diff options
| author | Angel Pons <th3fanbus@gmail.com> | 2020-03-22 13:15:12 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-03-26 10:20:35 +0000 |
| commit | ca2f68abedcc2065574a03a4525b1c3cab7280ba (patch) | |
| tree | d471c91bb08df1a5ecfc624855f61e4b0f258679 /src | |
| parent | 5fd50b6b198d7e086945ca0255ccc0757b31f748 (diff) | |
nb/intel/sandybridge: Correct TC_DTP handling
It is only for Ivy Bridge, and needs to be set on certain circumstances.
Change-Id: I4093adef44fae787c96fec4b4b8c7c867786d219
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39760
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/northbridge/intel/sandybridge/raminit_common.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c index 620c57404a..9e27400942 100644 --- a/src/northbridge/intel/sandybridge/raminit_common.c +++ b/src/northbridge/intel/sandybridge/raminit_common.c @@ -216,8 +216,22 @@ void dram_timing_regs(ramctr_timing *ctrl) printram("OTHP [%x] = %x\n", addr, reg); MCHBAR32(addr) = reg; - /* FIXME: This register only exists on Ivy Bridge! */ - MCHBAR32(TC_DTP_ch(channel)) = 0; + /* Debug parameters - only applies to Ivy Bridge */ + if (IS_IVY_CPU(ctrl->cpu)) { + reg = 0; + + /* + * If tXP and tXPDLL are very high, we need to increase them by one. + * This can only happen on Ivy Bridge, and when overclocking the RAM. + */ + if (ctrl->tXP >= 8) + reg |= (1 << 12); + + if (ctrl->tXPDLL >= 32) + reg |= (1 << 13); + + MCHBAR32(TC_DTP_ch(channel)) = reg; + } MCHBAR32_OR(addr, 0x00020000); |