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authorRavi Sarawadi <ravishankar.sarawadi@intel.com>2020-10-14 16:30:38 -0700
committerTim Wawrzynczak <twawrzynczak@chromium.org>2020-11-05 22:58:27 +0000
commitd83e24d9d562bf9697a3fb8b02736e09d5cdafb0 (patch)
treec516e3f71d4e52d9ea59af55a61ea513a543882e /Documentation/releases/coreboot-4.4-relnotes.md
parent1032d22152f1889246cda62e767af1da24407089 (diff)
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>
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