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  1. Bug #1863732
  2. Comment #0

Comment 0 for bug 1863732

Revision history for this message
Shrirang Bagul (shrirang-bagul) wrote :

[SRU Justification]

[Impact]

Dell Edge 300x IoT Gateways have a relative humidity sensor hts221. The sensor stops working (and reports stale values) after the system resumes from suspend-to-ram/suspend-to-disk PM states.

== Fix ==
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

This patch restores the AV_CONF & CTRL1 registers after

Already submitted upstream for both 4.17.y and 4.14.y (LTS) for review:
4.17.y: https://marc.info/?t=152455871600007&r=1&w=2
4.14.y: https://marc.info/?t=152506242000001&r=1&w=2

However, the issue is only affecting the Dell GW and not ST micro devel. boards.

== Risk of Regression ==
Low.Tthe bug affects only the Dell GW and the patch is being carried in linux-oem (4.15.y) since last 2 years without any regression.

This bug is for tracking purposes only, please don't triage.