linux-kernel - [PATCH v4 2/5] mei: vsc: Prevent timeout error with added delay post-firmware download

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Message-Id: <20240625081047.4178494-3-wentong.wu@intel.com>
Date: Tue, 25 Jun 2024 16:10:44 +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 v4 2/5] mei: vsc: Prevent timeout error with added delay post-firmware download

After completing the firmware download, the firmware requires some
time to become functional. This change introduces additional sleep
time before the first read operation to prevent a confusing timeout
error in vsc_tp_xfer().

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/platform-vsc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mei/platform-vsc.c b/drivers/misc/mei/platform-vsc.c
index 1ec65d87488a..d02f6e881139 100644
--- a/drivers/misc/mei/platform-vsc.c
+++ b/drivers/misc/mei/platform-vsc.c
@@ -28,8 +28,8 @@
 
 #define MEI_VSC_MAX_MSG_SIZE		512
 
-#define MEI_VSC_POLL_DELAY_US		(50 * USEC_PER_MSEC)
-#define MEI_VSC_POLL_TIMEOUT_US		(200 * USEC_PER_MSEC)
+#define MEI_VSC_POLL_DELAY_US		(100 * USEC_PER_MSEC)
+#define MEI_VSC_POLL_TIMEOUT_US		(400 * USEC_PER_MSEC)
 
 #define mei_dev_to_vsc_hw(dev)		((struct mei_vsc_hw *)((dev)->hw))
 
-- 
2.34.1