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mb/google/dedede/var/dibbi: Update power limits 

Add ramstage.c in Makefile.inc and update Dibbi power limits in
Dibbi ramstage.c.

BUG=b:281479111
TEST=emerge-dedede coreboot and check psys and PLx value on dibbi

Signed-off-by: Chia-Ling Hou <chia-ling.hou@intel.com>
Change-Id: Ieaff856b762b546f3e99acb7ba2ce15791193da6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75681
Reviewed-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Chia-Ling Hou 2023-06-07 17:20:34 +08:00 committed by Matt DeVillier
parent 84ecd89830
commit bf557e0d43
2 changed files with 36 additions and 0 deletions
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1
src/mainboard/google/dedede/variants/dibbi/Makefile.inc
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@ -1,3 +1,4 @@
## SPDX-License-Identifier: GPL-2.0-or-later ## SPDX-License-Identifier: GPL-2.0-or-later
ramstage-y += gpio.c ramstage-y += gpio.c
ramstage-y += ramstage.c

35
src/mainboard/google/dedede/variants/dibbi/ramstage.c Normal file
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@ -0,0 +1,35 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <baseboard/variants.h>
/*
* Psys_pmax considerations
*
* Given the hardware design in dibbi, the serial shunt resistor is 0.01ohm.
* The full scale of hardware PSYS signal 1.6v maps to system current 6.009A
* instead of real system power. The equation is shown below:
* PSYS = 1.6v ~= (0.01ohm x 6.009A) x 50 (INA213, gain 50V/V) x R631/(R631 + R638)
* R631/(R631 + R638) = 0.5325 = 36K / (36K + 31.6K)
*
* The Psys_pmax is a SW setting which tells IMVP9.1 the mapping between system input
* current and the actual system power. Since there is no voltage information
* from PSYS, different voltage input would map to different Psys_pmax settings:
* For Type-C 15V, the Psys_pmax should be 15v x 6.009A = 90.135W
* For Type-C 20V, the Psys_pmax should be 20v x 6.009A = 120.18W
* For a barrel jack, the Psys_pmax should be 19v x 6.009A = 114.171W
*
* Imagine that there is a type-c 100W (20V/5A) connected to DUT w/ full loading,
* and the Psys_pmax setting is 120W. Then IMVP9.1 can calculate the current system
* power = 120W * 5A / 6.009A = 100W, which is the actual system power.
*/
const struct psys_config psys_config = {
.efficiency = 97,
.psys_imax_ma = 6009,
.bj_volts_mv = 19000,
.bj_power_w = 65,
};
void variant_devtree_update(void)
{
variant_update_psys_power_limits(&psys_config);
}