From patchwork Fri Nov 22 13:57:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roger Quadros X-Patchwork-Id: 13883199 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C8F89BA20; Fri, 22 Nov 2024 13:57:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732283857; cv=none; b=DSsEHjc+j8g9Xm7zoL+4ZlxYmPEbr6SvONX1HCEixWvsjN3bYNu7CQjv4Y+7RMZ4w/o1dvEjmW1nKUZfmLYgFkrsJda1xUd1W1WhEPel1AMdvfTboJzB3vpxM3JRgKuAtM3RT74D1V2kYdLla7hq1RWSraw7PE4FHKobxbuTIKc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732283857; c=relaxed/simple; bh=d7kw5ktReFj4yWWGLaWBCguRiCMPqtIMkHdyyZNbx1k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=tUcpydFQmDssUs1m0D7xm8f0B4I7clyS09zuDt3AYo++QyS9O34Gq8KGQe9NbUnevub/5FIDo+8M6lYD6rizyM6G4wn/fkxT8+1GOVU7h8PmY6KPApuhPNbOv9oFvraaifBDa7PFxw9YLSoiAi0HF6JQs70LzmldVhR8p9UJ/JE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jsedbVrb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jsedbVrb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AABE7C4CECF; Fri, 22 Nov 2024 13:57:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732283857; bh=d7kw5ktReFj4yWWGLaWBCguRiCMPqtIMkHdyyZNbx1k=; h=From:Date:Subject:To:Cc:From; b=jsedbVrbtL9x//s30pVbM0Zlq6hwTFww1uLBxd4dbdNZZZbFC5rCkWauyhuM7dig0 p11T9ESDM6DP50/pEdtPmApBoNRnL8f9MmGPVojslMPi0ctTdW/8vkoQcxClUbDH8q GWancxR3zJVq08sBDu1VN9DByUXr3SZLDYVTKx+ueSSdw0y36TE5ET3oc0NrB+BxM8 jQNLmxBSW28DQ3Xqg2Jel67UlyQkZV4X6rkZ0ihNTm8R97T3xds/ibx3hYIUB2twV+ ddj7uRrEuCQUK4cBcsF2VMBt/MlOjzQGlh+zk+39Pc2f5QcHWPg+mLAwIP+9/q6oIl 8Q17WND/3oX4Q== From: Roger Quadros Date: Fri, 22 Nov 2024 15:57:26 +0200 Subject: [PATCH] usb: dwc3: dwc3-am62: Re-initialize controller if lost power in PM suspend Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241122-am62-dwc3-io-ddr-v1-1-cc4956449420@kernel.org> X-B4-Tracking: v=1; b=H4sIAMWNQGcC/x3MPQqAMAxA4atIZgNtKqJeRRz6EzWDVVpQQby7x fEb3nsgcxLOMFQPJD4lyx4LdF2BX21cGCUUAylqtCZCu7WE4fIGZccQEhrnXdsZ22uroGRH4ln ufzlO7/sBP1rRoWIAAAA= To: Thinh Nguyen , Greg Kroah-Hartman Cc: Siddharth Vadapalli , srk@ti.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Roger Quadros X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=5191; i=rogerq@kernel.org; h=from:subject:message-id; bh=d7kw5ktReFj4yWWGLaWBCguRiCMPqtIMkHdyyZNbx1k=; b=owEBbQKS/ZANAwAIAdJaa9O+djCTAcsmYgBnQI3MRr6qWu6GVIYKlp87kEv5Q14fQ6K9wyhWa FL76JL409OJAjMEAAEIAB0WIQRBIWXUTJ9SeA+rEFjSWmvTvnYwkwUCZ0CNzAAKCRDSWmvTvnYw k0xrD/4uWs5BBkfPo8CztYD4V+ZAS3uIBSL/lbxznMwFfzKFE06hab+kVLdAvWUGtmacWxfIolq bqKJz81SSAe7jjJmo27abEZop/9HbMP8XTTiIeNfBUuBs0VApdqjDGpwMA6aP9DSTaQEVCrvMIr M0AvlcXzJyvw2fuNmRNGX+u+0a1xdwh0WlAPLL5gtJ1OSk5DFhPUcrkQN0pDXP+nVxp5tZqKB0z W8FewWwpFioOuL71dp+COAedQ4pw4kYR6f6bpyBI9JMVAgSEVXsZxa5b6Sm8J6bxht0HvPcCqrv 6jR4LPjyc3qVVOvGjzxrrc2oGzLzl7a1AvaxxNy1+t4CuLWpmG8NVUmWJU0edueOcDmr4EaYZ0K UVqkj3lnNMvyJk64EFXSAF+RhcWmCa8AbrshxPoNPHNnC8CJmWXCatlbKypCrm0MTpivjCSMatR ER7iGDtPdXHNPtQRlxVfkg6gCPaIuVLbu3/xFQnLE3EoMIluOTWtWwUmE7A3hwq5Da3/vk6mXEc wAAUxGlCzpekIc2Ut91EmUyqOQn8Gh5O5F2cgDtsgM0CQivmXS6TmBKgTPJkGm9Xy3TKygb8JV5 pF0OC99uk+5Z1bVSg3ZxYZs1gFO4CQyyvvzbx4CEL5nysGZElP/KEwnIvlWSckm4qfQmFLmZoc3 mteHaNwi4svjCYA== X-Developer-Key: i=rogerq@kernel.org; a=openpgp; fpr=412165D44C9F52780FAB1058D25A6BD3BE763093 If controller looses power during PM suspend then re-initialize it. We use the DEBUG_CFG register to track if controller lost power or was reset in PM suspend. Move all initialization code into dwc3_ti_init() so it can be re-used. Signed-off-by: Roger Quadros Acked-by: Thinh Nguyen --- drivers/usb/dwc3/dwc3-am62.c | 82 +++++++++++++++++++++++++++++--------------- 1 file changed, 55 insertions(+), 27 deletions(-) --- base-commit: adc218676eef25575469234709c2d87185ca223a change-id: 20241122-am62-dwc3-io-ddr-3bcb683a91a0 Best regards, diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c index fad151e78fd6..2192222faf4f 100644 --- a/drivers/usb/dwc3/dwc3-am62.c +++ b/drivers/usb/dwc3/dwc3-am62.c @@ -108,6 +108,9 @@ #define DWC3_AM62_AUTOSUSPEND_DELAY 100 +#define USBSS_DEBUG_CFG_OFF 0x7 +#define USBSS_DEBUG_CFG_DISABLED 