[SRU][M:raspi][PATCH] Fix hysteresis support in gov_step_wise.c (#5736)

[Juerg Haefliger]

From: Jürgen Kreileder <jk at blackdown.de>

BugLink: https://bugs.launchpad.net/bugs/2044341

Fix hysteresis support in gov_step_wise.c

Directly get hyst value instead of going through an
optional and, now, unimplemented function.

Signed-off-by: Jürgen Kreileder <jk at blackdown.de>
(cherry picked from commit d3668f4e7e2747f38d7f680df231f02dd33d3a13 rpi-6.5.y)
Signed-off-by: Juerg Haefliger <juerg.haefliger at canonical.com>
---
 drivers/thermal/gov_step_wise.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/thermal/gov_step_wise.c b/drivers/thermal/gov_step_wise.c
index eefeb6407d0f..8b83fbb933db 100644
--- a/drivers/thermal/gov_step_wise.c
+++ b/drivers/thermal/gov_step_wise.c
@@ -98,11 +98,8 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip_id
 		trace_thermal_zone_trip(tz, trip_id, trip.type);
 	}
 
-	hyst_temp = trip_temp = trip.temperature;
-	if (tz->ops->get_trip_hyst) {
-		tz->ops->get_trip_hyst(tz, trip_id, &hyst_temp);
-		hyst_temp = trip_temp - hyst_temp;
-	}
+	trip_temp = trip.temperature;
+	hyst_temp = trip_temp - trip.hysteresis;
 	trip_type = trip.type;
 
 	dev_dbg(&tz->device,
-- 
2.40.1