This is a note to let you know that I've just added the patch titled
usb: typec: tcpm: Fix altmode re-registration causes sysfs create fail
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-typec-tcpm-fix-altmode-re-registration-causes-sysfs-create-fail.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 36f78477ac2c89e9a2eed4a31404a291a3450b5d Mon Sep 17 00:00:00 2001
From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
Date: Mon, 9 Jan 2023 15:19:50 +0800
Subject: usb: typec: tcpm: Fix altmode re-registration causes sysfs create fail
From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
commit 36f78477ac2c89e9a2eed4a31404a291a3450b5d upstream.
There's the altmode re-registeration issue after data role
swap (DR_SWAP).
Comparing to USBPD 2.0, in USBPD 3.0, it loose the limit that only DFP
can initiate the VDM command to get partner identity information.
For a USBPD 3.0 UFP device, it may already get the identity information
from its port partner before DR_SWAP. If DR_SWAP send or receive at the
mean time, 'send_discover' flag will be raised again. It causes discover
identify action restart while entering ready state. And after all
discover actions are done, the 'tcpm_register_altmodes' will be called.
If old altmode is not unregistered, this sysfs create fail can be found.
In 'DR_SWAP_CHANGE_DR' state case, only DFP will unregister altmodes.
For UFP, the original altmodes keep registered.
This patch fix the logic that after DR_SWAP, 'tcpm_unregister_altmodes'
must be called whatever the current data role is.
Reviewed-by: Macpaul Lin <macpaul.lin@xxxxxxxxxxxx>
Fixes: ae8a2ca8a221 ("usb: typec: Group all TCPCI/TCPM code together")
Reported-by: TommyYl Chen <tommyyl.chen@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1673248790-15794-1-git-send-email-cy_huang@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/typec/tcpm/tcpm.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4594,14 +4594,13 @@ static void run_state_machine(struct tcp
tcpm_set_state(port, ready_state(port), 0);
break;
case DR_SWAP_CHANGE_DR:
- if (port->data_role == TYPEC_HOST) {
- tcpm_unregister_altmodes(port);
+ tcpm_unregister_altmodes(port);
+ if (port->data_role == TYPEC_HOST)
tcpm_set_roles(port, true, port->pwr_role,
TYPEC_DEVICE);
- } else {
+ else
tcpm_set_roles(port, true, port->pwr_role,
TYPEC_HOST);
- }
tcpm_ams_finish(port);
tcpm_set_state(port, ready_state(port), 0);
break;
Patches currently in stable-queue which might be from cy_huang@xxxxxxxxxxx are
queue-6.1/usb-typec-tcpm-fix-altmode-re-registration-causes-sysfs-create-fail.patch
