diff options
| author | Dan Elkouby <streetwalkermc@gmail.com> | 2018-04-13 18:47:10 +0300 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-04-16 08:46:30 +0000 |
| commit | dabebc3716bac1dbe9445dfb2bbbbb833ee21de1 (patch) | |
| tree | 5cc39ad5a948381b6f76a664332bde6077112ebc /src/northbridge/intel/sandybridge/raminit_ivy.c | |
| parent | 0c024208cdd3cfdfd7689b6fcba1b5c877f550c7 (diff) | |
nb/intel/sandybridge: support more XMP timings
Tested with a pair of GSkill F3-1866C9-8GSR.
This makes sure in particular that we honor the CMD rate requested by
the XMP profile. This memory kit needs a CMD rate of 2 to be stable at
DDR3-1600 and up, even though it passes training at 1.
Also respect requested CWL to match vendor firmware and for a potential
increase in performance. The tested kit requests a tighter value than
the per-frequency table provides and has shown to be stable using that
setting.
Change-Id: I634bed764d76345c27f02a2fae5abb2d81b38fd9
Signed-off-by: Dan Elkouby <streetwalkermc@gmail.com>
Reviewed-on: https://review.coreboot.org/25664
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/northbridge/intel/sandybridge/raminit_ivy.c')
| -rw-r--r-- | src/northbridge/intel/sandybridge/raminit_ivy.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit_ivy.c b/src/northbridge/intel/sandybridge/raminit_ivy.c index 675ac7181c..19dea2f2e1 100644 --- a/src/northbridge/intel/sandybridge/raminit_ivy.c +++ b/src/northbridge/intel/sandybridge/raminit_ivy.c @@ -479,7 +479,10 @@ static void dram_timing(ramctr_timing *ctrl) /* DLL_CONFIG_MDLL_W_TIMER */ ctrl->reg_5064b0 = (128000 / ctrl->tCK) + 3; - ctrl->CWL = get_CWL(ctrl->tCK); + if (ctrl->tCWL) + ctrl->CWL = DIV_ROUND_UP(ctrl->tCWL, ctrl->tCK); + else + ctrl->CWL = get_CWL(ctrl->tCK); printk(BIOS_DEBUG, "Selected CWL latency : %uT\n", ctrl->CWL); /* Find tRCD */ |