From 7bddd30e948e6c3856336e77221fdbe5ba749453 Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Sat, 11 Jun 2016 18:39:35 +0200 Subject: nb/intel/sandybridge/raminit: Allow 933Mhz on Lenovo devices Set max_mem_clock_mhz in devicetree to 933Mhz. Allows to run the memory at up to DDR3-1866. The same frequency was allowed within the first vendor bios, but Lenovo than decided to limit it to DDR3-1333. Tested on Lenovo T520 and DDR3-1600 DIMM (RMT3170eb86e9w16). The RAM is now running at DDR3-1600 instead of DDR3-1333. This gives about 4% performance increase in glmark2 using the Intel GPU. Change-Id: If15be497402d84a2778f0434b6381a64eda832d6 Signed-off-by: Patrick Rudolph Reviewed-on: https://review.coreboot.org/15158 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Martin Roth --- src/northbridge/intel/sandybridge/raminit.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'src/northbridge') diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c index 4563547c79..15590d1da5 100644 --- a/src/northbridge/intel/sandybridge/raminit.c +++ b/src/northbridge/intel/sandybridge/raminit.c @@ -4374,7 +4374,11 @@ static unsigned int get_mem_min_tck(void) } return DEFAULT_TCK; } else { - if (cfg->max_mem_clock_mhz >= 800) + if (cfg->max_mem_clock_mhz >= 1066) + return TCK_1066MHZ; + else if (cfg->max_mem_clock_mhz >= 933) + return TCK_933MHZ; + else if (cfg->max_mem_clock_mhz >= 800) return TCK_800MHZ; else if (cfg->max_mem_clock_mhz >= 666) return TCK_666MHZ; -- cgit v1.2.3