Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/62655 )
Change subject: mb/google/brya: Set EPP to 45% for all Brya variants ......................................................................
mb/google/brya: Set EPP to 45% for all Brya variants
This sets EPP value to be 45% for all Brya variants.
Historically, EPP Ratio has always been 50% (128) on Chrome platforms. But on Intel Alderlake EPP ratio of 45% is recommended for optimal power and performance on Chrome platforms.
BUG=b:219785001 BRANCH=firmware-brya-14505.B TEST= Use 'iotools rdmsr [cpu id] 0x774' command and check field 32:24 = 0x73.
Signed-off-by: Cliff Huang cliff.huang@intel.corp-partner.google.com Change-Id: I973cfec72a0be24c56c4cd3283d2fe6e18400d02 Reviewed-on: https://review.coreboot.org/c/coreboot/+/62655 Tested-by: build bot (Jenkins) no-reply@coreboot.org Reviewed-by: Tim Wawrzynczak twawrzynczak@chromium.org --- M src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb 1 file changed, 4 insertions(+), 0 deletions(-)
Approvals: build bot (Jenkins): Verified Tim Wawrzynczak: Looks good to me, approved
diff --git a/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb b/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb index 0558307..d67fd4b 100644 --- a/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb +++ b/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb @@ -119,6 +119,10 @@ }, }"
+ # set EPP to 45%: 45 * 256/100 = 115 = 0x73 + register "enable_energy_perf_pref" = "true" + register "energy_perf_pref_value" = "0x73" + device domain 0 on device ref igpu on end device ref dtt on end
7 is the latest approved patch-set. No files were changed between the latest approved patch-set and the submitted one.