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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 B83FCC43603 for ; Mon, 9 Dec 2019 21:44:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7F3732071E for ; Mon, 9 Dec 2019 21:44:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Nx8lgnaX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726970AbfLIVoE (ORCPT ); Mon, 9 Dec 2019 16:44:04 -0500 Received: from mail-wm1-f65.google.com ([209.85.128.65]:52838 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726678AbfLIVoE (ORCPT ); Mon, 9 Dec 2019 16:44:04 -0500 Received: by mail-wm1-f65.google.com with SMTP id p9so965052wmc.2; Mon, 09 Dec 2019 13:44:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=+hMwPgRaMykXSn7DE5c3kA8l5sH3/EjUvphsNHwNa6U=; b=Nx8lgnaXYR7FRbTet4K3Hj2WqOXWSVkfBrJjNrwWpn8cC7LaRECvSR7ZrGYBi0L3S9 kqaDJMcGzp+g1OzOSExum3gbiSGIcFyC6X8WKYlS6kOVOp5jnUqTyTS9krfb8zon0sYv kqtZKfqXIbxBjXIQSaGQOyJLm214gN9wy4L0WJl6iwBxdkaimrHCKaz6pidt+pEWHpIz 0u8Z1FFQ2NtfR3bAvq51emkBCVMUOOS51+x57dQlDtDiQQChfUDY+kj9i/5zEYhCE8WD 9EpRQiR2SDue+kaOhCpZws6exbvVrxbXxAhDMNu622oYmTgpjRKgu8OPT1SZN0ITK1Kh b7EA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=+hMwPgRaMykXSn7DE5c3kA8l5sH3/EjUvphsNHwNa6U=; b=ePsJGIP0zwNf9PbuhnwqzXP238m9iyZC33bKstN7pAg9FX/vRnPTN27SpPAnny+k7X ukrB666tjaJqrQYq09PTl3WdbdyR3l8tcU4i6cGcAyKjM2lKohfx2H2uWMC3NaWAWXCG jvtTou7GT04G+Ko0Dscf3N7WCC8BDMNq440GTWDJ/MEo6ClL6I/eKDvLbpbfVpJeOYaK Qc8onifn/2dTJjr1IrndKlQ/AjCeodKrMZn9cmLZwa2hxP7OzVyQnxwOjBG2oKF28tdC 8toQAeTUdDvkYkxNh5AvYRqMxlYk3ZpLB3Wr3t43YNRotGmbrhZ7YePN9zXQOsRapI1u 1yBA== X-Gm-Message-State: APjAAAWJOBsmqdIYkrNTA5TRb7qFcqNsiBfuTuRDCZc5XtrZRHxLY7H/ VkyDYyHE/BYxn1Dgf1L1RhVoAOer0FU= X-Google-Smtp-Source: APXvYqwVgdmKP4zjXl7W+Isfc6jiClMbcA8AkXLfQglyPTqlDIuV/4Sa3XG43cxb1dDdL59/n1zd3Q== X-Received: by 2002:a7b:ca4b:: with SMTP id m11mr1192590wml.74.1575927841659; Mon, 09 Dec 2019 13:44:01 -0800 (PST) Received: from stbsrv-and-01.and.broadcom.net ([192.19.231.250]) by smtp.gmail.com with ESMTPSA id z6sm757714wmz.12.2019.12.09.13.43.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Dec 2019 13:44:00 -0800 (PST) From: Al Cooper To: linux-kernel@vger.kernel.org Cc: Al Cooper , bcm-kernel-feedback-list@broadcom.com, devicetree@vger.kernel.org, Florian Fainelli , Kishon Vijay Abraham I , linux-arm-kernel@lists.infradead.org, Mark Rutland , Rob Herring , Srinath Mannam Subject: [PATCH v2 resend 04/13] phy: usb: Add "wake on" functionality Date: Mon, 9 Dec 2019 16:42:40 -0500 Message-Id: <20191209214249.41137-5-alcooperx@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191209214249.41137-1-alcooperx@gmail.com> References: <20191209214249.41137-1-alcooperx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add the ability to handle USB wake events from USB devices when in S2 mode. Typically there is some additional configuration needed to tell the USB device to generate the wake event when suspended but this varies with the different USB device classes. For example, on USB Ethernet dongles, ethtool should be used to enable the magic packet wake functionality in the dongle. NOTE: This requires that the "power/wakeup" sysfs entry for the USB device generating the wakeup be set to "enabled". This functionality requires a special hardware sideband path that will trigger