Re: [PATCH v3 05/25] bus: mhi: Make mhi_state_str[] array static inline and move to common.h

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On 2/12/22 12:20 PM, Manivannan Sadhasivam wrote:

mhi_state_str[] array could be used by MHI endpoint stack also. So let's
make the array as "static inline function" and move it inside the
"common.h" header so that the endpoint stack could also make use of it.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>


I like the use of a function to encapsulate this rather than
using the array as before.
But I still don't like declaring this much static data in a static inline function in a header file. Define it as a "real" function 
somewhere common and declare it here instead.

One more minor comment below.

					-Alex


---
  drivers/bus/mhi/common.h       | 29 +++++++++++++++++++++++++----
  drivers/bus/mhi/host/boot.c    |  2 +-
  drivers/bus/mhi/host/debugfs.c |  6 +++---
  drivers/bus/mhi/host/init.c    | 12 ------------
  drivers/bus/mhi/host/main.c    |  8 ++++----
  drivers/bus/mhi/host/pm.c      | 14 +++++++-------
  6 files changed, 40 insertions(+), 31 deletions(-)

diff --git a/drivers/bus/mhi/common.h b/drivers/bus/mhi/common.h
index 0d13a202d334..288e47168649 100644
--- a/drivers/bus/mhi/common.h
+++ b/drivers/bus/mhi/common.h
@@ -159,9 +159,30 @@ struct mhi_cmd_ctxt {
  	__le64 wp __packed __aligned(4);
  };
-extern const char * const mhi_state_str[MHI_STATE_MAX]; 
-#define TO_MHI_STATE_STR(state) ((state >= MHI_STATE_MAX || \
-				  !mhi_state_str[state]) ? \
-				"INVALID_STATE" : mhi_state_str[state])
+static inline const char * const mhi_state_str(enum mhi_state state)
+{
+	switch (state) {
+	case MHI_STATE_RESET:
+		return "RESET";
+	case MHI_STATE_READY:
+		return "READY";
+	case MHI_STATE_M0:
+		return "M0";
+	case MHI_STATE_M1:
+		return "M1";
+	case MHI_STATE_M2:
+		return"M2";


Add space after "return" here and in a few places below.


