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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 <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>
This commit is contained in:
Eddie James 2019-07-02 10:47:42 -05:00 committed by Joel Stanley
parent 60c87bc531
commit afd26118f0
3 changed files with 15 additions and 5 deletions
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15
drivers/fsi/fsi-occ.c
View File

@ -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);

4
drivers/hwmon/occ/common.c
View File

@ -124,12 +124,12 @@ 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 */

1
drivers/hwmon/occ/common.h
View File

@ -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);