diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index dd8ef650a7cb..e0c6cce894cf 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -1003,7 +1003,12 @@ static u32 read_state_register(struct fw_card *card)
 	 *      reset, but then cleared when the units are ready again, which
 	 *      happens immediately for us.
 	 */
-	return 0;
+	u32 value = 0x0000;
+
+	/* Bit 8 (cmstr): */
+	value |= card->driver->read_csr_reg(card, CSR_STATE_CLEAR);
+
+	return value;
 }
 
 static void update_split_timeout(struct fw_card *card)
@@ -1034,6 +1039,8 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
 		if (tcode == TCODE_READ_QUADLET_REQUEST) {
 			*data = cpu_to_be32(read_state_register(card));
 		} else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
+			card->driver->write_csr_reg(card, CSR_STATE_CLEAR,
+						    be32_to_cpu(*data));
 		} else {
 			rcode = RCODE_TYPE_ERROR;
 		}
@@ -1043,7 +1050,8 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
 		if (tcode == TCODE_READ_QUADLET_REQUEST) {
 			*data = cpu_to_be32(read_state_register(card));
 		} else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
-			/* FIXME: implement cmstr */
+			card->driver->write_csr_reg(card, CSR_STATE_SET,
+						    be32_to_cpu(*data));
 			/* FIXME: implement abdicate */
 		} else {
 			rcode = RCODE_TYPE_ERROR;
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 3b8c0f042f49..aaecdd1c1767 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -40,6 +40,8 @@ struct fw_packet;
 
 #define FEATURE_PRIORITY_BUDGET		0x01
 
+#define CSR_STATE_BIT_CMSTR	(1 << 8)
+
 struct fw_card_driver {
 	/*
 	 * Enable the given card with the given initial config rom.
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 0e5413531785..1dcc2e427eb1 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -172,6 +172,7 @@ struct fw_ohci {
 	unsigned quirks;
 	unsigned int pri_req_max;
 	u32 bus_time;
+	bool is_root;
 
 	/*
 	 * Spinlock for accessing fw_ohci data.  Never call out of
@@ -1400,6 +1401,7 @@ static void bus_reset_tasklet(unsigned long data)
 	unsigned long flags;
 	void *free_rom = NULL;
 	dma_addr_t free_rom_bus = 0;
+	bool is_new_root;
 
 	reg = reg_read(ohci, OHCI1394_NodeID);
 	if (!(reg & OHCI1394_NodeID_idValid)) {
@@ -1413,6 +1415,12 @@ static void bus_reset_tasklet(unsigned long data)
 	ohci->node_id = reg & (OHCI1394_NodeID_busNumber |
 			       OHCI1394_NodeID_nodeNumber);
 
+	is_new_root = (reg & OHCI1394_NodeID_root) != 0;
+	if (!(ohci->is_root && is_new_root))
+		reg_write(ohci, OHCI1394_LinkControlSet,
+			  OHCI1394_LinkControl_cycleMaster);
+	ohci->is_root = is_new_root;
+
 	reg = reg_read(ohci, OHCI1394_SelfIDCount);
 	if (reg & OHCI1394_SelfIDCount_selfIDError) {
 		fw_notify("inconsistent self IDs\n");
@@ -2013,6 +2021,16 @@ static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset)
 	u32 value;
 
 	switch (csr_offset) {
+	case CSR_STATE_CLEAR:
+	case CSR_STATE_SET:
+		/* the controller driver handles only the cmstr bit */
+		if (ohci->is_root &&
+		    (reg_read(ohci, OHCI1394_LinkControlSet) &
+		     OHCI1394_LinkControl_cycleMaster))
+			return CSR_STATE_BIT_CMSTR;
+		else
+			return 0;
+
 	case CSR_NODE_IDS:
 		return reg_read(ohci, OHCI1394_NodeID) << 16;
 
@@ -2050,6 +2068,23 @@ static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
 	unsigned long flags;
 
 	switch (csr_offset) {
+	case CSR_STATE_CLEAR:
+		/* the controller driver handles only the cmstr bit */
+		if ((value & CSR_STATE_BIT_CMSTR) && ohci->is_root) {
+			reg_write(ohci, OHCI1394_LinkControlClear,
+				  OHCI1394_LinkControl_cycleMaster);
+			flush_writes(ohci);
+		}
+		break;
+
+	case CSR_STATE_SET:
+		if ((value & CSR_STATE_BIT_CMSTR) && ohci->is_root) {
+			reg_write(ohci, OHCI1394_LinkControlSet,
+				  OHCI1394_LinkControl_cycleMaster);
+			flush_writes(ohci);
+		}
+		break;
+
 	case CSR_NODE_IDS:
 		reg_write(ohci, OHCI1394_NodeID, value >> 16);
 		flush_writes(ohci);
diff --git a/drivers/firewire/ohci.h b/drivers/firewire/ohci.h
index 3bc9a5d744eb..0e6c5a466908 100644
--- a/drivers/firewire/ohci.h
+++ b/drivers/firewire/ohci.h
@@ -60,6 +60,7 @@
 #define   OHCI1394_LinkControl_cycleSource	(1 << 22)
 #define OHCI1394_NodeID                       0x0E8
 #define   OHCI1394_NodeID_idValid             0x80000000
+#define   OHCI1394_NodeID_root                0x40000000
 #define   OHCI1394_NodeID_nodeNumber          0x0000003f
 #define   OHCI1394_NodeID_busNumber           0x0000ffc0
 #define OHCI1394_PhyControl                   0x0EC