mei: implement power gating isolation hbm layer
Add send message functions and receive dispatch stubs
for power gating isolation hbm protocol.
The protocol consist of requests for entering and exiting
the power gating isolation state and their responses.
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>
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 4960288..a16b47c 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -14,6 +14,7 @@
*
*/
+#include <linux/export.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/wait.h>
@@ -289,6 +290,34 @@
return 0;
}
+/*
+ * mei_hbm_pg - sends pg command
+ *
+ * @dev: the device structure
+ * @pg_cmd: the pg command code
+ *
+ * This function returns -EIO on write failure
+ */
+int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
+{
+ struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+ struct hbm_power_gate *req;
+ const size_t len = sizeof(struct hbm_power_gate);
+ int ret;
+
+ mei_hbm_hdr(mei_hdr, len);
+
+ req = (struct hbm_power_gate *)dev->wr_msg.data;
+ memset(req, 0, len);
+ req->hbm_cmd = pg_cmd;
+
+ ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+ if (ret)
+ dev_err(&dev->pdev->dev, "power gate command write failed.\n");
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mei_hbm_pg);
+
/**
* mei_hbm_stop_req - send stop request message
*
@@ -701,6 +730,18 @@
mei_hbm_cl_flow_control_res(dev, flow_control);
break;
+ case MEI_PG_ISOLATION_ENTRY_RES_CMD:
+ dev_dbg(&dev->pdev->dev, "power gate isolation entry response received\n");
+ if (waitqueue_active(&dev->wait_pg))
+ wake_up(&dev->wait_pg);
+ break;
+
+ case MEI_PG_ISOLATION_EXIT_REQ_CMD:
+ dev_dbg(&dev->pdev->dev, "power gate isolation exit request received\n");
+ if (waitqueue_active(&dev->wait_pg))
+ wake_up(&dev->wait_pg);
+ break;
+
case HOST_CLIENT_PROPERTIES_RES_CMD:
dev_dbg(&dev->pdev->dev, "hbm: properties response: message received.\n");