** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1797154
Title:
arm64: snapdragon: reduce boot noise
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Incomplete
Bug description:
Impact:
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
...
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 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 - all the other flavours
are untouched.
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