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authorBorislav Petkov <borislav.petkov@amd.com>2011-09-19 19:34:45 +0400
committerBorislav Petkov <borislav.petkov@amd.com>2011-10-06 14:34:05 +0400
commit73ba85937b2a07b6401ba0b7ca06a112762de9f7 (patch)
treef4905768cf9cc469b79e92a3c7cf9dec2c6079b1 /drivers/edac
parentb0b07a2bd4fbb6198d4e7142337214eeb77c417a (diff)
downloadlinux-73ba85937b2a07b6401ba0b7ca06a112762de9f7.tar.xz
amd64_edac: Add a fix for Erratum 505
When accessing the scrub rate control register (F3x58) on F15h, the DRAM controller selector (F1x10C[DctCfgSel]) has to point to DCT0 so that the scrub rate configuration can take effect. See Erratum 505 in the AMD F15h revision guide for more details. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Diffstat (limited to 'drivers/edac')
-rw-r--r--drivers/edac/amd64_edac.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 9bf0b6228529..367756a48ebe 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -114,10 +114,22 @@ static int f10_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
}
+/*
+ * Select DCT to which PCI cfg accesses are routed
+ */
+static void f15h_select_dct(struct amd64_pvt *pvt, u8 dct)
+{
+ u32 reg = 0;
+
+ amd64_read_pci_cfg(pvt->F1, DCT_CFG_SEL, &reg);
+ reg &= 0xfffffffe;
+ reg |= dct;
+ amd64_write_pci_cfg(pvt->F1, DCT_CFG_SEL, reg);
+}
+
static int f15_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
const char *func)
{
- u32 reg = 0;
u8 dct = 0;
if (addr >= 0x140 && addr <= 0x1a0) {
@@ -125,10 +137,7 @@ static int f15_read_dct_pci_cfg(struct amd64_pvt *pvt, int addr, u32 *val,
addr -= 0x100;
}
- amd64_read_pci_cfg(pvt->F1, DCT_CFG_SEL, &reg);
- reg &= 0xfffffffe;
- reg |= dct;
- amd64_write_pci_cfg(pvt->F1, DCT_CFG_SEL, reg);
+ f15h_select_dct(pvt, dct);
return __amd64_read_pci_cfg_dword(pvt->F2, addr, val, func);
}
@@ -198,6 +207,10 @@ static int amd64_set_scrub_rate(struct mem_ctl_info *mci, u32 bw)
if (boot_cpu_data.x86 == 0xf)
min_scrubrate = 0x0;
+ /* F15h Erratum #505 */
+ if (boot_cpu_data.x86 == 0x15)
+ f15h_select_dct(pvt, 0);
+
return __amd64_set_scrub_rate(pvt->F3, bw, min_scrubrate);
}
@@ -207,6 +220,10 @@ static int amd64_get_scrub_rate(struct mem_ctl_info *mci)
u32 scrubval = 0;
int i, retval = -EINVAL;
+ /* F15h Erratum #505 */
+ if (boot_cpu_data.x86 == 0x15)
+ f15h_select_dct(pvt, 0);
+
amd64_read_pci_cfg(pvt->F3, SCRCTRL, &scrubval);
scrubval = scrubval & 0x001F;