From: Jonathan Cameron <jic23@kernel.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Chen-Yu Tsai <wens@csie.org>,
linux-iio@vger.kernel.org
Subject: Re: [PATCH v2] iio: adc: axp288: Fix TS-pin handling
Date: Sat, 12 Jan 2019 17:16:44 +0000 [thread overview]
Message-ID: <20190112171644.3fe8afd9@archlinux> (raw)
In-Reply-To: <20190105183618.6519-1-hdegoede@redhat.com>
On Sat, 5 Jan 2019 19:36:18 +0100
Hans de Goede <hdegoede@redhat.com> wrote:
> Prior to this commit there were 3 issues with our handling of the TS-pin:
>
> 1) There are 2 ways how the firmware can disable monitoring of the TS-pin
> for designs which do not have a temperature-sensor for the battery:
> a) Clearing bit 0 of the AXP20X_ADC_EN1 register
> b) Setting bit 2 of the AXP288_ADC_TS_PIN_CTRL monitoring
>
> Prior to this commit we were unconditionally setting both bits to the
> value used on devices with a TS. This causes the temperature protection to
> kick in on devices without a TS, such as the Jumper ezbook v2, causing
> them to not charge under Linux.
>
> This commit fixes this by using regmap_update_bits when updating these 2
> registers, leaving the 2 mentioned bits alone.
>
> The next 2 problems are related to our handling of the current-source
> for the TS-pin. The current-source used for the battery temp-sensor (TS)
> is shared with the GPADC. For proper fuel-gauge and charger operation the
> TS current-source needs to be permanently on. But to read the GPADC we
> need to temporary switch the TS current-source to ondemand, so that the
> GPADC can use it, otherwise we will always read an all 0 value.
>
> 2) Problem 2 is we were writing hardcoded values to the ADC TS pin-ctrl
> register, overwriting various other unrelated bits. Specifically we were
> overwriting the current-source setting for the TS and GPIO0 pins, forcing
> it to 80ųA independent of its original setting. On a Chuwi Vi10 tablet
> this was causing us to get a too high adc value (due to a too high
> current-source) resulting in the following errors being logged:
>
> ACPI Error: AE_ERROR, Returned by Handler for [UserDefinedRegion]
> ACPI Error: Method parse/execution failed \_SB.SXP1._TMP, AE_ERROR
>
> This commit fixes this by using regmap_update_bits to change only the
> relevant bits.
>
> 3) After reading the GPADC channel we were unconditionally enabling the
> TS current-source even on devices where the TS-pin is not used and the
> current-source thus was off before axp288_adc_read_raw call.
>
> This commit fixes this by making axp288_adc_set_ts a nop on devices where
> the ADC is not enabled for the TS-pin.
>
> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1610545
> Fixes: 3091141d7803 ("iio: adc: axp288: Fix the GPADC pin ...")
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Applied to the fixes-togreg branch of iio.git and marked for stable.
Thanks,
Jonathan
> ---
> Changes in v2:
> -Make sure we enable the TS current-source on probe when the TS pin is enabled
> ---
> drivers/iio/adc/axp288_adc.c | 76 ++++++++++++++++++++++++++++--------
> 1 file changed, 60 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c
> index 031d568b4972..4e339cfd0c54 100644
> --- a/drivers/iio/adc/axp288_adc.c
> +++ b/drivers/iio/adc/axp288_adc.c
> @@ -27,9 +27,18 @@
> #include <linux/iio/machine.h>
> #include <linux/iio/driver.h>
>
> -#define AXP288_ADC_EN_MASK 0xF1
> -#define AXP288_ADC_TS_PIN_GPADC 0xF2
> -#define AXP288_ADC_TS_PIN_ON 0xF3
> +/*
> + * This mask enables all ADCs except for the battery temp-sensor (TS), that is
> + * left as-is to avoid breaking charging on devices without a temp-sensor.
