This is a note to let you know that I've just added the patch titled
i2c: aspeed: Fix i2c bus hang in slave read
to the 6.5-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-fix-i2c-bus-hang-in-slave-read.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 54f1840ddee9bbdc8dd89fbbfdfa632401244146 Mon Sep 17 00:00:00 2001
From: Jian Zhang <zhangjian.3032@xxxxxxxxxxxxx>
Date: Fri, 6 Oct 2023 10:22:33 +0800
Subject: i2c: aspeed: Fix i2c bus hang in slave read
From: Jian Zhang <zhangjian.3032@xxxxxxxxxxxxx>
commit 54f1840ddee9bbdc8dd89fbbfdfa632401244146 upstream.
When the `CONFIG_I2C_SLAVE` option is enabled and the device operates
as a slave, a situation arises where the master sends a START signal
without the accompanying STOP signal. This action results in a
persistent I2C bus timeout. The core issue stems from the fact that
the i2c controller remains in a slave read state without a timeout
mechanism. As a consequence, the bus perpetually experiences timeouts.
In this case, the i2c bus will be reset, but the slave_state reset is
missing.
Fixes: fee465150b45 ("i2c: aspeed: Reset the i2c controller when timeout occurs")
Signed-off-by: Jian Zhang <zhangjian.3032@xxxxxxxxxxxxx>
Acked-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Tested-by: Andrew Jeffery <andrew@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Andrew Jeffery <andrew@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-aspeed.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -749,6 +749,8 @@ static void __aspeed_i2c_reg_slave(struc
func_ctrl_reg_val = readl(bus->base + ASPEED_I2C_FUN_CTRL_REG);
func_ctrl_reg_val |= ASPEED_I2CD_SLAVE_EN;
writel(func_ctrl_reg_val, bus->base + ASPEED_I2C_FUN_CTRL_REG);
+
+ bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE;
}
static int aspeed_i2c_reg_slave(struct i2c_client *client)
@@ -765,7 +767,6 @@ static int aspeed_i2c_reg_slave(struct i
__aspeed_i2c_reg_slave(bus, client->addr);
bus->slave = client;
- bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE;
spin_unlock_irqrestore(&bus->lock, flags);
return 0;
Patches currently in stable-queue which might be from zhangjian.3032@xxxxxxxxxxxxx are
queue-6.5/i2c-aspeed-fix-i2c-bus-hang-in-slave-read.patch
