** Tags added: verification-done-bionic

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https://bugs.launchpad.net/bugs/1768761

Title:
  linux-snapdragon: reduce EPROBEDEFER noise during boot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  IMPACT:

  During boot, after the rootfs is mounted, the linux-snapdragon kernel
  prints several lines like these:

  ...
  [    5.258027] qcom-apq8016-sbc 7702000.sound: error getting codec dai name
  [    5.258052] qcom-apq8016-sbc 7702000.sound: Error resolving dai links: -517
  [    5.274320] msm_dsi_manager_register: failed to register mipi dsi host for 
DSI 0
  [    5.274451] msm 1a00000.mdss: failed to bind 1a98000.dsi (ops dsi_ops): 
-517
  [    5.300115] qcom-apq8016-sbc 7702000.sound: error getting codec dai name
  [    5.300140] qcom-apq8016-sbc 7702000.sound: Error resolving dai links: -517
  [    5.733725] msm_dsi_manager_register: failed to register mipi dsi host for 
DSI 0
  [    5.733841] msm 1a00000.mdss: failed to bind 1a98000.dsi (ops dsi_ops): 
-517
  [    5.760228] qcom-apq8016-sbc 7702000.sound: error getting codec dai name
  [    5.760252] qcom-apq8016-sbc 7702000.sound: Error resolving dai links: -517
  [    6.146074] msm_dsi_manager_register: failed to register mipi dsi host for 
DSI 0
  ...

  these are the audio and drm modules failing to attach due to the
  adv7511 i2c bridge missing - they will retry several times, until the
  adv7511_drm is finally loaded and these messages disappear.

  While both audio and video work fine in the end, these lines make
  parsing the boot logs harder and might fool a user to think there's a
  potential problem.

  FIX:

  To fix it, make the config DRM_I2C_ADV7511=y.

  HOW TO REPRODUCE:

  Boot a patched kernel and check the boot logs.

  REGRESSION POTENTIAL:

  Probably none.

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