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>
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 9eb1eda..0aeab32 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -336,8 +336,11 @@
}
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
diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c
index 4e35850..77e3f82 100644
--- a/drivers/firewire/fw-topology.c
+++ b/drivers/firewire/fw-topology.c
@@ -172,7 +172,8 @@
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 @@
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 @@
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 @@
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 @@
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;
}
diff --git a/drivers/firewire/fw-topology.h b/drivers/firewire/fw-topology.h
index 363b6cb..aced9f7 100644
--- a/drivers/firewire/fw-topology.h
+++ b/drivers/firewire/fw-topology.h
@@ -20,12 +20,6 @@
#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,
FW_NODE_DESTROYED = 0x02,
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index f54eee4..5abed19 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -245,7 +245,7 @@
struct fw_node *irm_node;
int color;
int gap_count;
- int topology_type;
+ bool beta_repeaters_present;
int index;