[PATCH v2 00/10] platform/chrome: Kunit tests and refactor for cros_ec_cmd_xfer()

[PATCH v2 00/10] platform/chrome: Kunit tests and refactor for cros_ec_cmd_xfer()

[Tzung-Bi Shih]

The 1st patch fixes an issue that cros_kunit_ec_xfer_mock() could return
garbage bytes for `msg->result` if the mock list is empty.

The 2nd ~ 6th patches add Kunit tests and refactors for cros_ec_cmd_xfer().

The last 4 patches change the behavior a bit by altering return codes.


Asynchronous mechanism in EC protocol:
EC returns EC_RES_IN_PROGRESS if the host command needs more time to
complete.  It saves the result into `saved_result` once the command
completed[1].

By design, AP should send another command EC_CMD_RESEND_RESPONSE for
getting the result from the previous pending command[2].  The mechanism
was only designed for commands that don't need responses[3].

However, the kernel code doesn't have such logic when dealing with
EC_RES_IN_PROGRESS.

The series doesn't fix it but leave it as is.  I doubt there is no existing
use case.

[1]: https://crrev.com/9b80051e01872d8cae86fff999b5d31a0bea985b/common/host_command.c#113
[2]: https://crrev.com/9b80051e01872d8cae86fff999b5d31a0bea985b/common/host_command.c#748
[3]: https://crrev.com/9b80051e01872d8cae86fff999b5d31a0bea985b/common/host_command.c#126


Return value overridden in cros_ec_send_command() if asynchronous:
By original intention, cros_ec_send_command() returns number of available
bytes of input payload.

When it falls into asynchronous path (i.e. EC_RES_IN_PROGRESS), both return
value and `msg->result` will be overridden by the subsequent
EC_CMD_GET_COMMS_STATUS.

The series doesn't fix it but leave it as is.

Tzung-Bi Shih (10):
  platform/chrome: cros_kunit_util: add default value for `msg->result`
  platform/chrome: cros_ec_proto: add "cros_ec_" prefix to
    send_command()
  platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_cmd_xfer()
  platform/chrome: cros_ec_proto: add Kunit tests for
    cros_ec_send_command()
  platform/chrome: cros_ec_proto: separate cros_ec_xfer_command()
  platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete()
  platform/chrome: cros_ec_proto: change Kunit expectation when timed
    out
  platform/chrome: cros_ec_proto: return -EAGAIN when retries timed out
  platform/chrome: cros_ec_proto: add Kunit test for empty payload
  platform/chrome: cros_ec_proto: return -EPROTO if empty payload

 drivers/platform/chrome/cros_ec_proto.c      | 102 +++--
 drivers/platform/chrome/cros_ec_proto_test.c | 443 +++++++++++++++++++
 drivers/platform/chrome/cros_kunit_util.c    |  27 +-
 drivers/platform/chrome/cros_kunit_util.h    |   5 +
 4 files changed, 530 insertions(+), 47 deletions(-)

Changes from v1 (https://patchwork.kernel.org/project/chrome-platform/cover/20220628024913.1755292-1-tzungbi@kernel.org/):
- Drop "platform/chrome: cros_ec_proto: change Kunit expectation for EC errors"
  and "platform/chrome: cros_ec_proto: return standard error codes for EC
  errors" because they could break existing ABI.
- Add "platform/chrome: cros_kunit_util: add default value for `msg->result`".

-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`

[Tzung-Bi Shih]

Add default value for `msg->result` so that it won't be garbage bytes
when the mock list is empty.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
No v1.  New in the series.

 drivers/platform/chrome/cros_kunit_util.c | 7 ++++++-
 drivers/platform/chrome/cros_kunit_util.h | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_kunit_util.c b/drivers/platform/chrome/cros_kunit_util.c
index e031777dea87..6810d558d462 100644
--- a/drivers/platform/chrome/cros_kunit_util.c
+++ b/drivers/platform/chrome/cros_kunit_util.c
@@ -13,6 +13,8 @@
 #include "cros_ec.h"
 #include "cros_kunit_util.h"
 
+int cros_kunit_ec_xfer_mock_default_result;
+EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);
 int cros_kunit_ec_xfer_mock_default_ret;
 EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);
 
@@ -24,8 +26,10 @@ int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_comman
 	struct ec_xfer_mock *mock;
 
 	mock = list_first_entry_or_null(&cros_kunit_ec_xfer_mock_in, struct ec_xfer_mock, list);
-	if (!mock)
+	if (!mock) {
+		msg->result = cros_kunit_ec_xfer_mock_default_result;
 		return cros_kunit_ec_xfer_mock_default_ret;
+	}
 
 	list_del(&mock->list);
 
@@ -89,6 +93,7 @@ EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_next);
 
 void cros_kunit_mock_reset(void)
 {
+	cros_kunit_ec_xfer_mock_default_result = 0;
 	cros_kunit_ec_xfer_mock_default_ret = 0;
 	INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_in);
 	INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_out);
diff --git a/drivers/platform/chrome/cros_kunit_util.h b/drivers/platform/chrome/cros_kunit_util.h
index 79c4525f873c..79c4f259f2bb 100644
--- a/drivers/platform/chrome/cros_kunit_util.h
+++ b/drivers/platform/chrome/cros_kunit_util.h
@@ -23,6 +23,7 @@ struct ec_xfer_mock {
 	u32 o_data_len;
 };
 
+extern int cros_kunit_ec_xfer_mock_default_result;
 extern int cros_kunit_ec_xfer_mock_default_ret;
 
 int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg);
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 02/10] platform/chrome: cros_ec_proto: add "cros_ec_" prefix to send_command()

[Tzung-Bi Shih]

To be neat, add "cros_ec_" prefix to static function send_command().

