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coreboot/src/soc/intel
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Ravi Sarawadi d83e24d9d5 soc/intel/tigerlake: Disable C1 C-state Demotion 
Disable C1 C-state auto demotion to decrease SoC power usage.

When set, processor will conditionally demote C3/C6/C7 requests
to C1 based on uncore auto-demote information.

BUG=b:161215906
TEST=Measure and confirm SoC power usage reduction for key use cases
 eg 'Google Meets video call'

Measured on instrumented boards for Volteer EVT and Delbin.

Below measurements for Volteer:

Google meets with 720p 	w/ auto-demotion   w/o auto-demotion
System Power 	        13.14W	              9.4W
SOC Power 	         7.9W	              5.4W

Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Signed-off-by: Shweta Malik <shweta.malik@intel.com>
Change-Id: I649cafbaf03917d76521aa5f76ec58d218e1a1b1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46438
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
2020-11-05 22:58:27 +00:00
..
alderlake soc/intel: Select SOC_INTEL_COMMON_BLOCK_CAR as per alphabetical order 2020-11-03 04:07:02 +00:00
apollolake soc/intel: Use of common reset code block 2020-11-02 10:43:53 +00:00
baytrail src: Include <arch/io.h> when appropriate 2020-10-26 06:44:40 +00:00
braswell src: Include <arch/io.h> when appropriate 2020-10-26 06:44:40 +00:00
broadwell soc/intel/broadwell: Merge device_nvs.asl into globalnvs.asl 2020-11-04 23:21:29 +00:00
cannonlake soc/intel: Use of common reset code block 2020-11-02 10:43:53 +00:00
common soc/intel/common/block/systemagent/memmap.c: Align cached region 2020-11-03 17:04:03 +00:00
denverton_ns soc/intel/denverton_ns: Add PCH_DEVFN_PMC for finding PMC device 2020-11-02 06:28:50 +00:00
elkhartlake soc/intel: Select SOC_INTEL_COMMON_BLOCK_CAR as per alphabetical order 2020-11-03 04:07:02 +00:00
icelake soc/intel: Select SOC_INTEL_COMMON_BLOCK_CAR as per alphabetical order 2020-11-03 04:07:02 +00:00
jasperlake soc/intel/{tgl,jsl}: Enable logging of wake sources for S0ix 2020-11-03 23:58:45 +00:00
quark arch/x86: Introduce ARCH_ALL_STAGES_X86_32 2020-09-26 11:42:28 +00:00
skylake soc/intel/skl,acpi/acpigen: convert global CPPC package to local one 2020-11-04 09:40:21 +00:00
tigerlake soc/intel/tigerlake: Disable C1 C-state Demotion 2020-11-05 22:58:27 +00:00
xeon_sp soc/intel/xeon_sp: Use common cpu/intel romstage entry 2020-11-05 00:02:07 +00:00
Kconfig fsp2_0: Gather Kconfig declarations 2020-04-05 23:26:24 +00:00