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IB/qib: Set default LE2 value for active cables to 0

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For active and far-EQ cables use an LE2 value of 0 for improved SI.

Signed-off-by: Mitko Haralanov <mitko@qlogic.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Mitko Haralanov 2011-02-28 13:39:49 +00:00 committed by Roland Dreier
parent cc7fb05946
commit 4634b7945c
2 changed files with 12 additions and 3 deletions
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13
drivers/infiniband/hw/qib/qib_iba7322.c
View file

@ -5582,9 +5582,16 @@ static void qsfp_7322_event(struct work_struct *work)
* even on failure to read cable information. We don't
* get here for QME, so IS_QME check not needed here.
*/
le2 = (!ret && qd->cache.atten[1] >= qib_long_atten &&
!ppd->dd->cspec->r1 && QSFP_IS_CU(qd->cache.tech)) ?
LE2_5m : LE2_DEFAULT;
if (!ret && !ppd->dd->cspec->r1) {
if (QSFP_IS_ACTIVE_FAR(qd->cache.tech))
le2 = LE2_QME;
else if (qd->cache.atten[1] >= qib_long_atten &&
QSFP_IS_CU(qd->cache.tech))
le2 = LE2_5m;
else
le2 = LE2_DEFAULT;
} else
le2 = LE2_DEFAULT;
ibsd_wr_allchans(ppd, 13, (le2 << 7), BMASK(9, 7));
init_txdds_table(ppd, 0);
}

2
drivers/infiniband/hw/qib/qib_qsfp.h
View file

@ -79,6 +79,8 @@
extern const char *const qib_qsfp_devtech[16];
/* Active Equalization includes fiber, copper full EQ, and copper near Eq */
#define QSFP_IS_ACTIVE(tech) ((0xA2FF >> ((tech) >> 4)) & 1)
/* Active Equalization includes fiber, copper full EQ, and copper far Eq */
#define QSFP_IS_ACTIVE_FAR(tech) ((0x32FF >> ((tech) >> 4)) & 1)
/* Attenuation should be valid for copper other than full/near Eq */
#define QSFP_HAS_ATTEN(tech) ((0x4D00 >> ((tech) >> 4)) & 1)
/* Length is only valid if technology is "copper" */