Patch set updated for coreboot: nb/amd/amdmct/mct_ddr3: Ensure channel clock skew is properly set

[Timothy Pearson]

Timothy Pearson ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/12055

-gerrit

commit 60e2466cbdfe7cef2d94fa0bc9481ac9722e221f
Author: Timothy Pearson 
Date:   Thu Aug 27 13:17:14 2015 -0500

nb/amd/amdmct/mct_ddr3: Ensure channel clock skew is properly set

Also fix incorrect Trfc[0-3] value on Family 15h.

Change-Id: Iafc233984ae1d44fe6a1cb5b109d36397cbd991a
    Signed-off-by: Timothy Pearson 
---
 src/northbridge/amd/amdmct/mct_ddr3/mct_d.c | 46 ++++++++++++++++-------------
 1 file changed, 25 insertions(+), 21 deletions(-)

diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
index 248fc65..74d5a8d 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
+++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
@@ -3068,6 +3068,23 @@ static void DCTInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDCTst
    	printk(BIOS_DEBUG, "\t\tDCTInit_D: mct_SPDCalcWidth Done\n");
    	if (AutoCycTiming_D(pMCTstat, pDCTstat, dct) < SC_StopError) {
    		printk(BIOS_DEBUG, "\t\tDCTInit_D: AutoCycTiming_D Done\n");
+
+			/* SkewMemClk must be set before MemClkFreqVal is set
+			 * This relies on DCTInit_D being called for DCT 1 after
+			 * it has already been called for DCT 0...
+			 */
+			if (is_fam15h()) {
+				/* Set memory clock skew if needed */
+				if (dct == 1) {
+					if (!pDCTstat->stopDCT[0]) {
+						printk(BIOS_DEBUG, "\t\tDCTInit_D: enabling intra-channel clock skew\n");
+						dword = Get_NB32_index_wait_DCT(pDCTstat->dev_dct, 0, 0x98, 0x0d0fe00a);
+						dword |= (0x1 << 4);				/* SkewMemClk = 1 */
+						Set_NB32_index_wait_DCT(pDCTstat->dev_dct, 0, 0x98, 0x0d0fe00a, dword);
+					}
+				}
+			}
+
    		if (AutoConfig_D(pMCTstat, pDCTstat, dct) < SC_StopError) {
    			printk(BIOS_DEBUG, "\t\tDCTInit_D: AutoConfig_D Done\n");
    			if (PlatformSpec_D(pMCTstat, pDCTstat, dct) < SC_StopError) {
@@ -3077,8 +3094,6 @@ static void DCTInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDCTst
    		}
    	}
    }
-
-
 }

static void DCTFinalInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDCTstat, u8 dct)
@@ -3086,17 +3101,6 @@ static void DCTFinalInit_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *p
    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");
@@ -3299,28 +3303,28 @@ static void SPD2ndTiming(struct MCTStatStruc *pMCTstat,
    		if (Twtr < val)
    			Twtr = val;

-			val = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Upper_tRAS_tRC] & 0xFF;
+			val = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Upper_tRAS_tRC] & 0xff;
    		val >>= 4;
    		val <<= 8;
-			val |= pDCTstat->spd_data.spd_bytes[dct + i][SPD_tRCmin] & 0xFF;
+			val |= pDCTstat->spd_data.spd_bytes[dct + i][SPD_tRCmin] & 0xff;
    		val *= MTB16x;
    		if (Trc < val)
    			Trc = val;

-			byte = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Density] & 0xF;
+			byte = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Density] & 0xf;
    		if (Trfc[LDIMM] < byte)
    			Trfc[LDIMM] = byte;

-			val = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Upper_tRAS_tRC] & 0xF;
+			val = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Upper_tRAS_tRC] & 0xf;
    		val <<= 8;
-			val |= (pDCTstat->spd_data.spd_bytes[dct + i][SPD_tRASmin] & 0xFF);
+			val |= (pDCTstat->spd_data.spd_bytes[dct + i][SPD_tRASmin] & 0xff);
    		val *= MTB16x;
    		if (Tras < val)
    			Tras = val;

-			val = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Upper_tFAW] & 0xF;
+			val = pDCTstat->spd_data.spd_bytes[dct + i][SPD_Upper_tFAW] & 0xf;
    		val <<= 8;
-			val |= pDCTstat->spd_data.spd_bytes[dct + i][SPD_tFAWmin] & 0xFF;
+			val |= pDCTstat->spd_data.spd_bytes[dct + i][SPD_tFAWmin] & 0xff;
    		val *= MTB16x;
    		if (Tfaw < val)
    			Tfaw = val;
@@ -3527,7 +3531,7 @@ static void SPD2ndTiming(struct MCTStatStruc *pMCTstat,
    	/* Trfc0-Trfc3 */
    	for (i=0; i<4; i++)
    		if (pDCTstat->Trfc[i] == 0x0)
-				pDCTstat->Trfc[i] = 0x4;
+				pDCTstat->Trfc[i] = 0x1;
    	dword = Get_NB32_DCT(dev, dct, 0x208);				/* DRAM Timing 2 */
    	dword &= ~(0x07070707);
    	dword |= (pDCTstat->Trfc[3] & 0x7) << 24;			/* Trfc3 */