The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x 23e60c8daf5ec2ab1b731310761b668745fcf6ed # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023090317-recent-elliptic-804b@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
23e60c8daf5e ("usb: typec: tcpci: clear the fault status bit")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 23e60c8daf5ec2ab1b731310761b668745fcf6ed Mon Sep 17 00:00:00 2001 From: Marco Felsch m.felsch@pengutronix.de Date: Wed, 16 Aug 2023 14:25:02 -0300 Subject: [PATCH] usb: typec: tcpci: clear the fault status bit
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
diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index fc708c289a73..0ee3e6e29bb1 100644 --- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -602,6 +602,10 @@ 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/include/linux/usb/tcpci.h b/include/linux/usb/tcpci.h index 85e95a3251d3..83376473ac76 100644 --- a/include/linux/usb/tcpci.h +++ b/include/linux/usb/tcpci.h @@ -103,6 +103,7 @@ #define TCPC_POWER_STATUS_SINKING_VBUS BIT(0)
#define TCPC_FAULT_STATUS 0x1f +#define TCPC_FAULT_STATUS_ALL_REG_RST_TO_DEFAULT BIT(7)
#define TCPC_ALERT_EXTENDED 0x21