4.19-stable review patch. If anyone has any objections, please let me know.
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From: Tommy Huang tommy_huang@aspeedtech.com
commit 93701d3b84ac5f3ea07259d4ced405c53d757985 upstream.
When the i2c bus recovery occurs, driver will send i2c stop command in the scl low condition. In this case the sw state will still keep original situation. Under multi-master usage, i2c bus recovery will be called when i2c transfer timeout occurs. Update the stop command calling with aspeed_i2c_do_stop function to update master_state.
Fixes: f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C") Cc: stable@vger.kernel.org # v4.13+ Signed-off-by: Tommy Huang tommy_huang@aspeedtech.com Signed-off-by: Andi Shyti andi.shyti@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/i2c/busses/i2c-aspeed.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
--- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -159,6 +159,13 @@ struct aspeed_i2c_bus {
static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus);
+/* precondition: bus.lock has been acquired. */ +static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus) +{ + bus->master_state = ASPEED_I2C_MASTER_STOP; + writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG); +} + static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus) { unsigned long time_left, flags; @@ -176,7 +183,7 @@ static int aspeed_i2c_recover_bus(struct command);
reinit_completion(&bus->cmd_complete); - writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG); + aspeed_i2c_do_stop(bus); spin_unlock_irqrestore(&bus->lock, flags);
time_left = wait_for_completion_timeout( @@ -351,13 +358,6 @@ static void aspeed_i2c_do_start(struct a }
/* precondition: bus.lock has been acquired. */ -static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus) -{ - bus->master_state = ASPEED_I2C_MASTER_STOP; - writel(ASPEED_I2CD_M_STOP_CMD, bus->base + ASPEED_I2C_CMD_REG); -} - -/* precondition: bus.lock has been acquired. */ static void aspeed_i2c_next_msg_or_stop(struct aspeed_i2c_bus *bus) { if (bus->msgs_index + 1 < bus->msgs_count) {