diff options
Diffstat (limited to 'driver/tcpm/fusb302.c')
| -rw-r--r-- | driver/tcpm/fusb302.c | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/driver/tcpm/fusb302.c b/driver/tcpm/fusb302.c index 66c131fb37..bbb6015e56 100644 --- a/driver/tcpm/fusb302.c +++ b/driver/tcpm/fusb302.c @@ -434,7 +434,6 @@ static int fusb302_tcpm_init(int port) tcpm_set_polarity(port, 0); tcpm_set_vconn(port, 0); - /* Turn on the power! */ /* TODO: Reduce power consumption */ tcpc_write(port, TCPC_REG_POWER, TCPC_REG_POWER_PWR_ALL); @@ -1008,9 +1007,73 @@ void tcpm_set_bist_test_data(int port) } #ifdef CONFIG_USB_PD_TCPC_LOW_POWER +static int fusb302_set_toggle_mode(int port, int mode) +{ + int reg, rv; + + rv = i2c_read8(tcpc_config[port].i2c_info.port, + tcpc_config[port].i2c_info.addr_flags, + TCPC_REG_CONTROL2, ®); + if (rv) + return rv; + + reg &= ~TCPC_REG_CONTROL2_MODE_MASK; + reg |= mode << TCPC_REG_CONTROL2_MODE_POS; + return i2c_write8(tcpc_config[port].i2c_info.port, + tcpc_config[port].i2c_info.addr_flags, + TCPC_REG_CONTROL2, reg); +} + static int fusb302_tcpm_enter_low_power_mode(int port) { - return tcpc_write(port, TCPC_REG_POWER, TCPC_REG_POWER_PWR_LOW); + int reg, rv, mode = TCPC_REG_CONTROL2_MODE_DRP; + + /** + * vendor's suggested LPM flow: + * - enable low power mode and set up other things + * - sleep 250 us + * - start toggling + */ + rv = i2c_write8(tcpc_config[port].i2c_info.port, + tcpc_config[port].i2c_info.addr_flags, + TCPC_REG_POWER, TCPC_REG_POWER_PWR_LOW); + if (rv) + return rv; + + switch (pd_get_dual_role(port)) { + case PD_DRP_TOGGLE_ON: + mode = TCPC_REG_CONTROL2_MODE_DRP; + break; + case PD_DRP_TOGGLE_OFF: + mode = TCPC_REG_CONTROL2_MODE_UFP; + break; + case PD_DRP_FREEZE: + mode = pd_get_role(port) == PD_ROLE_SINK ? + TCPC_REG_CONTROL2_MODE_UFP : + TCPC_REG_CONTROL2_MODE_DFP; + break; + case PD_DRP_FORCE_SINK: + mode = TCPC_REG_CONTROL2_MODE_UFP; + break; + case PD_DRP_FORCE_SOURCE: + mode = TCPC_REG_CONTROL2_MODE_DFP; + break; + } + rv = fusb302_set_toggle_mode(port, mode); + if (rv) + return rv; + + usleep(250); + + rv = i2c_read8(tcpc_config[port].i2c_info.port, + tcpc_config[port].i2c_info.addr_flags, + TCPC_REG_CONTROL2, ®); + if (rv) + return rv; + reg |= TCPC_REG_CONTROL2_TOGGLE; + return i2c_write8(tcpc_config[port].i2c_info.port, + tcpc_config[port].i2c_info.addr_flags, + TCPC_REG_CONTROL2, reg); } #endif |