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Date:   Mon, 11 May 2020 19:33:13 -0700
From:   Bhaumik Bhatt <>
        Bhaumik Bhatt <>
Subject: [PATCH v1 3/6] 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 in reading debugfs entries.

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 b1f640b..2f18be7 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -599,6 +599,11 @@ 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);
 /* Register access methods */
 void mhi_db_brstmode(struct mhi_controller *mhi_cntrl, struct db_cfg *db_cfg,
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