mei: vsc: Enhance IVSC chipset stability during warm reboot

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From: Wentong Wu <wentong.wu@xxxxxxxxx>

commit 07de60a46ae9c0583df1c644bae6d3b22d1d903d upstream.

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@xxxxxxxxxxxxxxx # for 6.8+
Signed-off-by: Wentong Wu <wentong.wu@xxxxxxxxx>
Tested-by: Jason Chen <jason.z.chen@xxxxxxxxx>
Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240625081047.4178494-2-wentong.wu@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 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 e6a98dba8a73..5f3195636e53 100644
--- a/drivers/misc/mei/vsc-tp.c
+++ b/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,
-- 
2.45.2



Patches currently in stable-queue which might be from wentong.wu@xxxxxxxxx are

queue-6.9/mei-vsc-enhance-ivsc-chipset-stability-during-warm-reboot.patch
queue-6.9/mei-vsc-prevent-timeout-error-with-added-delay-post-firmware-download.patch
queue-6.9/mei-vsc-utilize-the-appropriate-byte-order-swap-function.patch




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