From patchwork Wed Jul 28 09:29:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kyle Tso X-Patchwork-Id: 488349 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, USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 40971C432BE for ; Wed, 28 Jul 2021 09:29:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28BE760FE5 for ; Wed, 28 Jul 2021 09:29:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235602AbhG1J3w (ORCPT ); Wed, 28 Jul 2021 05:29:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235593AbhG1J3v (ORCPT ); Wed, 28 Jul 2021 05:29:51 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D3CBC061757 for ; Wed, 28 Jul 2021 02:29:50 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id e145-20020a2550970000b029056eb288352cso2193275ybb.2 for ; Wed, 28 Jul 2021 02:29:50 -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=l5yKvXjQ8S/W0y/XNebRWWjDHarzrh79K/doATDwMR4=; b=gaMN5SEfV1eft1jbLB9r/qJanlNFIo4DqD83bYWIuUcEpfIExks4K/XTkvDafm/12F DjGwHLkeBH7+FwAZn69m7x9Ga2VKb/OE4Xn4J3th0qmpfavxvM5CjdUwqzSN915XqF1q eKh/vakSQauLQJRHaZUFQq0eJr4p9i+oe7M1L5A/62UtVQTBJDLhwLf1HhQFCKVxUIS/ 9kVEWaTugdQQ38zOGFL5BPWcMuSnWx4Gsyz6tYHB5/9usSMIoTTaC8siLQtJHZSmvoOH QseCcFbWhmdqWAwDSNQDK3aNiGb3gPfsNoZyth27GEDAzbB55WNTs7rCBKV3eD9AfZw0 8UAw== 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=l5yKvXjQ8S/W0y/XNebRWWjDHarzrh79K/doATDwMR4=; b=lxo7gNyb+KN6P7e2eDW3EWkMuBcyRBuOgL+ZPE69JuJs1gt0jvM/L+llzy2geXw8vX IU29YHn4lbRao6NcKvFL3LinOweq+UnoVWoHhYw7njyGSxQpeChW+nC8YMK82dZIiI5v tU5wsV9RaI7kRgcJttmoJVaFmqXR2mihdOu9mHRT/DyyPQK22ixwnGK8fNYGyVcE0KI/ c4lzKKMwHTPv+hBLpTdna0kN5MuaK2+V+duGZXY9xOlgUbFcl/WbpsNJpGZ9Xze9/Iti myh7xnqEMelW1M7YcWuMApstMSQFWTBIMMqToVDP6B5bPKSh9heayaQitCoCI7hXFrVR KH7Q== X-Gm-Message-State: AOAM532+vVv8zOfeyTohSUYwDYoFdqLZ2CTlNiWtChmCdhMJS/p/Lcjz iQ0gX5s/FumeJgln/huFoThFwGsgiBOS X-Google-Smtp-Source: ABdhPJwM2k70JZA/Cyd8J9ASauzN+CGEocnhvVzX5dwnGVbFWBTZX8W43wmvT1BarCWfiyhSCx7ObvzHRWTX X-Received: from kyletso.ntc.corp.google.com ([2401:fa00:fc:202:da7f:a21b:ee74:66a2]) (user=kyletso job=sendgmr) by 2002:a25:ca88:: with SMTP id a130mr38241072ybg.4.1627464589705; Wed, 28 Jul 2021 02:29:49 -0700 (PDT) Date: Wed, 28 Jul 2021 17:29:30 +0800 In-Reply-To: <20210728092930.2552619-1-kyletso@google.com> Message-Id: <20210728092930.2552619-3-kyletso@google.com> Mime-Version: 1.0 References: <20210728092930.2552619-1-kyletso@google.com> X-Mailer: git-send-email 2.32.0.432.gabb21c7263-goog Subject: [PATCH v3 2/2] usb: typec: tcpm: Support non-PD mode From: Kyle Tso To: linux@roeck-us.net, heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org, robh+dt@kernel.org Cc: badhri@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Kyle Tso Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Even if the Type-C controller supports PD, it is doable to disable PD capabilities with the current state machine in TCPM. Without enabling RX in low-level drivers and with skipping the power negotiation, the port is eligible to be a non-PD Type-C port. Use new flags whose values are populated from the device tree to decide the port PD capability. Adding "pd-unsupported" property in device tree indicates that the port does not support PD. If "pd-unsupported" is not found, "typec-power-opmode" shall be added to specify the advertised Rp value if the port supports SRC role. Signed-off-by: Kyle Tso --- changes since v2: - Changed the control flow if the port is SNK or DRP. Return directly if the flag is false (PD not supported). Read "self-powered" before that. drivers/usb/typec/tcpm/tcpm.c | 88 ++++++++++++++++++++++++++++------- 1 file changed, 70 insertions(+), 18 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 5b22a1c931a9..d8d6ef8c6282 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -316,6 +316,7 @@ struct tcpm_port { struct typec_partner *partner; enum typec_cc_status cc_req; + enum typec_cc_status src_rp; /* work only if pd_supported == false */ enum typec_cc_status cc1; enum typec_cc_status cc2; @@ -323,6 +324,7 @@ struct tcpm_port { bool attached; bool connected; + bool pd_supported; enum typec_port_type port_type; /* @@ -804,6 +806,7 @@ static void tcpm_apply_rc(struct tcpm_port *port) } } + /* * Determine RP value to set based on maximum current supported * by a port if configured as source. @@ -815,6 +818,9 @@ static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port) int nr_pdo = port->nr_src_pdo; int i; + if (!port->pd_supported) + return port->src_rp; + /* * Search for first entry with matching voltage. * It should report the maximum supported current. @@ -3568,9 +3574,11 @@ static int tcpm_src_attach(struct