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authorClemens Ladisch <clemens@ladisch.de>2011-04-11 09:56:12 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2011-04-19 20:00:10 +0200
commitecf8328e59447b83a1f79628487e0e9f8801db84 (patch)
tree20ea90d6a38687a48c28ad185c612d0dece86e6f /drivers/firewire/ohci.c
parent115881d395959b75c8c3bb94913f2ce869b8aa7a (diff)
firewire: ohci: do not start DMA contexts before link is enabled
OHCI 1.1 5.7.3 not only forbids enabling or starting any DMA contexts before the linkEnable bit is set, but also explicitly warns of undefined behaviour if this order is violated. Don't violate it then. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/ohci.c')
-rw-r--r--drivers/firewire/ohci.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index f903d7b6f34..dfb3cb774a7 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2066,8 +2066,6 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
reg_write(ohci, OHCI1394_LinkControlSet,
- OHCI1394_LinkControl_rcvSelfID |
- OHCI1394_LinkControl_rcvPhyPkt |
OHCI1394_LinkControl_cycleTimerEnable |
OHCI1394_LinkControl_cycleMaster);
@@ -2094,9 +2092,6 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_FairnessControl, 0);
card->priority_budget_implemented = ohci->pri_req_max != 0;
- ar_context_run(&ohci->ar_request_ctx);
- ar_context_run(&ohci->ar_response_ctx);
-
reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
reg_write(ohci, OHCI1394_IntEventClear, ~0);
reg_write(ohci, OHCI1394_IntMaskClear, ~0);
@@ -2186,7 +2181,13 @@ static int ohci_enable(struct fw_card *card,
reg_write(ohci, OHCI1394_HCControlSet,
OHCI1394_HCControl_linkEnable |
OHCI1394_HCControl_BIBimageValid);
- flush_writes(ohci);
+
+ reg_write(ohci, OHCI1394_LinkControlSet,
+ OHCI1394_LinkControl_rcvSelfID |
+ OHCI1394_LinkControl_rcvPhyPkt);
+
+ ar_context_run(&ohci->ar_request_ctx);
+ ar_context_run(&ohci->ar_response_ctx); /* also flushes writes */
/* We are ready to go, reset bus to finish initialization. */
fw_schedule_bus_reset(&ohci->card, false, true);