firewire: add CSR CYCLE_TIME write support

The specification requires that CYCLE_TIME is writable so that it can be
initialized, so we better implement it.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index a55fbbce9e79..777811a736b2 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1996,6 +1996,13 @@ static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
                 flush_writes(ohci);
                 break;
 
+        case CSR_CYCLE_TIME:
+                reg_write(ohci, OHCI1394_IsochronousCycleTimer, value);
+                reg_write(ohci, OHCI1394_IntEventSet,
+                          OHCI1394_cycleInconsistent);
+                flush_writes(ohci);
+                break;
+
         default:
                 WARN_ON(1);
                 break;