Re: [PATCH v6 08/12] power: supply: smb347-charger: Add missing pin control activation

Sebastian Reichel
2021-08-06T21:14:07Z

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Hi,

On Sat, Jul 31, 2021 at 08:38:38PM +0300, Dmitry Osipenko wrote:
> Pin control needs to be activated by setting the enable bit, otherwise
> hardware rejects all pin changes. Previously this stayed unnoticed on
> Nexus 7 because pin control was enabled by default after rebooting from
> downstream kernel, which uses driver that enables the bit and charger
> registers are non-volatile until power supply (battery) is disconnected.
> Configure the pin control enable bit. This fixes the potentially
> never-enabled charging on devices that use pin control.
>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> drivers/power/supply/smb347-charger.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/power/supply/smb347-charger.c b/drivers/power/supply/smb347-charger.c
> index 27254e6efdde..1c9205ca0993 100644
> --- a/drivers/power/supply/smb347-charger.c
> +++ b/drivers/power/supply/smb347-charger.c
> @@ -55,6 +55,7 @@
> #define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
> #define CFG_PIN_EN_APSD_IRQ BIT(1)
> #define CFG_PIN_EN_CHARGER_ERROR BIT(2)
> +#define CFG_PIN_EN_CTRL BIT(4)
> #define CFG_THERM 0x07
> #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
> #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
> @@ -726,6 +727,15 @@ static int smb347_hw_init(struct smb347_charger *smb)
> if (ret < 0)
> goto fail;
>
> + /* Activate pin control, making it writable. */
> + switch (smb->enable_control) {
> + case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
> + case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
> + ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL);
> + if (ret < 0)
> + goto fail;
> + }
> +
> /*
> * Make the charging functionality controllable by a write to the
> * command register unless pin control is specified in the platform
> --
> 2.32.0
>

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