linux/drivers/firewire
Stefan Richter 02d37bed18 firewire: core: integrate software-forced bus resets with bus management
Bus resets which are triggered
  - by the kernel drivers after updates of the local nodes' config ROM,
  - by userspace software via ioctl
shall be deferred until after >=2 seconds after the last bus reset.

If multiple modifications of the local nodes' config ROM happen in a row,
only a single bus reset should happen after them.

When the local node's link goes from inactive to active or vice versa,
and at the two occasions of bus resets mentioned above --- and if the
current gap count differs from 63 --- the bus reset should be preceded
by a PHY configuration packet that reaffirms the gap count.  Otherwise a
bus manager would have to reset the bus again right after that.

This is necessary to promote bus stability, e.g. leave grace periods for
allocations and reallocations of isochronous channels and bandwidth,
SBP-2 reconnections etc.; see IEEE 1394 clause 8.2.1.

This change implements all of the above by moving bus reset initiation
into a delayed work (except for bus resets which are triggered by the
bus manager workqueue job and are performed there immediately).  It
comes with a necessary addition to the card driver methods that allows
to get the current gap count from PHY registers.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2010-07-13 09:58:27 +02:00
..
core-card.c firewire: core: integrate software-forced bus resets with bus management 2010-07-13 09:58:27 +02:00
core-cdev.c firewire: core: integrate software-forced bus resets with bus management 2010-07-13 09:58:27 +02:00
core-device.c firewire: cdev: fix fw_cdev_event_bus_reset emission after local config ROM changes 2010-07-13 09:47:47 +02:00
core-iso.c firewire: core: fix fw_send_request kerneldoc comment 2010-07-13 09:47:47 +02:00
core-topology.c firewire: core: fix fw_send_request kerneldoc comment 2010-07-13 09:47:47 +02:00
core-transaction.c firewire: core: integrate software-forced bus resets with bus management 2010-07-13 09:58:27 +02:00
core.h firewire: core: integrate software-forced bus resets with bus management 2010-07-13 09:58:27 +02:00
Kconfig firewire, ieee1394: update Kconfig help 2009-12-29 19:58:17 +01:00
Makefile firewire: net: add Kconfig item, rename driver 2009-06-14 14:26:29 +02:00
net.c firewire: remove an unused function argument 2010-06-20 23:11:55 +02:00
ohci.c firewire: core: integrate software-forced bus resets with bus management 2010-07-13 09:58:27 +02:00
ohci.h firewire: add CSR cmstr support 2010-06-10 08:36:37 +02:00
sbp2.c firewire: remove an unused function argument 2010-06-20 23:11:55 +02:00