From f36ed21c573d62583ca2a86eed594acd149e0c4c Mon Sep 17 00:00:00 2001 From: Vaibhav Shankar Date: Mon, 16 Oct 2017 10:16:27 -0700 Subject: mainboard/intel/cannonlake_rvp: Enable hardware P state control This patch provides configuration parameter to enable/disable Intel Speed Shift Technology. Change-Id: I95a240e8be6e19ac0e14698ab33543c491a8c974 Signed-off-by: Vaibhav Shankar Reviewed-on: https://review.coreboot.org/22049 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Paul Menzel --- src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb | 3 +++ src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb | 3 +++ 2 files changed, 6 insertions(+) diff --git a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb index b80cd82d50..c3223b1913 100644 --- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb +++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb @@ -67,6 +67,9 @@ chip soc/intel/cannonlake register "PcieClkSrcClkReq[4]" = "4" register "PcieClkSrcClkReq[5]" = "5" + # Enable "Intel Speed Shift Technology" + register "speed_shift_enable" = "1" + device domain 0 on device pci 00.0 on end # Host Bridge device pci 02.0 on end # Integrated Graphics Device diff --git a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb index 9a0ab64672..4bada02fc8 100644 --- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb +++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb @@ -65,6 +65,9 @@ chip soc/intel/cannonlake register "PcieClkSrcClkReq[4]" = "4" register "PcieClkSrcClkReq[5]" = "5" + # Enable "Intel Speed Shift Technology" + register "speed_shift_enable" = "1" + device domain 0 on device pci 00.0 on end # Host Bridge device pci 02.0 on end # Integrated Graphics Device -- cgit v1.2.3