linux-kernel - [PATCH 5.18 0122/1095] usb: typec: ucsi: Acknowledge the GET_ERROR

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Message-Id: <20220815180434.641471278@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:52:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jack Pham <quic_jackp@...cinc.com>,
        Linyu Yuan <quic_linyyuan@...cinc.com>
Subject: [PATCH 5.18 0122/1095] usb: typec: ucsi: Acknowledge the GET_ERROR_STATUS command completion

From: Linyu Yuan <quic_linyyuan@...cinc.com>

commit a7dc438b5e446afcd1b3b6651da28271400722f2 upstream.

We found PPM will not send any notification after it report error status
and OPM issue GET_ERROR_STATUS command to read the details about error.

According UCSI spec, PPM may clear the Error Status Data after the OPM
has acknowledged the command completion.

This change add operation to acknowledge the command completion from PPM.

Fixes: bdc62f2bae8f (usb: typec: ucsi: Simplified registration and I/O API)
Cc: <stable@...r.kernel.org> # 5.10
Signed-off-by: Jack Pham <quic_jackp@...cinc.com>
Signed-off-by: Linyu Yuan <quic_linyyuan@...cinc.com>
Link: https://lore.kernel.org/r/1658817949-4632-1-git-send-email-quic_linyyuan@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/typec/ucsi/ucsi.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -76,6 +76,10 @@ static int ucsi_read_error(struct ucsi *
 	if (ret)
 		return ret;
 
+	ret = ucsi_acknowledge_command(ucsi);
+	if (ret)
+		return ret;
+
 	switch (error) {
 	case UCSI_ERROR_INCOMPATIBLE_PARTNER:
 		return -EOPNOTSUPP;