On 15-09-23 07:27 pm, Heikki Krogerus wrote:
Hi Prashanth,
On Fri, Sep 15, 2023 at 07:10:25PM +0530, Prashanth K wrote:
On 15-09-23 06:02 pm, Heikki Krogerus wrote:
On Tue, Sep 12, 2023 at 04:37:47PM +0530, Prashanth K wrote:
On 11-09-23 06:19 pm, Heikki Krogerus wrote:
On Mon, Sep 11, 2023 at 02:34:15PM +0530, Prashanth K wrote:
Currently if ucsi_send_command() fails, then we bail out without
clearing EVENT_PENDING flag. So when the next connector change
event comes, ucsi_connector_change() won't queue the con->work,
because of which none of the new events will be processed.
Fix this by clearing EVENT_PENDING flag if ucsi_send_command()
fails.
Cc: <stable@xxxxxxxxxxxxxxx> # 5.16
Fixes: 512df95b9432 ("usb: typec: ucsi: Better fix for missing unplug events issue")
Signed-off-by: Prashanth K <quic_prashk@xxxxxxxxxxx>
---
drivers/usb/typec/ucsi/ucsi.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index c6dfe3d..509c67c 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -884,6 +884,7 @@ static void ucsi_handle_connector_change(struct work_struct *work)
if (ret < 0) {
dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
__func__, ret);
+ clear_bit(EVENT_PENDING, &con->ucsi->flags);
goto out_unlock;
}
I think it would be better to just move that label (out_unlock) above
the point where clear_bit() is already called instead of separately
calling it like that. That way the Connector Change Event will
also get acknowledged.
Do we really need to ACK in this case since we didn't process the current
connector change event
You won't get the next event before the first one was ACK'd, right?
The spec says that we need to ACK if we received AND processed a CCI
"4.5.4 Acknowledge Command Completion and/or Change Indication (R)
This command is used to acknowledge to the PPM that the OPM received and
processed a Command Completion and/or a Connector Change Indication."
And here in this case, we have received, but not processed the event.
So I'm not really sure what to do here in this case. If we don't send an
ACK, then would the PPM think that OPM is not responding and reset it?
OR would it resend the previous event again since we didn't ACK?
Every PPM behaves differently.
Did you actually see that happening - GET_CONNECTOR_STATUS failed? Can
you reproduce it?
Yea we actually hit the issue once where GET_CONNECTOR_STATUS failed and
subsequent events didn't get queued since EVENT_PENDING wasn't cleared.
Its not easily reproducible (<1%) though.
[4948:kworker/0:3]UCSI: ucsi_qti_glink_write: timed out
[4948:kworker/0:3]ucsi_glink soc:qcom,pmic_glink:qcom,ucsi:
ucsi_handle_connector_change: GET_CONNECTOR_STATUS failed (-110)
Regards,
Prashanth K
