cbmk/config/coreboot/default/patches/0008-nb-gm45-Fix-Angel-s-DDR2-RCOMP-fix-on-DDR3-boards.patch

From 27a07626b780182fad0a2fa5fb73e10578e157c8 Mon Sep 17 00:00:00 2001
From: Leah Rowe <info@minifree.org>
Date: Tue, 6 Aug 2024 00:50:24 +0100
Subject: [PATCH 08/18] nb/gm45: Fix Angel's DDR2 RCOMP fix on DDR3 boards

We add this patch:

commit commit_id_here
Author: Angel Pons <th3fanbus@gmail.com>
Date:   Mon May 10 22:40:59 2021 +0200

    nb/intel/gm45: Make DDR2 raminit work

This patch was original applied, in lbmk, only on coreboot/dell,
separately from coreboot/default, which was wasteful because it
meant having an entire coreboot tree just for a single board. We
did this, because the DDR2 RCOMP fix happened to break DDR3 init
on other boards.

What *this* new patch does on top of Angel's patch, is make sure
that their changes only apply to DDR2, while DDR3 behaviour remains
unchanged. This means that the Dell Latitude E6400 can be supported
in the main coreboot tree, within lbmk.

Essentially, this patch restores the old behaviour, prior to applying
Angel's patch, only when DDR3 memory is used.

Signed-off-by: Leah Rowe <info@minifree.org>
---
 src/northbridge/intel/gm45/raminit.c          | 161 +++++++++---------
 .../intel/gm45/raminit_rcomp_calibration.c    |   9 +-
 2 files changed, 88 insertions(+), 82 deletions(-)

diff --git a/src/northbridge/intel/gm45/raminit.c b/src/northbridge/intel/gm45/raminit.c
index df8f46fbbc..433db3a68c 100644
--- a/src/northbridge/intel/gm45/raminit.c
+++ b/src/northbridge/intel/gm45/raminit.c
@@ -1117,7 +1117,10 @@ static void dram_program_timings(const int spd_type, const timings_t *const timi
 				reg = (reg & ~(0xf << 10)) | (2 << 10);
 			else
 				reg = (reg & ~(0xf << 10)) | (3 << 10);
-			reg = (reg & ~(0x7 <<  5)) | (2 << 5);
+			if (spd_type == DDR2)
+				reg = (reg & ~(0x7 <<  5)) | (2 << 5);
+			else
+				reg = (reg & ~(0x7 <<  5)) | (3 << 5);
 		} else if (timings->mem_clock != MEM_CLOCK_1067MT) {
 			reg = (reg & ~(0x7 << 15)) | ((9 - timings->CAS) << 15);
 			reg = (reg & ~(0xf << 10)) | ((timings->CAS - 3) << 10);
@@ -2209,83 +2212,85 @@ void raminit(sysinfo_t *const sysinfo, const int s3resume)
 		raminit_write_training(timings->mem_clock, dimms, s3resume);
 	}
 
