summaryrefslogtreecommitdiff
path: root/drivers/usb/typec/tcpm/tcpm.c
diff options
context:
space:
mode:
authorFrank Wang <frank.wang@rock-chips.com>2023-03-16 16:11:49 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-04-20 11:04:42 +0200
commitdac3b192107b978198e89ec0f77375738352e0c8 (patch)
tree84e05ee03343fc66628c706cd4c4fa0b24307b5e /drivers/usb/typec/tcpm/tcpm.c
parent9a4d7dd1990383df8ffa09d6879cecb0534405e1 (diff)
usb: typec: tcpm: fix multiple times discover svids error
PD3.0 Spec 6.4.4.3.2 say that only Responder supports 12 or more SVIDs, the Discover SVIDs Command Shall be executed multiple times until a Discover SVIDs VDO is returned ending either with a SVID value of 0x0000 in the last part of the last VDO or with a VDO containing two SVIDs with values of 0x0000. In the current implementation, if the last VDO does not find that the Discover SVIDs Command would be executed multiple times even if the Responder SVIDs are less than 12, and we found some odd dockers just meet this case. So fix it. Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Frank Wang <frank.wang@rock-chips.com> Link: https://lore.kernel.org/r/20230316081149.24519-1-frank.wang@rock-chips.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/typec/tcpm/tcpm.c')
-rw-r--r--drivers/usb/typec/tcpm/tcpm.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 4e276d2f15d1..3c6b0c8e2d3a 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -1523,7 +1523,21 @@ static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
pmdata->svids[pmdata->nsvids++] = svid;
tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
}
- return true;
+
+ /*
+ * PD3.0 Spec 6.4.4.3.2: The SVIDs are returned 2 per VDO (see Table
+ * 6-43), and can be returned maximum 6 VDOs per response (see Figure
+ * 6-19). If the Respondersupports 12 or more SVID then the Discover
+ * SVIDs Command Shall be executed multiple times until a Discover
+ * SVIDs VDO is returned ending either with a SVID value of 0x0000 in
+ * the last part of the last VDO or with a VDO containing two SVIDs
+ * with values of 0x0000.
+ *
+ * However, some odd dockers support SVIDs less than 12 but without
+ * 0x0000 in the last VDO, so we need to break the Discover SVIDs
+ * request and return false here.
+ */
+ return cnt == 7;
abort:
tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
return false;