| Message ID | 20200917101856.3156869-11-badhri@google.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v7,01/11] usb: typec: tcpci: Add a getter method to retrieve tcpm_port reference | expand |
On Fri, Sep 18, 2020 at 7:20 AM Heikki Krogerus <heikki.krogerus@linux.intel.com> wrote: > > On Thu, Sep 17, 2020 at 03:18:56AM -0700, Badhri Jagan Sridharan wrote: > > Programs VBUS_SINK_DISCONNECT_THRESHOLD based on the power_role, > > voltage requested as sink, mode of operation. > > > > The programmed threshold is based on vSinkDisconnect and > > vSinkDisconnectPD values. > > > > Signed-off-by: Badhri Jagan Sridharan <badhri@google.com> > > --- > > Changes since v1: > > - Changing patch version to v6 to fix version number confusion. > > > > Changes since v6: > > - Rebase on usb-next. > > --- > > drivers/usb/typec/tcpm/tcpci_maxim.c | 48 ++++++++++++++++++++++++++++ > > 1 file changed, 48 insertions(+) > > > > diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c > > index 723d7dd38f75..8289b596d2ee 100644 > > --- a/drivers/usb/typec/tcpm/tcpci_maxim.c > > +++ b/drivers/usb/typec/tcpm/tcpci_maxim.c > > @@ -137,6 +137,52 @@ static void max_tcpci_init_regs(struct max_tcpci_chip *chip) > > return; > > } > > > > +static int max_tcpci_set_auto_vbus_discharge_threshold(struct tcpci *tcpci, struct tcpci_data *data, > > + enum typec_role port_role, > > + enum typec_pwr_opmode mode, bool pps_active, > > + u32 requested_vbus_voltage_mv) > > +{ > > + struct max_tcpci_chip *chip = tdata_to_max_tcpci(data); > > + u32 threshold = 0; > > + u8 pwr_ctrl; > > + > > + /* > > + * Indicates that vbus is going to go away due PR_SWAP, hard reset etc. > > + * Do not discharge vbus here. > > + */ > > + if (requested_vbus_voltage_mv == 0) > > + goto write_thresh; > > I would assume that step is the same for every TCPC, no? I agree so moved to tcpci.c code. > > > + if (port_role == TYPEC_SINK) { > > + max_tcpci_read8(chip, TCPC_POWER_CTRL, &pwr_ctrl); > > + if (pwr_ctrl & TCPC_FAST_ROLE_SWAP_EN) { > > + /* To prevent disconnect when the source is fast role swap is capable. */ > > + threshold = 3500; > > + } else if (mode == TYPEC_PWR_MODE_PD) { > > + if (pps_active) > > + threshold = (95 * requested_vbus_voltage_mv / 100) - 850; > > + else > > + threshold = (95 * requested_vbus_voltage_mv / 100) - 1250; > > + } else { > > + /* 3.5V for non-pd sink */ > > + threshold = 3500; > > + } > > + } else { > > + /* 4V for source */ > > + threshold = 4000; > > + } > > + > > + threshold = threshold / TCPC_VBUS_SINK_DISCONNECT_THRESH_LSB; > > + > > + if (threshold > TCPC_VBUS_SINK_DISCONNECT_THRESH_MAX) { > > + dev_err(chip->dev, "VBUS_SINK_DISCONNECT_THRESH out of range"); > > + return -EINVAL; > > + } > > + > > +write_thresh: > > + return max_tcpci_write16(chip, TCPC_VBUS_SINK_DISCONNECT_THRESH, threshold); > > So couldn't tcpci.c write that register? This callback would then just > calculate the value. I just want to avoid boilerplate. Done ! > > The threshold has type u32, but you still pass it to > max_tcpci_write16(). Is that on purpose (doesn't the compiler > complain)? I didnt see any warnings ! I don't know why. It wouldn't overflow though as TCPC_VBUS_SINK_DISCONNECT_THRESH_MAX has a max value of 0x3ff. Have corrected it though and moved the code to tcpci.c in v8. Thanks, Badhri > > thanks, > > -- > heikki
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c index 723d7dd38f75..8289b596d2ee 100644 --- a/drivers/usb/typec/tcpm/tcpci_maxim.c +++ b/drivers/usb/typec/tcpm/tcpci_maxim.c @@ -137,6 +137,52 @@ static void max_tcpci_init_regs(struct max_tcpci_chip *chip) return; } +static int max_tcpci_set_auto_vbus_discharge_threshold(struct tcpci *tcpci, struct tcpci_data *data, + enum typec_role port_role, + enum typec_pwr_opmode mode, bool pps_active, + u32 requested_vbus_voltage_mv) +{ + struct max_tcpci_chip *chip = tdata_to_max_tcpci(data); + u32 threshold = 0; + u8 pwr_ctrl; + + /* + * Indicates that vbus is going to go away due PR_SWAP, hard reset etc. + * Do not discharge vbus here. + */ + if (requested_vbus_voltage_mv == 0) + goto write_thresh; + + if (port_role == TYPEC_SINK) { + max_tcpci_read8(chip, TCPC_POWER_CTRL, &pwr_ctrl); + if (pwr_ctrl & TCPC_FAST_ROLE_SWAP_EN) { + /* To prevent disconnect when the source is fast role swap is capable. */ + threshold = 3500; + } else if (mode == TYPEC_PWR_MODE_PD) { + if (pps_active) + threshold = (95 * requested_vbus_voltage_mv / 100) - 850; + else + threshold = (95 * requested_vbus_voltage_mv / 100) - 1250; + } else { + /* 3.5V for non-pd sink */ + threshold = 3500; + } + } else { + /* 4V for source */ + threshold = 4000; + } + + threshold = threshold / TCPC_VBUS_SINK_DISCONNECT_THRESH_LSB; + + if (threshold > TCPC_VBUS_SINK_DISCONNECT_THRESH_MAX) { + dev_err(chip->dev, "VBUS_SINK_DISCONNECT_THRESH out of range"); + return -EINVAL; + } + +write_thresh: + return max_tcpci_write16(chip, TCPC_VBUS_SINK_DISCONNECT_THRESH, threshold); +} + static void process_rx(struct max_tcpci_chip *chip, u16 status) { struct pd_message msg; @@ -441,6 +487,8 @@ static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id chip->data.start_drp_toggling = max_tcpci_start_toggling; chip->data.TX_BUF_BYTE_x_hidden = true; chip->data.init = tcpci_init; + chip->data.set_auto_vbus_discharge_threshold = max_tcpci_set_auto_vbus_discharge_threshold; + chip->data.auto_discharge_disconnect = true; max_tcpci_init_regs(chip); chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
Programs VBUS_SINK_DISCONNECT_THRESHOLD based on the power_role, voltage requested as sink, mode of operation. The programmed threshold is based on vSinkDisconnect and vSinkDisconnectPD values. Signed-off-by: Badhri Jagan Sridharan <badhri@google.com> --- Changes since v1: - Changing patch version to v6 to fix version number confusion. Changes since v6: - Rebase on usb-next. --- drivers/usb/typec/tcpm/tcpci_maxim.c | 48 ++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)