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authorKyle Tso <kyletso@google.com>2021-02-05 11:34:12 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-02-09 11:48:55 +0100
commit372adf075a43028a62e6123b9cd969f8f20e4afc (patch)
tree4a11448b78e97c1ab87578a1535cdb0cdbe864b2 /drivers/usb
parent5e1d4c49fbc86dab6e005d66f066bd53c9479cde (diff)
usb: typec: ucsi: Determine common SVDM Version
This patch implements the following requirement in the Spec. PD Spec Revision 3.0 Version 2.0 + ECNs 2020-12-10 6.4.4.2.3 Structured VDM Version "The Structured VDM Version field of the Discover Identity Command sent and received during VDM discovery Shall be used to determine the lowest common Structured VDM Version supported by the Port Partners or Cable Plug and Shall continue to operate using this Specification Revision until they are Detached." Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Kyle Tso <kyletso@google.com> Link: https://lore.kernel.org/r/20210205033415.3320439-5-kyletso@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/typec/ucsi/displayport.c32
-rw-r--r--drivers/usb/typec/ucsi/ucsi.c1
2 files changed, 30 insertions, 3 deletions
diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c
index 1d387bddefb9..73cd5bf35047 100644
--- a/drivers/usb/typec/ucsi/displayport.c
+++ b/drivers/usb/typec/ucsi/displayport.c
@@ -49,6 +49,7 @@ static int ucsi_displayport_enter(struct typec_altmode *alt, u32 *vdo)
{
struct ucsi_dp *dp = typec_altmode_get_drvdata(alt);
struct ucsi *ucsi = dp->con->ucsi;
+ int svdm_version;
u64 command;
u8 cur = 0;
int ret;
@@ -83,7 +84,13 @@ static int ucsi_displayport_enter(struct typec_altmode *alt, u32 *vdo)
* mode, and letting the alt mode driver continue.
*/
- dp->header = VDO(USB_TYPEC_DP_SID, 1, SVDM_VER_1_0, CMD_ENTER_MODE);
+ svdm_version = typec_altmode_get_svdm_version(alt);
+ if (svdm_version < 0) {
+ ret = svdm_version;
+ goto err_unlock;
+ }
+
+ dp->header = VDO(USB_TYPEC_DP_SID, 1, svdm_version, CMD_ENTER_MODE);
dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
@@ -101,6 +108,7 @@ err_unlock:
static int ucsi_displayport_exit(struct typec_altmode *alt)
{
struct ucsi_dp *dp = typec_altmode_get_drvdata(alt);
+ int svdm_version;
u64 command;
int ret = 0;
@@ -120,7 +128,13 @@ static int ucsi_displayport_exit(struct typec_altmode *alt)
if (ret < 0)
goto out_unlock;
- dp->header = VDO(USB_TYPEC_DP_SID, 1, SVDM_VER_1_0, CMD_EXIT_MODE);
+ svdm_version = typec_altmode_get_svdm_version(alt);
+ if (svdm_version < 0) {
+ ret = svdm_version;
+ goto out_unlock;
+ }
+
+ dp->header = VDO(USB_TYPEC_DP_SID, 1, svdm_version, CMD_EXIT_MODE);
dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
@@ -186,6 +200,7 @@ static int ucsi_displayport_vdm(struct typec_altmode *alt,
struct ucsi_dp *dp = typec_altmode_get_drvdata(alt);
int cmd_type = PD_VDO_CMDT(header);
int cmd = PD_VDO_CMD(header);
+ int svdm_version;
mutex_lock(&dp->con->lock);
@@ -198,9 +213,20 @@ static int ucsi_displayport_vdm(struct typec_altmode *alt,
return -EOPNOTSUPP;
}
+ svdm_version = typec_altmode_get_svdm_version(alt);
+ if (svdm_version < 0) {
+ mutex_unlock(&dp->con->lock);
+ return svdm_version;
+ }
+
switch (cmd_type) {
case CMDT_INIT:
- dp->header = VDO(USB_TYPEC_DP_SID, 1, SVDM_VER_1_0, cmd);
+ if (PD_VDO_SVDM_VER(header) < svdm_version) {
+ typec_partner_set_svdm_version(dp->con->partner, PD_VDO_SVDM_VER(header));
+ svdm_version = PD_VDO_SVDM_VER(header);
+ }
+
+ dp->header = VDO(USB_TYPEC_DP_SID, 1, svdm_version, cmd);
dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
switch (cmd) {
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index ca3f4194ad90..244270755ae6 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1052,6 +1052,7 @@ static int ucsi_register_port(struct ucsi *ucsi, int index)
cap->revision = ucsi->cap.typec_version;
cap->pd_revision = ucsi->cap.pd_version;
+ cap->svdm_version = SVDM_VER_2_0;
cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY)