mei: enable async event notifications only from hbm version 2.0

Only FW version 2.0 and newer support the async event
notification. For backward compatibility block the feature
if the FW version is older then 2.0

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 14 insertions, 0 deletions

diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index e39cfe6bc5bc..4b469cf9e60f 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -158,6 +158,8 @@ static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
                                  dev->hbm_f_dc_supported);
                 pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n",
                                  dev->hbm_f_dot_supported);
+                pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n",
+                                 dev->hbm_f_ev_supported);
         }
 
         pos += scnprintf(buf + pos, bufsz - pos, "pg:  %s, %s\n",
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 8a73fa06f3c4..95e918c84a6c 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -903,6 +903,10 @@ static void mei_hbm_config_features(struct mei_device *dev)
         /* disconnect on connect timeout instead of link reset */
         if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
                 dev->hbm_f_dot_supported = 1;
+
+        /* Notification Event Support */
+        if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
+                dev->hbm_f_ev_supported = 1;
 }
 
 /**
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index a2c7aaba25d4..3f8901a503a6 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -58,6 +58,12 @@
 #define HBM_MINOR_VERSION_DOT              0
 #define HBM_MAJOR_VERSION_DOT              2
 
+/*
+ * MEI version with notifcation support
+ */
+#define HBM_MINOR_VERSION_EV               0
+#define HBM_MAJOR_VERSION_EV               2
+
 /* Host bus message command opcode */
 #define MEI_HBM_CMD_OP_MSK                  0x7f
 /* Host bus message command RESPONSE */
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 362ebb15ccd9..e22bd21bb754 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -419,6 +419,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  * @hbm_f_pg_supported  : hbm feature pgi protocol
  * @hbm_f_dc_supported  : hbm feature dynamic clients
  * @hbm_f_dot_supported : hbm feature disconnect on timeout
+ * @hbm_f_ev_supported  : hbm feature event notification
  *
  * @me_clients_rwsem: rw lock over me_clients list
  * @me_clients  : list of FW clients
@@ -514,6 +515,7 @@ struct mei_device {
         unsigned int hbm_f_pg_supported:1;
         unsigned int hbm_f_dc_supported:1;
         unsigned int hbm_f_dot_supported:1;
+        unsigned int hbm_f_ev_supported:1;
 
         struct rw_semaphore me_clients_rwsem;
         struct list_head me_clients;