* [PATCH v4] mfd: tps65910: Correct power-off programming sequence
@ 2020-11-15 20:45 Dmitry Osipenko
2020-11-27 7:43 ` Lee Jones
0 siblings, 1 reply; 2+ messages in thread
From: Dmitry Osipenko @ 2020-11-15 20:45 UTC (permalink / raw)
To: Tony Lindgren, Lee Jones, Thierry Reding, Jonathan Hunter,
Michał Mirosław, Zack Pearsall
Cc: linux-tegra, linux-omap, linux-kernel
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v4] mfd: tps65910: Correct power-off programming sequence
2020-11-15 20:45 [PATCH v4] mfd: tps65910: Correct power-off programming sequence Dmitry Osipenko
@ 2020-11-27 7:43 ` Lee Jones
0 siblings, 0 replies; 2+ messages in thread
From: Lee Jones @ 2020-11-27 7:43 UTC (permalink / raw)
To: Dmitry Osipenko
Cc: Tony Lindgren, Thierry Reding, Jonathan Hunter,
Michał Mirosław, Zack Pearsall, linux-tegra,
linux-omap, linux-kernel
On Sun, 15 Nov 2020, Dmitry Osipenko wrote:
> 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(-)
Applied, thanks.
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
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