ARM SCMI fix for v5.5

Just a single fix to correct the SCMI fast channel doorbell ring logic
 when CONFIG_64BIT is not set.
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Merge tag 'scmi-fix-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/drivers

ARM SCMI fix for v5.5

Just a single fix to correct the SCMI fast channel doorbell ring logic
when CONFIG_64BIT is not set.

* tag 'scmi-fix-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_scmi: Fix doorbell ring logic for !CONFIG_64BIT

Link: https://lore.kernel.org/r/20191114164555.GA19398@bogus
Signed-off-by: Olof Johansson <olof@lixom.net>

drivers/firmware/arm_scmi/perf.c

@@ -323,7 +323,7 @@ static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
 
 		if (db->mask)
 			val = ioread64_hi_lo(db->addr) & db->mask;
-		iowrite64_hi_lo(db->set, db->addr);
+		iowrite64_hi_lo(db->set | val, db->addr);
 	}
 #endif
 }