diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mei/hbm.c | 85 |
1 files changed, 70 insertions, 15 deletions
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c index 7646569922fe..21f40ce87ac8 100644 --- a/drivers/misc/mei/hbm.c +++ b/drivers/misc/mei/hbm.c @@ -880,6 +880,68 @@ static int mei_hbm_fw_disconnect_req(struct mei_device *dev, } /** + * mei_hbm_pg_enter_res - PG enter response received + * + * @dev: the device structure. + * + * Return: 0 on success, -EPROTO on state mismatch + */ +static int mei_hbm_pg_enter_res(struct mei_device *dev) +{ + if (mei_pg_state(dev) != MEI_PG_OFF || + dev->pg_event != MEI_PG_EVENT_WAIT) { + dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n", + mei_pg_state_str(mei_pg_state(dev)), dev->pg_event); + return -EPROTO; + } + + dev->pg_event = MEI_PG_EVENT_RECEIVED; + wake_up(&dev->wait_pg); + + return 0; +} + +/** + * mei_hbm_pg_exit_res - PG exit response received + * + * @dev: the device structure. + * + * Return: 0 on success, -EPROTO on state mismatch + */ +static int mei_hbm_pg_exit_res(struct mei_device *dev) +{ + if (mei_pg_state(dev) != MEI_PG_ON || + (dev->pg_event != MEI_PG_EVENT_WAIT && + dev->pg_event != MEI_PG_EVENT_IDLE)) { + dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n", + mei_pg_state_str(mei_pg_state(dev)), dev->pg_event); + return -EPROTO; + } + + switch (dev->pg_event) { + case MEI_PG_EVENT_WAIT: + dev->pg_event = MEI_PG_EVENT_RECEIVED; + wake_up(&dev->wait_pg); + break; + case MEI_PG_EVENT_IDLE: + /* + * If the driver is not waiting on this then + * this is HW initiated exit from PG. + * Start runtime pm resume sequence to exit from PG. + */ + dev->pg_event = MEI_PG_EVENT_RECEIVED; + pm_request_resume(dev->dev); + break; + default: + WARN(1, "hbm: pg exit response: unexpected pg event = %d\n", + dev->pg_event); + return -EPROTO; + } + + return 0; +} + +/** * mei_hbm_config_features - check what hbm features and commands * are supported by the fw * @@ -1027,24 +1089,17 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr) break; case MEI_PG_ISOLATION_ENTRY_RES_CMD: - dev_dbg(dev->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); + dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n"); + ret = mei_hbm_pg_enter_res(dev); + if (ret) + return ret; break; case MEI_PG_ISOLATION_EXIT_REQ_CMD: - dev_dbg(dev->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); - else - /* - * If the driver is not waiting on this then - * this is HW initiated exit from PG. - * Start runtime pm resume sequence to exit from PG. - */ - pm_request_resume(dev->dev); + dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n"); + ret = mei_hbm_pg_exit_res(dev); + if (ret) + return ret; break; case HOST_CLIENT_PROPERTIES_RES_CMD: |
