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

BugLink: http://bugs.launchpad.net/bugs/1519631

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: Hubert 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: Borislav Petkov <bp@suse.de>
(cherry picked from commit 45f4d3ab)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

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);