EDAC, sb_edac: Set fixed DIMM width on Xeon Knights Landing

Knights Landing does not come with register that could be used to fetch
DIMM width. However the value is fixed for this architecture so it can
be hardcoded.
Signed-off-by: NHubert Chrzaniuk <hubert.chrzaniuk@intel.com>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: lukasz.anaczkowski@intel.com
Link: http://lkml.kernel.org/r/1449840082-18673-1-git-send-email-hubert.chrzaniuk@intel.comSigned-off-by: NBorislav Petkov <bp@suse.de>

drivers/edac/sb_edac.c

@@ -924,6 +924,12 @@ static enum mem_type haswell_get_memory_type(struct sbridge_pvt *pvt)
 	return mtype;
 }
 
+static enum dev_type knl_get_width(struct sbridge_pvt *pvt, u32 mtr)
+{
+	/* for KNL value is fixed */
+	return DEV_X16;
+}
+
 static enum dev_type sbridge_get_width(struct sbridge_pvt *pvt, u32 mtr)
 {
 	/* there's no way to figure out */
@@ -3393,7 +3399,7 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
 		pvt->info.interleave_list = knl_interleave_list;
 		pvt->info.max_interleave = ARRAY_SIZE(knl_interleave_list);
 		pvt->info.interleave_pkg = ibridge_interleave_pkg;
-		pvt->info.get_width = ibridge_get_width;
+		pvt->info.get_width = knl_get_width;
 		mci->ctl_name = kasprintf(GFP_KERNEL,
 			"Knights Landing Socket#%d", mci->mc_idx);