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intel/skylake: Support for setting AC/DC loadline

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Add options to set the AC and DC loadline values for each supported
VR type so these can be tuned on a per-board basis in devicetree.cb.

BUG=b:36228330
BRANCH=none
TEST=Build and boot on Eve and check debug FSP output to ensure that
it is applying the provided loadline values

Change-Id: I2a5533d2c9fd86351c86584e3738e80ac4c1f915
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/18819
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Duncan Laurie 2017-03-14 16:40:06 -07:00
parent 4fa8a6f4fe
commit 86db469871
2 changed files with 9 additions and 0 deletions
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4
src/soc/intel/skylake/include/soc/vr_config.h
View file

@ -61,6 +61,10 @@ struct vr_config {
/* VR Voltage Limit. Range is 0-7999mV */
int voltage_limit;
/* AC and DC Loadline in 1/100 mOhms. Range is 0-6249 */
int ac_loadline;
int dc_loadline;
};
#define VR_CFG_AMP(i) ((i) * 4)

5
src/soc/intel/skylake/vr_config.c
View file

@ -109,4 +109,9 @@ void fill_vr_domain_config(void *params,
vr_params->ImonOffset[domain] = cfg->imon_offset;
vr_params->IccMax[domain] = cfg->icc_max;
vr_params->VrVoltageLimit[domain] = cfg->voltage_limit;
#if IS_ENABLED(CONFIG_PLATFORM_USES_FSP2_0)
vr_params->AcLoadline[domain] = cfg->ac_loadline;
vr_params->DcLoadline[domain] = cfg->dc_loadline;
#endif
}