linux-kernel - [PATCH 1/1] thermal/drivers/imx_sc_thermal: return -EAGAIN when SCFW turn off resource

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Message-Id: <20230712210505.1536416-1-Frank.Li@nxp.com>
Date:   Wed, 12 Jul 2023 17:05:04 -0400
From:   Frank Li <Frank.Li@....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>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-pm@...r.kernel.org (open list:THERMAL),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX
        / MXC ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Cc:     imx@...ts.linux.dev
Subject: [PATCH 1/1] thermal/drivers/imx_sc_thermal: return -EAGAIN when SCFW turn off resource

Avoid endless print following message when SCFW turns off resource.
 [ 1818.342337] thermal thermal_zone0: failed to read out thermal zone (-1)

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/thermal/imx_sc_thermal.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
index 8d6b4ef23746..0533d58f199f 100644
--- a/drivers/thermal/imx_sc_thermal.c
+++ b/drivers/thermal/imx_sc_thermal.c
@@ -58,7 +58,9 @@ static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 	hdr->size = 2;
 
 	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
-	if (ret)
+	if (ret == -EPERM) /* NO POWER */
+		return -EAGAIN;
+	else if (ret)
 		return ret;
 
 	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
-- 
2.34.1