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Commit 2f75e12c authored by Mike Marciniszyn's avatar Mike Marciniszyn Committed by Roland Dreier
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IB/qib: Add missing serdes init sequence 



Research has shown that commit a77fcf89 ("IB/qib: Use a single
txselect module parameter for serdes tuning") missed a key serdes init
sequence.

This patch add that sequence.

Cc: <stable@vger.kernel.org>
Reviewed-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent 38dbfb59

drivers/infiniband/hw/qib/qib_iba7322.c

+5 −0
Original line number Diff line number Diff line
@@ -2395,6 +2395,11 @@ static int qib_7322_bringup_serdes(struct qib_pportdata *ppd) 
	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,