[thermal: thermal/next] thermal/drivers/imx8mm_thermal: Validate temperature range

["thermal-bot for Marcus Folkesson" <tip-bot2@linutronix.de>]

The following commit has been merged into the thermal/next branch of thermal:

Commit-ID:     86f0836ca9f6669993da7feba0a04d21506e05e0
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git//86f0836ca9f6669993da7feba0a04d21506e05e0
Author:        Marcus Folkesson <marcus.folkesson@gmail.com>
AuthorDate:    Fri, 14 Oct 2022 09:35:07 +02:00
Committer:     Daniel Lezcano <daniel.lezcano@kernel.org>
CommitterDate: Thu, 08 Dec 2022 14:30:43 +01:00

thermal/drivers/imx8mm_thermal: Validate temperature range

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@gmail.com>
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Link: https://lore.kernel.org/r/20221014073507.1594844-1-marcus.folkesson@gmail.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 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 68608d8..182cc20 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;