[PATCH 6/7] platform/chrome: cros_ec_typec: Parse partner PD ID VDOs

Prashant Malani
2020-10-21T20:54:23Z

Use EC_CMD_TYPE_DISCOVERY to retrieve and store the discovery data for
the port partner. With that data, update the PD Identity VDO values for
the partner, which were earlier not initialized.

Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
drivers/platform/chrome/cros_ec_typec.c | 60 ++++++++++++++++++++++++-
1 file changed, 59 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 98d22720b365..53d0b4b4fcd7 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -14,6 +14,7 @@
#include <linux/platform_data/cros_usbpd_notify.h>
#include <linux/platform_device.h>
#include <linux/usb/pd.h>
+#include <linux/usb/pd_vdo.h>
#include <linux/usb/typec.h>
#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_dp.h>
@@ -51,6 +52,7 @@ struct cros_typec_port {

/* Flag indicating that PD discovery data parsing is completed. */
bool disc_done;
+ struct ec_response_typec_discovery *sop_disc;
};

/* Platform-specific data for the Chrome OS EC Type C controller. */
@@ -298,6 +300,12 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
port_num);

cros_typec_register_port_altmodes(typec, port_num);
+
+ cros_port->sop_disc = devm_kzalloc(dev, EC_PROTO2_MAX_RESPONSE_SIZE, GFP_KERNEL);
+ if (!cros_port->sop_disc) {
+ ret = -ENOMEM;
+ goto unregister_ports;
+ }
}

return 0;
@@ -582,6 +590,51 @@ static int cros_typec_get_mux_info(struct cros_typec_data *typec, int port_num,
sizeof(req), resp, sizeof(*resp));
}

+static int cros_typec_handle_sop_disc(struct cros_typec_data *typec, int port_num)
+{
+ struct cros_typec_port *port = typec->ports[port_num];
+ struct ec_response_typec_discovery *sop_disc = port->sop_disc;
+ struct ec_params_typec_discovery req = {
+ .port = port_num,
+ .partner_type = TYPEC_PARTNER_SOP,
+ };
+ int ret = 0;
+ int i;
+
+ if (!port->partner) {
+ dev_err(typec->dev,
+ "SOP Discovery received without partner registered, port: %d\n",
+ port_num);
+ ret = -EINVAL;
+ goto disc_exit;
+ }
+
+ memset(sop_disc, 0, EC_PROTO2_MAX_RESPONSE_SIZE);
+ ret = cros_typec_ec_command(typec, 0, EC_CMD_TYPEC_DISCOVERY, &req, sizeof(req),
+ sop_disc, EC_PROTO2_MAX_RESPONSE_SIZE);
+ if (ret < 0) {
+ dev_err(typec->dev, "Failed to get SOP discovery data for port: %d\n", port_num);
+ goto disc_exit;
+ }
+
+ /* First, update the PD identity VDOs for the partner. */
+ if (sop_disc->identity_count > 0)
+ port->p_identity.id_header = sop_disc->discovery_vdo[0];
+ if (sop_disc->identity_count > 1)
+ port->p_identity.cert_stat = sop_disc->discovery_vdo[1];
+ if (sop_disc->identity_count > 2)
+ port->p_identity.product = sop_disc->discovery_vdo[2];
+
+ /* Copy the remaining identity VDOs till a maximum of 6. */
+ for (i = 3; i < sop_disc->identity_count && i < VDO_MAX_OBJECTS; i++)
+ port->p_identity.vdo[i - 3] = sop_disc->discovery_vdo[i];
+
+ ret = typec_partner_set_identity(port->partner);
+
+disc_exit:
+ return ret;
+}
+
static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num)
{
struct ec_response_typec_status resp;
@@ -602,7 +655,12 @@ static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num

/* Handle any events appropriately. */
if (resp.events & PD_STATUS_EVENT_SOP_DISC_DONE) {
- dev_dbg(typec->dev, "SOP Discovery done for port: %d\n", port_num);
+ ret = cros_typec_handle_sop_disc(typec, port_num);
+ if (ret < 0) {
+ dev_err(typec->dev, "Couldn't parse SOP Disc data, port: %d\n", port_num);
+ return;
+ }
+
typec->ports[port_num]->disc_done = true;
}
}
--
2.29.0.rc1.297.gfa9743e501-goog