acpi/nfit: rely on mce->misc to determine poison granularity

nfit_handle_mec() hardcode poison granularity at L1_CACHE_BYTES.
Instead, let the driver rely on mce->misc register to determine
the poison granularity.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Link: https://lore.kernel.org/r/20220422224508.440670-2-jane.chu@oracle.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/acpi/nfit/mce.c

@@ -32,6 +32,7 @@ static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
 	 */
 	mutex_lock(&acpi_desc_lock);
 	list_for_each_entry(acpi_desc, &acpi_descs, list) {
+		unsigned int align = 1UL << MCI_MISC_ADDR_LSB(mce->misc);
 		struct device *dev = acpi_desc->dev;
 		int found_match = 0;
 
@@ -63,8 +64,7 @@ static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
 
 		/* If this fails due to an -ENOMEM, there is little we can do */
 		nvdimm_bus_add_badrange(acpi_desc->nvdimm_bus,
-				ALIGN(mce->addr, L1_CACHE_BYTES),
-				L1_CACHE_BYTES);
+				ALIGN_DOWN(mce->addr, align), align);
 		nvdimm_region_notify(nfit_spa->nd_region,
 				NVDIMM_REVALIDATE_POISON);