linux-kernel - [PATCH v6 4/5] thermal: bang-bang governor: act on lower trip boundary

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Message-Id: <1466584925-4829-5-git-send-email-wxt@rock-chips.com>
Date:	Wed, 22 Jun 2016 16:42:04 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	edubezval@...il.com, linux-pm@...r.kernel.org
Cc:	Heiko Stuebner <heiko@...ech.de>, dianders@...omium.org,
	briannorris@...gle.com, smbarber@...gle.com,
	linux-rockchip@...ts.infradead.org, cf@...k-chips.com,
	huangtao@...k-chips.com, dmitry.torokhov@...il.com,
	javi.merino@....com, peter@...e.net, rocky.hao@...k-chips.com,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Caesar Wang <wxt@...k-chips.com>,
	Zhang Rui <rui.zhang@...el.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v6 4/5] thermal: bang-bang governor: act on lower trip boundary

From: Sascha Hauer <s.hauer@...gutronix.de>

With interrupt driven thermal zones we pass the lower and upper
temperature on which shall be acted, so in the governor we have to act on
the exact lower temperature to be consistent. Otherwise an interrupt maybe
generated on the exact lower temperature, but the bang bang governor does
not react since The polling driven zones have to be one step cooler before
the governor reacts.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Caesar Wang <wxt@...k-chips.com>
Cc: Zhang Rui <rui.zhang@...el.com>
Cc: Eduardo Valentin <edubezval@...il.com>
Cc: linux-pm@...r.kernel.org
Acked-by: Peter Feuerer <peter@...e.net>

---

Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3:
- Add the peter's ACK.

Changes in v2:
- Update the commit for patch[v2 4/5].

 drivers/thermal/gov_bang_bang.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c
index fc52016..5073871 100644
--- a/drivers/thermal/gov_bang_bang.c
+++ b/drivers/thermal/gov_bang_bang.c
@@ -65,7 +65,7 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
 		if (instance->target == 0 && tz->temperature >= trip_temp)
 			instance->target = 1;
 		else if (instance->target == 1 &&
-				tz->temperature < trip_temp - trip_hyst)
+				tz->temperature <= trip_temp - trip_hyst)
 			instance->target = 0;
 
 		dev_dbg(&instance->cdev->device, "target=%d\n",
-- 
1.9.1