blob: 64510cc644ce88e2b7ee023be0f3da21e964ddb5 [file] [log] [blame]
/* 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);
}