From 273384638b4f4fbe8e500025d8941bd2e54b5f8a Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Sun, 13 Sep 2015 15:54:32 -0500 Subject: cpu/amd/fam10h-15h: Enable DFE on Family 15h HT3 links Decision Feedback Equalization (DFE) is a form of dynamic link training used to lower the overall error rate within the coherent fabric. Enable it on all capable HT links. Change-Id: I5e719984ddd723f9e375ff1a9d4fa1ef042cf3eb Signed-off-by: Timothy Pearson Reviewed-on: https://review.coreboot.org/12072 Tested-by: build bot (Jenkins) Reviewed-by: Felix Held Tested-by: Raptor Engineering Automated Test Stand --- src/cpu/amd/family_10h-family_15h/defaults.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src/cpu/amd') diff --git a/src/cpu/amd/family_10h-family_15h/defaults.h b/src/cpu/amd/family_10h-family_15h/defaults.h index 28df747971..57c05187f0 100644 --- a/src/cpu/amd/family_10h-family_15h/defaults.h +++ b/src/cpu/amd/family_10h-family_15h/defaults.h @@ -840,4 +840,12 @@ static const struct { { 0xC0, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_ALL, 0x40040000, 0xe01F0000 }, /* [31:29] RttCtl = 02h, [20:16] RttIndex = 04h */ + + { 0xc4, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_HT3, + 0x00013480, 0x0003fc80 }, /* [17:10] DCV = 0x4d, + [7] DfeEn = 0x1 */ + + { 0xd4, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_HT3, + 0x00013480, 0x0003fc80 }, /* [17:10] DCV = 0x4d, + [7] DfeEn = 0x1 */ }; -- cgit v1.2.3