linux-kernel - [PATCH 1/6] mei: vsc: Enhance IVSC chipset reset toggling

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Message-Id: <20240623093056.4169438-2-wentong.wu@intel.com>
Date: Sun, 23 Jun 2024 17:30:51 +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 1/6] mei: vsc: Enhance IVSC chipset reset toggling

Implementing the hardware recommendation to toggle the chipset reset.

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 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/mei/vsc-tp.c b/drivers/misc/mei/vsc-tp.c
index e6a98dba8a73..dcab5174bf00 100644
--- a/drivers/misc/mei/vsc-tp.c
+++ b/drivers/misc/mei/vsc-tp.c
@@ -350,6 +350,8 @@ void vsc_tp_reset(struct vsc_tp *tp)
 	disable_irq(tp->spi->irq);
 
 	/* toggle reset pin */
+	gpiod_set_value_cansleep(tp->resetfw, 1);
+	msleep(VSC_TP_RESET_PIN_TOGGLE_INTERVAL_MS);
 	gpiod_set_value_cansleep(tp->resetfw, 0);
 	msleep(VSC_TP_RESET_PIN_TOGGLE_INTERVAL_MS);
 	gpiod_set_value_cansleep(tp->resetfw, 1);
-- 
2.34.1