linux-kernel - [PATCH v8 5/5] thermal: mediatek: try again if first temp read is bogus

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Message-Id: <20221018-up-i350-thermal-bringup-v8-5-23e8fbb08837@baylibre.com>
Date:   Wed, 25 Jan 2023 10:50:33 +0100
From:   Amjad Ouled-Ameur <aouledameur@...libre.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Fabien Parent <fparent@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Rob Herring <robh@...nel.org>,
        Markus Schneider-Pargmann <msp@...libre.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Amjad Ouled-Ameur <aouledameur@...libre.com>,
        Michael Kao <michael.kao@...iatek.com>
Subject: [PATCH v8 5/5] thermal: mediatek: try again if first temp read is bogus

In mtk_thermal_bank_temperature, return -EAGAIN instead of 0
on the first read of sensor that often are bogus values.

Signed-off-by: Michael Kao <michael.kao@...iatek.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Signed-off-by: Amjad Ouled-Ameur <aouledameur@...libre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/thermal/mtk_thermal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index b8e06f6c7c42..e7be450cd40a 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -736,7 +736,7 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
 		 * not immediately shut down.
 		 */
 		if (temp > 200000)
-			temp = 0;
+			temp = -EAGAIN;
 
 		if (temp > max)
 			max = temp;

-- 
2.39.1