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intel/skylake: Enable PROCHOT 

This patch would enable PROCHOT feature in skylake. Asserting
PROCHOT line would throttle the GPU/CPU.

BUG=chrome-os-partner:51142
BRANCH=glados
TEST=manually tested on lars. asserting PROCTHOT by EC
reduces FSP in fish-tank from approx 40 to 20. (50 fish setting),
also CPU freq. drops to from 1600000 to 400000

Change-Id: I8fc0c015ea2c26d20bbbfc619f720f231d540feb
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 1b88b1f183df9c7362d7e58acb0a1fa0b076d56e
Original-Change-Id: Ida8636efc3d8da56ebd3931144d31ab1b88fe806
Original-Signed-off-by: Pratik Prajapati <pratikkumar.v.prajapati@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/331690
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Original-(cherry picked from commit d091a999c3827179182b62a1274a9b3581f7f006)
Original-Reviewed-on: https://chromium-review.googlesource.com/333073
Original-Commit-Ready: Pratikkumar V Prajapati <pratikkumar.v.prajapati@intel.com>
Original-Tested-by: Pratikkumar V Prajapati <pratikkumar.v.prajapati@intel.com>
Original-Reviewed-by: Pratikkumar V Prajapati <pratikkumar.v.prajapati@intel.com>
Reviewed-on: https://review.coreboot.org/14120
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Pratik Prajapati 2016-03-08 12:34:06 -08:00 committed by Martin Roth
parent 89cc9ce399
commit 79cfcde458
1 changed files with 6 additions and 0 deletions
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6
src/soc/intel/skylake/cpu.c
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@ -252,6 +252,12 @@ static void configure_misc(void)
msr.lo = 1 << 4;
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 |= (1 << 23); /* Lock it */
wrmsr(MSR_POWER_CTL, msr);
}
static void enable_lapic_tpr(void)