From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 D54B0C432BE for ; Fri, 30 Jul 2021 15:55:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBF0160524 for ; Fri, 30 Jul 2021 15:55:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231636AbhG3P4B (ORCPT ); Fri, 30 Jul 2021 11:56:01 -0400 Received: from mga12.intel.com ([192.55.52.136]:43992 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231535AbhG3P4A (ORCPT ); Fri, 30 Jul 2021 11:56:00 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10061"; a="192718228" X-IronPort-AV: E=Sophos;i="5.84,282,1620716400"; d="scan'208";a="192718228" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jul 2021 08:55:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,282,1620716400"; d="scan'208";a="582142918" Received: from kuha.fi.intel.com ([10.237.72.162]) by fmsmga001.fm.intel.com with SMTP; 30 Jul 2021 08:55:30 -0700 Received: by kuha.fi.intel.com (sSMTP sendmail emulation); Fri, 30 Jul 2021 18:55:30 +0300 Date: Fri, 30 Jul 2021 18:55:30 +0300 From: Heikki Krogerus To: Kyle Tso Cc: linux@roeck-us.net, gregkh@linuxfoundation.org, robh+dt@kernel.org, badhri@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH v5 2/2] usb: typec: tcpm: Support non-PD mode Message-ID: References: <20210730124348.1986638-1-kyletso@google.com> <20210730124348.1986638-3-kyletso@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210730124348.1986638-3-kyletso@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fri, Jul 30, 2021 at 08:43:48PM +0800, Kyle Tso kirjoitti: > 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 is not supported, the device tree property > "typec-power-opmode" shall be added to specify the advertised Rp value > if the port supports SRC role. > > Signed-off-by: Kyle Tso > Reviewed-by: Guenter Roeck Acked-by: Heikki Krogerus > --- > Changes since v4: > - Added Reviewed-by > > drivers/usb/typec/tcpm/tcpm.c | 87 +++++++++++++++++++++++++++-------- > 1 file changed, 68 insertions(+), 19 deletions(-) > > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c > index 5b22a1c931a9..faea1bf9dce0 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; > > /* > @@ -815,6 +817,9 @@ 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 +3573,11 @@ 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 +3607,8 @@ 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 +3812,20 @@ 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 +3936,10 @@ 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 +4187,10 @@ 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 +4418,8 @@ 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 +5928,7 @@ 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 +5963,37 @@ 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; > + /* Get Source PDOs for the PD port or Source Rp value for the non-PD port */ > + if (port->pd_supported) { > + ret = fwnode_property_count_u32(fwnode, "source-pdos"); > + if (ret == 0) > + return -EINVAL; > + else if (ret < 0) > + return ret; > > - 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) > + return ret; > + ret = tcpm_validate_caps(port, port->src_pdo, port->nr_src_pdo); > + if (ret) > + return ret; > + } else { > + ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str); > + if (ret) > + return ret; > + ret = typec_find_pwr_opmode(opmode_str); > + if (ret < 0) > + return ret; > + port->src_rp = tcpm_pwr_opmode_to_rp(ret); > + } > > if (port->port_type == TYPEC_PORT_SRC) > return 0; > @@ -5961,6 +6007,11 @@ 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) > + return 0; > + > /* Get sink pdos */ > ret = fwnode_property_count_u32(fwnode, "sink-pdos"); > if (ret <= 0) > @@ -5977,9 +6028,7 @@ 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); > -- > 2.32.0.554.ge1b32706d8-goog -- heikki