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: Jae Hyun Yoo jae.hyun.yoo@linux.intel.com Cc: stable@vger.kernel.org # v5.1+
Signed-off-by: Tommy Huang tommy_huang@aspeedtech.com --- drivers/i2c/busses/i2c-aspeed.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index 2e5acfeb76c8..5a416b39b818 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -698,13 +698,16 @@ static int aspeed_i2c_master_xfer(struct i2c_adapter *adap,
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
Hi Tommy,
Thanks for fixing what I asked, I'm going to review here:
Reviewed-by: Andi Shyti andi.shyti@kernel.org
But still there are 3 things I will ask you for your next patches:
1. Please add a version to the patch, this is patch version 2, so that the title should be "[PATCH v2] i2c...."
You can have that with git-format-patch:
git format-patch -v 2 ....
On Mon, Sep 04, 2023 at 09:25:05AM +0800, Tommy Huang wrote:
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: Jae Hyun Yoo jae.hyun.yoo@linux.intel.com Cc: stable@vger.kernel.org # v5.1+
Signed-off-by: Tommy Huang tommy_huang@aspeedtech.com
2. Don't leave blank lines between tags. But I think Wolfram can fix this before pushing.
3. After the '---' it comes the freedom of speach section where you can write anything. Please add the changelog, something like:
v1 -> v2 - Fixed comment... - Fixed commit log... - etc.
This is important for reviewers in order to understand what has changed from patch v1 to patch v2.
Please, before your next patch, read first the Documentation/process/submitting-patches.rst document.
Thanks, Andi
drivers/i2c/busses/i2c-aspeed.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index 2e5acfeb76c8..5a416b39b818 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -698,13 +698,16 @@ static int aspeed_i2c_master_xfer(struct i2c_adapter *adap, 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
*/ if (bus->multi_master && (readl(bus->base + ASPEED_I2C_CMD_REG) & ASPEED_I2CD_BUS_BUSY_STS)) aspeed_i2c_recover_bus(bus);* i2c controller to clear the remaining interrupts.
else
aspeed_i2c_reset(bus);
/* * If timed out and the state is still pending, drop the pending -- 2.25.1
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