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OCC: FSI and hwmon: Add sequence numbering

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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 <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
Reviewed-by: Lei YU <[email protected]>
Signed-off-by: Joel Stanley <[email protected]>
This commit is contained in:
Eddie James 2019-07-02 10:47:42 -05:00 • committed by Joel Stanley
commit afd26118f0
3 changed files with 15 additions and 5 deletions
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15
drivers/fsi/fsi-occ.c
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@ -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);