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 6923ea4401e5..b02fd1414e52 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -107,8 +107,7 @@ static int prepare_tx_legacy(struct cros_ec_device *ec_dev,
 	return EC_MSG_TX_PROTO_BYTES + msg->outsize;
 }
 
-static int send_command(struct cros_ec_device *ec_dev,
-			struct cros_ec_command *msg)
+static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
 {
 	int ret;
 	int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
@@ -255,7 +254,7 @@ static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev, uint3
 	msg->command = EC_CMD_HOST_EVENT_GET_WAKE_MASK;
 	msg->insize = sizeof(*r);
 
-	ret = send_command(ec_dev, msg);
+	ret = cros_ec_send_command(ec_dev, msg);
 	if (ret < 0)
 		goto exit;
 
@@ -295,7 +294,7 @@ static int cros_ec_get_proto_info(struct cros_ec_device *ec_dev, int devidx)
 	msg->command = EC_CMD_PASSTHRU_OFFSET(devidx) | EC_CMD_GET_PROTOCOL_INFO;
 	msg->insize = sizeof(*info);
 
-	ret = send_command(ec_dev, msg);
+	ret = cros_ec_send_command(ec_dev, msg);
 	/*
 	 * Send command once again when timeout occurred.
 	 * Fingerprint MCU (FPMCU) is restarted during system boot which
@@ -304,7 +303,7 @@ static int cros_ec_get_proto_info(struct cros_ec_device *ec_dev, int devidx)
 	 * attempt because we waited at least EC_MSG_DEADLINE_MS.
 	 */
 	if (ret == -ETIMEDOUT)
-		ret = send_command(ec_dev, msg);
+		ret = cros_ec_send_command(ec_dev, msg);
 
 	if (ret < 0) {
 		dev_dbg(ec_dev->dev,
@@ -376,7 +375,7 @@ static int cros_ec_get_proto_info_legacy(struct cros_ec_device *ec_dev)
 	params = (struct ec_params_hello *)msg->data;
 	params->in_data = 0xa0b0c0d0;
 
-	ret = send_command(ec_dev, msg);
+	ret = cros_ec_send_command(ec_dev, msg);
 	if (ret < 0) {
 		dev_dbg(ec_dev->dev, "EC failed to respond to v2 hello: %d\n", ret);
 		goto exit;
@@ -453,7 +452,7 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
 	pver = (struct ec_params_get_cmd_versions *)msg->data;
 	pver->cmd = cmd;
 
-	ret = send_command(ec_dev, msg);
+	ret = cros_ec_send_command(ec_dev, msg);
 	if (ret < 0)
 		goto exit;
 
@@ -634,7 +633,7 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
 		}
 	}
 
-	ret = send_command(ec_dev, msg);
+	ret = cros_ec_send_command(ec_dev, msg);
 	mutex_unlock(&ec_dev->lock);
 
 	return ret;
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 03/10] platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_cmd_xfer()

[Tzung-Bi Shih]

cros_ec_cmd_xfer() transfers the given command and data if any.  It
performs some sanity checks and calls cros_ec_send_command().

Add Kunit tests for cros_ec_cmd_xfer().

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto_test.c | 149 +++++++++++++++++++
 1 file changed, 149 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
index 1e2a1522c288..33721607a5b9 100644
--- a/drivers/platform/chrome/cros_ec_proto_test.c
+++ b/drivers/platform/chrome/cros_ec_proto_test.c
@@ -1535,6 +1535,151 @@ static void cros_ec_proto_test_query_all_default_wake_mask_return0(struct kunit
 	}
 }
 
+static void cros_ec_proto_test_cmd_xfer_normal(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct {
+		struct cros_ec_command msg;
+		u8 data[0x100];
+	} __packed buf;
+
+	ec_dev->max_request = 0xff;
+	ec_dev->max_response = 0xee;
+	ec_dev->max_passthru = 0xdd;
+
+	buf.msg.version = 0;
+	buf.msg.command = EC_CMD_HELLO;
+	buf.msg.insize = 4;
+	buf.msg.outsize = 2;
+	buf.data[0] = 0x55;
+	buf.data[1] = 0xaa;
+
+	{
+		u8 *data;
+
+		mock = cros_kunit_ec_xfer_mock_add(test, 4);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+
+		data = (u8 *)mock->o_data;
+		data[0] = 0xaa;
+		data[1] = 0x55;
+		data[2] = 0xcc;
+		data[3] = 0x33;
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	KUNIT_EXPECT_EQ(test, ret, 4);
+
+	{
+		u8 *data;
+
+		mock = cros_kunit_ec_xfer_mock_next();
+		KUNIT_EXPECT_PTR_NE(test, mock, NULL);
+
+		KUNIT_EXPECT_EQ(test, mock->msg.version, 0);
+		KUNIT_EXPECT_EQ(test, mock->msg.command, EC_CMD_HELLO);
+		KUNIT_EXPECT_EQ(test, mock->msg.insize, 4);
+		KUNIT_EXPECT_EQ(test, mock->msg.outsize, 2);
+
+		data = (u8 *)mock->i_data;
+		KUNIT_EXPECT_EQ(test, data[0], 0x55);
+		KUNIT_EXPECT_EQ(test, data[1], 0xaa);
+
+		KUNIT_EXPECT_EQ(test, buf.data[0], 0xaa);
+		KUNIT_EXPECT_EQ(test, buf.data[1], 0x55);
+		KUNIT_EXPECT_EQ(test, buf.data[2], 0xcc);
+		KUNIT_EXPECT_EQ(test, buf.data[3], 0x33);
+	}
+}
+
+static void cros_ec_proto_test_cmd_xfer_excess_msg_insize(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct {
+		struct cros_ec_command msg;
+		u8 data[0x100];
+	} __packed buf;
+
+	ec_dev->max_request = 0xff;
+	ec_dev->max_response = 0xee;
+	ec_dev->max_passthru = 0xdd;
+
+	buf.msg.version = 0;
+	buf.msg.command = EC_CMD_HELLO;
+	buf.msg.insize = 0xee + 1;
+	buf.msg.outsize = 2;
+
+	{
+		mock = cros_kunit_ec_xfer_mock_add(test, 0xcc);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	KUNIT_EXPECT_EQ(test, ret, 0xcc);
+
+	{
+		mock = cros_kunit_ec_xfer_mock_next();
+		KUNIT_EXPECT_PTR_NE(test, mock, NULL);
+
+		KUNIT_EXPECT_EQ(test, mock->msg.version, 0);
+		KUNIT_EXPECT_EQ(test, mock->msg.command, EC_CMD_HELLO);
+		KUNIT_EXPECT_EQ(test, mock->msg.insize, 0xee);
+		KUNIT_EXPECT_EQ(test, mock->msg.outsize, 2);
+	}
+}
+
+static void cros_ec_proto_test_cmd_xfer_excess_msg_outsize_without_passthru(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	int ret;
+	struct {
+		struct cros_ec_command msg;
+		u8 data[0x100];
+	} __packed buf;
+
+	ec_dev->max_request = 0xff;
+	ec_dev->max_response = 0xee;
+	ec_dev->max_passthru = 0xdd;
+
+	buf.msg.version = 0;
+	buf.msg.command = EC_CMD_HELLO;
+	buf.msg.insize = 4;
+	buf.msg.outsize = 0xff + 1;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	KUNIT_EXPECT_EQ(test, ret, -EMSGSIZE);
+}
+
+static void cros_ec_proto_test_cmd_xfer_excess_msg_outsize_with_passthru(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	int ret;
+	struct {
+		struct cros_ec_command msg;
+		u8 data[0x100];
+	} __packed buf;
+
+	ec_dev->max_request = 0xff;
+	ec_dev->max_response = 0xee;
+	ec_dev->max_passthru = 0xdd;
+
+	buf.msg.version = 0;
+	buf.msg.command = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX) + EC_CMD_HELLO;
+	buf.msg.insize = 4;
+	buf.msg.outsize = 0xdd + 1;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	KUNIT_EXPECT_EQ(test, ret, -EMSGSIZE);
+}
+
 static void cros_ec_proto_test_release(struct device *dev)
 {
 }
@@ -1601,6 +1746,10 @@ static struct kunit_case cros_ec_proto_test_cases[] = {
 	KUNIT_CASE(cros_ec_proto_test_query_all_no_host_sleep_return0),
 	KUNIT_CASE(cros_ec_proto_test_query_all_default_wake_mask_return_error),
 	KUNIT_CASE(cros_ec_proto_test_query_all_default_wake_mask_return0),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_normal),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_excess_msg_insize),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_excess_msg_outsize_without_passthru),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_excess_msg_outsize_with_passthru),
 	{}
 };
 
