diff options
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/intel/sdsi.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/sdsi.c b/drivers/platform/x86/intel/sdsi.c index d80c2dc0ce71..bb3eaf5eb382 100644 --- a/drivers/platform/x86/intel/sdsi.c +++ b/drivers/platform/x86/intel/sdsi.c @@ -67,6 +67,7 @@ #define CTRL_OWNER GENMASK(5, 4) #define CTRL_COMPLETE BIT(6) #define CTRL_READY BIT(7) +#define CTRL_INBAND_LOCK BIT(32) #define CTRL_STATUS GENMASK(15, 8) #define CTRL_PACKET_SIZE GENMASK(31, 16) #define CTRL_MSG_SIZE GENMASK(63, 48) @@ -346,6 +347,11 @@ static int sdsi_mbox_read(struct sdsi_priv *priv, struct sdsi_mbox_info *info, s return sdsi_mbox_cmd_read(priv, info, data_size); } +static bool sdsi_ib_locked(struct sdsi_priv *priv) +{ + return !!FIELD_GET(CTRL_INBAND_LOCK, readq(priv->control_addr)); +} + static ssize_t sdsi_provision(struct sdsi_priv *priv, char *buf, size_t count, enum sdsi_command command) { @@ -355,6 +361,10 @@ static ssize_t sdsi_provision(struct sdsi_priv *priv, char *buf, size_t count, if (count > (SDSI_SIZE_WRITE_MSG - SDSI_SIZE_CMD)) return -EOVERFLOW; + /* Make sure In-band lock is not set */ + if (sdsi_ib_locked(priv)) + return -EPERM; + /* Qword aligned message + command qword */ info.size = round_up(count, SDSI_SIZE_CMD) + SDSI_SIZE_CMD; |