From patchwork Tue Apr 6 01:36:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 12183923 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 1966FC433ED for ; Tue, 6 Apr 2021 01:37:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EEAC8613E5 for ; Tue, 6 Apr 2021 01:37:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243178AbhDFBhH (ORCPT ); Mon, 5 Apr 2021 21:37:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44260 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243170AbhDFBhE (ORCPT ); Mon, 5 Apr 2021 21:37:04 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63613C061760 for ; Mon, 5 Apr 2021 18:36:57 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id v136so11624334qkb.9 for ; Mon, 05 Apr 2021 18:36:57 -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=ALL5Htp6jAs+nvh3roH8Xx42HhROLhDo8SEeejAKfRw=; b=fVxXxw/pM1t+6tibSpGb9W9kI5ZJtj65zZ90PEQBiqnX7CZu13V5ziy+qw0RNYOYq9 MCwqvpeFYdwJWc1zmxDt9/qvIhMEUuottlyvhFAc8Dtm2BLoGuwbBZm5hkIvCsHSd+BQ FCF4d0iXWv68gzMAAkUGU+jLkxfDOSxYeEMx+pa7rM92DeOYRjp2YVM8Oxt7WqHrdtXf OqDkvWg40qJhHw3wWbjq1+5Kwo1B9KcEUTuXwLy3IgTd820QUzSrDGZh6Ajp9C73fIcI uDnWmhg+iDVd7d2Mn+NLgOeDNsWfmiMA1TtjvK3UlauKlnxtvBtAxWNeaNOXaOgBG6Tc 6tXw== 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=ALL5Htp6jAs+nvh3roH8Xx42HhROLhDo8SEeejAKfRw=; b=ocXZOBy8Vu2I1EbOeagWab2E5KGEnhepZLMFHwYRtsLZq9wJLFHtdoWisxU09uRTJI h2DOV98icY1M4Gt1RYsjGLoWVsZY7lnwgfBvU5KSZC2YRrBgsda40d1wJD89Op+RdMXG zfRjK0vEvF7DuYdIR8bJFtFOpluhmaIUxW2yaloIOdVfgAWQtlEQu+DVlkmcoQtuBofS M9Gsyu1ZwHXhpPMlW2dnEWse6S7LQlAogw5V78E/pBsApB+HRhnwk95Np4ZKJlaqCoZ2 Ilv4FNdrmGenCMowJ62i2ir5SZnkEGxkGKLe/gJQMgYzL9vJoSV5QbLmlW2wuEhDDi7i 5+KA== X-Gm-Message-State: AOAM531UjzTOdokAlLGlGxQl1Cxrn5pOVeYClkl54uz0M6dV8cSRICLd yHQhsiKqJwE/lXRZU7DaRTKdvzzRVvQ= X-Google-Smtp-Source: ABdhPJwqVcdAP1CtFj6AUVV51+LXaaas1+VmYEK0l1Lf1x6yFR1/EgBQDgF8/5zffJmqbUSTFJ6OJthJosI= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:7080:32f9:cd15:6178]) (user=badhri job=sendgmr) by 2002:ad4:458d:: with SMTP id x13mr10356904qvu.62.1617673016618; Mon, 05 Apr 2021 18:36:56 -0700 (PDT) Date: Mon, 5 Apr 2021 18:36:41 -0700 In-Reply-To: <20210406013643.3280369-1-badhri@google.com> Message-Id: <20210406013643.3280369-5-badhri@google.com> Mime-Version: 1.0 References: <20210406013643.3280369-1-badhri@google.com> X-Mailer: git-send-email 2.31.0.208.g409f899ff0-goog Subject: [PATCH v1 4/6] usb: typec: tcpm: Honour pSnkStdby requirement during negotiation From: Badhri Jagan Sridharan To: Guenter Roeck , Heikki Krogerus , Greg Kroah-Hartman , Rob Herring , Adam Thomson Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Kyle Tso , Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From PD Spec: The Sink Shall transition to Sink Standby before a positive or negative voltage transition of VBUS. During Sink Standby the Sink Shall reduce its power draw to pSnkStdby. This allows the Source to manage the voltage transition as well as supply sufficient operating current to the Sink to maintain PD operation during the transition. The Sink Shall complete this transition to Sink Standby within tSnkStdby after evaluating the Accept Message from the Source. The transition when returning to Sink operation from Sink Standby Shall be completed within tSnkNewPower. The pSnkStdby requirement