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Subject[PATCH v4 6/9] bus: mhi: core: Introduce helper function to check device state
Introduce a helper function to determine whether the device is in a
powered ON state and resides in one of the active MHI states. This will
allow for some use cases where access can be pre-determined.

Signed-off-by: Bhaumik Bhatt <>
Reviewed-by: Jeffrey Hugo <>
drivers/bus/mhi/core/internal.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index cb32eaf..997c6e9 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -598,6 +598,11 @@ int mhi_queue_state_transition(struct mhi_controller *mhi_cntrl,
int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl);
int mhi_send_cmd(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
enum mhi_cmd_type cmd);
+static inline bool mhi_is_active(struct mhi_controller *mhi_cntrl)
+ return (mhi_cntrl->dev_state >= MHI_STATE_M0 &&
+ mhi_cntrl->dev_state <= MHI_STATE_M3_FAST);

static inline void mhi_trigger_resume(struct mhi_controller *mhi_cntrl,
bool hard_wakeup)
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a Linux Foundation Collaborative Project
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