APML mailbox protocol returns additional error codes written by
SMU firmware in the out-bound register 0x37. These errors include,
invalid core, message not supported over platform and
others. This additional error codes can be used to provide more
details to userspace.
Signed-off-by: Akshay Gupta <akshay.gupta@xxxxxxx>
Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@xxxxxxx>
---
Changes since v1:
- bifurcated from previous patch 5
drivers/misc/amd-sbi/rmi-core.c | 12 +++++++++++-
include/uapi/misc/amd-apml.h | 4 ++++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/amd-sbi/rmi-core.c b/drivers/misc/amd-sbi/rmi-core.c
index e7778749940e..01c3a6c9c15c 100644
--- a/drivers/misc/amd-sbi/rmi-core.c
+++ b/drivers/misc/amd-sbi/rmi-core.c
@@ -27,13 +27,15 @@
int rmi_mailbox_xfer(struct sbrmi_data *data,
struct apml_message *msg)
{
- unsigned int bytes;
+ unsigned int bytes, ec;
int i, ret, retry = 10;
int sw_status;
u8 byte;
mutex_lock(&data->lock);
+ msg->fw_ret_code = 0;
+
/* Indicate firmware a command is to be serviced */
ret = regmap_write(data->regmap, SBRMI_INBNDMSG7, START_CMD);
if (ret < 0)
@@ -85,6 +87,9 @@ int rmi_mailbox_xfer(struct sbrmi_data *data,
goto exit_unlock;
}
+ ret = regmap_read(data->regmap, SBRMI_OUTBNDMSG7, &ec);
+ if (ret || ec)
+ goto exit_clear_alert;
/*
* For a read operation, the initiator (BMC) reads the firmware
* response Command Data Out[31:0] from SBRMI::OutBndMsg_inst[4:1]
@@ -100,12 +105,17 @@ int rmi_mailbox_xfer(struct sbrmi_data *data,
}
}
+exit_clear_alert:
/*
* BMC must write 1'b1 to SBRMI::Status[SwAlertSts] to clear the
* ALERT to initiator
*/
ret = regmap_write(data->regmap, SBRMI_STATUS,
sw_status | SW_ALERT_MASK);
+ if (ec) {
+ ret = -EPROTOTYPE;
+ msg->fw_ret_code = ec;
+ }
exit_unlock:
mutex_unlock(&data->lock);
return ret;
diff --git a/include/uapi/misc/amd-apml.h b/include/uapi/misc/amd-apml.h
index 81e505eccac4..06e93a6a8f4b 100644
--- a/include/uapi/misc/amd-apml.h
+++ b/include/uapi/misc/amd-apml.h
@@ -38,6 +38,10 @@ struct apml_message {
__u32 mb_in[2];
__u8 reg_in[8];
} data_in;
+ /*
+ * Error code is returned in case of soft mailbox
+ */
+ __u32 fw_ret_code;
} __attribute__((packed));
/* ioctl command for mailbox msgs using generic _IOWR */
--
2.44.0