+	case MHI_STATE_M3:
+		return"M3";
+	case MHI_STATE_M3_FAST:
+		return"M3 FAST";
+	case MHI_STATE_BHI:
+		return"BHI";
+	case MHI_STATE_SYS_ERR:
+		return "SYS ERROR";
+	default:
+		return "Unknown state";
+	}
+};
#endif /* _MHI_COMMON_H */ 
diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
index 74295d3cc662..93cb705614c6 100644
--- a/drivers/bus/mhi/host/boot.c
+++ b/drivers/bus/mhi/host/boot.c
@@ -68,7 +68,7 @@ static int __mhi_download_rddm_in_panic(struct mhi_controller *mhi_cntrl)
dev_dbg(dev, "Entered with pm_state:%s dev_state:%s ee:%s\n", 
  		to_mhi_pm_state_str(mhi_cntrl->pm_state),
-		TO_MHI_STATE_STR(mhi_cntrl->dev_state),
+		mhi_state_str(mhi_cntrl->dev_state),
  		TO_MHI_EXEC_STR(mhi_cntrl->ee));
/* 
diff --git a/drivers/bus/mhi/host/debugfs.c b/drivers/bus/mhi/host/debugfs.c
index d818586c229d..399d0db1f1eb 100644
--- a/drivers/bus/mhi/host/debugfs.c
+++ b/drivers/bus/mhi/host/debugfs.c
@@ -20,7 +20,7 @@ static int mhi_debugfs_states_show(struct seq_file *m, void *d)
  	seq_printf(m, "PM state: %s Device: %s MHI state: %s EE: %s wake: %s\n",
  		   to_mhi_pm_state_str(mhi_cntrl->pm_state),
  		   mhi_is_active(mhi_cntrl) ? "Active" : "Inactive",
-		   TO_MHI_STATE_STR(mhi_cntrl->dev_state),
+		   mhi_state_str(mhi_cntrl->dev_state),
  		   TO_MHI_EXEC_STR(mhi_cntrl->ee),
  		   mhi_cntrl->wake_set ? "true" : "false");
@@ -206,13 +206,13 @@ static int mhi_debugfs_regdump_show(struct seq_file *m, void *d) seq_printf(m, "Host PM state: %s Device state: %s EE: %s\n", 
  		   to_mhi_pm_state_str(mhi_cntrl->pm_state),
-		   TO_MHI_STATE_STR(mhi_cntrl->dev_state),
+		   mhi_state_str(mhi_cntrl->dev_state),
  		   TO_MHI_EXEC_STR(mhi_cntrl->ee));
state = mhi_get_mhi_state(mhi_cntrl); 
  	ee = mhi_get_exec_env(mhi_cntrl);
  	seq_printf(m, "Device EE: %s state: %s\n", TO_MHI_EXEC_STR(ee),
-		   TO_MHI_STATE_STR(state));
+		   mhi_state_str(state));
for (i = 0; regs[i].name; i++) { 
  		if (!regs[i].base)
diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index 4bd62f32695d..0e301f3f305e 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -44,18 +44,6 @@ const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = {
  	[DEV_ST_TRANSITION_DISABLE] = "DISABLE",
  };
-const char * const mhi_state_str[MHI_STATE_MAX] = { 
-	[MHI_STATE_RESET] = "RESET",
-	[MHI_STATE_READY] = "READY",
-	[MHI_STATE_M0] = "M0",
-	[MHI_STATE_M1] = "M1",
-	[MHI_STATE_M2] = "M2",
-	[MHI_STATE_M3] = "M3",
-	[MHI_STATE_M3_FAST] = "M3 FAST",
-	[MHI_STATE_BHI] = "BHI",
-	[MHI_STATE_SYS_ERR] = "SYS ERROR",
-};
-
  const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX] = {
  	[MHI_CH_STATE_TYPE_RESET] = "RESET",
  	[MHI_CH_STATE_TYPE_STOP] = "STOP",
diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index 85f4f7c8d7c6..e436c2993d97 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -479,8 +479,8 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv)
  	ee = mhi_get_exec_env(mhi_cntrl);
  	dev_dbg(dev, "local ee: %s state: %s device ee: %s state: %s\n",
  		TO_MHI_EXEC_STR(mhi_cntrl->ee),
-		TO_MHI_STATE_STR(mhi_cntrl->dev_state),
-		TO_MHI_EXEC_STR(ee), TO_MHI_STATE_STR(state));
+		mhi_state_str(mhi_cntrl->dev_state),
+		TO_MHI_EXEC_STR(ee), mhi_state_str(state));
if (state == MHI_STATE_SYS_ERR) { 
  		dev_dbg(dev, "System error detected\n");
@@ -846,7 +846,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
  			new_state = MHI_TRE_GET_EV_STATE(local_rp);
dev_dbg(dev, "State change event to state: %s\n", 
-				TO_MHI_STATE_STR(new_state));
+				mhi_state_str(new_state));
switch (new_state) { 
  			case MHI_STATE_M0:
@@ -873,7 +873,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
  			}
  			default:
  				dev_err(dev, "Invalid state: %s\n",
-					TO_MHI_STATE_STR(new_state));
+					mhi_state_str(new_state));
  			}
break; 
diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c
index c35c5ddc7220..088ade0f3e0b 100644
--- a/drivers/bus/mhi/host/pm.c
+++ b/drivers/bus/mhi/host/pm.c
@@ -545,7 +545,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl)
dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n", 
  		to_mhi_pm_state_str(mhi_cntrl->pm_state),
-		TO_MHI_STATE_STR(mhi_cntrl->dev_state));
+		mhi_state_str(mhi_cntrl->dev_state));
mutex_unlock(&mhi_cntrl->pm_mutex); 
  }
@@ -689,7 +689,7 @@ static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl)
  exit_sys_error_transition:
  	dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n",
  		to_mhi_pm_state_str(mhi_cntrl->pm_state),
-		TO_MHI_STATE_STR(mhi_cntrl->dev_state));
+		mhi_state_str(mhi_cntrl->dev_state));
mutex_unlock(&mhi_cntrl->pm_mutex); 
  }
@@ -864,7 +864,7 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
  	if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
  		dev_err(dev,
  			"Did not enter M3 state, MHI state: %s, PM state: %s\n",
-			TO_MHI_STATE_STR(mhi_cntrl->dev_state),
+			mhi_state_str(mhi_cntrl->dev_state),
  			to_mhi_pm_state_str(mhi_cntrl->pm_state));
  		return -EIO;
  	}
@@ -890,7 +890,7 @@ static int __mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force)
dev_dbg(dev, "Entered with PM state: %s, MHI state: %s\n", 
  		to_mhi_pm_state_str(mhi_cntrl->pm_state),
-		TO_MHI_STATE_STR(mhi_cntrl->dev_state));
+		mhi_state_str(mhi_cntrl->dev_state));
if (mhi_cntrl->pm_state == MHI_PM_DISABLE) 
  		return 0;
@@ -900,7 +900,7 @@ static int __mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force)
if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) { 
  		dev_warn(dev, "Resuming from non M3 state (%s)\n",
-			 TO_MHI_STATE_STR(mhi_get_mhi_state(mhi_cntrl)));
+			 mhi_state_str(mhi_get_mhi_state(mhi_cntrl)));
  		if (!force)
  			return -EINVAL;
  	}
@@ -937,7 +937,7 @@ static int __mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force)
  	if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
  		dev_err(dev,
  			"Did not enter M0 state, MHI state: %s, PM state: %s\n",
-			TO_MHI_STATE_STR(mhi_cntrl->dev_state),
+			mhi_state_str(mhi_cntrl->dev_state),
  			to_mhi_pm_state_str(mhi_cntrl->pm_state));
  		return -EIO;
  	}
@@ -1088,7 +1088,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
state = mhi_get_mhi_state(mhi_cntrl); 
  	dev_dbg(dev, "Attempting power on with EE: %s, state: %s\n",
-		TO_MHI_EXEC_STR(current_ee), TO_MHI_STATE_STR(state));
+		TO_MHI_EXEC_STR(current_ee), mhi_state_str(state));
if (state == MHI_STATE_SYS_ERR) { 
  		mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
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