[PATCH 6.1 0749/1146] thermal/drivers/imx8mm_thermal: Validate temperature range

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From: Marcus Folkesson <marcus.folkesson@xxxxxxxxx>

[ Upstream commit d37edc7370273306d8747097fafa62436c1cfe16 ]

Check against the upper temperature limit (125 degrees C) before
consider the temperature valid.

Fixes: 5eed800a6811 ("thermal: imx8mm: Add support for i.MX8MM thermal monitoring unit")
Signed-off-by: Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
Reviewed-by: Jacky Bai <ping.bai@xxxxxxx>
Link: https://lore.kernel.org/r/20221014073507.1594844-1-marcus.folkesson@xxxxxxxxx
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/thermal/imx8mm_thermal.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c
index e2c2673025a7..258d988b266d 100644
--- a/drivers/thermal/imx8mm_thermal.c
+++ b/drivers/thermal/imx8mm_thermal.c
@@ -65,8 +65,14 @@ static int imx8mm_tmu_get_temp(void *data, int *temp)
 	u32 val;
 
 	val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
+
+	/*
+	 * Do not validate against the V bit (bit 31) due to errata
+	 * ERR051272: TMU: Bit 31 of registers TMU_TSCR/TMU_TRITSR/TMU_TRATSR invalid
+	 */
+
 	*temp = val * 1000;
-	if (*temp < VER1_TEMP_LOW_LIMIT)
+	if (*temp < VER1_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
 		return -EAGAIN;
 
 	return 0;
-- 
2.35.1






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