diff options
| author | Cole Nelson <colex.nelson@intel.com> | 2018-06-15 15:51:54 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-06-21 09:43:19 +0000 |
| commit | 63b6fea5c9585782a6a9d72fa4d10762a6692072 (patch) | |
| tree | d11a87bd24c56c199d23e336ebbf8a697f8a1842 /src/soc/intel/skylake | |
| parent | 4cdd2f8ce112bdad7f9db9d2feec171e45ca24f6 (diff) | |
soc/intel/{skl,kbl}: ensure C1E is disabled after S3 resume
C1E is disabled by the kernel driver intel_idle at boot. This does not
address the S3 resume case, so we lose state and C1E is enabled after S3
resume.
Disable C1E for SKL and KBL. This gives a coherent state before
and after S3 resume.
TEST='iotools rdmsr cpu 0x1fc'. Returns the same value after boot and S3
resume with bit [1] set to zero (0x20005d).
Change-Id: I1343f343bfac9b787f13c15b812c0a201dcccb38
Signed-off-by: Cole Nelson <colex.nelson@intel.com>
Reviewed-on: https://review.coreboot.org/27125
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/intel/skylake')
| -rw-r--r-- | src/soc/intel/skylake/cpu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c index d386d1f957..3a499ce1e7 100644 --- a/src/soc/intel/skylake/cpu.c +++ b/src/soc/intel/skylake/cpu.c @@ -310,9 +310,9 @@ static void configure_misc(void) msr.hi = 0; wrmsr(IA32_PACKAGE_THERM_INTERRUPT, msr); - /* Enable PROCHOT */ msr = rdmsr(MSR_POWER_CTL); msr.lo |= (1 << 0); /* Enable Bi-directional PROCHOT as an input*/ + msr.lo &= ~POWER_CTL_C1E_MASK; /* Disable C1E */ msr.lo |= (1 << 23); /* Lock it */ wrmsr(MSR_POWER_CTL, msr); } |