5.4-stable review patch. If anyone has any objections, please let me know.
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From: Jian Zhang zhangjian.3032@bytedance.com
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 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -740,6 +740,8 @@ 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) @@ -756,7 +758,6 @@ 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;