firewire: ohci: initialize multiChanMode bits after reset

OHCI 1.1 says:
| Since the value of this bit is undefined after reset in all IR
| contexts, software shall initialize this bit to zero in all contexts
| whether or not active to maintain the exclusive nature of this bit.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 922cd26b25e3..c788dbdaf3bc 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2279,6 +2279,11 @@ static int ohci_enable(struct fw_card *card,
 
         ohci->bus_time_running = false;
 
+        for (i = 0; i < 32; i++)
+                if (ohci->ir_context_support & (1 << i))
+                        reg_write(ohci, OHCI1394_IsoRcvContextControlClear(i),
+                                  IR_CONTEXT_MULTI_CHANNEL_MODE);
+
         version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
         if (version >= OHCI_VERSION_1_1) {
                 reg_write(ohci, OHCI1394_InitialChannelsAvailableHi,