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authorBen Collins <bcollins@ubuntu.com>2006-06-12 18:12:37 -0400
committerBen Collins <bcollins@ubuntu.com>2006-06-12 18:12:37 -0400
commit647dcb5fae0ebb5da1272ed2773df0d3f152c303 (patch)
tree31d6a6ab3fd8acb2dc9335dfa181972f4433158a /drivers/ieee1394/eth1394.c
parent57fdb58fa5a140bdd52cf4c4ffc30df73676f0a5 (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/ieee1394/eth1394.c')
-rw-r--r--drivers/ieee1394/eth1394.c6
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)
502 502
503 /* Determine speed limit */ 503 /* Determine speed limit */
504 for (i = 0; i < host->node_count; i++) 504 for (i = 0; i < host->node_count; i++)
505 if (max_speed > host->speed_map[NODEID_TO_NODE(host->node_id) * 505 if (max_speed > host->speed[i])
506 64 + i]) 506 max_speed = host->speed[i];
507 max_speed = host->speed_map[NODEID_TO_NODE(host->node_id) *
508 64 + i];
509 priv->bc_sspd = max_speed; 507 priv->bc_sspd = max_speed;
510 508
511 /* We'll use our maxpayload as the default mtu */ 509 /* We'll use our maxpayload as the default mtu */