lkml.org 
[lkml]   [2020]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v1] mfd: tps65910: Correct power-off programming sequence
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@yahoo.com>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
> 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()?

Best Regards
Michał Mirosław

\
 
 \ /
  Last update: 2020-05-15 15:30    [W:0.068 / U:2.664 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site