amd64_edac: check only ECC bit in amd64_determine_edac_cap

Checking whether the machine is using ECC enabled DRAM is done through
testing the DimmEccEn bit in the DRAM Cfg Low register (F2x[1,0]90). Do
that instead of testing all bits from the DimmEccEn upwards.

Also, remove mci->edac_cap assignment and use value returned from
amd64_determine_edac_cap().

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index c36bf40..3b76605 100644 (file)
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -754,13 +754,13 @@ static void amd64_cpu_display_info(struct amd64_pvt *pvt)
 static enum edac_type amd64_determine_edac_cap(struct amd64_pvt *pvt)
 {
        int bit;
-       enum dev_type edac_cap = EDAC_NONE;
+       enum dev_type edac_cap = EDAC_FLAG_NONE;
 
        bit = (boot_cpu_data.x86 > 0xf || pvt->ext_model >= OPTERON_CPU_REV_F)
                ? 19
                : 17;
 
-       if (pvt->dclr0 >> BIT(bit))
+       if (pvt->dclr0 & BIT(bit))
                edac_cap = EDAC_FLAG_SECDED;
 
        return edac_cap;
@@ -3006,7 +3006,6 @@ static void amd64_setup_mci_misc_attributes(struct mem_ctl_info *mci)
 
        mci->mtype_cap          = MEM_FLAG_DDR2 | MEM_FLAG_RDDR2;
        mci->edac_ctl_cap       = EDAC_FLAG_NONE;
-       mci->edac_cap           = EDAC_FLAG_NONE;
 
        if (pvt->nbcap & K8_NBCAP_SECDED)
                mci->edac_ctl_cap |= EDAC_FLAG_SECDED;