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 04/10] platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_send_command()

[Tzung-Bi Shih]

cros_ec_cmd_xfer() is the only exported function that calls static
function cros_ec_send_command().

Add Kunit tests for cros_ec_send_command() through calling
cros_ec_cmd_xfer().

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto_test.c | 265 +++++++++++++++++++
 drivers/platform/chrome/cros_kunit_util.c    |  20 ++
 drivers/platform/chrome/cros_kunit_util.h    |   4 +
 3 files changed, 289 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
index 33721607a5b9..64100fd81c6a 100644
--- a/drivers/platform/chrome/cros_ec_proto_test.c
+++ b/drivers/platform/chrome/cros_ec_proto_test.c
@@ -1680,6 +1680,262 @@ static void cros_ec_proto_test_cmd_xfer_excess_msg_outsize_with_passthru(struct
 	KUNIT_EXPECT_EQ(test, ret, -EMSGSIZE);
 }
 
+static void cros_ec_proto_test_cmd_xfer_protocol_v3_normal(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->proto_version = 3;
+	ec_dev->cmd_xfer = cros_kunit_ec_cmd_xfer_mock;
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_cmd_xfer_mock_called, 0);
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 1);
+}
+
+static void cros_ec_proto_test_cmd_xfer_protocol_v3_no_op(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->proto_version = 3;
+	ec_dev->cmd_xfer = cros_kunit_ec_cmd_xfer_mock;
+	ec_dev->pkt_xfer = NULL;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, -EIO);
+}
+
+static void cros_ec_proto_test_cmd_xfer_protocol_v2_normal(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->proto_version = 2;
+	ec_dev->cmd_xfer = cros_kunit_ec_cmd_xfer_mock;
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_cmd_xfer_mock_called, 1);
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 0);
+}
+
+static void cros_ec_proto_test_cmd_xfer_protocol_v2_no_op(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->proto_version = 2;
+	ec_dev->cmd_xfer = NULL;
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, -EIO);
+}
+
+static void cros_ec_proto_test_cmd_xfer_in_progress_normal(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS. */
+	{
+		struct ec_response_get_comms_status *data;
+
+		mock = cros_kunit_ec_xfer_mock_add(test, sizeof(*data));
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+
+		data = (struct ec_response_get_comms_status *)mock->o_data;
+		data->flags = 0;
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, sizeof(struct ec_response_get_comms_status));
+
+	KUNIT_EXPECT_EQ(test, msg.result, EC_RES_SUCCESS);
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_next();
+		KUNIT_EXPECT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_next();
+		KUNIT_EXPECT_PTR_NE(test, mock, NULL);
+
+		KUNIT_EXPECT_EQ(test, mock->msg.version, 0);
+		KUNIT_EXPECT_EQ(test, mock->msg.command, EC_CMD_GET_COMMS_STATUS);
+		KUNIT_EXPECT_EQ(test, mock->msg.insize,
+				sizeof(struct ec_response_get_comms_status));
+		KUNIT_EXPECT_EQ(test, mock->msg.outsize, 0);
+	}
+
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 2);
+}
+
+static void cros_ec_proto_test_cmd_xfer_in_progress_retries_eagain(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS EC_COMMAND_RETRIES times. */
+	cros_kunit_ec_xfer_mock_default_ret = -EAGAIN;
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, -EAGAIN);
+
+	/* For EC_CMD_GET_COMMS_STATUS EC_COMMAND_RETRIES times. */
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 51);
+}
+
+static void cros_ec_proto_test_cmd_xfer_in_progress_retries_status_processing(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS EC_COMMAND_RETRIES times. */
+	{
+		struct ec_response_get_comms_status *data;
+		int i;
+
+		for (i = 0; i < 50; ++i) {
+			mock = cros_kunit_ec_xfer_mock_add(test, sizeof(*data));
+			KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+
+			data = (struct ec_response_get_comms_status *)mock->o_data;
+			data->flags |= EC_COMMS_STATUS_PROCESSING;
+		}
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, sizeof(struct ec_response_get_comms_status));
+
+	KUNIT_EXPECT_EQ(test, msg.result, EC_RES_SUCCESS);
+
+	/* For EC_CMD_GET_COMMS_STATUS EC_COMMAND_RETRIES times. */
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 51);
+}
+
+static void cros_ec_proto_test_cmd_xfer_in_progress_xfer_error(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, -EIO, EC_RES_SUCCESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, -EIO);
+}
+
+static void cros_ec_proto_test_cmd_xfer_in_progress_return_error(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_INVALID_COMMAND, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, msg.result, EC_RES_INVALID_COMMAND);
+
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 2);
+}
+
 static void cros_ec_proto_test_release(struct device *dev)
 {
 }
@@ -1750,6 +2006,15 @@ static struct kunit_case cros_ec_proto_test_cases[] = {
 	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_excess_msg_insize),
 	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_excess_msg_outsize_without_passthru),
 	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_excess_msg_outsize_with_passthru),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_protocol_v3_normal),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_protocol_v3_no_op),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_protocol_v2_normal),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_protocol_v2_no_op),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_normal),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_retries_eagain),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_retries_status_processing),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_xfer_error),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_return_error),
 	{}
 };
 
