[edk2-devel] [PATCH V4 0/2] MdeModulePkg: Make the screen seamless

[Gao, Zhichao]

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.

V3:
Abandon V2. Directly set the output mode without clear the screen
while initialize the graphics console device. Add clear screen operation
in stop function of graphics console device.

V4:
Fix incorrect mode check in V3.
Initialize the mode to an invalid mode. If no perfer mode is found, it
is better to initialize its text mode to an invalid one.
Remove the ClearScreen fuction in the BindingStop function in V3.
The graphics output driver may disconnect before graphics console, that
may cause a system exception because of using released resource.
Impact: the screen would not be cleared after reconnect the graphics device
thru software, such as 'reconnect -r' in shell.

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

Aaron Antone (1):
  MdeModulePkg/ConSplitterDxe: Optimize the ConSplitterTextOutSetMode

Zhichao Gao (1):
  MdeModulePkg/GraphicsConsoleDxe: Initialize the output mode

 .../Console/ConSplitterDxe/ConSplitter.c      | 33 ++++++++++-----
 .../Console/ConSplitterDxe/ConSplitter.h      |  4 +-
 .../GraphicsConsoleDxe/GraphicsConsole.c      | 42 ++++++++++++++-----
 .../GraphicsConsoleDxe/GraphicsConsoleDxe.inf |  2 +
 4 files changed, 59 insertions(+), 22 deletions(-)

-- 
2.21.0.windows.1


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