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usb: typec: tcpci_maxim: Add support for Sink FRS 

Upon receiving ALERT_EXTENDED.TCPC_SINK_FAST_ROLE_SWAP signal
tcpm to start Sink fast role swap signal.

Inform when TCPM is sourcing vbus.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201008061556.1402293-9-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Badhri Jagan Sridharan 2020-10-07 23:15:49 -07:00 committed by Greg Kroah-Hartman
parent 11121c2406
commit afb487a31d
1 changed files with 46 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/usb/typec/tcpm/tcpci_maxim.c
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@ -106,13 +106,22 @@ static void max_tcpci_init_regs(struct max_tcpci_chip *chip)
return;
}
ret = max_tcpci_write8(chip, TCPC_ALERT_EXTENDED, 0xff);
if (ret < 0) {
dev_err(chip->dev, "Unable to clear TCPC_ALERT_EXTENDED ret:%d\n", ret);
return;
}
alert_mask = TCPC_ALERT_TX_SUCCESS | TCPC_ALERT_TX_DISCARDED | TCPC_ALERT_TX_FAILED |
TCPC_ALERT_RX_HARD_RST | TCPC_ALERT_RX_STATUS | TCPC_ALERT_CC_STATUS |
TCPC_ALERT_VBUS_DISCNCT | TCPC_ALERT_RX_BUF_OVF | TCPC_ALERT_POWER_STATUS;
TCPC_ALERT_VBUS_DISCNCT | TCPC_ALERT_RX_BUF_OVF | TCPC_ALERT_POWER_STATUS |
/* Enable Extended alert for detecting Fast Role Swap Signal */
TCPC_ALERT_EXTND;
ret = max_tcpci_write16(chip, TCPC_ALERT_MASK, alert_mask);
if (ret < 0) {
dev_err(chip->dev, "Error writing to TCPC_ALERT_MASK ret:%d\n", ret);
dev_err(chip->dev,
"Error enabling TCPC_ALERT: TCPC_ALERT_MASK write failed ret:%d\n", ret);
return;
}
@ -122,6 +131,10 @@ static void max_tcpci_init_regs(struct max_tcpci_chip *chip)
dev_err(chip->dev, "Error writing to TCPC_POWER_CTRL ret:%d\n", ret);
return;
}
ret = max_tcpci_write8(chip, TCPC_ALERT_EXTENDED_MASK, TCPC_SINK_FAST_ROLE_SWAP);
if (ret < 0)
return;
}
static void process_rx(struct max_tcpci_chip *chip, u16 status)
@ -225,10 +238,23 @@ static void process_power_status(struct max_tcpci_chip *chip)
if (ret < 0)
return;
if (pwr_status == 0xff)
if (pwr_status == 0xff) {
max_tcpci_init_regs(chip);
else
} else if (pwr_status & TCPC_POWER_STATUS_SOURCING_VBUS) {
tcpm_sourcing_vbus(chip->port);
/*
* Alawys re-enable boost here.
* In normal case, when say an headset is attached, TCPM would
* have instructed to TCPC to enable boost, so the call is a
* no-op.
* But for Fast Role Swap case, Boost turns on autonomously without
* AP intervention, but, needs AP to enable source mode explicitly
* for AP to regain control.
*/
max_tcpci_set_vbus(chip->tcpci, &chip->data, true, false);
} else {
tcpm_vbus_change(chip->port);
}
}
static void process_tx(struct max_tcpci_chip *chip, u16 status)
@ -249,6 +275,7 @@ static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status)
{
u16 mask;
int ret;
u8 reg_status;
/*
* Clear alert status for everything except RX_STATUS, which shouldn't
@ -274,6 +301,21 @@ static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status)
}
}
if (status & TCPC_ALERT_EXTND) {
ret = max_tcpci_read8(chip, TCPC_ALERT_EXTENDED, &reg_status);
if (ret < 0)
return ret;
ret = max_tcpci_write8(chip, TCPC_ALERT_EXTENDED, reg_status);
if (ret < 0)
return ret;
if (reg_status & TCPC_SINK_FAST_ROLE_SWAP) {
dev_info(chip->dev, "FRS Signal");
tcpm_sink_frs(chip->port);
}
}
if (status & TCPC_ALERT_RX_STATUS)
process_rx(chip, status);