Shall only apply if the Sink power draw is higher than this level. The above requirement needs to be met to prevent hard resets from port partner. Without the patch: (5V/3A during SNK_DISCOVERY all the way through explicit contract) [ 95.711984] CC1: 0 -> 0, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected] [ 95.712007] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [ 95.712017] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS] [ 95.837190] VBUS on [ 95.882075] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms] [ 95.882082] state change SNK_DEBOUNCED -> SNK_ATTACHED [rev3 NONE_AMS] [ 95.882086] polarity 1 [ 95.883151] set_auto_vbus_discharge_threshold mode:0 pps_active:n vbus:5000 ret:0 [ 95.883441] enable vbus discharge ret:0 [ 95.883445] Requesting mux state 1, usb-role 2, orientation 2 [ 95.883776] state change SNK_ATTACHED -> SNK_STARTUP [rev3 NONE_AMS] [ 95.883879] pending state change SNK_STARTUP -> SNK_DISCOVERY @ 500 ms [rev3 NONE_AMS] [ 96.038960] VBUS on [ 96.383939] state change SNK_STARTUP -> SNK_DISCOVERY [delayed 500 ms] [ 96.383946] Setting voltage/current limit 5000 mV 3000 mA [ 96.383961] vbus=0 charge:=1 [ 96.386044] state change SNK_DISCOVERY -> SNK_WAIT_CAPABILITIES [rev3 NONE_AMS] [ 96.386309] pending state change SNK_WAIT_CAPABILITIES -> HARD_RESET_SEND @ 450 ms [rev3 NONE_AMS] [ 96.394404] PD RX, header: 0x2161 [1] [ 96.394408] PDO 0: type 0, 5000 mV, 3000 mA [E] [ 96.394410] PDO 1: type 0, 9000 mV, 2000 mA [] [ 96.394412] state change SNK_WAIT_CAPABILITIES -> SNK_NEGOTIATE_CAPABILITIES [rev2 POWER_NEGOTIATION] [ 96.394416] Setting usb_comm capable false [ 96.395083] cc=0 cc1=0 cc2=5 vbus=0 vconn=sink polarity=1 [ 96.395089] Requesting PDO 1: 9000 mV, 2000 mA [ 96.395093] PD TX, header: 0x1042 [ 96.397404] PD TX complete, status: 0 [ 96.397424] pending state change SNK_NEGOTIATE_CAPABILITIES -> HARD_RESET_SEND @ 60 ms [rev2 POWER_NEGOTIATION] [ 96.400826] PD RX, header: 0x363 [1] [ 96.400829] state change SNK_NEGOTIATE_CAPABILITIES -> SNK_TRANSITION_SINK [rev2 POWER_NEGOTIATION] [ 96.400832] pending state change SNK_TRANSITION_SINK -> HARD_RESET_SEND @ 500 ms [rev2 POWER_NEGOTIATION] [ 96.577315] PD RX, header: 0x566 [1] [ 96.577321] Setting voltage/current limit 9000 mV 2000 mA [ 96.578363] set_auto_vbus_discharge_threshold mode:3 pps_active:n vbus:9000 ret:0 [ 96.578370] state change SNK_TRANSITION_SINK -> SNK_READY [rev2 POWER_NEGOTIATION] With the patch: [ 168.398573] CC1: 0 -> 0, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected] [ 168.398605] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [ 168.398619] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS] [ 168.522348] VBUS on [ 168.568676] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms] [ 168.568684] state change SNK_DEBOUNCED -> SNK_ATTACHED [rev3 NONE_AMS] [ 168.568688] polarity 1 [ 168.569867] set_auto_vbus_discharge_threshold mode:0 pps_active:n vbus:5000 ret:0 [ 168.570158] enable vbus discharge ret:0 [ 168.570161] Requesting mux state 1, usb-role 2, orientation 2 [ 168.570504] state change SNK_ATTACHED -> SNK_STARTUP [rev3 NONE_AMS] [ 168.570634] pending state change SNK_STARTUP -> SNK_DISCOVERY @ 500 ms [rev3 NONE_AMS] [ 169.070689] state change SNK_STARTUP -> SNK_DISCOVERY [delayed 500 