diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2015-01-20 07:53:27 -0800 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2015-04-10 20:17:53 +0200 |
| commit | ff0f460e764e24d4f7bae7e9dce8967f9cd3e36c (patch) | |
| tree | b46032b2780d0b1e7588e7bdba031ad58f55e82d /src/soc/intel/broadwell/chip.h | |
| parent | ba081ef50dd6cd62de1165e8315aca9b3a40c337 (diff) | |
broadwell: Add configuration for tuning VR for C-state operations
Add some configuration options that allow tuning the VR for C-state
settings that may be able to reduce noise.
- Add option to enable slow VR ramp rate for C-state exit
- Add variable to configure the minimum C6/C7 voltage
BUG=chrome-os-partner:34771
BRANCH=broadwell
TEST=build and boot on samus
Change-Id: I01445d62fbfcf200b787b924d8d72685819a4715
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: ed8f355e60292c82791817ae31bff58ac2390a72
Original-Change-Id: I8af75b69c8b55d3e210170ee96f8e22c2fd76374
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/241950
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9497
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/soc/intel/broadwell/chip.h')
| -rw-r--r-- | src/soc/intel/broadwell/chip.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/chip.h b/src/soc/intel/broadwell/chip.h index 703c865a8f..77c517d5ec 100644 --- a/src/soc/intel/broadwell/chip.h +++ b/src/soc/intel/broadwell/chip.h @@ -130,6 +130,28 @@ struct soc_intel_broadwell_config { /* Enable S0iX support */ int s0ix_enable; + /* + * Minimum voltage for C6/C7 state: + * 0x67 = 1.6V (full swing) + * ... + * 0x79 = 1.7V + * ... + * 0x83 = 1.8V (no swing) + */ + int vr_cpu_min_vid; + + /* + * Set slow VR ramp rate on C-state exit: + * 0 = Fast VR ramp rate / 2 + * 1 = Fast VR ramp rate / 4 + * 2 = Fast VR ramp rate / 8 + * 3 = Fast VR ramp rate / 16 + */ + int vr_slow_ramp_rate_set; + + /* Enable slow VR ramp rate */ + int vr_slow_ramp_rate_enable; + /* Deep SX enable */ int deep_sx_enable_ac; int deep_sx_enable_dc; |