For now most platforms support display function at PEI phase.
But the conspliter and graphics console driver would clear the
screen at BDS connect console phase. Maybe some platforms would
show logo in the next or maybe not. For consumers, it looks like
the screen flashed.
So change the behavior of graphics console devices while connect
console devices to maintain seamless screen from PEI.

Test has done on MinPlatform Kabylake-RVP3 which support PEI
display.

V2:
Make the SetMode not clear the screen only at the first boot during
the first conncettion of graphics device.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Laszlo Ersek <lersek@redhat.com>

Aaron Antone (2):
  MdeModulePkg/ConSplitterDxe: Optimize the ConSplitterTextOutSetMode
  MdeModulePkg/GraphicsConsoleDxe: Do not clean the screen

 .../Console/ConSplitterDxe/ConSplitter.c      | 34 +++++---
 .../Console/ConSplitterDxe/ConSplitter.h      |  4 +-
 .../GraphicsConsoleDxe/GraphicsConsole.c      | 82 +++++++++++++------
 .../GraphicsConsoleDxe/GraphicsConsoleDxe.inf |  3 +
 4 files changed, 88 insertions(+), 35 deletions(-)

-- 
2.21.0.windows.1


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