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northbridge/amd/amdmct/mct_ddr3: Set SkewMemClk when both DCTs are in use 

When both DCTs of a node are in use the DRAM clocks should be skewed
with respect to one another in order to reduce cross-channel interference.

Set the clock skew bit according to the BKDG recommendations.

Change-Id: Ibcce54fc53b79beba2f790994bcf87cc0354213a
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12011
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Timothy Pearson 2015-06-26 17:49:25 -05:00 committed by Stefan Reinauer
parent f3aa375f44
commit dee6b1ff39
2 changed files with 34 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
View File

@ -2653,7 +2653,7 @@ static void DCTPreInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDC
/* Reset DCT registers */
ClearDCT_D(pMCTstat, pDCTstat, dct);
pDCTstat->stopDCT = 1; /*preload flag with 'disable' */
pDCTstat->stopDCT[dct] = 1; /* preload flag with 'disable' */
if (!is_fam15h()) {
/* Enable DDR3 support */
@ -2664,7 +2664,7 @@ static void DCTPreInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDC
/* Read the SPD information into the data structures */
if (mct_DIMMPresence(pMCTstat, pDCTstat, dct) < SC_StopError) {
printk(BIOS_DEBUG, "\t\tDCTInit_D: mct_DIMMPresence Done\n");
printk(BIOS_DEBUG, "\t\tDCTPreInit_D: mct_DIMMPresence Done\n");
}
}
@ -2690,17 +2690,40 @@ static void DCTInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDCTst
printk(BIOS_DEBUG, "\t\tDCTInit_D: AutoConfig_D Done\n");
if (PlatformSpec_D(pMCTstat, pDCTstat, dct) < SC_StopError) {
printk(BIOS_DEBUG, "\t\tDCTInit_D: PlatformSpec_D Done\n");
pDCTstat->stopDCT = 0;
if (!(pMCTstat->GStatus & (1 << GSB_EnDIMMSpareNW))) {
printk(BIOS_DEBUG, "\t\tDCTInit_D: StartupDCT_D\n");
StartupDCT_D(pMCTstat, pDCTstat, dct); /*yeaahhh! */
}
pDCTstat->stopDCT[dct] = 0;
}
}
}
}
if (pDCTstat->stopDCT) {
}
static void DCTFinalInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDCTstat, u8 dct)
{
uint32_t dword;
/* Finalize DRAM init on a single node */
if (is_fam15h()) {
/* Set memory clock skew if needed */
if (dct == 0) {
if (!pDCTstat->stopDCT[0] && !pDCTstat->stopDCT[1]) {
dword = Get_NB32_index_wait_DCT(pDCTstat->dev_dct, dct, 0x98, 0x0d0fe00a);
dword |= (0x1 << 4); /* SkewMemClk = 1 */
Set_NB32_index_wait_DCT(pDCTstat->dev_dct, dct, 0x98, 0x0d0fe00a, dword);
}
}
}
if (!pDCTstat->stopDCT[dct]) {
if (!(pMCTstat->GStatus & (1 << GSB_EnDIMMSpareNW))) {
printk(BIOS_DEBUG, "\t\tDCTFinalInit_D: StartupDCT_D Start\n");
StartupDCT_D(pMCTstat, pDCTstat, dct);
printk(BIOS_DEBUG, "\t\tDCTFinalInit_D: StartupDCT_D Done\n");
}
}
if (pDCTstat->stopDCT[dct]) {
dword = 1 << DisDramInterface;
Set_NB32_DCT(pDCTstat->dev_dct, dct, 0x94, dword);
@ -4358,6 +4381,7 @@ static void mct_initDCT(struct MCTStatStruc *pMCTstat,
/* Config. DCT0 for Ganged or unganged mode */
DCTInit_D(pMCTstat, pDCTstat, 0);
DCTFinalInit_D(pMCTstat, pDCTstat, 0);
if (pDCTstat->ErrCode == SC_FatalErr) {
/* Do nothing goto exitDCTInit; any fatal errors? */
} else {
@ -4367,6 +4391,7 @@ static void mct_initDCT(struct MCTStatStruc *pMCTstat,
err_code = pDCTstat->ErrCode; /* save DCT0 errors */
pDCTstat->ErrCode = 0;
DCTInit_D(pMCTstat, pDCTstat, 1);
DCTFinalInit_D(pMCTstat, pDCTstat, 1);
if (pDCTstat->ErrCode == 2) /* DCT1 is not Running */
pDCTstat->ErrCode = err_code; /* Using DCT0 Error code to update pDCTstat.ErrCode */
} else {

2
src/northbridge/amd/amdmct/mct_ddr3/mct_d.h
View File

@ -334,7 +334,7 @@ struct DCTStatStruc { /* A per Node structure*/
u8 Node_ID; /* Node ID of current controller */
uint8_t Internal_Node_ID; /* Internal Node ID of the current controller */
uint8_t Dual_Node_Package; /* 1=Dual node package (G34) */
uint8_t stopDCT; /* Set if the DCT will be stopped */
uint8_t stopDCT[2]; /* Set if the DCT will be stopped */
u8 ErrCode; /* Current error condition of Node
0= no error
1= Variance Error, DCT is running but not in an optimal configuration.