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>

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;