diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mainboard/google/hatch/variants/puff/mainboard.c | 55 |
1 files changed, 37 insertions, 18 deletions
diff --git a/src/mainboard/google/hatch/variants/puff/mainboard.c b/src/mainboard/google/hatch/variants/puff/mainboard.c index 3f74c968b1..ceeb0c5aba 100644 --- a/src/mainboard/google/hatch/variants/puff/mainboard.c +++ b/src/mainboard/google/hatch/variants/puff/mainboard.c @@ -31,23 +31,6 @@ static void wait_for_hpd(gpio_t gpio, long timeout) stopwatch_duration_msecs(&sw)); } -void variant_ramstage_init(void) -{ - static const long display_timeout_ms = 3000; - - /* This is reconfigured back to whatever FSP-S expects by - gpio_configure_pads. */ - gpio_input(GPIO_HDMI_HPD); - gpio_input(GPIO_DP_HPD); - if (display_init_required() - && !gpio_get(GPIO_HDMI_HPD) - && !gpio_get(GPIO_DP_HPD)) { - /* This has to be done before FSP-S runs. */ - if (google_chromeec_wait_for_displayport(display_timeout_ms)) - wait_for_hpd(GPIO_DP_HPD, display_timeout_ms); - } -} - /* * For type-C chargers, set PL2 to 90% of max power to account for * cable loss and FET Rdson loss in the path from the source. @@ -86,6 +69,24 @@ void variant_ramstage_init(void) * | n (U22) | 29 | .9n | .9n | x(43) | * +-------------+-----+---------+---------+-------+ */ + +/* + * Psys_pmax considerations + * + * Given the hardware design in puff, the serial shunt resistor is 0.01ohm. + * The full scale of hardware PSYS signal 0.8v maps to system current 9.6A + * instead of real system power. The equation is shown below: + * PSYS = 0.8v = (0.01ohm x Iinput) x 50 (INA213, gain 50V/V) x 15k/(15k + 75k) + * Hence, Iinput (Amps) = 9.6A + * 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 sholud be 15v x 9.6A = 144W + * For Type-C 20V, the Psys_pmax should be 20v x 9.6A = 192W + * For a barral jack, the Psys_pmax should be 19v x 9.6A = 182.4W + */ +#define PSYS_IMAX 9600 +#define BJ_VOLTS_MV 19000 + static void mainboard_set_power_limits(config_t *conf) { enum usb_chg_type type; @@ -108,15 +109,33 @@ static void mainboard_set_power_limits(config_t *conf) /* set minimum duty cycle */ conf->tdp_psyspl3_dutycycle = PUFF_MIN_DUTYCYCLE; conf->tdp_pl4 = SET_PSYSPL2(psyspl2); + } else { + /* Input type is barrel jack */ + volts_mv = BJ_VOLTS_MV; } + /* voltage unit is milliVolts and current is in milliAmps */ + conf->psys_pmax = (u16)(((u32)PSYS_IMAX * volts_mv) / 1000000); conf->tdp_pl2_override = PUFF_PL2; /* set psyspl2 to 90% of max adapter power */ conf->tdp_psyspl2 = SET_PSYSPL2(psyspl2); } -void variant_mainboard_enable(struct device *dev) +void variant_ramstage_init(void) { + static const long display_timeout_ms = 3000; config_t *conf = config_of_soc(); + + /* This is reconfigured back to whatever FSP-S expects by gpio_configure_pads. */ + gpio_input(GPIO_HDMI_HPD); + gpio_input(GPIO_DP_HPD); + if (display_init_required() + && !gpio_get(GPIO_HDMI_HPD) + && !gpio_get(GPIO_DP_HPD)) { + /* This has to be done before FSP-S runs. */ + if (google_chromeec_wait_for_displayport(display_timeout_ms)) + wait_for_hpd(GPIO_DP_HPD, display_timeout_ms); + } + /* Psys_pmax needs to be setup before FSP-S */ mainboard_set_power_limits(conf); } |