lkml.org 
[lkml]   [2023]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/4] usb: typec: tcpm: fix cc role at port reset
Date
In the current implementation, the tcpm set CC1/CC2 role to open when
it do port reset would cause the VBUS removed by the Type-C partner.

The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
in DRP initialization and connection detection.

So set CC1/CC2 to Rd to fix it.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
---
drivers/usb/typec/tcpm/tcpm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index a0d943d785800..66de02a56f512 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4851,7 +4851,7 @@ static void run_state_machine(struct tcpm_port *port)
break;
case PORT_RESET:
tcpm_reset_port(port);
- tcpm_set_cc(port, TYPEC_CC_OPEN);
+ tcpm_set_cc(port, TYPEC_CC_RD);
tcpm_set_state(port, PORT_RESET_WAIT_OFF,
PD_T_ERROR_RECOVERY);
break;
--
2.17.1
\
 
 \ /
  Last update: 2023-03-27 00:55    [W:0.117 / U:0.864 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site