[coreboot-gerrit] Change in libgfxinit[master]: gma bdw+ transcoder: Use always-on path for primary pipe on eDP

[Nico Huber (Code Review)]

Hello Matt DeVillier,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/libgfxinit/+/34628

to review the following change.

Change subject: gma bdw+ transcoder: Use always-on path for primary pipe on eDP
......................................................................

gma bdw+ transcoder: Use always-on path for primary pipe on eDP

This was a mistake in abb16d9 (gma hsw transcoder: Choose PDW path for
scaling on DDI A). We only have to do it on HSW, future CPUs support
scaling on the always-on path and don't support the alternative path
anymore.

Change-Id: I257108fce40b73024f231ca366c0d53b700dc588
Signed-off-by: Nico Huber 
---
M common/hw-gfx-gma-transcoder.adb
1 file changed, 3 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/28/34628/1

diff --git a/common/hw-gfx-gma-transcoder.adb b/common/hw-gfx-gma-transcoder.adb
index 1e4952d..4970208 100644
--- a/common/hw-gfx-gma-transcoder.adb
+++ b/common/hw-gfx-gma-transcoder.adb
@@ -237,7 +237,9 @@
       Trans : Transcoder_Regs renames
                Transcoders (Get_Idx (Pipe, Port_Cfg.Port));
       EDP_Select : constant Word32 :=
-        (if Pipe = Primary and not Scale then
+        (if Pipe = Primary and
+            (not Config.Use_PDW_For_EDP_Scaling or else not Scale)
+         then
             DDI_FUNC_CTL_EDP_SELECT_ALWAYS_ON
          else
             DDI_FUNC_CTL_EDP_SELECT (Pipe));