> + */
> +#define AXP288_ADC_EN_MASK 0xF0
> +#define AXP288_ADC_TS_ENABLE 0x01
> +
> +#define AXP288_ADC_TS_CURRENT_ON_OFF_MASK GENMASK(1, 0)
> +#define AXP288_ADC_TS_CURRENT_OFF (0 << 0)
> +#define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING (1 << 0)
> +#define AXP288_ADC_TS_CURRENT_ON_ONDEMAND (2 << 0)
> +#define AXP288_ADC_TS_CURRENT_ON (3 << 0)
>
> enum axp288_adc_id {
> AXP288_ADC_TS,
> @@ -44,6 +53,7 @@ enum axp288_adc_id {
> struct axp288_adc_info {
> int irq;
> struct regmap *regmap;
> + bool ts_enabled;
> };
>
> static const struct iio_chan_spec axp288_adc_channels[] = {
> @@ -115,21 +125,33 @@ static int axp288_adc_read_channel(int *val, unsigned long address,
> return IIO_VAL_INT;
> }
>
> -static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,
> - unsigned long address)
> +/*
> + * The current-source used for the battery temp-sensor (TS) is shared
> + * with the GPADC. For proper fuel-gauge and charger operation the TS
> + * current-source needs to be permanently on. But to read the GPADC we
> + * need to temporary switch the TS current-source to ondemand, so that
> + * the GPADC can use it, otherwise we will always read an all 0 value.
> + */
> +static int axp288_adc_set_ts(struct axp288_adc_info *info,
> + unsigned int mode, unsigned long address)
> {
> int ret;
>
> - /* channels other than GPADC do not need to switch TS pin */
> + /* No need to switch the current-source if the TS pin is disabled */
> + if (!info->ts_enabled)
> + return 0;
> +
> + /* Channels other than GPADC do not need the current source */
> if (address != AXP288_GP_ADC_H)
> return 0;
>
> - ret = regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
> + ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> + AXP288_ADC_TS_CURRENT_ON_OFF_MASK, mode);
> if (ret)
> return ret;
>
> /* When switching to the GPADC pin give things some time to settle */
> - if (mode == AXP288_ADC_TS_PIN_GPADC)
> + if (mode == AXP288_ADC_TS_CURRENT_ON_ONDEMAND)
> usleep_range(6000, 10000);
>
> return 0;
> @@ -145,14 +167,14 @@ static int axp288_adc_read_raw(struct iio_dev *indio_dev,
> mutex_lock(&indio_dev->mlock);
> switch (mask) {
> case IIO_CHAN_INFO_RAW:
> - if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_GPADC,
> + if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON_ONDEMAND,
> chan->address)) {
> dev_err(&indio_dev->dev, "GPADC mode\n");
> ret = -EINVAL;
> break;
> }
> ret = axp288_adc_read_channel(val, chan->address, info->regmap);
> - if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_ON,
> + if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON,
> chan->address))
> dev_err(&indio_dev->dev, "TS pin restore\n");
> break;
> @@ -164,13 +186,35 @@ static int axp288_adc_read_raw(struct iio_dev *indio_dev,
> return ret;
> }
>
> -static int axp288_adc_set_state(struct regmap *regmap)
> +static int axp288_adc_initialize(struct axp288_adc_info *info)
> {
> - /* ADC should be always enabled for internal FG to function */
> - if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON))
> - return -EIO;
> + int ret, adc_enable_val;
> +
> + /*
> + * Determine if the TS pin is enabled and set the TS current-source
> + * accordingly.
> + */
> + ret = regmap_read(info->regmap, AXP20X_ADC_EN1, &adc_enable_val);
> + if (ret)
> + return ret;
> +
> + if (adc_enable_val & AXP288_ADC_TS_ENABLE) {
> + info->ts_enabled = true;
> + ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> + AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
> + AXP288_ADC_TS_CURRENT_ON);
> + } else {
> + info->ts_enabled = false;
> + ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> + AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
> + AXP288_ADC_TS_CURRENT_OFF);
> + }
> + if (ret)
> + return ret;
>
> - return regmap_write(regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);
> + /* Turn on the ADC for all channels except TS, leave TS as is */
> + return regmap_update_bits(info->regmap, AXP20X_ADC_EN1,
> + AXP288_ADC_EN_MASK, AXP288_ADC_EN_MASK);
> }
>
> static const struct iio_info axp288_adc_iio_info = {
> @@ -200,7 +244,7 @@ static int axp288_adc_probe(struct platform_device *pdev)
> * Set ADC to enabled state at all time, including system suspend.
> * otherwise internal fuel gauge functionality may be affected.
> */
> - ret = axp288_adc_set_state(axp20x->regmap);
> + ret = axp288_adc_initialize(info);
> if (ret) {
> dev_err(&pdev->dev, "unable to enable ADC device\n");
> return ret;
prev parent reply other threads:[~2019-01-12 17:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-05 18:36 [PATCH v2] iio: adc: axp288: Fix TS-pin handling Hans de Goede
2019-01-12 17:16 ` Jonathan Cameron [this message]
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