0x7 + struct dwc3_am62 { struct device *dev; void __iomem *usbss; @@ -117,6 +120,7 @@ struct dwc3_am62 { unsigned int offset; unsigned int vbus_divider; u32 wakeup_stat; + void __iomem *phy; }; static const int dwc3_ti_rate_table[] = { /* in KHZ */ @@ -184,15 +188,47 @@ static int phy_syscon_pll_refclk(struct dwc3_am62 *am62) return 0; } +static int dwc3_ti_init(struct dwc3_am62 *am62) +{ + int ret; + u32 reg; + + /* Read the syscon property and set the rate code */ + ret = phy_syscon_pll_refclk(am62); + if (ret) + return ret; + + /* Workaround Errata i2409 */ + if (am62->phy) { + reg = readl(am62->phy + USB_PHY_PLL_REG12); + reg |= USB_PHY_PLL_LDO_REF_EN | USB_PHY_PLL_LDO_REF_EN_EN; + writel(reg, am62->phy + USB_PHY_PLL_REG12); + } + + /* VBUS divider select */ + reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG); + if (am62->vbus_divider) + reg |= 1 << USBSS_PHY_VBUS_SEL_SHIFT; + + dwc3_ti_writel(am62, USBSS_PHY_CONFIG, reg); + + clk_prepare_enable(am62->usb2_refclk); + + /* Set mode valid bit to indicate role is valid */ + reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL); + reg |= USBSS_MODE_VALID; + dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg); + + return 0; +} + static int dwc3_ti_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *node = pdev->dev.of_node; struct dwc3_am62 *am62; unsigned long rate; - void __iomem *phy; int i, ret; - u32 reg; am62 = devm_kzalloc(dev, sizeof(*am62), GFP_KERNEL); if (!am62) @@ -228,29 +264,17 @@ static int dwc3_ti_probe(struct platform_device *pdev) am62->rate_code = i; - /* Read the syscon property and set the rate code */ - ret = phy_syscon_pll_refclk(am62); - if (ret) - return ret; - - /* Workaround Errata i2409 */ - phy = devm_platform_ioremap_resource(pdev, 1); - if (IS_ERR(phy)) { + am62->phy = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(am62->phy)) { dev_err(dev, "can't map PHY IOMEM resource. Won't apply i2409 fix.\n"); - phy = NULL; - } else { - reg = readl(phy + USB_PHY_PLL_REG12); - reg |= USB_PHY_PLL_LDO_REF_EN | USB_PHY_PLL_LDO_REF_EN_EN; - writel(reg, phy + USB_PHY_PLL_REG12); + am62->phy = NULL; } - /* VBUS divider select */ am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); - reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG); - if (am62->vbus_divider) - reg |= 1 << USBSS_PHY_VBUS_SEL_SHIFT; - dwc3_ti_writel(am62, USBSS_PHY_CONFIG, reg); + ret = dwc3_ti_init(am62); + if (ret) + return ret; pm_runtime_set_active(dev); pm_runtime_enable(dev); @@ -258,7 +282,6 @@ static int dwc3_ti_probe(struct platform_device *pdev) * Don't ignore its dependencies with its children */ pm_suspend_ignore_children(dev, false); - clk_prepare_enable(am62->usb2_refclk); pm_runtime_get_noresume(dev); ret = of_platform_populate(node, NULL, NULL, dev); @@ -267,11 +290,6 @@ static int dwc3_ti_probe(struct platform_device *pdev) goto err_pm_disable; } - /* Set mode valid bit to indicate role is valid */ - reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL); - reg |= USBSS_MODE_VALID; - dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg); - /* Device has capability to wakeup system from sleep */ device_set_wakeup_capable(dev, true); ret = device_wakeup_enable(dev); @@ -338,6 +356,9 @@ static int dwc3_ti_suspend_common(struct device *dev) dwc3_ti_writel(am62, USBSS_WAKEUP_STAT, USBSS_WAKEUP_STAT_CLR); } + /* just to track if module resets on suspend */ + dwc3_ti_writel(am62, USBSS_DEBUG_CFG, USBSS_DEBUG_CFG_DISABLED); + clk_disable_unprepare(am62->usb2_refclk); return 0; @@ -348,7 +369,14 @@ static int dwc3_ti_resume_common(struct device *dev) struct dwc3_am62 *am62 = dev_get_drvdata(dev); u32 reg; - clk_prepare_enable(am62->usb2_refclk); + reg = dwc3_ti_readl(am62, USBSS_DEBUG_CFG); + if (reg != USBSS_DEBUG_CFG_DISABLED) { + /* lost power/context */ + dwc3_ti_init(am62); + } else { + dwc3_ti_writel(am62, USBSS_DEBUG_CFG, USBSS_DEBUG_CFG_OFF); + clk_prepare_enable(am62->usb2_refclk); + } if (device_may_wakeup(dev)) { /* Clear wakeup config enable bits */