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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2014-07-23 20:08:12 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2014-07-23 20:11:19 +0200 |
| commit | d584a66279949561418c82b12bb4c055e6c25836 (patch) | |
| tree | 52811b3c7c9854f68fc6988cd885a0de1101f804 /drivers/firewire | |
| parent | 655fc39bf40331e13503bed85c9ed0278bc35575 (diff) | |
| download | linux-d584a66279949561418c82b12bb4c055e6c25836.tar.bz2 | |
firewire: ohci: disable MSI for VIA VT6315 again
Revert half of commit d151f9854f21: If isochronous I/O is attempted with
packets larget than 1 kByte, VIA VT6315 rev 01 immediately stops to generate
any interrupts if MSI are used. Fix this by going back to legacy interrupts.
[Thread "Isochronous streaming with VT6315 OHCI",
http://marc.info/?t=139049641500003]
With smaller packets, the loss of IRQs happens too but only very rarely ---
rarely eneough that it was not yet possible for me to determine whether
QUIRK_NO_MSI is an actual fix for this rare variation of this chip bug.
I am keeping QUIRK_CYCLE_TIMER off of VT6315 rev >= 1 because this has been
verified by myself with certainty. On the other hand, I am also keeping
QUIRK_CYCLE_TIMER on for VT6315 rev 0 because I don't know at this time
whether this revision accesses Cycle Timer non-atomically like most of the
other VIA OHCIs are known to do.
Reported-by: Rémy Bruno <remy-fw@remy.trinnov.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/ohci.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 5b0934d0d968..41df806e9e80 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -336,10 +336,10 @@ static const struct { QUIRK_CYCLE_TIMER | QUIRK_IR_WAKE}, {PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT6315, 0, - QUIRK_CYCLE_TIMER | QUIRK_NO_MSI}, + QUIRK_CYCLE_TIMER /* FIXME: necessary? */ | QUIRK_NO_MSI}, {PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT6315, PCI_ANY_ID, - 0}, + QUIRK_NO_MSI}, {PCI_VENDOR_ID_VIA, PCI_ANY_ID, PCI_ANY_ID, QUIRK_CYCLE_TIMER | QUIRK_NO_MSI}, |