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IB/hfi1: Use static CTLE with Preset 6 for integrated HFIs

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[ Upstream commit 39e2afa8d042a53d855137d4c5a689a6f5492b39 ]

After extended testing, it was found that the previous PCIe Gen
3 recipe, which used adaptive CTLE with Preset 4, could cause an
NMI/Surprise Link Down in about 1 in 100 to 1 in 1000 power cycles on
some platforms. New EV data combined with extensive empirical data
indicates that the new recipe should use static CTLE with Preset 6 for
all integrated silicon SKUs.

Fixes: c3f8de0b334c ("IB/hfi1: Add static PCIe Gen3 CTLE tuning")
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Easwar Hariharan 2017-02-08 05:26:14 -08:00 committed by Greg Kroah-Hartman
parent 939f4f6ec7
commit 06f2d879c3
1 changed files with 2 additions and 2 deletions
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4
drivers/infiniband/hw/hfi1/pcie.c
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@ -673,12 +673,12 @@ MODULE_PARM_DESC(pcie_retry, "Driver will try this many times to reach requested
#define UNSET_PSET 255
#define DEFAULT_DISCRETE_PSET 2 /* discrete HFI */
#define DEFAULT_MCP_PSET 4 /* MCP HFI */
#define DEFAULT_MCP_PSET 6 /* MCP HFI */
static uint pcie_pset = UNSET_PSET;
module_param(pcie_pset, uint, S_IRUGO);
MODULE_PARM_DESC(pcie_pset, "PCIe Eq Pset value to use, range is 0-10");
static uint pcie_ctle = 1; /* discrete on, integrated off */
static uint pcie_ctle = 3; /* discrete on, integrated on */
module_param(pcie_ctle, uint, S_IRUGO);
MODULE_PARM_DESC(pcie_ctle, "PCIe static CTLE mode, bit 0 - discrete on/off, bit 1 - integrated on/off");