diff options
author | Ben Collins <bcollins@ubuntu.com> | 2006-06-12 18:12:37 -0400 |
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committer | Ben Collins <bcollins@ubuntu.com> | 2006-06-12 18:12:37 -0400 |
commit | 647dcb5fae0ebb5da1272ed2773df0d3f152c303 (patch) | |
tree | 31d6a6ab3fd8acb2dc9335dfa181972f4433158a /drivers/base/bus.c | |
parent | 57fdb58fa5a140bdd52cf4c4ffc30df73676f0a5 (diff) |
ieee1394: support for slow links or slow 1394b phy ports
Add support for the following types of hardware:
+ nodes that have a link speed < PHY speed
+ 1394b PHYs that are less than S800 capable
+ 1394b/1394a adapter cable between two 1394b PHYs
Also, S1600 and S3200 are now supported if IEEE1394_SPEED_MAX is raised.
A probing function is added to nodemgr's config ROM fetching routine
which adjusts the allowable speed if an access problem was encountered.
Pros and Cons of the approach:
+ minimum code footprint to support this less widely used hardware
+ nearly no overhead for unaffected hardware
- ineffective before nodemgr began to read the ROM of affected nodes
- ineffective if ieee1394 is loaded with disable_nodemgr=1
The speed map CSRs which are published to the bus are not touched by the
patch.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Hakan Ardo <hakan@debian.org>
Cc: Calculex <linux@calculex.com>
Cc: Robert J. Kosinski <robk@cmcherald.com>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Diffstat (limited to 'drivers/base/bus.c')
0 files changed, 0 insertions, 0 deletions