michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: peci: xec: Handle PECI command PING properly

Browse source 
Handle PECI command PING properly, also get Write FCS Byte as a check.
Now it is possible to perform a PECI Ping without crashing the bus or
blocking it for subsequent PECI transactions.
It is also possible to check whether the Ping was sucessful
or not with the Write FCS Byte.

Signed-off-by: Johannes Meister <johannes.meister@kontron.com>
This commit is contained in:
Johannes Meister 2022-02-24 08:06:27 +01:00 • committed by Maureen Helm
commit 7d1c15d09e
1 changed files with 8 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

9
drivers/peci/peci_mchp_xec.c
View file

@ -313,6 +313,12 @@ static int peci_xec_read(const struct device *dev, struct peci_msg *msg)
/* Get write block FCS just for debug */
tx_fcs = regs->RD_DATA;
LOG_DBG("TX FCS %x", tx_fcs);
/* If a Ping is done, write Tx fcs to rx buffer*/
if (msg->cmd_code == PECI_CMD_PING) {
rx_buf->buf[0] = tx_fcs;
break;
}
} else if (i == (rx_buf->len + 1)) {
/* Get read block FCS, but don't count it */
rx_buf->buf[i-1] = regs->RD_DATA;
@ -353,8 +359,9 @@ static int peci_xec_transfer(const struct device *dev, struct peci_msg *msg)
/* If a PECI transmission is successful, it may or not involve
* a read operation, check if transaction expects a response
* Also perform a read when PECI cmd is Ping to get Write FCS
*/
if (msg->rx_buffer.len) {
if (msg->rx_buffer.len || (msg->cmd_code == PECI_CMD_PING)) {
ret = peci_xec_read(dev, msg);
if (ret) {
return ret;