mei: me: add pg exit and entry flow commands

For power gating entry we write hbm pg entry request command and
then we set pg register
For power gating exit we clear pg register and wait for exit request
hbm command.

Exit power gating request might also be initiated by the firmware
w/o explicit driver request

The power gating state is tracked by pg_state member of me_hw

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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index a16b47c855aa..a725365e2150 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -732,12 +732,14 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 
         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
                 dev_dbg(&dev->pdev->dev, "power gate isolation entry response received\n");
+                dev->pg_event = MEI_PG_EVENT_RECEIVED;
                 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");
+                dev->pg_event = MEI_PG_EVENT_RECEIVED;
                 if (waitqueue_active(&dev->wait_pg))
                         wake_up(&dev->wait_pg);
                 break;