linux-kernel - [PATCH v2] thermal: imx8mm_thermal: wait for a valid measurement

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Date:   Fri,  7 Oct 2022 09:30:57 +0200
From:   Marcus Folkesson <marcus.folkesson@...il.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>,
        Anson Huang <Anson.Huang@....com>
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH v2] thermal: imx8mm_thermal: wait for a valid measurement

Check if first measurement is still pending or if temperature is out of
range.
Return and try again later if that is the case.

Fixes: 5eed800a6811 ("thermal: imx8mm: Add support for i.MX8MM thermal monitoring unit")
Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---

Notes:
    v2: Also invalidate if temperature > max (125 degrees C)

 drivers/thermal/imx8mm_thermal.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c
index af666bd9e8d4..e42bf373cebc 100644
--- a/drivers/thermal/imx8mm_thermal.c
+++ b/drivers/thermal/imx8mm_thermal.c
@@ -62,11 +62,17 @@ static int imx8mm_tmu_get_temp(void *data, int *temp)
 {
 	struct tmu_sensor *sensor = data;
 	struct imx8mm_tmu *tmu = sensor->priv;
-	u32 val;
+	bool ready;
+	unsigned long val;
+
+	val = readl_relaxed(tmu->base + TRITSR);
+	ready = test_bit(probe_status_offset(1), &val);
+	if (!ready)
+		return -EAGAIN;
 
-	val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
+	val = val & TRITSR_TEMP0_VAL_MASK;
 	*temp = val * 1000;
-	if (*temp < VER1_TEMP_LOW_LIMIT)
+	if (*temp < VER1_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
 		return -EAGAIN;
 
 	return 0;
-- 
2.37.1