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Date: Thu, 22 Mar 2018 13:32:11 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sebastian Reichel <sre@...nel.org>,
Hans de Goede <hdegoede@...hat.com>, Jun Li <jun.li@....com>,
linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, support.opensource@...semi.com
Subject: Re: [PATCH v6 6/6] typec: tcpm: Add support for sink PPS related
messages
On Thu, Mar 22, 2018 at 03:52:07PM +0000, Adam Thomson wrote:
> This commit adds sink side support for Get_Status, Status,
> Get_PPS_Status and PPS_Status handling. As there's the
> potential for a partner to respond with Not_Supported,
> handling of this message is also added. Sending of
> Not_Supported is added to handle messagescreceived but not
> yet handled.
>
> Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> drivers/usb/typec/tcpm.c | 143 ++++++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 134 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
> index c859cba..fffe97d 100644
> --- a/drivers/usb/typec/tcpm.c
> +++ b/drivers/usb/typec/tcpm.c
> @@ -19,7 +19,9 @@
> #include <linux/slab.h>
> #include <linux/spinlock.h>
> #include <linux/usb/pd.h>
> +#include <linux/usb/pd_ado.h>
> #include <linux/usb/pd_bdo.h>
> +#include <linux/usb/pd_ext_sdb.h>
> #include <linux/usb/pd_vdo.h>
> #include <linux/usb/tcpm.h>
> #include <linux/usb/typec.h>
> @@ -113,6 +115,11 @@
> S(SNK_TRYWAIT_VBUS), \
> S(BIST_RX), \
> \
> + S(GET_STATUS_SEND), \
> + S(GET_STATUS_SEND_TIMEOUT), \
> + S(GET_PPS_STATUS_SEND), \
> + S(GET_PPS_STATUS_SEND_TIMEOUT), \
> + \
> S(ERROR_RECOVERY), \
> S(PORT_RESET), \
> S(PORT_RESET_WAIT_OFF)
> @@ -143,6 +150,7 @@ enum pd_msg_request {
> PD_MSG_NONE = 0,
> PD_MSG_CTRL_REJECT,
> PD_MSG_CTRL_WAIT,
> + PD_MSG_CTRL_NOT_SUPP,
> PD_MSG_DATA_SINK_CAP,
> PD_MSG_DATA_SOURCE_CAP,
> };
> @@ -1398,10 +1406,42 @@ static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
> /*
> * PD (data, control) command handling functions
> */
> +static inline enum tcpm_state ready_state(struct tcpm_port *port)
> +{
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_READY;
> + else
> + return SNK_READY;
> +}
>
> static int tcpm_pd_send_control(struct tcpm_port *port,
> enum pd_ctrl_msg_type type);
>
> +static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
> + int cnt)
> +{
> + u32 p0 = le32_to_cpu(payload[0]);
> + unsigned int type = usb_pd_ado_type(p0);
> +
> + if (!type) {
> + tcpm_log(port, "Alert message received with no type");
> + return;
> + }
> +
> + /* Just handling non-battery alerts for now */
> + if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_set_state(port, GET_STATUS_SEND, 0);
> + break;
> + default:
> + tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> + break;
> + }
> + }
> +}
> +
> static void tcpm_pd_data_request(struct tcpm_port *port,
> const struct pd_message *msg)
> {
> @@ -1487,6 +1527,14 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
> tcpm_set_state(port, BIST_RX, 0);
> }
> break;
> + case PD_DATA_ALERT:
> + tcpm_handle_alert(port, msg->payload, cnt);
> + break;
> + case PD_DATA_BATT_STATUS:
> + case PD_DATA_GET_COUNTRY_INFO:
> + /* Currently unsupported */
> + tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
> + break;
> default:
> tcpm_log(port, "Unhandled data message type %#x", type);
> break;
> @@ -1569,6 +1617,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> break;
> case PD_CTRL_REJECT:
> case PD_CTRL_WAIT:
> + case PD_CTRL_NOT_SUPP:
> switch (port->state) {
> case SNK_NEGOTIATE_CAPABILITIES:
> /* USB PD specification, Figure 8-43 */
> @@ -1688,12 +1737,75 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> break;
> }
> break;
> + case PD_CTRL_GET_SOURCE_CAP_EXT:
> + case PD_CTRL_GET_STATUS:
> + case PD_CTRL_FR_SWAP:
> + case PD_CTRL_GET_PPS_STATUS:
> + case PD_CTRL_GET_COUNTRY_CODES:
> + /* Currently not supported */
> + tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
> + break;
> default:
> tcpm_log(port, "Unhandled ctrl message type %#x", type);
> break;
> }
> }
>
> +static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
> + const struct pd_message *msg)
> +{
> + enum pd_ext_msg_type type = pd_header_type_le(msg->header);
> + unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
> +
> + if (!(msg->ext_msg.header && PD_EXT_HDR_CHUNKED)) {
> + tcpm_log(port, "Unchunked extended messages unsupported");
> + return;
> + }
> +
> + if (data_size > (PD_EXT_MAX_CHUNK_DATA)) {
I really think you can trust that the compiler understands that it is supposed
to compare against PD_EXT_MAX_CHUNK_DATA.