diff --git a/drivers/platform/chrome/cros_kunit_util.c b/drivers/platform/chrome/cros_kunit_util.c
index 6810d558d462..e6a0a1b4ed4b 100644
--- a/drivers/platform/chrome/cros_kunit_util.c
+++ b/drivers/platform/chrome/cros_kunit_util.c
@@ -17,6 +17,10 @@ int cros_kunit_ec_xfer_mock_default_result;
 EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);
 int cros_kunit_ec_xfer_mock_default_ret;
 EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);
+int cros_kunit_ec_cmd_xfer_mock_called;
+EXPORT_SYMBOL_GPL(cros_kunit_ec_cmd_xfer_mock_called);
+int cros_kunit_ec_pkt_xfer_mock_called;
+EXPORT_SYMBOL_GPL(cros_kunit_ec_pkt_xfer_mock_called);
 
 static struct list_head cros_kunit_ec_xfer_mock_in;
 static struct list_head cros_kunit_ec_xfer_mock_out;
@@ -50,6 +54,20 @@ int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_comman
 }
 EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock);
 
+int cros_kunit_ec_cmd_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+	++cros_kunit_ec_cmd_xfer_mock_called;
+	return cros_kunit_ec_xfer_mock(ec_dev, msg);
+}
+EXPORT_SYMBOL_GPL(cros_kunit_ec_cmd_xfer_mock);
+
+int cros_kunit_ec_pkt_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+	++cros_kunit_ec_pkt_xfer_mock_called;
+	return cros_kunit_ec_xfer_mock(ec_dev, msg);
+}
+EXPORT_SYMBOL_GPL(cros_kunit_ec_pkt_xfer_mock);
+
 struct ec_xfer_mock *cros_kunit_ec_xfer_mock_add(struct kunit *test, size_t size)
 {
 	return cros_kunit_ec_xfer_mock_addx(test, size, EC_RES_SUCCESS, size);
@@ -95,6 +113,8 @@ void cros_kunit_mock_reset(void)
 {
 	cros_kunit_ec_xfer_mock_default_result = 0;
 	cros_kunit_ec_xfer_mock_default_ret = 0;
+	cros_kunit_ec_cmd_xfer_mock_called = 0;
+	cros_kunit_ec_pkt_xfer_mock_called = 0;
 	INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_in);
 	INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_out);
 }
diff --git a/drivers/platform/chrome/cros_kunit_util.h b/drivers/platform/chrome/cros_kunit_util.h
index 79c4f259f2bb..85e2974fd048 100644
--- a/drivers/platform/chrome/cros_kunit_util.h
+++ b/drivers/platform/chrome/cros_kunit_util.h
@@ -25,8 +25,12 @@ struct ec_xfer_mock {
 
 extern int cros_kunit_ec_xfer_mock_default_result;
 extern int cros_kunit_ec_xfer_mock_default_ret;
+extern int cros_kunit_ec_cmd_xfer_mock_called;
+extern int cros_kunit_ec_pkt_xfer_mock_called;
 
 int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg);
+int cros_kunit_ec_cmd_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg);
+int cros_kunit_ec_pkt_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg);
 struct ec_xfer_mock *cros_kunit_ec_xfer_mock_add(struct kunit *test, size_t size);
 struct ec_xfer_mock *cros_kunit_ec_xfer_mock_addx(struct kunit *test,
 						  int ret, int result, size_t size);
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 05/10] platform/chrome: cros_ec_proto: separate cros_ec_xfer_command()

[Tzung-Bi Shih]

cros_ec_send_command() has extra logic to handle EC_RES_IN_PROGRESS.
Separate the command transfer part into cros_ec_xfer_command() so
that other functions can re-use it.

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index b02fd1414e52..0cec013be3d3 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -107,7 +107,7 @@ static int prepare_tx_legacy(struct cros_ec_device *ec_dev,
 	return EC_MSG_TX_PROTO_BYTES + msg->outsize;
 }
 
-static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
 {
 	int ret;
 	int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
@@ -123,14 +123,21 @@ static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_co
 		 * the EC is trying to use protocol v2, on an underlying
 		 * communication mechanism that does not support v2.
 		 */
-		dev_err_once(ec_dev->dev,
-			     "missing EC transfer API, cannot send command\n");
+		dev_err_once(ec_dev->dev, "missing EC transfer API, cannot send command\n");
 		return -EIO;
 	}
 
 	trace_cros_ec_request_start(msg);
 	ret = (*xfer_fxn)(ec_dev, msg);
 	trace_cros_ec_request_done(msg, ret);
+
+	return ret;
+}
+
+static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+	int ret = cros_ec_xfer_command(ec_dev, msg);
+
 	if (msg->result == EC_RES_IN_PROGRESS) {
 		int i;
 		struct cros_ec_command *status_msg;
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 06/10] platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete()

[Tzung-Bi Shih]

EC returns EC_RES_IN_PROGRESS if the host command needs more time to
complete.  Whenever receives the return code, cros_ec_send_command()
sends EC_CMD_GET_COMMS_STATUS to query the command status.

Separate cros_ec_wait_until_complete() from cros_ec_send_command().
It sends EC_CMD_GET_COMMS_STATUS and waits until the previous command
was completed, or encountered error, or timed out.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Allocate buffer in cros_ec_wait_until_complete() statically.
- Use `return ret` instead of `break` to make the intent explicit.

 drivers/platform/chrome/cros_ec_proto.c | 74 ++++++++++++-------------
 1 file changed, 35 insertions(+), 39 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 0cec013be3d3..a6ad7f7956e6 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -134,56 +134,52 @@ static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_co
 	return ret;
 }
 
-static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *result)
 {
-	int ret = cros_ec_xfer_command(ec_dev, msg);
+	struct {
+		struct cros_ec_command msg;
+		struct ec_response_get_comms_status status;
+	} __packed buf;
+	struct cros_ec_command *msg = &buf.msg;
+	struct ec_response_get_comms_status *status = &buf.status;
+	int ret = 0, i;
 
