mb/google/volteer: Override power limits with SKU-specific limits
Using guidance from Intel, a new set of power limits (PL1, PL2 & PL4)
are available for TGL-U. They are dependent upon the SKU of the CPU
that the mainboard is running on. Volteer is updated here to use these
new limits.
To accomplish this, the SoC chip config's power_limits_config member
was expanded to an array, which can be indexed by POWER_LIMITS_*_CORE
macros. Just before power limits are applied, the correct set of them
is chosen from the array based on System Agent PCI ID. Therefore, a
TGL board should have two sets of power limits available in the
devicetree.
BUG=b:152639350
TEST=On a Volteer SKU4 (4-core), verified the following console output:
CPU PL1 = 15 Watts
CPU PL2 = 60 Watts
CPU PL4 = 105 Watts
Change-Id: I18a66fc3aacbb3ab594b2e3d6e2a4ad84c10d8f0
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42436
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Caveh Jalali <caveh@chromium.org>
diff --git a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
index 8cd926c..f2e427f 100644
--- a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
@@ -198,9 +198,15 @@
# Enable DPTF
register "dptf_enable" = "1"
- register "power_limits_config" = "{
+ register "power_limits_config[POWER_LIMITS_U_4_CORE]" = "{
.tdp_pl1_override = 15,
.tdp_pl2_override = 60,
+ .tdp_pl4 = 105,
+ }"
+ register "power_limits_config[POWER_LIMITS_U_2_CORE]" = "{
+ .tdp_pl1_override = 15,
+ .tdp_pl2_override = 38,
+ .tdp_pl4 = 71,
}"
register "Device4Enable" = "1"