the AON_PM_L2 interrupt needed to wake the system from S2 even though the USB host controllers are in IDDQ (low power state) and most USB related clocks are shut off. For the sideband signaling to work we need to leave the usbx_freerun clock running, but this clock consumes very little power by design. There's a bug in the XHCI wake hardware so only EHCI/OHCI wake is currently supported. Signed-off-by: Al Cooper --- drivers/phy/broadcom/phy-brcm-usb-init.c | 17 +++++++++ drivers/phy/broadcom/phy-brcm-usb-init.h | 1 + drivers/phy/broadcom/phy-brcm-usb.c | 48 ++++++++++++++++++++++-- 3 files changed, 63 insertions(+), 3 deletions(-) diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.c b/drivers/phy/broadcom/phy-brcm-usb-init.c index 0e6b921072be..6ad5978ded9b 100644 --- a/drivers/phy/broadcom/phy-brcm-usb-init.c +++ b/drivers/phy/broadcom/phy-brcm-usb-init.c @@ -58,6 +58,8 @@ #define USB_CTRL_USB_PM_SOFT_RESET_MASK 0x40000000 /* option */ #define USB_CTRL_USB_PM_USB20_HC_RESETB_MASK 0x30000000 /* option */ #define USB_CTRL_USB_PM_USB20_HC_RESETB_VAR_MASK 0x00300000 /* option */ +#define USB_CTRL_USB_PM_RMTWKUP_EN_MASK 0x00000001 +#define USB_CTRL_USB_PM_STATUS 0x38 #define USB_CTRL_USB30_CTL1 0x60 #define USB_CTRL_USB30_CTL1_PHY3_PLL_SEQ_START_MASK 0x00000010 #define USB_CTRL_USB30_CTL1_PHY3_RESETB_MASK 0x00010000 @@ -855,6 +857,10 @@ void brcm_usb_init_common(struct brcm_usb_init_params *params) u32 reg; void __iomem *ctrl = params->ctrl_regs; + /* Clear any pending wake conditions */ + reg = brcmusb_readl(USB_CTRL_REG(ctrl, USB_PM_STATUS)); + brcmusb_writel(reg, USB_CTRL_REG(ctrl, USB_PM_STATUS)); + /* Take USB out of power down */ if (USB_CTRL_MASK_FAMILY(params, PLL_CTL, PLL_IDDQ_PWRDN)) { USB_CTRL_UNSET_FAMILY(params, PLL_CTL, PLL_IDDQ_PWRDN); @@ -1010,6 +1016,17 @@ void brcm_usb_uninit_xhci(struct brcm_usb_init_params *params) USB_CTRL_SET(params->ctrl_regs, USB30_PCTL, PHY3_IDDQ_OVERRIDE); } +void brcm_usb_wake_enable(struct brcm_usb_init_params *params, + int enable) +{ + void __iomem *ctrl = params->ctrl_regs; + + if (enable) + USB_CTRL_SET(ctrl, USB_PM, RMTWKUP_EN); + else + USB_CTRL_UNSET(ctrl, USB_PM, RMTWKUP_EN); +} + void brcm_usb_set_family_map(struct brcm_usb_init_params *params) { int fam; diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.h b/drivers/phy/broadcom/phy-brcm-usb-init.h index f4f4f6d5d258..f473e0c51f0b 100644 --- a/drivers/phy/broadcom/phy-brcm-usb-init.h +++ b/drivers/phy/broadcom/phy-brcm-usb-init.h @@ -38,5 +38,6 @@ void brcm_usb_init_xhci(struct brcm_usb_init_params *ini); void brcm_usb_uninit_common(struct brcm_usb_init_params *ini); void brcm_usb_uninit_eohci(struct brcm_usb_init_params *ini); void brcm_usb_uninit_xhci(struct brcm_usb_init_params *ini); +void brcm_usb_wake_enable(struct brcm_usb_init_params *params, int enable); #endif /* _USB_BRCM_COMMON_INIT_H */ diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c index 634afc803778..cca04d60f2d2 100644 --- a/drivers/phy/broadcom/phy-brcm-usb.c +++ b/drivers/phy/broadcom/phy-brcm-usb.c @@ -57,11 +57,22 @@ struct brcm_usb_phy_data { bool has_xhci; struct clk *usb_20_clk; struct clk *usb_30_clk; + struct clk *suspend_clk; struct mutex mutex; /* serialize phy init */ int init_count; + int wake_irq; struct brcm_usb_phy