** Tags added: qdf2400

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https://bugs.launchpad.net/bugs/1689818

Title:
  tty: pl011: fix earlycon work-around for QDF2400 erratum 44

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  The work-around for the Qualcomm Datacenter Technologies QDF2400 erratum 44 
sets the qdf2400_e44_present" global variable if the work-around is needed. 
However, this check does not happen until after earlycon is initialized, which 
means the work-around is not used, and the console hangs as soon as it displays 
one character.

  [Test Case]
  Enable earlycon and boot the kernel.

  [Regression Potential]
  This impacts only Qualcomm Datacenter Technologies QDF2400 platforms.

  [Fix]
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e53e597fd4c4a0b6ae58e57d76a240927fd17eaa

  https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h
  =tty-testing&id=5a0722b898f851b9ef108ea7babc529e4efc773d

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