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* [PATCH linux dev-5.1] OCC: FSI and hwmon: Add sequence numbering
@ 2019-06-26 19:06 Eddie James
  2019-07-01  9:44 ` Lei YU
  0 siblings, 1 reply; 2+ messages in thread
From: Eddie James @ 2019-06-26 19:06 UTC (permalink / raw)
  To: openbmc; +Cc: mine260309, joel, Eddie James

Sequence numbering of the commands submitted to the OCC is required by
the OCC interface specification. Add sequence numbering and check for
the correct sequence number on the response.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-occ.c      | 15 ++++++++++++---
 drivers/hwmon/occ/common.c |  4 ++--
 drivers/hwmon/occ/common.h |  1 +
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c
index a2301ce..7da9c81 100644
--- a/drivers/fsi/fsi-occ.c
+++ b/drivers/fsi/fsi-occ.c
@@ -412,6 +412,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
 		msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS);
 	struct occ *occ = dev_get_drvdata(dev);
 	struct occ_response *resp = response;
+	u8 seq_no;
 	u16 resp_data_length;
 	unsigned long start;
 	int rc;
@@ -426,6 +427,8 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
 
 	mutex_lock(&occ->occ_lock);
 
+	/* Extract the seq_no from the command (first byte) */
+	seq_no = *(const u8 *)request;
 	rc = occ_putsram(occ, OCC_SRAM_CMD_ADDR, request, req_len);
 	if (rc)
 		goto done;
@@ -441,11 +444,17 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
 		if (rc)
 			goto done;
 
-		if (resp->return_status == OCC_RESP_CMD_IN_PRG) {
+		if (resp->return_status == OCC_RESP_CMD_IN_PRG ||
+		    resp->seq_no != seq_no) {
 			rc = -ETIMEDOUT;
 
-			if (time_after(jiffies, start + timeout))
-				break;
+			if (time_after(jiffies, start + timeout)) {
+				dev_err(occ->dev, "resp timeout status=%02x "
+					"resp seq_no=%d our seq_no=%d\n",
+					resp->return_status, resp->seq_no,
+					seq_no);
+				goto done;
+			}
 
 			set_current_state(TASK_UNINTERRUPTIBLE);
 			schedule_timeout(wait_time);
diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
index d7cc0d2..e9d7167 100644
--- a/drivers/hwmon/occ/common.c
+++ b/drivers/hwmon/occ/common.c
@@ -122,12 +122,12 @@ struct extended_sensor {
 static int occ_poll(struct occ *occ)
 {
 	int rc;
-	u16 checksum = occ->poll_cmd_data + 1;
+	u16 checksum = occ->poll_cmd_data + occ->seq_no + 1;
 	u8 cmd[8];
 	struct occ_poll_response_header *header;
 
 	/* big endian */
-	cmd[0] = 0;			/* sequence number */
+	cmd[0] = occ->seq_no++;		/* sequence number */
 	cmd[1] = 0;			/* cmd type */
 	cmd[2] = 0;			/* data length msb */
 	cmd[3] = 1;			/* data length lsb */
diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h
index fc13f3c..67e6968 100644
--- a/drivers/hwmon/occ/common.h
+++ b/drivers/hwmon/occ/common.h
@@ -95,6 +95,7 @@ struct occ {
 	struct occ_sensors sensors;
 
 	int powr_sample_time_us;	/* average power sample time */
+	u8 seq_no;
 	u8 poll_cmd_data;		/* to perform OCC poll command */
 	int (*send_cmd)(struct occ *occ, u8 *cmd);
 
-- 
1.8.3.1

^ permalink raw reply related	[flat|nested] 2+ messages in thread
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2019-06-26 19:06 [PATCH linux dev-5.1] OCC: FSI and hwmon: Add sequence numbering Eddie James
2019-07-01  9:44 ` Lei YU

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