5.4-stable review patch. If anyone has any objections, please let me know.
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From: Marco Felsch m.felsch@pengutronix.de
[ Upstream commit 23e60c8daf5ec2ab1b731310761b668745fcf6ed ]
According the "USB Type-C Port Controller Interface Specification v2.0" the TCPC sets the fault status register bit-7 (AllRegistersResetToDefault) once the registers have been reset to their default values.
This triggers an alert(-irq) on PTN5110 devices albeit we do mask the fault-irq, which may cause a kernel hang. Fix this generically by writing a one to the corresponding bit-7.
Cc: stable@vger.kernel.org Fixes: 74e656d6b055 ("staging: typec: Type-C Port Controller Interface driver (tcpci)") Reported-by: "Angus Ainslie (Purism)" angus@akkea.ca Closes: https://lore.kernel.org/all/20190508002749.14816-2-angus@akkea.ca/ Reported-by: Christian Bach christian.bach@scs.ch Closes: https://lore.kernel.org/regressions/ZR0P278MB07737E5F1D48632897D51AC3EB329@Z... Signed-off-by: Marco Felsch m.felsch@pengutronix.de Signed-off-by: Fabio Estevam festevam@denx.de Reviewed-by: Guenter Roeck linux@roeck-us.net Link: https://lore.kernel.org/r/20230816172502.1155079-1-festevam@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/typec/tcpm/tcpci.c | 4 ++++ drivers/usb/typec/tcpm/tcpci.h | 1 + 2 files changed, 5 insertions(+)
diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index 84b23ae48aeec..ccb72875c8ee5 100644 --- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -379,6 +379,10 @@ static int tcpci_init(struct tcpc_dev *tcpc) if (time_after(jiffies, timeout)) return -ETIMEDOUT;
+ ret = tcpci_write16(tcpci, TCPC_FAULT_STATUS, TCPC_FAULT_STATUS_ALL_REG_RST_TO_DEFAULT); + if (ret < 0) + return ret; + /* Handle vendor init */ if (tcpci->data->init) { ret = tcpci->data->init(tcpci, tcpci->data); diff --git a/drivers/usb/typec/tcpm/tcpci.h b/drivers/usb/typec/tcpm/tcpci.h index 303ebde265465..dcf60399f161f 100644 --- a/drivers/usb/typec/tcpm/tcpci.h +++ b/drivers/usb/typec/tcpm/tcpci.h @@ -72,6 +72,7 @@ #define TCPC_POWER_STATUS_VBUS_PRES BIT(2)
#define TCPC_FAULT_STATUS 0x1f +#define TCPC_FAULT_STATUS_ALL_REG_RST_TO_DEFAULT BIT(7)
#define TCPC_COMMAND 0x23 #define TCPC_CMD_WAKE_I2C 0x11