** Description changed:

  Impact:
  
- During boot on a Dragonboard410c using a recent Bionic or Cosmic kernel:
+ During boot on a Dragonboard410c using a recent Bionic or Cosmic kernel,
+ there's some noise like:
  
  ...
  [    3.665431] msm_dsi_phy 1a98300.dsi-phy: Failed to get supply 'vddio': -517
  [    3.669243] msm_dsi_phy 1a98300.dsi-phy: dsi_phy_regulator_init: failed to 
init regulator, ret=-517
  [    3.676180] msm_dsi_phy 1a98300.dsi-phy: dsi_phy_driver_probe: failed to 
init regulator
  ...
  
  or
  
  ...
  [    4.192280] qcom,pm8916-wcd-spmi-codec 200f000.spmi:pm8916@1:codec@f000: 
Failed to get supply 'vdd-cdc-io': -517
  [    4.195660] qcom,pm8916-wcd-spmi-codec 200f000.spmi:pm8916@1:codec@f000: 
Failed to get regulator supplies -517
  ...
  
- this is mainly because the DRM_MSM* and the SND_QCOM_MSM* were built-in,
- and tries to initialize before the voltage regulators are ready,
- spamming the boot log with useless noise.
+ and similar.
+ 
+ This is mainly due to DRM_MSM* and SND_QCOM_MSM* that were built-in, and
+ tries to initialize before the voltage regulators are ready to work,
+ resulting in a noisy bootlog.
  
  These patches factor out some code as modules, so when the kmods are
  loaded and initialized, regulators are already present and ready to
  attach - all these config changes shave around ~3K bytes from dmesg,
- making the bootlog more clear.
+ making the bootlog easir to parse.
  
  Fix:
  
  Apply the attached patches and recompile
  
  How to test:
  
  Boot a patched kernel and check for the above noise in dmesg
  
  Regression potential:
  
  None, we are just turning some code into kmods, and turning off a couple
- of not used feature for this flavour.
+ of not used feature for this flavour - all the other flavours are
+ untouched.

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1797154

Title:
  arm64: snapdragon: reduce boot noise

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797154/+subscriptions

-- 
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs

Reply via email to