.c

@@ -568,6 +568,19 @@ 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 */
@@ -580,6 +593,7 @@ 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,