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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 <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/12072
Tested-by: build bot (Jenkins)
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
This commit is contained in:
Timothy Pearson 2015-09-13 15:54:32 -05:00 committed by Martin Roth
parent f8549e88e2
commit 273384638b
1 changed files with 8 additions and 0 deletions
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8
src/cpu/amd/family_10h-family_15h/defaults.h
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@ -840,4 +840,12 @@ static const struct {
{ 0xC0, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_ALL, { 0xC0, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_ALL,
0x40040000, 0xe01F0000 }, /* [31:29] RttCtl = 02h, 0x40040000, 0xe01F0000 }, /* [31:29] RttCtl = 02h,
[20:16] RttIndex = 04h */ [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 */
}; };