ms] [ 169.070695] Setting voltage/current limit 5000 mV 3000 mA [ 169.070702] vbus=0 charge:=1 [ 169.072719] state change SNK_DISCOVERY -> SNK_WAIT_CAPABILITIES [rev3 NONE_AMS] [ 169.073145] pending state change SNK_WAIT_CAPABILITIES -> HARD_RESET_SEND @ 450 ms [rev3 NONE_AMS] [ 169.077162] PD RX, header: 0x2161 [1] [ 169.077172] PDO 0: type 0, 5000 mV, 3000 mA [E] [ 169.077178] PDO 1: type 0, 9000 mV, 2000 mA [] [ 169.077183] state change SNK_WAIT_CAPABILITIES -> SNK_NEGOTIATE_CAPABILITIES [rev2 POWER_NEGOTIATION] [ 169.077191] Setting usb_comm capable false [ 169.077753] cc=0 cc1=0 cc2=5 vbus=0 vconn=sink polarity=1 [ 169.077759] Requesting PDO 1: 9000 mV, 2000 mA [ 169.077762] PD TX, header: 0x1042 [ 169.079990] PD TX complete, status: 0 [ 169.080013] pending state change SNK_NEGOTIATE_CAPABILITIES -> HARD_RESET_SEND @ 60 ms [rev2 POWER_NEGOTIATION] [ 169.083183] VBUS on [ 169.084195] PD RX, header: 0x363 [1] [ 169.084200] state change SNK_NEGOTIATE_CAPABILITIES -> SNK_TRANSITION_SINK [rev2 POWER_NEGOTIATION] [ 169.084206] Setting standby current 5000 mV @ 500 mA [ 169.084209] Setting voltage/current limit 5000 mV 500 mA [ 169.084220] pending state change SNK_TRANSITION_SINK -> HARD_RESET_SEND @ 500 ms [rev2 POWER_NEGOTIATION] [ 169.260222] PD RX, header: 0x566 [1] [ 169.260227] Setting voltage/current limit 9000 mV 2000 mA [ 169.261315] set_auto_vbus_discharge_threshold mode:3 pps_active:n vbus:9000 ret:0 [ 169.261321] state change SNK_TRANSITION_SINK -> SNK_READY [rev2 POWER_NEGOTIATION] [ 169.261570] AMS POWER_NEGOTIATION finished Fixes: f0690a25a140b ("staging: typec: USB Type-C Port Manager (tcpm)") Signed-off-by: Badhri Jagan Sridharan --- drivers/usb/typec/tcpm/tcpm.c | 17 +++++++++++++++++ include/linux/usb/pd.h | 2 ++ 2 files changed, 19 insertions(+) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 7708b01009cb..de9e57a7a929 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -4127,6 +4127,23 @@ static void run_state_machine(struct tcpm_port *port) } break; case SNK_TRANSITION_SINK: + /* From the USB PD spec: + * "The Sink Shall transition to Sink Standby before a positive or + * negative voltage transition of VBUS. During Sink Standby + * the Sink Shall reduce its power draw to pSnkStdby." + * + * This is not applicable to PPS though as the port can continue + * to draw negotiated power without switching to standby. + */ + if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active && + port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) { + u32 stdby_ma = port->supply_voltage ? PD_P_SNK_STDBY_MW * 1000 / + port->supply_voltage : 0; + tcpm_log(port, "Setting standby current %u mV @ %u mA", + port->supply_voltage, stdby_ma); + tcpm_set_current_limit(port, stdby_ma, port->supply_voltage); + } + fallthrough; case SNK_TRANSITION_SINK_VBUS: tcpm_set_state(port, hard_reset_state(port), PD_T_PS_TRANSITION); diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h index 70d681918d01..bf00259493e0 100644 --- a/include/linux/usb/pd.h +++ b/include/linux/usb/pd.h @@ -493,4 +493,6 @@ static inline unsigned int rdo_max_power(u32 rdo) #define PD_N_CAPS_COUNT (PD_T_NO_RESPONSE / PD_T_SEND_SOURCE_CAP) #define PD_N_HARD_RESET_COUNT 2 +#define PD_P_SNK_STDBY_MW 2500 /* 2500 mW */ + #endif /* __LINUX_USB_PD_H */