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SubjectRe: [PATCH v2] mfd: tps65910: Correct power-off programming sequence
On Sun, 24 May 2020, Dmitry Osipenko wrote:

> This patch fixes system shutdown on a devices that use TPS65910 as a
> system's power controller. 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 now shutting down properly.
>
> Tested-by: Zack Pearsall <zpearsall@yahoo.com>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>
> Changelog:
>
> v2: - Now using a single tps65910_reg_update_bits() instead of set+clear.
> Thanks to Michał Mirosław for the suggestion.

Michał should review.

> drivers/mfd/tps65910.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
> index 11959021b50a..3f4483dec871 100644
> --- a/drivers/mfd/tps65910.c
> +++ b/drivers/mfd/tps65910.c
> @@ -440,8 +440,13 @@ static void tps65910_power_off(void)
> DEVCTRL_PWR_OFF_MASK) < 0)
> return;
>
> - tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
> - DEVCTRL_DEV_ON_MASK);
> + if (tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
> + DEVCTRL_DEV_SLP_MASK) < 0)
> + return;
> +
> + tps65910_reg_update_bits(tps65910, TPS65910_DEVCTRL,
> + DEVCTRL_DEV_OFF_MASK | DEVCTRL_DEV_ON_MASK,
> + DEVCTRL_DEV_OFF_MASK);
> }
>
> static int tps65910_i2c_probe(struct i2c_client *i2c,

--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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