> + tcpm_log(port, "Chunk handling not yet supported");
> + return;
> + }
> +
> + switch (type) {
> + case PD_EXT_STATUS:
> + /*
> + * If PPS related events raised then get PPS status to clear
> + * (see USB PD 3.0 Spec, 6.5.2.4)
> + */
> + if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
> + USB_PD_EXT_SDB_PPS_EVENTS)
> + tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
> + else
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case PD_EXT_PPS_STATUS:
> + /*
> + * For now the PPS status message is used to clear events
> + * and nothing more.
> + */
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case PD_EXT_SOURCE_CAP_EXT:
> + case PD_EXT_GET_BATT_CAP:
> + case PD_EXT_GET_BATT_STATUS:
> + case PD_EXT_BATT_CAP:
> + case PD_EXT_GET_MANUFACTURER_INFO:
> + case PD_EXT_MANUFACTURER_INFO:
> + case PD_EXT_SECURITY_REQUEST:
> + case PD_EXT_SECURITY_RESPONSE:
> + case PD_EXT_FW_UPDATE_REQUEST:
> + case PD_EXT_FW_UPDATE_RESPONSE:
> + case PD_EXT_COUNTRY_INFO:
> + case PD_EXT_COUNTRY_CODES:
> + tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
> + break;
> + default:
> + tcpm_log(port, "Unhandle extended message type %#x", type);
s/Unhandle/Unhandled/
> + break;
> + }
> +}
> +
> static void tcpm_pd_rx_handler(struct work_struct *work)
> {
> struct pd_rx_event *event = container_of(work,
> @@ -1734,7 +1846,9 @@ static void tcpm_pd_rx_handler(struct work_struct *work)
> "Data role mismatch, initiating error recovery");
> tcpm_set_state(port, ERROR_RECOVERY, 0);
> } else {
> - if (cnt)
> + if (msg->header & PD_HEADER_EXT_HDR)
> + tcpm_pd_ext_msg_request(port, msg);
> + else if (cnt)
> tcpm_pd_data_request(port, msg);
> else
> tcpm_pd_ctrl_request(port, msg);
> @@ -1795,6 +1909,9 @@ static bool tcpm_send_queued_message(struct tcpm_port *port)
> case PD_MSG_CTRL_REJECT:
> tcpm_pd_send_control(port, PD_CTRL_REJECT);
> break;
> + case PD_MSG_CTRL_NOT_SUPP:
> + tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
> + break;
> case PD_MSG_DATA_SINK_CAP:
> tcpm_pd_send_sink_caps(port);
> break;
> @@ -2481,14 +2598,6 @@ static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
> return SNK_UNATTACHED;
> }
>
> -static inline enum tcpm_state ready_state(struct tcpm_port *port)
> -{
> - if (port->pwr_role == TYPEC_SOURCE)
> - return SRC_READY;
> - else
> - return SNK_READY;
> -}
> -
> static inline enum tcpm_state unattached_state(struct tcpm_port *port)
> {
> if (port->port_type == TYPEC_PORT_DRP) {
> @@ -3191,6 +3300,22 @@ static void run_state_machine(struct tcpm_port *port)
> /* Always switch to unattached state */
> tcpm_set_state(port, unattached_state(port), 0);
> break;
> + case GET_STATUS_SEND:
> + tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
> + tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
> + PD_T_SENDER_RESPONSE);
> + break;
> + case GET_STATUS_SEND_TIMEOUT:
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case GET_PPS_STATUS_SEND:
> + tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
> + tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
> + PD_T_SENDER_RESPONSE);
> + break;
> + case GET_PPS_STATUS_SEND_TIMEOUT:
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> case ERROR_RECOVERY:
> tcpm_swap_complete(port, -EPROTO);
> tcpm_pps_complete(port, -EPROTO);
> --
> 1.9.1
>
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