i2c: aspeed: Fix i2c bus hang in slave read
authorJian Zhang <zhangjian.3032@bytedance.com>
Fri, 6 Oct 2023 02:22:33 +0000 (10:22 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 2 Nov 2023 08:35:30 +0000 (09:35 +0100)
commit91b95e3b4ac8ae55ce0bea8f52131b755b918a12
treee58898aef660cdcf432a53f40b7f9a5e1d859ce2
parent11602cadc9b40e9cceab517640c6c0db3d24252e
i2c: aspeed: Fix i2c bus hang in slave read

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@bytedance.com>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Tested-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Reviewed-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/i2c/busses/i2c-aspeed.c