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authorBadhri Jagan Sridharan <badhri@google.com>2020-10-07 23:15:49 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-10-08 09:44:42 +0200
commitafb487a31d33e250511cd1774368775df8a6f43e (patch)
tree150a4a07052d1662806f93ec6e55141d3d0c89ff /drivers/usb
parent11121c2406c8cc0ee493644233fbdc7fe0598981 (diff)
downloadlinux-afb487a31d33e250511cd1774368775df8a6f43e.tar.bz2
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/typec/tcpm/tcpci_maxim.c50
1 files changed, 46 insertions, 4 deletions
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c
index 91337ddb4962..723d7dd38f75 100644
--- a/drivers/usb/typec/tcpm/tcpci_maxim.c
+++ b/drivers/usb/typec/tcpm/tcpci_maxim.c
@@ -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);