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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>
alistair/sunxi64-5.4-dsi
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);