From patchwork Mon Feb 5 14:12:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roger Quadros X-Patchwork-Id: 13545603 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 5035F32C93; Mon, 5 Feb 2024 14:12:43 +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=1707142364; cv=none; b=VODbLqgIY37TzxNhc+iW5n/gawAz+zgkTeBpO0Y6ykfL9llyC6JDgna1E5VeNdTh55ezyukZiFY0SYvpjTD3pO1ClMuY6jl+Xd1be2PP4AZm6DDW4rvBq9/CvUZn88Yo9pmJScRnTCvumXTWs3VkYyiJwz8mlQ50nloxGlsSOMc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707142364; c=relaxed/simple; bh=h/Wjhl4phEKjtwys+YLS96BL5IrD+pUdM1DisLakQwI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=j5+VoSisPhSP/p1AsV0azcolmmDJ1JqejGpkiBVObtz1kLIq1YcMkZMzy+76gMO7eMe1/xjKIXuBrDta8J0nNycXzetmkPTABtiV1SpgCK+AvMHlewsGJAGQTkndKPQLksGSM2Fh/+75oyggAUzv9/fMV32K0N1A6gHswlNJblo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Gd8iKo+q; 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="Gd8iKo+q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1439C433A6; Mon, 5 Feb 2024 14:12:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707142363; bh=h/Wjhl4phEKjtwys+YLS96BL5IrD+pUdM1DisLakQwI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Gd8iKo+qWSY0wR4esH/qgfx2hrvkVTjGhH9Nz/yHmqLI4WTGVETLnqOsTpUmRaMKJ qoHQuQnZ5DGIU+WhQEDoOJWvdnUDz+EDBOcttpoIlIrzLJdfO/hiXJdp/VhkwhyPVH YWb5skYGzrfu56Qx1e52hPecq5mK777xKqViQ/zcrcOgR/N934Cw1R0Ho7diN/RMHc kURZj6+Hlkgcg8sGbDafscm4LoxHvXx4rEvKkdIoSDLOBq1CRO/ZHoPJVcx/bTNbNP PU/EEf+jVoLYUraguGBbgfvs9FXyiLvbVOp7ZGQx85WU5nL5BT9qyuz8af47v73Eq+ Vzphk47VCKxOg== From: Roger Quadros To: Thinh.Nguyen@synopsys.com Cc: gregkh@linuxfoundation.org, r-gunasekaran@ti.com, b-liu@ti.com, afd@ti.com, nm@ti.com, srk@ti.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Roger Quadros , Rob Herring , Krzysztof Kozlowski , Conor Dooley Subject: [PATCH v2 5/5] usb: dwc3-am62: add workaround for Errata i2409 Date: Mon, 5 Feb 2024 16:12:21 +0200 Message-Id: <20240205141221.56076-6-rogerq@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240205141221.56076-1-rogerq@kernel.org> References: <20240205141221.56076-1-rogerq@kernel.org> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 All AM62 devices have Errata i2409 [1] due to which USB2 PHY may lock up due to short suspend. Workaround involves setting bit 5 and 4 PLL_REG12 in PHY2 register space after USB controller is brought out of LPSC reset but before controller initialization. Handle this workaround. [1] - https://www.ti.com/lit/er/sprz487d/sprz487d.pdf Cc: Rob Herring Cc: Krzysztof Kozlowski Cc: Conor Dooley Signed-off-by: Roger Quadros --- Notes: Changelog: v2: - don't add phy read/write helpers or add phy to private data v1: https://lore.kernel.org/all/20240201121220.5523-5-rogerq@kernel.org/ drivers/usb/dwc3/dwc3-am62.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c index af1ce934e7fb..5ae5c3087b0f 100644 --- a/drivers/usb/dwc3/dwc3-am62.c +++ b/drivers/usb/dwc3/dwc3-am62.c @@ -101,6 +101,11 @@ #define PHY_CORE_VOLTAGE_MASK BIT(31) #define PHY_PLL_REFCLK_MASK GENMASK(3, 0) +/* USB PHY2 register offsets */ +#define USB_PHY_PLL_REG12 0x130 +#define USB_PHY_PLL_LDO_REF_EN BIT(5) +#define USB_PHY_PLL_LDO_REF_EN_EN BIT(4) + #define DWC3_AM62_AUTOSUSPEND_DELAY 100 struct dwc3_am62 { @@ -184,8 +189,9 @@ 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; - int i, ret; unsigned long rate; + void __iomem *phy; + int i, ret; u32 reg; am62 = devm_kzalloc(dev, sizeof(*am62), GFP_KERNEL); @@ -201,6 +207,12 @@ static int dwc3_ti_probe(struct platform_device *pdev) return PTR_ERR(am62->usbss); } + phy = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(phy)) { + dev_err(dev, "can't map PHY IOMEM resource. Won't apply i2409 fix.\n"); + phy = NULL; + } + am62->usb2_refclk = devm_clk_get(dev, "ref"); if (IS_ERR(am62->usb2_refclk)) { dev_err(dev, "can't get usb2_refclk\n"); @@ -227,6 +239,13 @@ static int dwc3_ti_probe(struct platform_device *pdev) if (ret) return ret; + /* Workaround Errata i2409 */ + if (phy) { + 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); + } + /* VBUS divider select */ am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG);