linux-kernel - [PATCH 5.18 491/879] thermal/drivers/bcm2711: Dont clamp temperature at zero

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Date:   Tue,  7 Jun 2022 19:00:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 491/879] thermal/drivers/bcm2711: Dont clamp temperature at zero

From: Stefan Wahren <stefan.wahren@...e.com>

[ Upstream commit 106e0121e243de4da7d634338089a68a8da2abe9 ]

The thermal sensor on BCM2711 is capable of negative temperatures, so don't
clamp the measurements at zero. Since this was the only use for variable t,
drop it.

This change based on a patch by Dom Cobley, who also tested the fix.

Fixes: 59b781352dc4 ("thermal: Add BCM2711 thermal driver")
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Acked-by: Florian Fainelli <f.fainelli@...il.com>
Link: https://lore.kernel.org/r/20220412195423.104511-1-stefan.wahren@i2se.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/thermal/broadcom/bcm2711_thermal.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/thermal/broadcom/bcm2711_thermal.c b/drivers/thermal/broadcom/bcm2711_thermal.c
index 1ec57d9ecf53..e9bef5c3414b 100644
--- a/drivers/thermal/broadcom/bcm2711_thermal.c
+++ b/drivers/thermal/broadcom/bcm2711_thermal.c
@@ -38,7 +38,6 @@ static int bcm2711_get_temp(void *data, int *temp)
 	int offset = thermal_zone_get_offset(priv->thermal);
 	u32 val;
 	int ret;
-	long t;
 
 	ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
 	if (ret)
@@ -50,9 +49,7 @@ static int bcm2711_get_temp(void *data, int *temp)
 	val &= AVS_RO_TEMP_STATUS_DATA_MSK;
 
 	/* Convert a HW code to a temperature reading (millidegree celsius) */
-	t = slope * val + offset;
-
-	*temp = t < 0 ? 0 : t;
+	*temp = slope * val + offset;
 
 	return 0;
 }
-- 
2.35.1