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Subject[PATCH v4] mfd: tps65910: Correct power-off programming sequence
Date
Correct power-off programming sequence in order to fix shutting down
devices which are using TPS65910 PMIC.

In accordance to the TPS65910 datasheet, the PMIC's state-machine
transitions into the OFF state only when DEV_OFF bit of DEVCTRL_REG is
set. The ON / SLEEP states also should be cleared, otherwise PMIC won't
get into a proper state on shutdown. Devices like Nexus 7 tablet and Ouya
game console are shutting down properly now.

Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Zack Pearsall <zpearsall@yahoo.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---

Changelog:

v4: - Rebased on a recent linux-next.

v3: - Removed the DEV_SLP_MASK clearing and adding clarifying comment to
the code about why clearing PWR_OFF bit needs to be done, which was
suggested by Michał Mirosław in a review comment to v2.

- Added tested-by from Peter Geis who tested v3 on his Ouya game
console.

v2: - Now using a single tps65910_reg_update_bits() instead of set+clear.
Thanks to Michał Mirosław for the suggestion.

drivers/mfd/tps65910.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index ca0b61011def..6e105cca27d4 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -436,12 +436,18 @@ 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_clear_bits(tps65910->regmap, TPS65910_DEVCTRL,
- DEVCTRL_DEV_ON_MASK);
+ regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
+ DEVCTRL_DEV_OFF_MASK | DEVCTRL_DEV_ON_MASK,
+ DEVCTRL_DEV_OFF_MASK);
}

static int tps65910_i2c_probe(struct i2c_client *i2c,
--
2.29.2
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