-	if (msg->result == EC_RES_IN_PROGRESS) {
-		int i;
-		struct cros_ec_command *status_msg;
-		struct ec_response_get_comms_status *status;
+	msg->version = 0;
+	msg->command = EC_CMD_GET_COMMS_STATUS;
+	msg->insize = sizeof(*status);
+	msg->outsize = 0;
 
-		status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status),
-				     GFP_KERNEL);
-		if (!status_msg)
-			return -ENOMEM;
+	/* Query the EC's status until it's no longer busy or we encounter an error. */
+	for (i = 0; i < EC_COMMAND_RETRIES; ++i) {
+		usleep_range(10000, 11000);
 
-		status_msg->version = 0;
-		status_msg->command = EC_CMD_GET_COMMS_STATUS;
-		status_msg->insize = sizeof(*status);
-		status_msg->outsize = 0;
+		ret = cros_ec_xfer_command(ec_dev, msg);
+		if (ret == -EAGAIN)
+			continue;
+		if (ret < 0)
+			return ret;
 
-		/*
-		 * Query the EC's status until it's no longer busy or
-		 * we encounter an error.
-		 */
-		for (i = 0; i < EC_COMMAND_RETRIES; i++) {
-			usleep_range(10000, 11000);
-
-			trace_cros_ec_request_start(status_msg);
-			ret = (*xfer_fxn)(ec_dev, status_msg);
-			trace_cros_ec_request_done(status_msg, ret);
-			if (ret == -EAGAIN)
-				continue;
-			if (ret < 0)
-				break;
-
-			msg->result = status_msg->result;
-			if (status_msg->result != EC_RES_SUCCESS)
-				break;
-
-			status = (struct ec_response_get_comms_status *)
-				 status_msg->data;
-			if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
-				break;
-		}
+		*result = msg->result;
+		if (msg->result != EC_RES_SUCCESS)
+			return ret;
 
-		kfree(status_msg);
+		if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
+			return ret;
 	}
 
 	return ret;
 }
 
+static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+	int ret = cros_ec_xfer_command(ec_dev, msg);
+
+	if (msg->result == EC_RES_IN_PROGRESS)
+		ret = cros_ec_wait_until_complete(ec_dev, &msg->result);
+
+	return ret;
+}
+
 /**
  * cros_ec_prepare_tx() - Prepare an outgoing message in the output buffer.
  * @ec_dev: Device to register.
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 07/10] platform/chrome: cros_ec_proto: change Kunit expectation when timed out

[Tzung-Bi Shih]

While EC_COMMS_STATUS_PROCESSING flag is still on after it tries
EC_COMMAND_RETRIES times for sending EC_CMD_GET_COMMS_STATUS,
cros_ec_wait_until_complete() doesn't return an error code.

Change the expectation to an error code.

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto_test.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
index 64100fd81c6a..fbb872040711 100644
--- a/drivers/platform/chrome/cros_ec_proto_test.c
+++ b/drivers/platform/chrome/cros_ec_proto_test.c
@@ -1870,9 +1870,7 @@ static void cros_ec_proto_test_cmd_xfer_in_progress_retries_status_processing(st
 	}
 
 	ret = cros_ec_cmd_xfer(ec_dev, &msg);
-	KUNIT_EXPECT_EQ(test, ret, sizeof(struct ec_response_get_comms_status));
-
-	KUNIT_EXPECT_EQ(test, msg.result, EC_RES_SUCCESS);
+	KUNIT_EXPECT_EQ(test, ret, -EAGAIN);
 
 	/* For EC_CMD_GET_COMMS_STATUS EC_COMMAND_RETRIES times. */
 	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 51);
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 08/10] platform/chrome: cros_ec_proto: return -EAGAIN when retries timed out

[Tzung-Bi Shih]

While EC_COMMS_STATUS_PROCESSING flag is still on after it tries
EC_COMMAND_RETRIES times for sending EC_CMD_GET_COMMS_STATUS,
cros_ec_wait_until_complete() doesn't return an error code.

Return -EAGAIN in the case instead.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
No changes from v1.

 drivers/platform/chrome/cros_ec_proto.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index a6ad7f7956e6..9dec475edc84 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -167,6 +167,9 @@ static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *
 			return ret;
 	}
 
+	if (i >= EC_COMMAND_RETRIES)
+		ret = -EAGAIN;
+
 	return ret;
 }
 
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 09/10] platform/chrome: cros_ec_proto: add Kunit test for empty payload

[Tzung-Bi Shih]

cros_ec_wait_until_complete() sends EC_CMD_GET_COMMS_STATUS which expects
to receive sizeof(struct ec_response_get_comms_status) from
cros_ec_xfer_command().

Add Kunit test and expect to receive an error code when
cros_ec_xfer_command() returns 0.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
No changes from v1.

 drivers/platform/chrome/cros_ec_proto_test.c | 31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
index fbb872040711..d76e09b8a36a 100644
--- a/drivers/platform/chrome/cros_ec_proto_test.c
+++ b/drivers/platform/chrome/cros_ec_proto_test.c
@@ -1934,6 +1934,36 @@ static void cros_ec_proto_test_cmd_xfer_in_progress_return_error(struct kunit *t
 	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 2);
 }
 
+static void cros_ec_proto_test_cmd_xfer_in_progress_return0(struct kunit *test)
+{
+	struct cros_ec_proto_test_priv *priv = test->priv;
+	struct cros_ec_device *ec_dev = &priv->ec_dev;
+	struct ec_xfer_mock *mock;
+	int ret;
+	struct cros_ec_command msg;
+
+	memset(&msg, 0, sizeof(msg));
+
+	ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
+
+	/* For the first host command to return EC_RES_IN_PROGRESS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	/* For EC_CMD_GET_COMMS_STATUS. */
+	{
+		mock = cros_kunit_ec_xfer_mock_add(test, 0);
+		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
+	}
+
+	ret = cros_ec_cmd_xfer(ec_dev, &msg);
+	KUNIT_EXPECT_EQ(test, ret, -EPROTO);
+
+	KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 2);
+}
+
 static void cros_ec_proto_test_release(struct device *dev)
 {
 }
@@ -2013,6 +2043,7 @@ static struct kunit_case cros_ec_proto_test_cases[] = {
 	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_retries_status_processing),
 	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_xfer_error),
 	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_return_error),
+	KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_return0),
 	{}
 };
 
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH v2 10/10] platform/chrome: cros_ec_proto: return -EPROTO if empty payload

[Tzung-Bi Shih]

cros_ec_wait_until_complete() sends EC_CMD_GET_COMMS_STATUS which expects
to receive sizeof(struct ec_response_get_comms_status) from
cros_ec_xfer_command().

