bus: mhi: core: Improve mhi_sync_power_up handling for SYS_ERR state

Allow mhi_sync_power_up to handle SYS_ERR during power-up, reboot,
or recovery. This is to avoid premature exit when MHI_PM_IN_ERROR_STATE is
observed during above mentioned system states.

To achieve this, treat SYS_ERR as a valid state and let its handler process
the error and queue the next transition to Mission Mode instead of aborting
early.

Signed-off-by: Vivek Pernamitta <[email protected]>
[mani: reworded description]
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Vivek Pernamitta

drivers/bus/mhi/host/internal.h

@@ -170,6 +170,8 @@ enum mhi_pm_state {
 							MHI_PM_IN_ERROR_STATE(pm_state))
 #define MHI_PM_IN_SUSPEND_STATE(pm_state)		(pm_state & \
 							(MHI_PM_M3_ENTER | MHI_PM_M3))
+#define MHI_PM_FATAL_ERROR(pm_state)			((pm_state == MHI_PM_FW_DL_ERR) || \
+							(pm_state >= MHI_PM_SYS_ERR_FAIL))
 
 #define NR_OF_CMD_RINGS					1
 #define CMD_EL_PER_RING					128

drivers/bus/mhi/host/pm.c

@@ -1287,7 +1287,7 @@ int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
 		mhi_cntrl->ready_timeout_ms : mhi_cntrl->timeout_ms;
 	wait_event_timeout(mhi_cntrl->state_event,
 			   MHI_IN_MISSION_MODE(mhi_cntrl->ee) ||
-			   MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
+			   MHI_PM_FATAL_ERROR(mhi_cntrl->pm_state),
 			   msecs_to_jiffies(timeout_ms));
 
 	ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT;