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author | Jarod Wilson <jwilson@redhat.com> | 2008-03-07 01:43:31 -0500 |
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committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-04-18 17:55:33 +0200 |
commit | 17cff9ff871bb5081cade4f99a9e9382b9f1c01c (patch) | |
tree | f6bd2d184722b5796c1ada8a2b7790d615a6f194 /Documentation/spi/butterfly | |
parent | a5fd9ec7a29202f388fc011a11cfb0101d9f9a34 (diff) |
firewire: fw-sbp2: set dual-phase cycle_limit
Try to write dual-phase retry protocol limits to BUSY_TIMEOUT register.
- The dual-phase retry protocol is optional to implement, and if not
supported, writes to the dual-phase portion of the register will be
ignored. We try to write the original 1394-1995 default here.
- In the case of devices that are also SBP-3-compliant, all writes are
ignored, as the register is read-only, but contains single-phase retry of
15, which is what we're trying to set for all SBP-2 device anyway, so this
write attempt is safe and yields more consistent behavior for all devices.
See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
and section 6.4 of the SBP-3 spec for further details.
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'Documentation/spi/butterfly')
0 files changed, 0 insertions, 0 deletions