On Thu, 2018-06-28 at 11:05 +0200, Lorenzo Bianconi wrote: > > AV_CONF register (RH & TEMP. oversampling ratio's) and CTRL1 register > > (ODR & BDU settings) values are lost after suspend. > > > > While the change in AV_CONF updates the sensor resolution modes > > (overriding the user configuration before the device went to suspend); > > loss of the contents of the CTRL1 register leads to failure in reading > > sensor output. > > > > This patch restores the AV_CONF & CTRL1 registers after resume. > > > > Hi Shrirang, > > I still suspect we have some hw issue (IoT Gateway) here (cc ST folks > to get more info) and anyway I guess the proposed patch will fix the issue > completely since OD and HL configuration is not restored properly. > Could you please double check HL/OD regs are properly preserved after resume > phase? Yes, certainly. Will include the i2c register dumps before and after the resume to support the patch.
Regards, Shrirang > > Regards, > Lorenzo > > > Changes from v1: > > - Don't drop enabling the sensor during resume > > - Restore AV_CONF register along with CTRL1 > > (As demonstrated with i2c register dumps of hts221 captured on Dell > > IoT Gateways 300x before suspend & after resume [1]) > > > > Fixes: ffebe74b7c95 (iio: humidity: hts221: avoid useless ODR > > reconfiguration) > > Signed-off-by: Shrirang Bagul <shrirang.ba...@canonical.com> > > > > [v1] https://marc.info/?l=linux-iio&m=152506543000442&w=2 > > [1] https://marc.info/?l=linux-iio&m=152534455701742&w=2 > > > > This patch is based on: > > git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git -b testing > > --- > > drivers/iio/humidity/hts221_core.c | 31 +++++++++++++++++++++++++++++- > > 1 file changed, 30 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/iio/humidity/hts221_core.c > > b/drivers/iio/humidity/hts221_core.c > > index 166946d4978d..fc5599497f55 100644 > > --- a/drivers/iio/humidity/hts221_core.c > > +++ b/drivers/iio/humidity/hts221_core.c > > @@ -656,14 +656,43 @@ static int __maybe_unused hts221_resume(struct device > > *dev) > > { > > struct iio_dev *iio_dev = dev_get_drvdata(dev); > > struct hts221_hw *hw = iio_priv(iio_dev); > > + const struct hts221_avg *avg; > > + u8 data, idx; > > int err = 0; > > > > + /* Restore contents of AV_CONF (RH & TEMP. oversampling ratio's) */ > > + avg = &hts221_avg_list[HTS221_SENSOR_H]; > > + idx = hw->sensors[HTS221_SENSOR_H].cur_avg_idx; > > + data = avg->avg_avl[idx]; > > + err = hts221_update_avg(hw, HTS221_SENSOR_H, data); > > + if (err < 0) > > + goto fail_err; > > + > > + avg = &hts221_avg_list[HTS221_SENSOR_T]; > > + idx = hw->sensors[HTS221_SENSOR_T].cur_avg_idx; > > + data = avg->avg_avl[idx]; > > + err = hts221_update_avg(hw, HTS221_SENSOR_T, data); > > + if (err < 0) > > + goto fail_err; > > just return err, no need for goto statement Okay. > > > + > > + /* Restore contents of CTRL1 (BDU & ODR) */ > > + err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR, > > + HTS221_BDU_MASK, > > + FIELD_PREP(HTS221_BDU_MASK, 1)); > > + if (err < 0) > > + goto fail_err; > > + > > + err = hts221_update_odr(hw, hw->odr); > > + if (err < 0) > > + goto fail_err; > > + > > just return err, no need for goto statement Okay. > > > if (hw->enabled) > > err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR, > > HTS221_ENABLE_MASK, > > FIELD_PREP(HTS221_ENABLE_MASK, > > true)); > > - return err; > > +fail_err: > > + return err < 0 ? err : 0; > > } > > > > const struct dev_pm_ops hts221_pm_ops = { > > -- > > 2.17.1 > >
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