From patchwork Fri May 7 06:22:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kyle Tso X-Patchwork-Id: 432416 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 209D1C433B4 for ; Fri, 7 May 2021 06:23:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9910613DD for ; Fri, 7 May 2021 06:23:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233663AbhEGGYM (ORCPT ); Fri, 7 May 2021 02:24:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60774 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232896AbhEGGYK (ORCPT ); Fri, 7 May 2021 02:24:10 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B84FBC061763 for ; Thu, 6 May 2021 23:23:10 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id d64-20020a6368430000b02902104a07607cso4768906pgc.1 for ; Thu, 06 May 2021 23:23:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=CAdpc8uV82KrHrWTg/h8bFG11oNTJ3L3pZ5aH8DIgW0=; b=JWFbgm3ZYE75AVcrX2V748w9kWED0hI5OevFmn9dFBXIxMwCe1Fx9mdr4/Q1A1tcDe k5gj1Zbm0HjIwRl+paAa4wK6e3Xx+5/JMCdyDsmMNhPAGQwWsqcNs0R+RjKtDaGsgFlk rU3mXc83rHOfKxlmud1STNLP7xWLoP6yy3Ek88p99lRtCWE29lpIzkxiyh8FgzBudQdn zwcobDCCOKIxkmO4FTSSTbWwBH9AvgY4DVLTNCWx4UD1MhbQN/S9rNKMymXIm3p29etS c9U+N+rt6nI+PuU2ra4W+BlSdsauXqmI5vOUPfOjFCGZu4XLoD9noxk9FNeILbz0yTP/ TKPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=CAdpc8uV82KrHrWTg/h8bFG11oNTJ3L3pZ5aH8DIgW0=; b=q0TdBLDm1LgyfKPk4R8Vf7L+5REpc6y66P/Vl0cljUbGdhy+m0nSdBsJFPmwEXY54+ j/Bdo4eza4d8hMuKfRGtLboLSd8YopGcN2VbF7mvko66CLRlzkscPgdF9a4zEAh4b47z f19RSO4T7L2bbxFPP0lh0KA9cII6UnU4mQPIL5XRo2dEhbT2dG2FW07B70Yht8jEJspl 3JUW5H4+wOm5o8Ip2V4J1E3wwEm5DlfaOEwd7blUCdKvmmic/MAKfeTHN8NBrQiTRo41 3C78TjIR+YUAkasrmMUlj1DutSWZG8tJDYnZyJscqZaNMhf9BRmZcvhi/pGtzydF9cnC 2QhA== X-Gm-Message-State: AOAM531liWNuhoX8qyqyLjLl3mIhdplvajJ+Gn2slcU2sRkGDBmZ4Z2y aHblpObfT/cnX0TVXgdV1Ppd537jSRQm X-Google-Smtp-Source: ABdhPJxxUzUnDwfpShSXP9Sn9aXJUvCyX9YH14rEuGDb4vNxrCcra/N4cyg4a9OHEQL9Z5PDxivDte3osuAR X-Received: from kyletso.ntc.corp.google.com ([2401:fa00:fc:202:9a5c:8de0:4c79:ba52]) (user=kyletso job=sendgmr) by 2002:a17:90a:c7c8:: with SMTP id gf8mr21692067pjb.113.1620368590221; Thu, 06 May 2021 23:23:10 -0700 (PDT) Date: Fri, 7 May 2021 14:22:59 +0800 In-Reply-To: <20210507062300.1945009-1-kyletso@google.com> Message-Id: <20210507062300.1945009-2-kyletso@google.com> Mime-Version: 1.0 References: <20210507062300.1945009-1-kyletso@google.com> X-Mailer: git-send-email 2.31.1.607.g51e8a6a459-goog Subject: [PATCH v3 1/2] usb: typec: tcpm: Send DISCOVER_IDENTITY from dedicated work From: Kyle Tso To: linux@roeck-us.net, heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org Cc: badhri@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Tso Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org In current design, DISCOVER_IDENTITY is queued to VDM state machine immediately in Ready states and never retries if it fails in the AMS. Move the process to a delayed work so that when it fails for some reasons (e.g. Sink Tx No Go), it can be retried by queueing the work again. Also fix a problem that the vdm_state is not set to a proper state if it is blocked by Collision Avoidance mechanism. Reviewed-by: Guenter Roeck Acked-by: Heikki Krogerus Signed-off-by: Kyle Tso --- Changes since v2: - no code changes - add "Reviewed-by:" and "Acked-by:" from v1 mail thread drivers/usb/typec/tcpm/tcpm.c | 85 ++++++++++++++++++++++++++++++----- 1 file changed, 75 insertions(+), 10 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index c4fdc00a3bc8..07a449f0e8fa 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -259,6 +259,7 @@ enum frs_typec_current { #define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX) #define GET_SINK_CAP_RETRY_MS 100 +#define SEND_DISCOVER_RETRY_MS 100 struct pd_mode_data { int svid_index; /* current SVID index */ @@ -366,6 +367,8 @@ struct tcpm_port { struct kthread_work vdm_state_machine; struct hrtimer enable_frs_timer; struct kthread_work enable_frs; + struct hrtimer send_discover_timer; + struct kthread_work send_discover_work; bool state_machine_running; bool vdm_sm_running; @@ -1178,6 +1181,16 @@ static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int del } } +static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms) +{ + if (delay_ms) { + hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL); + } else { + hrtimer_cancel(&port->send_discover_timer); + kthread_queue_work(port->wq, &port->send_discover_work); + } +} + static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state, unsigned int delay_ms) { @@ -1855,6 +1868,9 @@ static void vdm_run_state_machine(struct tcpm_port *port) res = tcpm_ams_start(port, DISCOVER_IDENTITY); if (res == 0) port->send_discover = false; + else if (res == -EAGAIN) + mod_send_discover_delayed_work(port, + SEND_DISCOVER_RETRY_MS); break; case CMD_DISCOVER_SVID: res = tcpm_ams_start(port, DISCOVER_SVIDS); @@ -1880,6 +1896,7 @@ static void vdm_run_state_machine(struct tcpm_port *port) } if (res < 0) { + port->vdm_state = VDM_STATE_ERR_BUSY; port->vdm_sm_running = false; return; } @@ -3682,14 +3699,6 @@ static inline enum tcpm_state unattached_state(struct tcpm_port *port) return SNK_UNATTACHED; } -static void tcpm_check_send_discover(struct tcpm_port *port) -{ - if ((port->data_role == TYPEC_HOST || port->negotiated_rev > PD_REV20) && - port->send_discover && port->pd_capable) - tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0); - port->send_discover = false; -} - static void tcpm_swap_complete(struct tcpm_port *port, int result) { if (port->swap_pending) { @@ -3926,7 +3935,18 @@ static void run_state_machine(struct tcpm_port *port) break; } - tcpm_check_send_discover(port); + /* + * 6.4.4.3.1 Discover Identity + * "The Discover Identity Command Shall only be sent to SOP when there is an + * Explicit Contract." + * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using + * port->explicit_contract to decide whether to send the command. + */ + if (port->explicit_contract) + mod_send_discover_delayed_work(port, 0); + else + port->send_discover = false; + /* * 6.3.5 * Sending ping messages is not necessary if @@ -4194,7 +4214,18 @@ static void run_state_machine(struct tcpm_port *port) break; } - tcpm_check_send_discover(port); + /* + * 6.4.4.3.1 Discover Identity + * "The Discover Identity Command Shall only be sent to SOP when there is an + * Explicit Contract." + * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using + * port->explicit_contract. + */ + if (port->explicit_contract) + mod_send_discover_delayed_work(port, 0); + else + port->send_discover = false; + power_supply_changed(port->psy); break; @@ -5288,6 +5319,29 @@ static void tcpm_enable_frs_work(struct kthread_work *work) mutex_unlock(&port->lock); } +static void tcpm_send_discover_work(struct kthread_work *work) +{ + struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work); + + mutex_lock(&port->lock); + /* No need to send DISCOVER_IDENTITY anymore */ + if (!port->send_discover) + goto unlock; + + /* Retry if the port is not idle */ + if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) { + mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS); + goto unlock; + } + + /* Only send the Message if the port is host for PD rev2.0 */ + if (port->data_role == TYPEC_HOST || port->negotiated_rev > PD_REV20) + tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0); + +unlock: + mutex_unlock(&port->lock); +} + static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data) { struct tcpm_port *port = typec_get_drvdata(p); @@ -6093,6 +6147,14 @@ static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer) return HRTIMER_NORESTART; } +static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer) +{ + struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer); + + kthread_queue_work(port->wq, &port->send_discover_work); + return HRTIMER_NORESTART; +} + struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) { struct tcpm_port *port; @@ -6123,12 +6185,15 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc) kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work); kthread_init_work(&port->event_work, tcpm_pd_event_handler); kthread_init_work(&port->enable_frs, tcpm_enable_frs_work); + kthread_init_work(&port->send_discover_work, tcpm_send_discover_work); hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); port->state_machine_timer.function = state_machine_timer_handler; hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler; hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); port->enable_frs_timer.function = enable_frs_timer_handler; + hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + port->send_discover_timer.function = send_discover_timer_handler; spin_lock_init(&port->pd_event_lock);