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authorTimothy Pearson <tpearson@raptorengineering.com>2018-04-24 21:13:30 -0500
committerRaptor Engineering Development Team <support@raptorengineering.com>2019-04-21 08:20:38 +0000
commit48fd8c4fef309b6ddb3c96c8d128558203d901ca (patch)
treedfbb626bdfd7f51178d0eecbc6e9230ebbba2e2e
parent1e1ea69fbf6036d9937071c8ecb70830bd45b188 (diff)
downloadtalos-hostboot-48fd8c4fef309b6ddb3c96c8d128558203d901ca.zip
talos-hostboot-48fd8c4fef309b6ddb3c96c8d128558203d901ca.tar.gz
Cap voltage offset when biased
This fixes spurious (invalid) voltage requests when the bias frequency exceeds the maximum WoF frequency Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
-rw-r--r--src/import/chips/p9/procedures/hwp/pm/p9_pstate_parameter_block.C8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/import/chips/p9/procedures/hwp/pm/p9_pstate_parameter_block.C b/src/import/chips/p9/procedures/hwp/pm/p9_pstate_parameter_block.C
index 87f78de..cedb6d1 100644
--- a/src/import/chips/p9/procedures/hwp/pm/p9_pstate_parameter_block.C
+++ b/src/import/chips/p9/procedures/hwp/pm/p9_pstate_parameter_block.C
@@ -1748,11 +1748,15 @@ uint32_t PlatPmPPB::ps2v_mv(const Pstate i_pstate)
FAPI_INF ("l_SlopeValue %x",l_SlopeValue);
- uint32_t x = (l_SlopeValue * (-i_pstate + iv_operating_points[VPD_PT_SET_BIASED_SYSP][region_start].pstate));
+ int32_t x_candidate = (l_SlopeValue * (-i_pstate + iv_operating_points[VPD_PT_SET_BIASED_SYSP][region_start].pstate));
+ uint32_t x = 0;
uint32_t y = x >> VID_SLOPE_FP_SHIFT_12;
+ if (x_candidate > 0)
+ x = x_candidate;
+
uint32_t l_vdd =
- (((l_SlopeValue * (-i_pstate + iv_operating_points[VPD_PT_SET_BIASED_SYSP][region_start].pstate)) >> VID_SLOPE_FP_SHIFT_12)
+ ((x >> VID_SLOPE_FP_SHIFT_12)
+ (iv_operating_points[VPD_PT_SET_BIASED_SYSP][region_start].vdd_mv));
// Round up
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