-	/*
-	 * Program hardcoded DDR2-800 RCOMP SRAM codes. This must be done
-	 * after receiver enable calibration, otherwise raminit sometimes
-	 * completes with non-working memory.
-	 */
-	mchbar_write32(0x0530, 0x06060005);
-	mchbar_write32(0x0680, 0x06060606);
-	mchbar_write32(0x0684, 0x08070606);
-	mchbar_write32(0x0688, 0x0e0e0c0a);
-	mchbar_write32(0x068c, 0x0e0e0e0e);
-	mchbar_write32(0x0698, 0x06060606);
-	mchbar_write32(0x069c, 0x08070606);
-	mchbar_write32(0x06a0, 0x0c0c0b0a);
-	mchbar_write32(0x06a4, 0x0c0c0c0c);
-
-	mchbar_write32(0x06c0, 0x02020202);
-	mchbar_write32(0x06c4, 0x03020202);
-	mchbar_write32(0x06c8, 0x04040403);
-	mchbar_write32(0x06cc, 0x04040404);
-	mchbar_write32(0x06d8, 0x02020202);
-	mchbar_write32(0x06dc, 0x03020202);
-	mchbar_write32(0x06e0, 0x04040403);
-	mchbar_write32(0x06e4, 0x04040404);
-
-	mchbar_write32(0x0700, 0x02020202);
-	mchbar_write32(0x0704, 0x03020202);
-	mchbar_write32(0x0708, 0x04040403);
-	mchbar_write32(0x070c, 0x04040404);
-	mchbar_write32(0x0718, 0x02020202);
-	mchbar_write32(0x071c, 0x03020202);
-	mchbar_write32(0x0720, 0x04040403);
-	mchbar_write32(0x0724, 0x04040404);
-
-	mchbar_write32(0x0740, 0x02020202);
-	mchbar_write32(0x0744, 0x03020202);
-	mchbar_write32(0x0748, 0x04040403);
-	mchbar_write32(0x074c, 0x04040404);
-	mchbar_write32(0x0758, 0x02020202);
-	mchbar_write32(0x075c, 0x03020202);
-	mchbar_write32(0x0760, 0x04040403);
-	mchbar_write32(0x0764, 0x04040404);
-
-	mchbar_write32(0x0780, 0x06060606);
-	mchbar_write32(0x0784, 0x09070606);
-	mchbar_write32(0x0788, 0x0e0e0c0b);
-	mchbar_write32(0x078c, 0x0e0e0e0e);
-	mchbar_write32(0x0798, 0x06060606);
-	mchbar_write32(0x079c, 0x09070606);
-	mchbar_write32(0x07a0, 0x0d0d0c0b);
-	mchbar_write32(0x07a4, 0x0d0d0d0d);
-
-	mchbar_write32(0x07c0, 0x06060606);
-	mchbar_write32(0x07c4, 0x09070606);
-	mchbar_write32(0x07c8, 0x0e0e0c0b);
-	mchbar_write32(0x07cc, 0x0e0e0e0e);
-	mchbar_write32(0x07d8, 0x06060606);
-	mchbar_write32(0x07dc, 0x09070606);
-	mchbar_write32(0x07e0, 0x0d0d0c0b);
-	mchbar_write32(0x07e4, 0x0d0d0d0d);
-
-	mchbar_write32(0x0840, 0x06060606);
-	mchbar_write32(0x0844, 0x08070606);
-	mchbar_write32(0x0848, 0x0e0e0c0a);
-	mchbar_write32(0x084c, 0x0e0e0e0e);
-	mchbar_write32(0x0858, 0x06060606);
-	mchbar_write32(0x085c, 0x08070606);
-	mchbar_write32(0x0860, 0x0c0c0b0a);
-	mchbar_write32(0x0864, 0x0c0c0c0c);
-
-	mchbar_write32(0x0880, 0x02020202);
-	mchbar_write32(0x0884, 0x03020202);
-	mchbar_write32(0x0888, 0x04040403);
-	mchbar_write32(0x088c, 0x04040404);
-	mchbar_write32(0x0898, 0x02020202);
-	mchbar_write32(0x089c, 0x03020202);
-	mchbar_write32(0x08a0, 0x04040403);
-	mchbar_write32(0x08a4, 0x04040404);
+	if (sysinfo->spd_type == DDR2) {
+		/*
+		 * Program hardcoded DDR2-800 RCOMP SRAM codes. This must be done
+		 * after receiver enable calibration, otherwise raminit sometimes
+		 * completes with non-working memory.
+		 */
+		mchbar_write32(0x0530, 0x06060005);
+		mchbar_write32(0x0680, 0x06060606);
+		mchbar_write32(0x0684, 0x08070606);
+		mchbar_write32(0x0688, 0x0e0e0c0a);
+		mchbar_write32(0x068c, 0x0e0e0e0e);
+		mchbar_write32(0x0698, 0x06060606);
+		mchbar_write32(0x069c, 0x08070606);
+		mchbar_write32(0x06a0, 0x0c0c0b0a);
+		mchbar_write32(0x06a4, 0x0c0c0c0c);
+
+		mchbar_write32(0x06c0, 0x02020202);
+		mchbar_write32(0x06c4, 0x03020202);
+		mchbar_write32(0x06c8, 0x04040403);
+		mchbar_write32(0x06cc, 0x04040404);
+		mchbar_write32(0x06d8, 0x02020202);
+		mchbar_write32(0x06dc, 0x03020202);
+		mchbar_write32(0x06e0, 0x04040403);
+		mchbar_write32(0x06e4, 0x04040404);
+
+		mchbar_write32(0x0700, 0x02020202);
+		mchbar_write32(0x0704, 0x03020202);
+		mchbar_write32(0x0708, 0x04040403);
+		mchbar_write32(0x070c, 0x04040404);
+		mchbar_write32(0x0718, 0x02020202);
+		mchbar_write32(0x071c, 0x03020202);
+		mchbar_write32(0x0720, 0x04040403);
+		mchbar_write32(0x0724, 0x04040404);
+
+		mchbar_write32(0x0740, 0x02020202);
+		mchbar_write32(0x0744, 0x03020202);
+		mchbar_write32(0x0748, 0x04040403);
+		mchbar_write32(0x074c, 0x04040404);
+		mchbar_write32(0x0758, 0x02020202);
+		mchbar_write32(0x075c, 0x03020202);
+		mchbar_write32(0x0760, 0x04040403);
+		mchbar_write32(0x0764, 0x04040404);
+
+		mchbar_write32(0x0780, 0x06060606);
+		mchbar_write32(0x0784, 0x09070606);
+		mchbar_write32(0x0788, 0x0e0e0c0b);
+		mchbar_write32(0x078c, 0x0e0e0e0e);
+		mchbar_write32(0x0798, 0x06060606);
+		mchbar_write32(0x079c, 0x09070606);
+		mchbar_write32(0x07a0, 0x0d0d0c0b);
+		mchbar_write32(0x07a4, 0x0d0d0d0d);
+
+		mchbar_write32(0x07c0, 0x06060606);
+		mchbar_write32(0x07c4, 0x09070606);
+		mchbar_write32(0x07c8, 0x0e0e0c0b);
+		mchbar_write32(0x07cc, 0x0e0e0e0e);
+		mchbar_write32(0x07d8, 0x06060606);
+		mchbar_write32(0x07dc, 0x09070606);
+		mchbar_write32(0x07e0, 0x0d0d0c0b);
+		mchbar_write32(0x07e4, 0x0d0d0d0d);
+
+		mchbar_write32(0x0840, 0x06060606);
+		mchbar_write32(0x0844, 0x08070606);
+		mchbar_write32(0x0848, 0x0e0e0c0a);
+		mchbar_write32(0x084c, 0x0e0e0e0e);
+		mchbar_write32(0x0858, 0x06060606);
+		mchbar_write32(0x085c, 0x08070606);
+		mchbar_write32(0x0860, 0x0c0c0b0a);
+		mchbar_write32(0x0864, 0x0c0c0c0c);
+
+		mchbar_write32(0x0880, 0x02020202);
+		mchbar_write32(0x0884, 0x03020202);
+		mchbar_write32(0x0888, 0x04040403);
+		mchbar_write32(0x088c, 0x04040404);
+		mchbar_write32(0x0898, 0x02020202);
+		mchbar_write32(0x089c, 0x03020202);
+		mchbar_write32(0x08a0, 0x04040403);
+		mchbar_write32(0x08a4, 0x04040404);
+	}
 
