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ArmPlatformPkg: PCD to swap red/blue format for HDLCD

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This change adds a new PCD PcdArmHdlcdSwapBlueRedSelect
to swap values for HDLCD RED_SELECT and BLUE_SELECT registers
on platforms where blue and red hardware lines are swapped.

If set to TRUE in the platform dsc, HDLCD library will swap the values
while setting RED_SELECT and BLUE_SELECT registers. The default
value of the PCD is FALSE.

NOTE: The motive for this is that a discrepancy in the Red/Blue lines
exists between some VersatileExpress platforms.  Rather than have
divergent code, this build switch allows a simple, pragmatic solution.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Girish Pathak <girish.pathak@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Girish Pathak
2017-09-26 21:15:25 +01:00
committed by Leif Lindholm
parent fe787dfb0f
commit 268aad6744
3 changed files with 16 additions and 2 deletions
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4
ArmPlatformPkg/Library/HdLcd/HdLcd.inf
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@@ -2,7 +2,7 @@
#
# Component description file for HDLCD module
#
# Copyright (c) 2011-2012, ARM Ltd. All rights reserved.<BR>
# Copyright (c) 2011-2018, ARM Ltd. All rights reserved.<BR>
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -40,3 +40,5 @@
[FixedPcd]
gArmPlatformTokenSpaceGuid.PcdArmHdLcdBase
gArmPlatformTokenSpaceGuid.PcdArmHdLcdSwapBlueRedSelect