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firewire: fw-sbp2: Use sbp2 device-provided mgt orb timeout for logins

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To be more compliant with section 7.4.8 of the SBP-2 specification,
use the mgt_ORB_timeout specified in the SBP-2 device's config rom
for login ORB attempts (though with some sanity checks). A happy
side-effect is that certain device and controller combinations that
sometimes take more than 20 seconds to get synced up (like my laptop
with just about any SBP-2 device) now function more reliably.

Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (silenced sparse)
This commit is contained in:
Jarod Wilson 2008-01-25 23:31:12 -05:00 committed by Stefan Richter
parent a4c379c197
commit 384170da93
1 changed files with 24 additions and 5 deletions
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29
drivers/firewire/fw-sbp2.c
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@ -149,15 +149,17 @@ struct sbp2_target {
unsigned workarounds;
struct list_head lu_list;
unsigned int mgt_orb_timeout;
};
/*
* Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
* provided in the config rom. A high timeout value really only matters
* on initial login, where we'll just use 20s rather than hassling with
* reading the config rom, since it really wouldn't buy us much.
* provided in the config rom. Most devices do provide a value, which
* we'll use for login management orbs, but with some sane limits.
*/
#define SBP2_LOGIN_ORB_TIMEOUT 20000 /* Timeout in ms */
#define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
#define SBP2_ORB_TIMEOUT 2000 /* Timeout in ms */
#define SBP2_ORB_NULL 0x80000000
#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
@ -166,6 +168,7 @@ struct sbp2_target {
#define SBP2_DIRECTION_FROM_MEDIA 0x1
/* Unit directory keys */
#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
#define SBP2_CSR_FIRMWARE_REVISION 0x3c
#define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
#define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
@ -527,7 +530,7 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
orb->request.misc |=
MANAGEMENT_ORB_RECONNECT(2) |
MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login);
timeout = SBP2_LOGIN_ORB_TIMEOUT;
timeout = lu->tgt->mgt_orb_timeout;
} else {
timeout = SBP2_ORB_TIMEOUT;
}
@ -777,6 +780,7 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
{
struct fw_csr_iterator ci;
int key, value;
unsigned int timeout;
fw_csr_iterator_init(&ci, directory);
while (fw_csr_iterator_next(&ci, &key, &value)) {
@ -799,6 +803,21 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
*firmware_revision = value;
break;
case SBP2_CSR_UNIT_CHARACTERISTICS:
/* the timeout value is stored in 500ms units */
timeout = ((unsigned int) value >> 8 & 0xff) * 500;
timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT);
tgt->mgt_orb_timeout =
min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT);
if (timeout > tgt->mgt_orb_timeout)
fw_notify("%s: config rom contains %ds "
"management ORB timeout, limiting "
"to %ds\n", tgt->unit->device.bus_id,
timeout / 1000,
tgt->mgt_orb_timeout / 1000);
break;
case SBP2_CSR_LOGICAL_UNIT_NUMBER:
if (sbp2_add_logical_unit(tgt, value) < 0)
return -ENOMEM;