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authorEddie James <eajames@linux.ibm.com>2019-07-02 10:47:42 -0500
committerJoel Stanley <joel@jms.id.au>2019-07-03 10:41:22 +0930
commitafd26118f0dcf29db031a213f6f95c46ff3bdcbe (patch)
treec0bfe617ef7e18bff6fb23bd3cafc131691271df /drivers/fsi/fsi-occ.c
parent60c87bc53178965aeb3dea798020e33900ab46f0 (diff)
OCC: FSI and hwmon: Add sequence numbering
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> Acked-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Lei YU <mine260309@gmail.com> Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/fsi/fsi-occ.c')
-rw-r--r--drivers/fsi/fsi-occ.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c
index a2301cea1cbb..7da9c81759ac 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);