[PATCH 2/2] thermal/drivers/qoriq: Power down TMU on system suspend

[Frank Li]

From: Alice Guo <alice.guo@xxxxxxx>

Enable power-down of TMU (Thermal Management Unit) for TMU version 2 during
system suspend to save power. Save approximately 4.3mW on VDD_ANA_1P8 on
i.MX93 platforms.

Signed-off-by: Alice Guo <alice.guo@xxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
 drivers/thermal/qoriq_thermal.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
index baf1b75b97cbe..d95e949321ce3 100644
--- a/drivers/thermal/qoriq_thermal.c
+++ b/drivers/thermal/qoriq_thermal.c
@@ -18,6 +18,7 @@
 #define SITES_MAX		16
 #define TMR_DISABLE		0x0
 #define TMR_ME			0x80000000
+#define TMR_CMD			BIT(29)
 #define TMR_ALPF		0x0c000000
 #define TMR_ALPF_V2		0x03000000
 #define TMTMIR_DEFAULT	0x0000000f
@@ -343,6 +344,12 @@ static int qoriq_tmu_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
+	if (data->ver > TMU_VER1) {
+		ret = regmap_set_bits(data->regmap, REGS_TMR, TMR_CMD);
+		if (ret)
+			return ret;
+	}
+
 	clk_disable_unprepare(data->clk);
 
 	return 0;
@@ -357,6 +364,12 @@ static int qoriq_tmu_resume(struct device *dev)
 	if (ret)
 		return ret;
 
+	if (data->ver > TMU_VER1) {
+		ret = regmap_clear_bits(data->regmap, REGS_TMR, TMR_CMD);
+		if (ret)
+			return ret;
+	}
+
 	/* Enable monitoring */
 	return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME);
 }
-- 
2.34.1