phys[BRCM_USB_PHY_ID_MAX]; }; +static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id) +{ + struct phy *gphy = dev_id; + + pm_wakeup_event(&gphy->dev, 0); + + return IRQ_HANDLED; +} + static int brcm_usb_phy_init(struct phy *gphy) { struct brcm_usb_phy *phy = phy_get_drvdata(gphy); @@ -76,6 +87,7 @@ static int brcm_usb_phy_init(struct phy *gphy) if (priv->init_count++ == 0) { clk_prepare_enable(priv->usb_20_clk); clk_prepare_enable(priv->usb_30_clk); + clk_prepare_enable(priv->suspend_clk); brcm_usb_init_common(&priv->ini); } mutex_unlock(&priv->mutex); @@ -108,6 +120,7 @@ static int brcm_usb_phy_exit(struct phy *gphy) brcm_usb_uninit_common(&priv->ini); clk_disable_unprepare(priv->usb_20_clk); clk_disable_unprepare(priv->usb_30_clk); + clk_disable_unprepare(priv->suspend_clk); } mutex_unlock(&priv->mutex); phy->inited = false; @@ -228,11 +241,12 @@ static const struct attribute_group brcm_usb_phy_group = { .attrs = brcm_usb_phy_attrs, }; -static int brcm_usb_phy_dvr_init(struct device *dev, +static int brcm_usb_phy_dvr_init(struct platform_device *pdev, struct brcm_usb_phy_data *priv, struct device_node *dn) { - struct phy *gphy; + struct device *dev = &pdev->dev; + struct phy *gphy = NULL; int err; priv->usb_20_clk = of_clk_get_by_name(dn, "sw_usb"); @@ -275,6 +289,28 @@ static int brcm_usb_phy_dvr_init(struct device *dev, if (err) return err; } + + priv->suspend_clk = clk_get(dev, "usb0_freerun"); + if (IS_ERR(priv->suspend_clk)) { + dev_err(dev, "Suspend Clock not found in Device Tree\n"); + priv->suspend_clk = NULL; + } + + priv->wake_irq = platform_get_irq_byname(pdev, "wake"); + if (priv->wake_irq < 0) + priv->wake_irq = platform_get_irq_byname(pdev, "wakeup"); + if (priv->wake_irq >= 0) { + err = devm_request_irq(dev, priv->wake_irq, + brcm_usb_phy_wake_isr, 0, + dev_name(dev), gphy); + if (err < 0) + return err; + device_set_wakeup_capable(dev, 1); + } else { + dev_info(dev, + "Wake interrupt missing, system wake not supported\n"); + } + return 0; } @@ -335,7 +371,7 @@ static int brcm_usb_phy_probe(struct platform_device *pdev) if (of_property_read_bool(dn, "brcm,has-eohci")) priv->has_eohci = true; - err = brcm_usb_phy_dvr_init(dev, priv, dn); + err = brcm_usb_phy_dvr_init(pdev, priv, dn); if (err) return err; @@ -386,10 +422,13 @@ static int brcm_usb_phy_suspend(struct device *dev) if (priv->phys[BRCM_USB_PHY_2_0].inited) brcm_usb_uninit_eohci(&priv->ini); brcm_usb_uninit_common(&priv->ini); + brcm_usb_wake_enable(&priv->ini, true); if (priv->phys[BRCM_USB_PHY_3_0].inited) clk_disable_unprepare(priv->usb_30_clk); if (priv->phys[BRCM_USB_PHY_2_0].inited) clk_disable_unprepare(priv->usb_20_clk); + if (priv->wake_irq >= 0) + enable_irq_wake(priv->wake_irq); } return 0; } @@ -400,6 +439,7 @@ static int brcm_usb_phy_resume(struct device *dev) clk_prepare_enable(priv->usb_20_clk); clk_prepare_enable(priv->usb_30_clk); + brcm_usb_wake_enable(&priv->ini, false); brcm_usb_init_ipp(&priv->ini); /* @@ -407,6 +447,8 @@ static int brcm_usb_phy_resume(struct device *dev) * Uninitialize anything that wasn't previously initialized. */ if (priv->init_count) { + if (priv->wake_irq >= 0) + disable_irq_wake(priv->wake_irq); brcm_usb_init_common(&priv->ini); if (priv->phys[BRCM_USB_PHY_2_0].inited) { brcm_usb_init_eohci(&priv->ini); -- 2.17.1