linux-kernel - [PATCH v1] mfd: tps65910: Set PWR

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Date:   Wed, 24 Nov 2021 22:01:04 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Tony Lindgren <tony@...mide.com>, Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Svyatoslav Ryhel <clamor95@...il.com>
Cc:     linux-tegra@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] mfd: tps65910: Set PWR_OFF bit during driver probe

The PWR_OFF bit needs to be set in order to power off properly, without
hanging PMIC. This bit needs to be set early in order to allow thermal
protection of NVIDIA Terga SoCs to power off hardware properly, otherwise
a battery re-plug may be needed on some devices to recover after the hang.

Cc: <stable@...r.kernel.org>
Tested-by: Svyatoslav Ryhel <clamor95@...il.com> # ASUS TF201
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/mfd/tps65910.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index 6e105cca27d4..67e2707af4bc 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -436,15 +436,6 @@ static void tps65910_power_off(void)
 
 	tps65910 = dev_get_drvdata(&tps65910_i2c_client->dev);
 
-	/*
-	 * The PWR_OFF bit needs to be set separately, before transitioning
-	 * to the OFF state. It enables the "sequential" power-off mode on
-	 * TPS65911, it's a NO-OP on TPS65910.
-	 */
-	if (regmap_set_bits(tps65910->regmap, TPS65910_DEVCTRL,
-			    DEVCTRL_PWR_OFF_MASK) < 0)
-		return;
-
 	regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
 			   DEVCTRL_DEV_OFF_MASK | DEVCTRL_DEV_ON_MASK,
 			   DEVCTRL_DEV_OFF_MASK);
@@ -504,6 +495,19 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	tps65910_sleepinit(tps65910, pmic_plat_data);
 
 	if (pmic_plat_data->pm_off && !pm_power_off) {
+		/*
+		 * The PWR_OFF bit needs to be set separately, before
+		 * transitioning to the OFF state. It enables the "sequential"
+		 * power-off mode on TPS65911, it's a NO-OP on TPS65910.
+		 */
+		ret = regmap_set_bits(tps65910->regmap, TPS65910_DEVCTRL,
+				      DEVCTRL_PWR_OFF_MASK);
+		if (ret) {
+			dev_err(&i2c->dev, "failed to set power-off mode: %d\n",
+				ret);
+			return ret;
+		}
+
 		tps65910_i2c_client = i2c;
 		pm_power_off = tps65910_power_off;
 	}
-- 
2.33.1