Return -EPROTO if cros_ec_xfer_command() returns 0.

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v1:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 9dec475edc84..05d2e8765a66 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -163,6 +163,11 @@ static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *
 		if (msg->result != EC_RES_SUCCESS)
 			return ret;
 
+		if (ret == 0) {
+			ret = -EPROTO;
+			break;
+		}
+
 		if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
 			return ret;
 	}
-- 
2.37.0.170.g444d1eabd0-goog

Re: [PATCH v2 06/10] platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete()

[Guenter Roeck]

On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
>
> EC returns EC_RES_IN_PROGRESS if the host command needs more time to
> complete.  Whenever receives the return code, cros_ec_send_command()
> sends EC_CMD_GET_COMMS_STATUS to query the command status.
>
> Separate cros_ec_wait_until_complete() from cros_ec_send_command().
> It sends EC_CMD_GET_COMMS_STATUS and waits until the previous command
> was completed, or encountered error, or timed out.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Reviewed-by: Guenter Roeck <groeck@chromium.org>

> ---
> Changes from v1:
> - Allocate buffer in cros_ec_wait_until_complete() statically.
> - Use `return ret` instead of `break` to make the intent explicit.
>
>  drivers/platform/chrome/cros_ec_proto.c | 74 ++++++++++++-------------
>  1 file changed, 35 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 0cec013be3d3..a6ad7f7956e6 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -134,56 +134,52 @@ static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_co
>         return ret;
>  }
>
> -static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
> +static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *result)
>  {
> -       int ret = cros_ec_xfer_command(ec_dev, msg);
> +       struct {
> +               struct cros_ec_command msg;
> +               struct ec_response_get_comms_status status;
> +       } __packed buf;
> +       struct cros_ec_command *msg = &buf.msg;
> +       struct ec_response_get_comms_status *status = &buf.status;
> +       int ret = 0, i;
>
> -       if (msg->result == EC_RES_IN_PROGRESS) {
> -               int i;
> -               struct cros_ec_command *status_msg;
> -               struct ec_response_get_comms_status *status;
> +       msg->version = 0;
> +       msg->command = EC_CMD_GET_COMMS_STATUS;
> +       msg->insize = sizeof(*status);
> +       msg->outsize = 0;
>
> -               status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status),
> -                                    GFP_KERNEL);
> -               if (!status_msg)
> -                       return -ENOMEM;
> +       /* Query the EC's status until it's no longer busy or we encounter an error. */
> +       for (i = 0; i < EC_COMMAND_RETRIES; ++i) {
> +               usleep_range(10000, 11000);
>
> -               status_msg->version = 0;
> -               status_msg->command = EC_CMD_GET_COMMS_STATUS;
> -               status_msg->insize = sizeof(*status);
> -               status_msg->outsize = 0;
> +               ret = cros_ec_xfer_command(ec_dev, msg);
> +               if (ret == -EAGAIN)
> +                       continue;
> +               if (ret < 0)
> +                       return ret;
>
> -               /*
> -                * Query the EC's status until it's no longer busy or
> -                * we encounter an error.
> -                */
> -               for (i = 0; i < EC_COMMAND_RETRIES; i++) {
> -                       usleep_range(10000, 11000);
> -
> -                       trace_cros_ec_request_start(status_msg);
> -                       ret = (*xfer_fxn)(ec_dev, status_msg);
> -                       trace_cros_ec_request_done(status_msg, ret);
> -                       if (ret == -EAGAIN)
> -                               continue;
> -                       if (ret < 0)
> -                               break;
> -
> -                       msg->result = status_msg->result;
> -                       if (status_msg->result != EC_RES_SUCCESS)
> -                               break;
> -
> -                       status = (struct ec_response_get_comms_status *)
> -                                status_msg->data;
> -                       if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
> -                               break;
> -               }
> +               *result = msg->result;
> +               if (msg->result != EC_RES_SUCCESS)
> +                       return ret;
>
> -               kfree(status_msg);
> +               if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
> +                       return ret;
>         }
>
>         return ret;
>  }
>
> +static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
> +{
> +       int ret = cros_ec_xfer_command(ec_dev, msg);
> +
> +       if (msg->result == EC_RES_IN_PROGRESS)
> +               ret = cros_ec_wait_until_complete(ec_dev, &msg->result);
> +
> +       return ret;
> +}
> +
>  /**
>   * cros_ec_prepare_tx() - Prepare an outgoing message in the output buffer.
>   * @ec_dev: Device to register.
> --
> 2.37.0.170.g444d1eabd0-goog
>

Re: [PATCH v2 08/10] platform/chrome: cros_ec_proto: return -EAGAIN when retries timed out

[Guenter Roeck]

On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
>
> While EC_COMMS_STATUS_PROCESSING flag is still on after it tries
> EC_COMMAND_RETRIES times for sending EC_CMD_GET_COMMS_STATUS,
> cros_ec_wait_until_complete() doesn't return an error code.
>
> Return -EAGAIN in the case instead.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Reviewed-by: Guenter Roeck <groeck@chromium.org>

> ---
> No changes from v1.
>
>  drivers/platform/chrome/cros_ec_proto.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index a6ad7f7956e6..9dec475edc84 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -167,6 +167,9 @@ static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *
>                         return ret;
>         }
>
> +       if (i >= EC_COMMAND_RETRIES)
> +               ret = -EAGAIN;
> +
>         return ret;
>  }
>
> --
> 2.37.0.170.g444d1eabd0-goog
>

Re: [PATCH v2 01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`

[Guenter Roeck]

On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
>
> Add default value for `msg->result` so that it won't be garbage bytes
> when the mock list is empty.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
> ---
> No v1.  New in the series.
>
>  drivers/platform/chrome/cros_kunit_util.c | 7 ++++++-
>  drivers/platform/chrome/cros_kunit_util.h | 1 +
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/chrome/cros_kunit_util.c b/drivers/platform/chrome/cros_kunit_util.c
> index e031777dea87..6810d558d462 100644
> --- a/drivers/platform/chrome/cros_kunit_util.c
> +++ b/drivers/platform/chrome/cros_kunit_util.c
> @@ -13,6 +13,8 @@
>  #include "cros_ec.h"
>  #include "cros_kunit_util.h"
>
> +int cros_kunit_ec_xfer_mock_default_result;
> +EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);

Is this needed as a global variable and, if so, does it really have to
be exported ?

