Nico Huber has uploaded this change for review. ( https://review.coreboot.org/21216
Change subject: dp training: Allow to adjust pre-emphasis during clock recovery ......................................................................
dp training: Allow to adjust pre-emphasis during clock recovery
That's not demanded by the spec but there are sinks in the wild that need it.
Change-Id: Ibef5236ca771e0e02beb4e76650ffb6974657846 Signed-off-by: Nico Huber nico.h@gmx.de --- M common/hw-gfx-dp_training.adb 1 file changed, 3 insertions(+), 2 deletions(-)
git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/16/21216/1
diff --git a/common/hw-gfx-dp_training.adb b/common/hw-gfx-dp_training.adb index e7411d0..a2d00a7 100644 --- a/common/hw-gfx-dp_training.adb +++ b/common/hw-gfx-dp_training.adb @@ -257,8 +257,9 @@
-- According to DP spec, only change preemphasis during channel -- equalization. What to do if sink requests it during clock recovery? - -- Linux always accepts new values from the sink, we don't, for now. - if Success and then (CR_Was_Done and not EQ_Done) then + -- Linux always accepts new values from the sink, we too, now: There + -- are sinks in the wild that need this. + if Success and not EQ_Done then Train_Set.Pre_Emph := DP_Info.Max_Requested_Emph (Status, Link); if Train_Set.Pre_Emph > Max_Pre_Emph (Port, Train_Set)