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firewire: optimize gap count with 1394b leaf nodes 

Table-based gap count optimization cannot be used if 1394b repeater PHYs
are present.  But it does work with 1394b leaf nodes.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
This commit is contained in:
Stefan Richter 2007-06-18 19:44:12 +02:00
parent 25d83f583b
commit 24d40125f1
4 changed files with 14 additions and 17 deletions
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7
drivers/firewire/fw-card.c
View File

@ -336,8 +336,11 @@ fw_card_bm_work(struct work_struct *work)
}
pick_me:
/* Now figure out what gap count to set. */
if (card->topology_type == FW_TOPOLOGY_A &&
/*
* Pick a gap count from 1394a table E-1. The table doesn't cover
* the typically much larger 1394b beta repeater delays though.
*/
if (!card->beta_repeaters_present &&
card->root_node->max_hops < ARRAY_SIZE(gap_count_table))
gap_count = gap_count_table[card->root_node->max_hops];
else

16
drivers/firewire/fw-topology.c
View File

@ -172,7 +172,8 @@ static struct fw_node *build_tree(struct fw_card *card,
struct list_head stack, *h;
u32 *next_sid, *end, q;
int i, port_count, child_port_count, phy_id, parent_count, stack_depth;
int gap_count, topology_type;
int gap_count;
bool beta_repeaters_present;
local_node = NULL;
node = NULL;
@ -182,7 +183,7 @@ static struct fw_node *build_tree(struct fw_card *card,
phy_id = 0;
irm_node = NULL;
gap_count = SELF_ID_GAP_COUNT(*sid);
topology_type = 0;
beta_repeaters_present = false;
while (sid < end) {
next_sid = count_ports(sid, &port_count, &child_port_count);
@ -224,11 +225,6 @@ static struct fw_node *build_tree(struct fw_card *card,
if (SELF_ID_CONTENDER(q))
irm_node = node;
if (node->phy_speed == SCODE_BETA)
topology_type |= FW_TOPOLOGY_B;
else
topology_type |= FW_TOPOLOGY_A;
parent_count = 0;
for (i = 0; i < port_count; i++) {
@ -278,6 +274,10 @@ static struct fw_node *build_tree(struct fw_card *card,
list_add_tail(&node->link, &stack);
stack_depth += 1 - child_port_count;
if (node->phy_speed == SCODE_BETA &&
parent_count + child_port_count > 1)
beta_repeaters_present = true;
/*
* If all PHYs does not report the same gap count
* setting, we fall back to 63 which will force a gap
@ -295,7 +295,7 @@ static struct fw_node *build_tree(struct fw_card *card,
card->root_node = node;
card->irm_node = irm_node;
card->gap_count = gap_count;
card->topology_type = topology_type;
card->beta_repeaters_present = beta_repeaters_present;
return local_node;
}

6
drivers/firewire/fw-topology.h
View File

@ -19,12 +19,6 @@
#ifndef __fw_topology_h
#define __fw_topology_h
enum {
FW_TOPOLOGY_A = 0x01,
FW_TOPOLOGY_B = 0x02,
FW_TOPOLOGY_MIXED = 0x03,
};
enum {
FW_NODE_CREATED = 0x00,
FW_NODE_UPDATED = 0x01,

2
drivers/firewire/fw-transaction.h
View File

@ -245,7 +245,7 @@ struct fw_card {
struct fw_node *irm_node;
int color;
int gap_count;
int topology_type;
bool beta_repeaters_present;
int index;