tcpm_port *port) if (ret < 0) return ret; - ret = port->tcpc->set_pd_rx(port->tcpc, true); - if (ret < 0) - goto out_disable_mux; + if (port->pd_supported) { + ret = port->tcpc->set_pd_rx(port->tcpc, true); + if (ret < 0) + goto out_disable_mux; + } /* * USB Type-C specification, version 1.2, @@ -3600,7 +3608,8 @@ static int tcpm_src_attach(struct tcpm_port *port) out_disable_vconn: tcpm_set_vconn(port, false); out_disable_pd: - port->tcpc->set_pd_rx(port->tcpc, false); + if (port->pd_supported) + port->tcpc->set_pd_rx(port->tcpc, false); out_disable_mux: tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE, TYPEC_ORIENTATION_NONE); @@ -3804,6 +3813,20 @@ static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc) } } +static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode) +{ + switch (opmode) { + case TYPEC_PWR_MODE_USB: + return TYPEC_CC_RP_DEF; + case TYPEC_PWR_MODE_1_5A: + return TYPEC_CC_RP_1_5; + case TYPEC_PWR_MODE_3_0A: + case TYPEC_PWR_MODE_PD: + default: + return TYPEC_CC_RP_3_0; + } +} + static void run_state_machine(struct tcpm_port *port) { int ret; @@ -3914,6 +3937,10 @@ static void run_state_machine(struct tcpm_port *port) if (port->ams == POWER_ROLE_SWAP || port->ams == FAST_ROLE_SWAP) tcpm_ams_finish(port); + if (!port->pd_supported) { + tcpm_set_state(port, SRC_READY, 0); + break; + } port->upcoming_state = SRC_SEND_CAPABILITIES; tcpm_ams_start(port, POWER_NEGOTIATION); break; @@ -4161,7 +4188,10 @@ static void run_state_machine(struct tcpm_port *port) current_lim = PD_P_SNK_STDBY_MW / 5; tcpm_set_current_limit(port, current_lim, 5000); tcpm_set_charge(port, true); - tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); + if (!port->pd_supported) + tcpm_set_state(port, SNK_READY, 0); + else + tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0); break; } /* @@ -4389,7 +4419,8 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_vbus(port, true); if (port->ams == HARD_RESET) tcpm_ams_finish(port); - port->tcpc->set_pd_rx(port->tcpc, true); + if (port->pd_supported) + port->tcpc->set_pd_rx(port->tcpc, true); tcpm_set_attached_state(port, true); tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON); break; @@ -5898,6 +5929,7 @@ EXPORT_SYMBOL_GPL(tcpm_tcpc_reset); static int tcpm_fw_get_caps(struct tcpm_port *port, struct fwnode_handle *fwnode) { + const char *opmode_str; const char *cap_str; int ret; u32 mw, frs_current; @@ -5932,22 +5964,37 @@ static int tcpm_fw_get_caps(struct tcpm_port *port, return ret; port->typec_caps.type = ret; port->port_type = port->typec_caps.type; + port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-unsupported"); port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop"); + if (port->port_type == TYPEC_PORT_SNK) goto sink; /* Get source pdos */ - ret = fwnode_property_count_u32(fwnode, "source-pdos"); - if (ret <= 0) - return -EINVAL; + if (port->pd_supported) { + ret = fwnode_property_count_u32(fwnode, "source-pdos"); + if (ret <= 0) + return -EINVAL; - port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS); - ret = fwnode_property_read_u32_array(fwnode, "source-pdos", - port->src_pdo, port->nr_src_pdo); - if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo, - port->nr_src_pdo)) - return -EINVAL; + port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS); + ret = fwnode_property_read_u32_array(fwnode, "source-pdos", + port->src_pdo, port->nr_src_pdo); + if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo, + port->nr_src_pdo)) + return -EINVAL; + } else { + port->nr_src_pdo = 0; + ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str); + if (ret == 0) { + ret = typec_find_pwr_opmode(opmode_str); + if (ret < 0) + return ret; + port->src_rp = tcpm_pwr_opmode_to_rp(ret); + } else { + return ret; + } + } if (port->port_type == TYPEC_PORT_SRC) return 0; @@ -5961,6 +6008,13 @@ static int tcpm_fw_get_caps(struct tcpm_port *port, if (port->typec_caps.prefer_role < 0) return -EINVAL; sink: + port->self_powered = fwnode_property_read_bool(fwnode, "self-powered"); + + if (!port->pd_supported) { + port->nr_snk_pdo = 0; + return 0; + } + /* Get sink pdos */ ret = fwnode_property_count_u32(fwnode, "sink-pdos"); if (ret <= 0) @@ -5977,9 +6031,7 @@ static int tcpm_fw_get_caps(struct tcpm_port *port, return -EINVAL; port->operating_snk_mw = mw / 1000; - port->self_powered = fwnode_property_read_bool(fwnode, "self-powered"); - - /* FRS can only be supported byb DRP ports */ + /* FRS can only be supported by DRP ports */ if (port->port_type == TYPEC_PORT_DRP) { ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current", &frs_current);