diff options
| author | Ben Collins <bcollins@ubuntu.com> | 2006-06-13 02:12:37 +0400 |
|---|---|---|
| committer | Ben Collins <bcollins@ubuntu.com> | 2006-06-13 02:12:37 +0400 |
| commit | 647dcb5fae0ebb5da1272ed2773df0d3f152c303 (patch) | |
| tree | 31d6a6ab3fd8acb2dc9335dfa181972f4433158a /drivers/ieee1394/eth1394.c | |
| parent | 57fdb58fa5a140bdd52cf4c4ffc30df73676f0a5 (diff) | |
| download | linux-647dcb5fae0ebb5da1272ed2773df0d3f152c303.tar.xz | |
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/ieee1394/eth1394.c')
| -rw-r--r-- | drivers/ieee1394/eth1394.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/ieee1394/eth1394.c b/drivers/ieee1394/eth1394.c index 30fa0d43a43a..b2d2c4dd075b 100644 --- a/drivers/ieee1394/eth1394.c +++ b/drivers/ieee1394/eth1394.c @@ -502,10 +502,8 @@ static void ether1394_reset_priv (struct net_device *dev, int set_mtu) /* Determine speed limit */ for (i = 0; i < host->node_count; i++) - if (max_speed > host->speed_map[NODEID_TO_NODE(host->node_id) * - 64 + i]) - max_speed = host->speed_map[NODEID_TO_NODE(host->node_id) * - 64 + i]; + if (max_speed > host->speed[i]) + max_speed = host->speed[i]; priv->bc_sspd = max_speed; /* We'll use our maxpayload as the default mtu */ |