>  int cros_kunit_ec_xfer_mock_default_ret;
>  EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);

Same here, really, only I didn't notice before.

Thanks,
Guenter

>
> @@ -24,8 +26,10 @@ int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_comman
>         struct ec_xfer_mock *mock;
>
>         mock = list_first_entry_or_null(&cros_kunit_ec_xfer_mock_in, struct ec_xfer_mock, list);
> -       if (!mock)
> +       if (!mock) {
> +               msg->result = cros_kunit_ec_xfer_mock_default_result;
>                 return cros_kunit_ec_xfer_mock_default_ret;
> +       }
>
>         list_del(&mock->list);
>
> @@ -89,6 +93,7 @@ EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_next);
>
>  void cros_kunit_mock_reset(void)
>  {
> +       cros_kunit_ec_xfer_mock_default_result = 0;
>         cros_kunit_ec_xfer_mock_default_ret = 0;
>         INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_in);
>         INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_out);
> diff --git a/drivers/platform/chrome/cros_kunit_util.h b/drivers/platform/chrome/cros_kunit_util.h
> index 79c4525f873c..79c4f259f2bb 100644
> --- a/drivers/platform/chrome/cros_kunit_util.h
> +++ b/drivers/platform/chrome/cros_kunit_util.h
> @@ -23,6 +23,7 @@ struct ec_xfer_mock {
>         u32 o_data_len;
>  };
>
> +extern int cros_kunit_ec_xfer_mock_default_result;
>  extern int cros_kunit_ec_xfer_mock_default_ret;
>
>  int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg);
> --
> 2.37.0.170.g444d1eabd0-goog
>

Re: [PATCH v2 09/10] platform/chrome: cros_ec_proto: add Kunit test for empty payload

[Guenter Roeck]

On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
>
> cros_ec_wait_until_complete() sends EC_CMD_GET_COMMS_STATUS which expects
> to receive sizeof(struct ec_response_get_comms_status) from
> cros_ec_xfer_command().
>
> Add Kunit test and expect to receive an error code when
> cros_ec_xfer_command() returns 0.
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Reviewed-by: Guenter Roeck <groeck@chromium.org>

> ---
> No changes from v1.
>
>  drivers/platform/chrome/cros_ec_proto_test.c | 31 ++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
> index fbb872040711..d76e09b8a36a 100644
> --- a/drivers/platform/chrome/cros_ec_proto_test.c
> +++ b/drivers/platform/chrome/cros_ec_proto_test.c
> @@ -1934,6 +1934,36 @@ static void cros_ec_proto_test_cmd_xfer_in_progress_return_error(struct kunit *t
>         KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 2);
>  }
>
> +static void cros_ec_proto_test_cmd_xfer_in_progress_return0(struct kunit *test)
> +{
> +       struct cros_ec_proto_test_priv *priv = test->priv;
> +       struct cros_ec_device *ec_dev = &priv->ec_dev;
> +       struct ec_xfer_mock *mock;
> +       int ret;
> +       struct cros_ec_command msg;
> +
> +       memset(&msg, 0, sizeof(msg));
> +
> +       ec_dev->pkt_xfer = cros_kunit_ec_pkt_xfer_mock;
> +
> +       /* For the first host command to return EC_RES_IN_PROGRESS. */
> +       {
> +               mock = cros_kunit_ec_xfer_mock_addx(test, 0, EC_RES_IN_PROGRESS, 0);
> +               KUNIT_ASSERT_PTR_NE(test, mock, NULL);
> +       }
> +
> +       /* For EC_CMD_GET_COMMS_STATUS. */
> +       {
> +               mock = cros_kunit_ec_xfer_mock_add(test, 0);
> +               KUNIT_ASSERT_PTR_NE(test, mock, NULL);
> +       }
> +
> +       ret = cros_ec_cmd_xfer(ec_dev, &msg);
> +       KUNIT_EXPECT_EQ(test, ret, -EPROTO);
> +
> +       KUNIT_EXPECT_EQ(test, cros_kunit_ec_pkt_xfer_mock_called, 2);
> +}
> +
>  static void cros_ec_proto_test_release(struct device *dev)
>  {
>  }
> @@ -2013,6 +2043,7 @@ static struct kunit_case cros_ec_proto_test_cases[] = {
>         KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_retries_status_processing),
>         KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_xfer_error),
>         KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_return_error),
> +       KUNIT_CASE(cros_ec_proto_test_cmd_xfer_in_progress_return0),
>         {}
>  };
>
> --
> 2.37.0.170.g444d1eabd0-goog
>

Re: [PATCH v2 01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`

[Tzung-Bi Shih]

On Mon, Jul 18, 2022 at 06:35:42AM -0700, Guenter Roeck wrote:
> On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
> > +int cros_kunit_ec_xfer_mock_default_result;
> > +EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);
> 
> Is this needed as a global variable and, if so, does it really have to
> be exported ?
> 
> >  int cros_kunit_ec_xfer_mock_default_ret;
> >  EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);
> 
> Same here, really, only I didn't notice before.

Global variables: I'm afraid yes.  They should be accessible to test cases
(e.g. drivers/platform/chrome/cros_ec_proto_test.c).

Exported: I'm not sure if I fixed it in a proper way.  They were added for
fixing https://lkml.org/lkml/2022/6/2/452.  When CONFIG_CROS_KUNIT=m and
CONFIG_CROS_EC_PROTO_KUNIT_TEST=m, cros_ec_proto_test.c still needs to access
them (in cros_kunit_util.c).

Re: [PATCH v2 01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`

[Guenter Roeck]

On Mon, Jul 18, 2022 at 9:00 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
>
> On Mon, Jul 18, 2022 at 06:35:42AM -0700, Guenter Roeck wrote:
> > On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
> > > +int cros_kunit_ec_xfer_mock_default_result;
> > > +EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);
> >
> > Is this needed as a global variable and, if so, does it really have to
> > be exported ?
> >
> > >  int cros_kunit_ec_xfer_mock_default_ret;
> > >  EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);
> >
> > Same here, really, only I didn't notice before.
>
> Global variables: I'm afraid yes.  They should be accessible to test cases
> (e.g. drivers/platform/chrome/cros_ec_proto_test.c).
>

Hmm, I don't see where that is used. Either case, even if the
variables are supposed to be used from cros_ec_proto_test.o, I don't
see why cros_ec_proto_test.o and cros_kunit_util.o need to be separate
modules. Can you combine them into a single module ? That would avoid
the exports.

