15.05.2020 20:30, Dmitry Osipenko пишет: > 15.05.2020 16:30, Michał Mirosław пишет: >> On Thu, May 14, 2020 at 11:50:21PM +0300, 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@xxxxxxxxx> >>> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> >>> --- >>> drivers/mfd/tps65910.c | 12 ++++++++++-- >>> 1 file changed, 10 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c >>> index 11959021b50a..22116cee411d 100644 >>> --- a/drivers/mfd/tps65910.c >>> +++ b/drivers/mfd/tps65910.c >>> @@ -440,8 +440,16 @@ 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; >>> + >>> + if (tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL, >>> + DEVCTRL_DEV_ON_MASK) < 0) >>> + return; >>> + >>> + tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL, >>> + DEVCTRL_DEV_OFF_MASK); >>> } >> >> Isn't it enough to update the DEVCTRL with just one >> tps65910_reg_update_bits()? > > IIRC, we've tried that variant and it didn't work. Although, maybe it > was affected by some other changes that we were trying simultaneously, > so could be worthwhile to re-check it. Thank you for the comment! > We tried it once again and the variant with a single update_bits() for all bits doesn't work. The single update_bits() for the ON/OFF_MASK mask works, it's actually the same what downstream driver does [1]. [1] https://android.googlesource.com/kernel/tegra/+/refs/heads/android-tegra3-grouper-3.1-lollipop-release/drivers/mfd/tps6591x.c#374 I'll prepare a v2.
