Index: head/sys/dev/ahci/ahci.h
===================================================================
--- head/sys/dev/ahci/ahci.h
+++ head/sys/dev/ahci/ahci.h
@@ -598,6 +598,7 @@
 #define AHCI_Q_FORCE_PI		0x00040000
 #define AHCI_Q_RESTORE_CAP	0x00080000
 #define AHCI_Q_NOMSIX		0x00100000
+#define AHCI_Q_MRVL_SR_DEL	0x00200000
 
 #define AHCI_Q_BIT_STRING	\
 	"\020"			\
Index: head/sys/dev/ahci/ahci.c
===================================================================
--- head/sys/dev/ahci/ahci.c
+++ head/sys/dev/ahci/ahci.c
@@ -1598,6 +1598,14 @@
 		}
 
 		/*
+		 * Some Marvell controllers require additional time
+		 * after soft reset to work properly. Setup delay
+		 * to 50ms after soft reset.
+		 */
+		if (ch->quirks & AHCI_Q_MRVL_SR_DEL)
+			DELAY(50000);
+
+		/*
 		 * Marvell HBAs with non-RAID firmware do not wait for
 		 * readiness after soft reset, so we have to wait here.
 		 * Marvell RAIDs do not have this problem, but instead