Thanks,
Guenter

> Exported: I'm not sure if I fixed it in a proper way.  They were added for
> fixing https://lkml.org/lkml/2022/6/2/452.  When CONFIG_CROS_KUNIT=m and
> CONFIG_CROS_EC_PROTO_KUNIT_TEST=m, cros_ec_proto_test.c still needs to access
> them (in cros_kunit_util.c).

Re: [PATCH v2 01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`

[Tzung-Bi Shih]

On Tue, Jul 19, 2022 at 02:27:49PM -0700, Guenter Roeck wrote:
> On Mon, Jul 18, 2022 at 9:00 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
> >
> > On Mon, Jul 18, 2022 at 06:35:42AM -0700, Guenter Roeck wrote:
> > > On Sun, Jul 17, 2022 at 10:10 PM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
> > > > +int cros_kunit_ec_xfer_mock_default_result;
> > > > +EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_result);
> > >
> > > Is this needed as a global variable and, if so, does it really have to
> > > be exported ?
> > >
> > > >  int cros_kunit_ec_xfer_mock_default_ret;
> > > >  EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);
> > >
> > > Same here, really, only I didn't notice before.
> >
> > Global variables: I'm afraid yes.  They should be accessible to test cases
> > (e.g. drivers/platform/chrome/cros_ec_proto_test.c).
> >
> 
> Hmm, I don't see where that is used. Either case, even if the
> variables are supposed to be used from cros_ec_proto_test.o, I don't
> see why cros_ec_proto_test.o and cros_kunit_util.o need to be separate
> modules. Can you combine them into a single module ? That would avoid
> the exports.

Ack.  I realized these shouldn't be in current series.  Will separate them
into an indepedent series.

Re: [PATCH v2 00/10] platform/chrome: Kunit tests and refactor for cros_ec_cmd_xfer()

[patchwork-bot+chrome-platform]

Hello:

This series was applied to chrome-platform/linux.git (for-kernelci)
by Tzung-Bi Shih <tzungbi@kernel.org>:

On Mon, 18 Jul 2022 05:09:04 +0000 you wrote:
> The 1st patch fixes an issue that cros_kunit_ec_xfer_mock() could return
> garbage bytes for `msg->result` if the mock list is empty.
> 
> The 2nd ~ 6th patches add Kunit tests and refactors for cros_ec_cmd_xfer().
> 
> The last 4 patches change the behavior a bit by altering return codes.
> 
> [...]

Here is the summary with links:
  - [v2,01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`
    (no matching commit)
  - [v2,02/10] platform/chrome: cros_ec_proto: add "cros_ec_" prefix to send_command()
    https://git.kernel.org/chrome-platform/c/d311664b9057
  - [v2,03/10] platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_cmd_xfer()
    https://git.kernel.org/chrome-platform/c/82f4def2d822
  - [v2,04/10] platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_send_command()
    (no matching commit)
  - [v2,05/10] platform/chrome: cros_ec_proto: separate cros_ec_xfer_command()
    https://git.kernel.org/chrome-platform/c/810be30d27bd
  - [v2,06/10] platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete()
    https://git.kernel.org/chrome-platform/c/0aad9aff6a64
  - [v2,07/10] platform/chrome: cros_ec_proto: change Kunit expectation when timed out
    https://git.kernel.org/chrome-platform/c/00eb36d52872
  - [v2,08/10] platform/chrome: cros_ec_proto: return -EAGAIN when retries timed out
    https://git.kernel.org/chrome-platform/c/7f95d2b68b9a
  - [v2,09/10] platform/chrome: cros_ec_proto: add Kunit test for empty payload
    https://git.kernel.org/chrome-platform/c/82c9b7ed8c5c
  - [v2,10/10] platform/chrome: cros_ec_proto: return -EPROTO if empty payload
    https://git.kernel.org/chrome-platform/c/3e1c715ea179

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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Re: [PATCH v2 00/10] platform/chrome: Kunit tests and refactor for cros_ec_cmd_xfer()

[patchwork-bot+chrome-platform]

Hello:

This series was applied to chrome-platform/linux.git (for-next)
by Tzung-Bi Shih <tzungbi@kernel.org>:

On Mon, 18 Jul 2022 05:09:04 +0000 you wrote:
> The 1st patch fixes an issue that cros_kunit_ec_xfer_mock() could return
> garbage bytes for `msg->result` if the mock list is empty.
> 
> The 2nd ~ 6th patches add Kunit tests and refactors for cros_ec_cmd_xfer().
> 
> The last 4 patches change the behavior a bit by altering return codes.
> 
> [...]

Here is the summary with links:
  - [v2,01/10] platform/chrome: cros_kunit_util: add default value for `msg->result`
    (no matching commit)
  - [v2,02/10] platform/chrome: cros_ec_proto: add "cros_ec_" prefix to send_command()
    https://git.kernel.org/chrome-platform/c/d311664b9057
  - [v2,03/10] platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_cmd_xfer()
    https://git.kernel.org/chrome-platform/c/82f4def2d822
  - [v2,04/10] platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_send_command()
    (no matching commit)
  - [v2,05/10] platform/chrome: cros_ec_proto: separate cros_ec_xfer_command()
    https://git.kernel.org/chrome-platform/c/810be30d27bd
  - [v2,06/10] platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete()
    https://git.kernel.org/chrome-platform/c/0aad9aff6a64
  - [v2,07/10] platform/chrome: cros_ec_proto: change Kunit expectation when timed out
    https://git.kernel.org/chrome-platform/c/00eb36d52872
  - [v2,08/10] platform/chrome: cros_ec_proto: return -EAGAIN when retries timed out
    https://git.kernel.org/chrome-platform/c/7f95d2b68b9a
  - [v2,09/10] platform/chrome: cros_ec_proto: add Kunit test for empty payload
    https://git.kernel.org/chrome-platform/c/82c9b7ed8c5c
  - [v2,10/10] platform/chrome: cros_ec_proto: return -EPROTO if empty payload
    https://git.kernel.org/chrome-platform/c/3e1c715ea179

You are awesome, thank you!
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Deet-doot-dot, I am a bot.
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