From patchwork Tue Sep 1 02:59:24 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: 297787 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=-12.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 B1C63C433E6 for ; Tue, 1 Sep 2020 03:00:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8DA39212CC for ; Tue, 1 Sep 2020 03:00:23 +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="ERD9V7gy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727804AbgIAC75 (ORCPT ); Mon, 31 Aug 2020 22:59:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51294 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727114AbgIAC7x (ORCPT ); Mon, 31 Aug 2020 22:59:53 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA0C9C061379 for ; Mon, 31 Aug 2020 19:59:52 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id g127so11430483ybf.11 for ; Mon, 31 Aug 2020 19:59:52 -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=VSpQ0YX3bKyUlkQKFI7ZHqKsrWBz5JA4kim0dUzXG7A=; b=ERD9V7gyga2yEuFuhqx4bi4TCRgcY15pnqAFbl9BppGXAcR11+fQDrlavIwKmQcPtQ 3TRDZ0nqLP8ejh53ug2pojdrWA50OJsFcLnkvEP8Pk60v69mr8Gk7q57NDReE49wKb75 nJakp6+I+NT1S6b4k8PhaaRX7Omvp8kPmWI5i1A2whMbAXd/8iPFC4HnHIeLLm2pi8Lg RgipkOxs1eV1IRPPgNY0BJG+cTQ/b++QzVDmybQrM2D+yFhxqXhr524DJxne7UkqgYg+ fBVuFf8h2HNg3fHplilbHrmlSP7KcHC6pM0dqHvS91vOYeUaBHWbkmZ/pA15oHWl9Rh/ 4R6w== 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=VSpQ0YX3bKyUlkQKFI7ZHqKsrWBz5JA4kim0dUzXG7A=; b=e9uWPmgELLZO+Nyk4se4zeS1nQkV7vNH31iKXWEzPn/2/gnllmYvHzZ9OgnE8nbj/Z fG4TS49jEyoE//i1L28254F3dO7FBqodi0DuLbHj72YSkwlscx3D+TZv9JdIaHiPCF4Z 5BStD833lRyB6s68elvaTi5k5dANEjvnQkT1s1kRgHjXaS7nYlxB/GaYm1Dp+u8KWzvk 6DAiWwMQsqYQb1DolYCRPHRE+GF7ll8Ll6ud5TmIu7Em1yQ+NNBipROCDcA2gj3FvrRu IA6h/BZsBz+Zdbicvhdty1TDVe28RiLpQ3IMRHtuXt1p1dUjbuVvI7BvmzATf54zmH5V SOag== X-Gm-Message-State: AOAM533U+PjdBLC1Yawo63A7B5NkNBhrklMxOeeWfUs7IR2Iw0q6I7Me WQdpBF8TwH0qTYdItkODbLULh6M0gOw= X-Google-Smtp-Source: ABdhPJwRQjxnSR1b09vQ3Gct5a9ZNZF9H0pSfv0XwIehdlhkRXi9tdNLg53YBRo73FJHXY8wodTAXJug3qk= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:1:f292:1cff:fee0:66cf]) (user=badhri job=sendgmr) by 2002:a25:f20c:: with SMTP id i12mr6913334ybe.406.1598929191912; Mon, 31 Aug 2020 19:59:51 -0700 (PDT) Date: Mon, 31 Aug 2020 19:59:24 -0700 In-Reply-To: <20200901025927.3596190-1-badhri@google.com> Message-Id: <20200901025927.3596190-12-badhri@google.com> Mime-Version: 1.0 References: <20200901025927.3596190-1-badhri@google.com> X-Mailer: git-send-email 2.28.0.402.g5ffc5be6b7-goog Subject: [PATCH v6 11/14] usb: typec: tcpci_maxim: Add support for Sink FRS 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 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Upon receiving ALERT_EXTENDED.TCPC_SINK_FAST_ROLE_SWAP signal tcpm to start Sink fast role swap signal. Inform when TCPM is sourcing vbus. Signed-off-by: Badhri Jagan Sridharan Reviewed-by: Heikki Krogerus --- Changes since v1: - Changing patch version to v6 to fix version number confusion. --- drivers/usb/typec/tcpm/tcpci_maxim.c | 50 +++++++++++++++++++++++++--- 1 file changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c index b61f290a8f96..6ba808ad901a 100644 --- a/drivers/usb/typec/tcpm/tcpci_maxim.c +++ b/drivers/usb/typec/tcpm/tcpci_maxim.c @@ -106,13 +106,22 @@ static void max_tcpci_init_regs(struct max_tcpci_chip *chip) return; } + ret = max_tcpci_write8(chip, TCPC_ALERT_EXTENDED, 0xff); + if (ret < 0) { + dev_err(chip->dev, "Unable to clear TCPC_ALERT_EXTENDED ret:%d\n", ret); + return; + } + alert_mask = TCPC_ALERT_TX_SUCCESS | TCPC_ALERT_TX_DISCARDED | TCPC_ALERT_TX_FAILED | TCPC_ALERT_RX_HARD_RST | TCPC_ALERT_RX_STATUS | TCPC_ALERT_CC_STATUS | - TCPC_ALERT_VBUS_DISCNCT | TCPC_ALERT_RX_BUF_OVF | TCPC_ALERT_POWER_STATUS; + TCPC_ALERT_VBUS_DISCNCT | TCPC_ALERT_RX_BUF_OVF | TCPC_ALERT_POWER_STATUS | + /* Enable Extended alert for detecting Fast Role Swap Signal */ + TCPC_ALERT_EXTND; ret = max_tcpci_write16(chip, TCPC_ALERT_MASK, alert_mask); if (ret < 0) { - dev_err(chip->dev, "Error writing to TCPC_ALERT_MASK ret:%d\n", ret); + dev_err(chip->dev, + "Error enabling TCPC_ALERT: TCPC_ALERT_MASK write failed ret:%d\n", ret); return; } @@ -122,6 +131,10 @@ static void max_tcpci_init_regs(struct max_tcpci_chip *chip) dev_err(chip->dev, "Error writing to TCPC_POWER_CTRL ret:%d\n", ret); return; } + + ret = max_tcpci_write8(chip, TCPC_ALERT_EXTENDED_MASK, TCPC_SINK_FAST_ROLE_SWAP); + if (ret < 0) + return; } static void process_rx(struct max_tcpci_chip *chip, u16 status) @@ -225,10 +238,23 @@ static void process_power_status(struct max_tcpci_chip *chip) if (ret < 0) return; - if (pwr_status == 0xff) + if (pwr_status == 0xff) { max_tcpci_init_regs(chip); - else + } else if (pwr_status & TCPC_POWER_STATUS_SOURCING_VBUS) { + tcpm_sourcing_vbus(chip->port); + /* + * Alawys re-enable boost here. + * In normal case, when say an headset is attached, TCPM would + * have instructed to TCPC to enable boost, so the call is a + * no-op. + * But for Fast Role Swap case, Boost turns on autonomously without + * AP intervention, but, needs AP to enable source mode explicitly + * for AP to regain control. + */ + max_tcpci_set_vbus(chip->tcpci, &chip->data, true, false); + } else { tcpm_vbus_change(chip->port); + } } static void process_tx(struct max_tcpci_chip *chip, u16 status) @@ -249,6 +275,7 @@ static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status) { u16 mask; int ret; + u8 reg_status; /* * Clear alert status for everything except RX_STATUS, which shouldn't @@ -274,6 +301,21 @@ static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status) } } + if (status & TCPC_ALERT_EXTND) { + ret = max_tcpci_read8(chip, TCPC_ALERT_EXTENDED, ®_status); + if (ret < 0) + return ret; + + ret = max_tcpci_write8(chip, TCPC_ALERT_EXTENDED, reg_status); + if (ret < 0) + return ret; + + if (reg_status & TCPC_SINK_FAST_ROLE_SWAP) { + dev_info(chip->dev, "FRS Signal"); + tcpm_sink_frs(chip->port); + } + } + if (status & TCPC_ALERT_RX_STATUS) process_rx(chip, status);