diff options
| -rw-r--r-- | drivers/misc/mei/hbm.c | 2 | ||||
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 92 | ||||
| -rw-r--r-- | drivers/misc/mei/hw-me.h | 4 | ||||
| -rw-r--r-- | drivers/misc/mei/hw.h | 1 |
4 files changed, 95 insertions, 4 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; diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 02f3b0c3a2a3..4b048b67a248 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -109,9 +109,12 @@ static inline void mei_hcsr_set(struct mei_me_hw *hw, u32 hcsr) */ static void mei_me_hw_config(struct mei_device *dev) { + struct mei_me_hw *hw = to_me_hw(dev); u32 hcsr = mei_hcsr_read(to_me_hw(dev)); /* Doesn't change in runtime */ dev->hbuf_depth = (hcsr & H_CBD) >> 24; + + hw->pg_state = MEI_PG_OFF; } /** @@ -123,7 +126,8 @@ static void mei_me_hw_config(struct mei_device *dev) */ static inline enum mei_pg_state mei_me_pg_state(struct mei_device *dev) { - return MEI_PG_OFF; + struct mei_me_hw *hw = to_me_hw(dev); + return hw->pg_state; } /** @@ -473,6 +477,80 @@ static void mei_me_pg_exit(struct mei_device *dev) } /** + * mei_me_pg_set_sync - perform pg entry procedure + * + * @dev: the device structure + * + * returns 0 on success an error code otherwise + */ +int mei_me_pg_set_sync(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); + int ret; + + dev->pg_event = MEI_PG_EVENT_WAIT; + + ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD); + if (ret) + return ret; + + mutex_unlock(&dev->device_lock); + wait_event_timeout(dev->wait_pg, + dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); + mutex_lock(&dev->device_lock); + + if (dev->pg_event == MEI_PG_EVENT_RECEIVED) { + mei_me_pg_enter(dev); + ret = 0; + } else { + ret = -ETIME; + } + + dev->pg_event = MEI_PG_EVENT_IDLE; + hw->pg_state = MEI_PG_ON; + + return ret; +} + +/** + * mei_me_pg_unset_sync - perform pg exit procedure + * + * @dev: the device structure + * + * returns 0 on success an error code otherwise + */ +int mei_me_pg_unset_sync(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); + int ret; + + if (dev->pg_event == MEI_PG_EVENT_RECEIVED) + goto reply; + + dev->pg_event = MEI_PG_EVENT_WAIT; + + mei_me_pg_exit(dev); + + mutex_unlock(&dev->device_lock); + wait_event_timeout(dev->wait_pg, + dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); + mutex_lock(&dev->device_lock); + +reply: + if (dev->pg_event == MEI_PG_EVENT_RECEIVED) + ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD); + else + ret = -ETIME; + + dev->pg_event = MEI_PG_EVENT_IDLE; + hw->pg_state = MEI_PG_OFF; + + return ret; +} + +/** * mei_me_pg_is_enabled - detect if PG is supported by HW * * @dev: the device structure @@ -601,9 +679,15 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id) dev->hbuf_is_ready = mei_hbuf_is_ready(dev); - rets = mei_irq_write_handler(dev, &complete_list); - - dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + /* + * During PG handshake only allowed write is the replay to the + * PG exit message, so block calling write function + * if the pg state is not idle + */ + if (dev->pg_event == MEI_PG_EVENT_IDLE) { + rets = mei_irq_write_handler(dev, &complete_list); + dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + } mei_irq_compl_handler(dev, &complete_list); diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h index 893d5119fa9b..8b412820cc66 100644 --- a/drivers/misc/mei/hw-me.h +++ b/drivers/misc/mei/hw-me.h @@ -31,12 +31,16 @@ struct mei_me_hw { */ u32 host_hw_state; u32 me_hw_state; + enum mei_pg_state pg_state; }; #define to_me_hw(dev) (struct mei_me_hw *)((dev)->hw) struct mei_device *mei_me_dev_init(struct pci_dev *pdev); +int mei_me_pg_set_sync(struct mei_device *dev); +int mei_me_pg_unset_sync(struct mei_device *dev); + irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id); irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id); diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h index ec4a91a534e6..9bad9cf7a8a0 100644 --- a/drivers/misc/mei/hw.h +++ b/drivers/misc/mei/hw.h @@ -31,6 +31,7 @@ #define MEI_IAMTHIF_STALL_TIMER 12 /* HPS */ #define MEI_IAMTHIF_READ_TIMER 10 /* HPS */ +#define MEI_PGI_TIMEOUT 1 /* PG Isolation time response 1 sec */ #define MEI_HBM_TIMEOUT 1 /* 1 second */ /* |