On 24/06/2024 15:33, Dmitry Baryshkov wrote:
On Mon, 24 Jun 2024 at 16:42, Jon Hunter <jonathanh@xxxxxxxxxx> wrote:
On 24/06/2024 13:51, Jon Hunter wrote:
Hi Jameson,
On 10/05/2024 21:12, Jameson Thies wrote:
Providing the number of known alternate modes allows user space to
determine when device registration has completed. Always register a
number of known alternate modes for the partner and cable plug, even
when the number of supported alternate modes is 0.
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Reviewed-by: Benson Leung <bleung@xxxxxxxxxxxx>
Signed-off-by: Jameson Thies <jthies@xxxxxxxxxx>
---
Changes in V5:
- None.
Changes in V4:
- None.
Changes in V3:
- None.
Changes in V2:
- None.
drivers/usb/typec/ucsi/ucsi.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/typec/ucsi/ucsi.c
b/drivers/usb/typec/ucsi/ucsi.c
index bb6e57064513d..52a14bfe4107e 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -812,10 +812,11 @@ static int ucsi_check_altmodes(struct
ucsi_connector *con)
/* Ignoring the errors in this case. */
if (con->partner_altmode[0]) {
num_partner_am = ucsi_get_num_altmode(con->partner_altmode);
- if (num_partner_am > 0)
- typec_partner_set_num_altmodes(con->partner,
num_partner_am);
+ typec_partner_set_num_altmodes(con->partner, num_partner_am);
ucsi_altmode_update_active(con);
return 0;
+ } else {
+ typec_partner_set_num_altmodes(con->partner, 0);
}
return ret;
@@ -1138,7 +1139,7 @@ static int ucsi_check_connection(struct
ucsi_connector *con)
static int ucsi_check_cable(struct ucsi_connector *con)
{
u64 command;
- int ret;
+ int ret, num_plug_am;
if (con->cable)
return 0;
@@ -1172,6 +1173,13 @@ static int ucsi_check_cable(struct
ucsi_connector *con)
return ret;
}
+ if (con->plug_altmode[0]) {
+ num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
+ typec_plug_set_num_altmodes(con->plug, num_plug_am);
+ } else {
+ typec_plug_set_num_altmodes(con->plug, 0);
+ }
+
return 0;
}
Looking at this some more, the plug is only registered in
ucsi_check_cable() if UCSI_CAP_ALT_MODE_DETAILS is specified
for the Type C controller. The Cypress CCG explicitly clears
this flag.
The following will only call typec_plug_set_num_altmodes()
if the call to ucsi_register_plug() is successful ...
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 134ef4e17d85..e268af88a7d2 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1176,13 +1176,13 @@ static int ucsi_check_cable(struct ucsi_connector *con)
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
if (ret < 0)
return ret;
- }
- if (con->plug_altmode[0]) {
- num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
- typec_plug_set_num_altmodes(con->plug, num_plug_am);
- } else {
- typec_plug_set_num_altmodes(con->plug, 0);
+ if (con->plug_altmode[0]) {
+ num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
+ typec_plug_set_num_altmodes(con->plug, num_plug_am);
+ } else {
+ typec_plug_set_num_altmodes(con->plug, 0);
+ }
}
return 0;
It is crashing because 'con->plug' is not initialised when
typec_plug_set_num_altmodes() is called. Do we need to add a check to
see if 'con->plug' is valid in ucsi_check_cable()?
Yes. Either of con->calbe and con->plug can be NULL.
Thanks for confirming.
Jon
--
nvpublic
