This is a note to let you know that I've just added the patch titled
i2c: aspeed: Reset the i2c controller when timeout occurs
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-aspeed-reset-the-i2c-controller-when-timeout-occurs.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fee465150b458351b6d9b9f66084f3cc3022b88b Mon Sep 17 00:00:00 2001
From: Tommy Huang <tommy_huang@xxxxxxxxxxxxxx>
Date: Wed, 6 Sep 2023 08:49:10 +0800
Subject: i2c: aspeed: Reset the i2c controller when timeout occurs
From: Tommy Huang <tommy_huang@xxxxxxxxxxxxxx>
commit fee465150b458351b6d9b9f66084f3cc3022b88b upstream.
Reset the i2c controller when an i2c transfer timeout occurs.
The remaining interrupts and device should be reset to avoid
unpredictable controller behavior.
Fixes: 2e57b7cebb98 ("i2c: aspeed: Add multi-master use case support")
Cc: <stable@xxxxxxxxxxxxxxx> # v5.1+
Signed-off-by: Tommy Huang <tommy_huang@xxxxxxxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-aspeed.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -693,13 +693,16 @@ static int aspeed_i2c_master_xfer(struct
if (time_left == 0) {
/*
- * If timed out and bus is still busy in a multi master
- * environment, attempt recovery at here.
+ * In a multi-master setup, if a timeout occurs, attempt
+ * recovery. But if the bus is idle, we still need to reset the
+ * i2c controller to clear the remaining interrupts.
*/
if (bus->multi_master &&
(readl(bus->base + ASPEED_I2C_CMD_REG) &
ASPEED_I2CD_BUS_BUSY_STS))
aspeed_i2c_recover_bus(bus);
+ else
+ aspeed_i2c_reset(bus);
/*
* If timed out and the state is still pending, drop the pending
Patches currently in stable-queue which might be from tommy_huang@xxxxxxxxxxxxxx are
queue-5.15/i2c-aspeed-reset-the-i2c-controller-when-timeout-occurs.patch
