From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because thermal_debug_cdev_state_update() only creates a duration record
for the old state of a cooling device, if its new state is used for the
first time, there will be no record for it and cdev_dt_seq_show() will
not print the duration information for it even though it contains code
to compute the duration value in that case.

Address this by making thermal_debug_cdev_state_update() create a
duration record for the new state if there is none.

Fixes: 755113d76786 ("thermal/debugfs: Add thermal cooling device debugfs information")
Reported-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/thermal/thermal_debugfs.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux-pm/drivers/thermal/thermal_debugfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_debugfs.c
+++ linux-pm/drivers/thermal/thermal_debugfs.c
@@ -433,6 +433,14 @@ void thermal_debug_cdev_state_update(con
 	}
 
 	cdev_dbg->current_state = new_state;
+
+	/*
+	 * Create a record for the new state if it is not there, so its
+	 * duration will be printed by cdev_dt_seq_show() as expected if it
+	 * runs before the next state transition.
+	 */
+	thermal_debugfs_cdev_record_get(thermal_dbg, cdev_dbg->durations, new_state);
+
 	transition = (old_state << 16) | new_state;
 
 	/*

On 4/25/24 15:03, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Because thermal_debug_cdev_state_update() only creates a duration record
> for the old state of a cooling device, if its new state is used for the
> first time, there will be no record for it and cdev_dt_seq_show() will
> not print the duration information for it even though it contains code
> to compute the duration value in that case.
> 
> Address this by making thermal_debug_cdev_state_update() create a
> duration record for the new state if there is none.
> 
> Fixes: 755113d76786 ("thermal/debugfs: Add thermal cooling device debugfs information")
> Reported-by: Lukasz Luba <lukasz.luba@arm.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>   drivers/thermal/thermal_debugfs.c |    8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> Index: linux-pm/drivers/thermal/thermal_debugfs.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_debugfs.c
> +++ linux-pm/drivers/thermal/thermal_debugfs.c
> @@ -433,6 +433,14 @@ void thermal_debug_cdev_state_update(con
>   	}
>   
>   	cdev_dbg->current_state = new_state;
> +
> +	/*
> +	 * Create a record for the new state if it is not there, so its
> +	 * duration will be printed by cdev_dt_seq_show() as expected if it
> +	 * runs before the next state transition.
> +	 */
> +	thermal_debugfs_cdev_record_get(thermal_dbg, cdev_dbg->durations, new_state);
> +
>   	transition = (old_state << 16) | new_state;
>   
>   	/*
> 
> 
> 
> 

Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>