Patch set updated for coreboot: nb/intel/x4x: Fix raminit unconditionally resetting

[Arthur Heymans]

Arthur Heymans ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17659

-gerrit

commit 0e25c1064809021d57db41fdfccdc659d3f9f879
Author: Arthur Heymans 
Date:   Wed Nov 30 18:40:38 2016 +0100

nb/intel/x4x: Fix raminit unconditionally resetting

The raminit only succeeds when it starts from a cold boot.
    To achieve this it unconditionally did a cold reset.
    Now it detects whether it underwent a hot reset (bit 8 of
    MCHBAR32(0xf14)) before issuing a cold reset to make raminit work.

It also adds a 2s delay before reset because some disk drives
    expect a warm reboot when the OS wants to reboot and therefore are not
    shut down properly / in time. If the drive is unexpectedly powered off
    which happens during a cold reset, it can cause data loss. Giving the
    drive 2 extra seconds can work around this issue.
    A proper fix would be to fix the raminit such that it works on a hot reset.

Change-Id: I6063dd6aed908558155d2523f35d7241ff1f4fde
    Signed-off-by: Arthur Heymans 
---
 src/northbridge/intel/x4x/raminit_ddr2.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/northbridge/intel/x4x/raminit_ddr2.c b/src/northbridge/intel/x4x/raminit_ddr2.c
index b3ee34a..de62517 100644
--- a/src/northbridge/intel/x4x/raminit_ddr2.c
+++ b/src/northbridge/intel/x4x/raminit_ddr2.c
@@ -258,10 +258,20 @@ static void checkreset_ddr2(struct sysinfo *s)
 {
    u8 pmcon2;
    u8 reset = 0;
+	u32 pmir;

+	pmir = pci_read_config32(PCI_DEV(0, 0x1f, 0), 0xac);
    pmcon2 = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xa2);
-	if (!(pmcon2 & 0x80)) {
-		pmcon2 |= 0x80;
+
+	if ((MCHBAR32(0xf14) & (1 << 8))) {
+		printk(BIOS_DEBUG,
+			"Waiting two seconds for disks to timeout...\n");
+		mdelay(2000);
+		reset = 1;
+	}
+
+	if (pmcon2 & 0x80) {
+		pmcon2 &= ~0x80;
    	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xa2, pmcon2);
    	reset = 1;

@@ -273,10 +283,16 @@ static void checkreset_ddr2(struct sysinfo *s)
    }
    if (reset) {
    	printk(BIOS_DEBUG, "Reset...\n");
+		/* Do a global reset. only useful on ICH10 */
+		pmir |= (1 << 20);
+		pci_write_config32(PCI_DEV(0, 0x1f, 0), 0xac, pmir);
    	outb(0xe, 0xcf9);
    	asm ("hlt");
    }
-	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xa2, pmcon2 | 0x80);
+	pmir &= ~(1 << 20);
+	pmcon2 |= 0x80;
+	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xa2, pmcon2);
+	pci_write_config32(PCI_DEV(0, 0x1f, 0), 0xac, pmir);
 }

static void setioclk_ddr2(struct sysinfo *s)