1 files changed, 13 insertions, 9 deletions

diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index afd18173cca1..b941239671d6 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -1362,28 +1362,32 @@ static int ohci_start_iso(struct fw_iso_context *base,
 {
         struct iso_context *ctx = container_of(base, struct iso_context, base);
         struct fw_ohci *ohci = ctx->context.ohci;
-        u32 cycle_match = 0;
+        u32 control, match;
         int index;
 
         if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
                 index = ctx - ohci->it_context_list;
-                if (cycle > 0)
-                        cycle_match = IT_CONTEXT_CYCLE_MATCH_ENABLE |
+                match = 0;
+                if (cycle >= 0)
+                        match = IT_CONTEXT_CYCLE_MATCH_ENABLE |
                                 (cycle & 0x7fff) << 16;
 
                 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 1 << index);
                 reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);
-                context_run(&ctx->context, cycle_match);
+                context_run(&ctx->context, match);
         } else {
                 index = ctx - ohci->ir_context_list;
+                control = IR_CONTEXT_DUAL_BUFFER_MODE | IR_CONTEXT_ISOCH_HEADER;
+                match = (tags << 28) | (sync << 8) | ctx->base.channel;
+                if (cycle >= 0) {
+                        match |= (cycle & 0x07fff) << 12;
+                        control |= IR_CONTEXT_CYCLE_MATCH_ENABLE;
+                }
 
                 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 1 << index);
                 reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
-                reg_write(ohci, context_match(ctx->context.regs),
-                          (tags << 28) | (sync << 8) | ctx->base.channel);
-                context_run(&ctx->context,
-                            IR_CONTEXT_DUAL_BUFFER_MODE |
-                            IR_CONTEXT_ISOCH_HEADER);
+                reg_write(ohci, context_match(ctx->context.regs), match);
+                context_run(&ctx->context, control);
         }
 
         return 0;