 	igd_compute_ggc(sysinfo);
 
diff --git a/src/northbridge/intel/gm45/raminit_rcomp_calibration.c b/src/northbridge/intel/gm45/raminit_rcomp_calibration.c
index b74765fd9c..5d4505e063 100644
--- a/src/northbridge/intel/gm45/raminit_rcomp_calibration.c
+++ b/src/northbridge/intel/gm45/raminit_rcomp_calibration.c
@@ -198,7 +198,7 @@ void raminit_rcomp_calibration(int ddr_type, const stepping_t stepping) {
 		reg = mchbar_read32(0x518);
 		lut_idx[channel][group][PULL_UP] = (reg >> 24) & 0x7f;
 		lut_idx[channel][group][PULL_DOWN] = (reg >> 16) & 0x7f;
-		if (i == 1) {
+		if ((i == 1) && (ddr_type == DDR2)) {
 			magic_comp[0] = (reg >> 8) & 0x3f;
 			magic_comp[1] = (reg >> 0) & 0x3f;
 		}
@@ -242,7 +242,8 @@ void raminit_rcomp_calibration(int ddr_type, const stepping_t stepping) {
 		}
 		mchbar += 0x0040;
 	}
-
-	mchbar_clrsetbits32(0x4d0, 0x3f << 26, magic_comp[0] << 26);
-	mchbar_clrsetbits32(0x4d0, 0x3f << 20, magic_comp[1] << 20);
+	if (ddr_type == DDR2) {
+		mchbar_clrsetbits32(0x4d0, 0x3f << 26, magic_comp[0] << 26);
+		mchbar_clrsetbits32(0x4d0, 0x3f << 20, magic_comp[1] << 20);
+	}
 }
-- 
2.39.5