3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mike Marciniszyn <mike.marcinis...@intel.com>
commit 2f75e12c4457a9b3d042c0a0d748fa198dc2ffaf upstream.
Research has shown that commit a77fcf895046 ("IB/qib: Use a single
txselect module parameter for serdes tuning") missed a key serdes init
sequence.
This patch add that sequence.
Reviewed-by: Dennis Dalessandro <dennis.dalessan...@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marcinis...@intel.com>
Signed-off-by: Roland Dreier <rol...@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/infiniband/hw/qib/qib_iba7322.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -2279,6 +2279,11 @@ static int qib_7322_bringup_serdes(struc
qib_write_kreg_port(ppd, krp_ibcctrl_a, ppd->cpspec->ibcctrl_a);
qib_write_kreg(dd, kr_scratch, 0ULL);
+ /* ensure previous Tx parameters are not still forced */
+ qib_write_kreg_port(ppd, krp_tx_deemph_override,
+ SYM_MASK(IBSD_TX_DEEMPHASIS_OVERRIDE_0,
+ reset_tx_deemphasis_override));
+
if (qib_compat_ddr_negotiate) {
ppd->cpspec->ibdeltainprog = 1;
ppd->cpspec->ibsymsnap = read_7322_creg32_port(ppd,
--
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