From patchwork Thu Sep 17 10:18:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 11782187 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ABD8459D for ; Thu, 17 Sep 2020 10:22:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7AD0C2087D for ; Thu, 17 Sep 2020 10:22:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="dsLchTaK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726737AbgIQKWI (ORCPT ); Thu, 17 Sep 2020 06:22:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726648AbgIQKTy (ORCPT ); Thu, 17 Sep 2020 06:19:54 -0400 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0DABDC061220 for ; Thu, 17 Sep 2020 03:19:21 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id r8so1118757pgh.1 for ; Thu, 17 Sep 2020 03:19:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=rSelLwuthAAPkVKKgQOggAPjlAjJFhRrpVlRLEhgpkQ=; b=dsLchTaK8f1sFrPHXB+GhZQnVdLDUqIvh/GnHAm9AHDuFCi5tG5Qtr+z7BMqWoeBdX 4xBaoylerz06RpcPDBdxm5d5K/Y0rCwUB08U2bRxTMAL81gseH0pAjFHaR8Cr1VvQfQD /OnjrnF12o3IGY9+WQklpxvgJJUbGVWZNz4VtE1Thwzy+6WBuz3kZHmQM39zKQvXxXmY MYaABkdhEfX6FqMmCkGtyF1kX1D5syy9Dcxfqrf3iZ+cMQuo04QP8PCrPzI1yQAlcW0s ovimQSqkpX+/oyApf2SC6kEnT6VDr+udR3ICBEL0RMthCDQDulHazoFTyd0SefCA5FSL mJJQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=rSelLwuthAAPkVKKgQOggAPjlAjJFhRrpVlRLEhgpkQ=; b=GGBxkkE2rPnrpG9tGx6Wjxm3ww8rY6y+ZTmr3y2KW4XV3QgINh5QvdadBKUT7JoVBZ tMlmvMJ4ebL7HZE9IrpRxD86UpZrzpXuokSDolrOiwtonifNEVjHW2BIcqDnmSIR3/W0 satc2RKKZ9wPGGJ9HFcqvnaDKrGZ/ytw8opNq7Va2jMu4B4cVIEooe414UyT/vayO/54 7yz/KIfxguXjL2vdj9Df9sypP3lC4oqPPN9m7DKwuoyTjVJy34o888GNH9QxmON/hFqu dsR7QSLsoQn8wDcv3dF20RA8+l+dility3NV8cZsvh7fAlkwCC1QVWyJp404j8hZ/kpP PIfQ== X-Gm-Message-State: AOAM530/u0libwKppCAfy4B80cJeGfdm4i1JYbDgwJfU8d0cKBslniRa l4adZRIHQUchrdggrwuVMjtPz2NMkq8= X-Google-Smtp-Source: ABdhPJxeMIFzmJQ/SM9BVhk0fJSJAaU5fKHIlw4zaysv/qI9apU/x+dO7aIE9WrAE4jIujwy+dzZjF0cNTE= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:1:f292:1cff:fee0:66cf]) (user=badhri job=sendgmr) by 2002:a17:90a:c255:: with SMTP id d21mr8137282pjx.212.1600337960530; Thu, 17 Sep 2020 03:19:20 -0700 (PDT) Date: Thu, 17 Sep 2020 03:18:55 -0700 In-Reply-To: <20200917101856.3156869-1-badhri@google.com> Message-Id: <20200917101856.3156869-10-badhri@google.com> Mime-Version: 1.0 References: <20200917101856.3156869-1-badhri@google.com> X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog Subject: [PATCH v7 10/11] usb: typec: tcpci: Implement Auto discharge disconnect callbacks From: Badhri Jagan Sridharan To: Guenter Roeck , Heikki Krogerus , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Implement callbacks for enabling/disabling POWER_CONTROL.AutoDischargeDisconnect. TCPCI spec allows TCPC hardware to autonomously discharge the vbus capacitance upon disconnect. The expectation is that the TCPM enables AutoDischargeDisconnect while entering SNK/SRC_ATTACHED states. Hardware then automously discharges vbus when the vbus falls below a certain threshold i.e. VBUS_SINK_DISCONNECT_THRESHOLD. Apart from enabling the vbus discharge circuit, AutoDischargeDisconnect is also used a flag to move TCPCI based TCPC implementations into Attached.Snk/Attached.Src state as mentioned in Figure 4-15. TCPC State Diagram before a Connection of the USB Type-C Port Controller Interface Specification. In such TCPC implementations, setting AutoDischargeDisconnect would prevent TCPC into entering "Connection_Invalid" state as well. Signed-off-by: Badhri Jagan Sridharan --- Changes since v1: - Changing patch version to v6 to fix version number confusion. Changes since v6: - Rebase on usb-next. --- drivers/usb/typec/tcpm/tcpci.c | 33 +++++++++++++++++++++++++++++++++ drivers/usb/typec/tcpm/tcpci.h | 22 ++++++++++++++++++++-- 2 files changed, 53 insertions(+), 2 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index f9f0af64da5f..4ca64e8c8fe8 100644 --- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -268,6 +268,33 @@ static int tcpci_set_vconn(struct tcpc_dev *tcpc, bool enable) enable ? TCPC_POWER_CTRL_VCONN_ENABLE : 0); } +static int tcpci_enable_auto_vbus_discharge(struct tcpc_dev *dev, bool enable) +{ + struct tcpci *tcpci = tcpc_to_tcpci(dev); + int ret; + + ret = regmap_update_bits(tcpci->regmap, TCPC_POWER_CTRL, TCPC_POWER_CTRL_AUTO_DISCHARGE, + enable ? TCPC_POWER_CTRL_AUTO_DISCHARGE : 0); + return ret; +} + +static int tcpci_set_auto_vbus_discharge_threshold(struct tcpc_dev *dev, enum typec_role port_role, + enum typec_pwr_opmode mode, bool pps_active, + u32 requested_vbus_voltage) +{ + struct tcpci *tcpci = tcpc_to_tcpci(dev); + int (*set_auto_vbus_threshold)(struct tcpci *tcpci, struct tcpci_data *data, + enum typec_role port_role, enum typec_pwr_opmode mode, + bool pps_active, u32 requested_vbus_voltage); + + set_auto_vbus_threshold = tcpci->data->set_auto_vbus_discharge_threshold; + if (set_auto_vbus_threshold) + return set_auto_vbus_threshold(tcpci, tcpci->data, port_role, mode, pps_active, + requested_vbus_voltage); + + return 0; +} + static int tcpci_enable_frs(struct tcpc_dev *dev, bool enable) { struct tcpci *tcpci = tcpc_to_tcpci(dev); @@ -629,6 +656,12 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data) tcpci->tcpc.set_bist_data = tcpci_set_bist_data; tcpci->tcpc.enable_frs = tcpci_enable_frs; + if (tcpci->data->auto_discharge_disconnect) { + tcpci->tcpc.enable_auto_vbus_discharge = tcpci_enable_auto_vbus_discharge; + tcpci->tcpc.set_auto_vbus_discharge_threshold = + tcpci_set_auto_vbus_discharge_threshold; + } + err = tcpci_parse_config(tcpci); if (err < 0) return ERR_PTR(err); diff --git a/drivers/usb/typec/tcpm/tcpci.h b/drivers/usb/typec/tcpm/tcpci.h index 5ef07a56d67a..6a0aea34e544 100644 --- a/drivers/usb/typec/tcpm/tcpci.h +++ b/drivers/usb/typec/tcpm/tcpci.h @@ -8,6 +8,8 @@ #ifndef __LINUX_USB_TCPCI_H #define __LINUX_USB_TCPCI_H +#include + #define TCPC_VENDOR_ID 0x0 #define TCPC_PRODUCT_ID 0x2 #define TCPC_BCD_DEV 0x4 @@ -67,6 +69,7 @@ #define TCPC_POWER_CTRL 0x1c #define TCPC_POWER_CTRL_VCONN_ENABLE BIT(0) +#define TCPC_POWER_CTRL_AUTO_DISCHARGE BIT(4) #define TCPC_FAST_ROLE_SWAP_EN BIT(7) #define TCPC_CC_STATUS 0x1d @@ -133,6 +136,8 @@ #define TCPC_VBUS_VOLTAGE 0x70 #define TCPC_VBUS_SINK_DISCONNECT_THRESH 0x72 +#define TCPC_VBUS_SINK_DISCONNECT_THRESH_LSB 25 +#define TCPC_VBUS_SINK_DISCONNECT_THRESH_MAX 1023 #define TCPC_VBUS_STOP_DISCHARGE_THRESH 0x74 #define TCPC_VBUS_VOLTAGE_ALARM_HI_CFG 0x76 #define TCPC_VBUS_VOLTAGE_ALARM_LO_CFG 0x78 @@ -140,20 +145,33 @@ /* I2C_WRITE_BYTE_COUNT + 1 when TX_BUF_BYTE_x is only accessible I2C_WRITE_BYTE_COUNT */ #define TCPC_TRANSMIT_BUFFER_MAX_LEN 31 +struct tcpci; + /* - * @TX_BUF_BYTE_x_hidden + * @TX_BUF_BYTE_x_hidden: * optional; Set when TX_BUF_BYTE_x can only be accessed through I2C_WRITE_BYTE_COUNT. + * @auto_discharge_disconnect: + * Optional; Enables TCPC to autonously discharge vbus on disconnect. + * @set_auto_vbus_discharge_threshold: + * Mandatory when @auto_discharge_disconnect is sets. Allows + * programming the voltage threshold of vbus below which TCPC + * enables the vbus discharge circuit. */ -struct tcpci; struct tcpci_data { struct regmap *regmap; unsigned char TX_BUF_BYTE_x_hidden:1; + unsigned char auto_discharge_disconnect:1; + int (*init)(struct tcpci *tcpci, struct tcpci_data *data); int (*set_vconn)(struct tcpci *tcpci, struct tcpci_data *data, bool enable); int (*start_drp_toggling)(struct tcpci *tcpci, struct tcpci_data *data, enum typec_cc_status cc); int (*set_vbus)(struct tcpci *tcpci, struct tcpci_data *data, bool source, bool sink); + int (*set_auto_vbus_discharge_threshold)(struct tcpci *tcpci, struct tcpci_data *data, + enum typec_role port_role, + enum typec_pwr_opmode mode, bool pps_active, + u32 requested_vbus_voltage); }; struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data);