From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 8808347CA95; Tue, 1 Sep 2026 10:06:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788257165; cv=none; b=AyUXGdo5zE3s1CZpI25hAUEHqb28OCEbo6kH1FFbet9QUJ39HYn0oBzbM8D2DXPPjvDIhjP4zen/sGeTdgJaRiL0N6TqmMD0CKpq/O00Ebf2IFoknE3tiqlUADdi5Rnm3/wgPjkCOta0J903OleEpyMK1kaCRpUxokee0VdRyvg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788257165; c=relaxed/simple; bh=Q+3pj/vnTA7xV0+Z/9qCObPeTNlsm4LzE3wz2Lk7Duc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TQ0dMIE22ihzgh8oeS/ZopPcd6em3ZcoelvCfbaop7mg//lXRRnF5AITIbWjvONZrJOrelNlPtNXvGscN8O3f/r21dIYTZzFmqZvJN8De8zfveYiSdVpzfuyq2het/fB6PI/0wGfFjdZTBCnXdp4tAwPX1SgcjMqARvKjcVNP3w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VPLPYtn2; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VPLPYtn2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F2BFF1F000E9; Tue, 1 Sep 2026 10:06:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788257164; bh=reri38xtBHKiLor8QA7An/7PP6yRyTuLkxSPSjIM2Ms=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=VPLPYtn2ZUTMYJk9w0hVENUQxBMmc6/xMOREvbq8++1j1lMW3VRtV/phIKrWYIhrB s05KgyyS9mOImLQd/SJIL7fCv/xlosWooeO0wPO200mqsCWV0OwGAZ6/FCqNf0lHPD Ys1o24ADSM8g0YSnd8mYnz23m+oV7dpcIcPOILCvysS1NQw9jWF90VZQIu4M+cIfy1 6yhRvVi+M/vbHWOWyJZ+iKhLgbIQ5LQYTwswQ+yAMJMSyyKV5DrVVP57qxaBJLUi92 wsT28mdj2ff+WmeIxftC17bMqk8pBsAXRFZNi6oFUBgLViWDL23w3xBy/eKqEpGb7Q 9Z+xkNKXA+DOw== From: Konrad Dybcio Date: Tue, 01 Sep 2026 12:05:46 +0200 Subject: [PATCH v3 4/4] usb: dwc3: Notify XHCI core of tunneled status Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260901-topic-dwc3_tunneling_state-v3-4-22fdced8de55@oss.qualcomm.com> References: <20260901-topic-dwc3_tunneling_state-v3-0-22fdced8de55@oss.qualcomm.com> In-Reply-To: <20260901-topic-dwc3_tunneling_state-v3-0-22fdced8de55@oss.qualcomm.com> To: Thinh Nguyen , Greg Kroah-Hartman , Mathias Nyman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, usb4-upstream@oss.qualcomm.com, Raghavendra Thoorpu , Mika Westerberg , Sven Peter , Konrad Dybcio X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1788257146; l=4047; i=konrad.dybcio@oss.qualcomm.com; s=20230215; h=from:subject:message-id; bh=DIvE0BBVaBASrRJ+URFMpKtlSBMj9uhytSqW4wNW96M=; b=YwCGAMS1XX99MZQr72bp6h0+5nEbMaSJWWtWULe9G4/qEiC/nttjY/sD6medFff2UivCdiY0q aJmBr9qfAjHCtYJIAftWBuUH3PoNYJmyYw04c6WxI1Fxz6RImyjL5KF X-Developer-Key: i=konrad.dybcio@oss.qualcomm.com; a=ed25519; pk=iclgkYvtl2w05SSXO5EjjSYlhFKsJ+5OSZBjOkQuEms= From: Konrad Dybcio The Thunderbolt framework relies on the USB core to create device links for tunneled ports, so that the USB3 controller is only kept runtime-resumed for the duration of the tunneling. This depends on first knowing whether a connection is tunneled or native. Add the logic to handle that for DWC3 controllers. Signed-off-by: Konrad Dybcio --- drivers/usb/dwc3/core.c | 16 ++++++++++++++++ drivers/usb/dwc3/core.h | 18 ++++++++++++++++++ drivers/usb/dwc3/host.c | 12 ++++++++++++ 3 files changed, 46 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index fd5c2cd36c59..6af8937525ff 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -162,6 +162,22 @@ void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode, bool ignore_susphy) } EXPORT_SYMBOL_GPL(dwc3_set_prtcap); +enum usb_link_tunnel_mode dwc3_link_tunnel_mode(struct dwc3 *dwc, u8 port) +{ + /* Prior versions had no CIO support */ + if (!DWC3_VER_IS_WITHIN(DWC31, 191A, ANY)) + return USB_LINK_UNKNOWN; + + /* Not all DWC3 instances have CIO HW, trust the platform firmware */ + if (!device_property_present(dwc->dev, "usb4-host-interface")) + return USB_LINK_UNKNOWN; + + if (dwc3_readl(dwc, DWC3_CIOCTRL(port)) & DWC3_CIOCTRL_CIO_EN) + return USB_LINK_TUNNELED; + + return USB_LINK_NATIVE; +} + static void __dwc3_set_mode(struct work_struct *work) { struct dwc3 *dwc = work_to_dwc(work); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 608daeb7ef10..decc51cd6505 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -179,6 +179,11 @@ #define DWC3_OEVTEN 0xcc0C #define DWC3_OSTS 0xcc10 +/* CIO regs */ +#define DWC3_CIO_BASE(n) (0xcd20 + ((n) * 0x30)) +#define DWC3_CIOCTRL(n) (DWC3_CIO_BASE(n) + 0x00) +#define DWC3_CIOCTRL_CIO_EN BIT(0) + #define DWC3_LLUCTL(n) (0xd024 + ((n) * 0x80)) /* Bit fields */ @@ -1314,6 +1319,7 @@ struct dwc3 { #define DWC31_REVISION_170A 0x3137302a #define DWC31_REVISION_180A 0x3138302a #define DWC31_REVISION_190A 0x3139302a +#define DWC31_REVISION_191A 0x3139312a #define DWC31_REVISION_200A 0x3230302a #define DWC32_REVISION_ANY 0x0 @@ -1658,11 +1664,23 @@ static inline void dwc3_pre_run_stop(struct dwc3 *dwc, bool is_on) #if IS_ENABLED(CONFIG_USB_DWC3_HOST) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) int dwc3_host_init(struct dwc3 *dwc); void dwc3_host_exit(struct dwc3 *dwc); + +/** + * dwc3_link_tunnel_mode - Check whether the link is tunneled over TBT/USB4 + * @dwc: Pointer to DWC3 controller context + * @port: 0-based port index + * + * Returns: USB_LINK_TUNNELED if tunneled, USB_LINK_NATIVE if not, or + * when the controller does not have USB4 capabilities. + */ +enum usb_link_tunnel_mode dwc3_link_tunnel_mode(struct dwc3 *dwc, u8 port); #else static inline int dwc3_host_init(struct dwc3 *dwc) { return 0; } static inline void dwc3_host_exit(struct dwc3 *dwc) { } +static inline enum usb_link_tunnel_mode dwc3_link_tunnel_mode(struct dwc3 *dwc, u8 port) +{ return USB_LINK_UNKNOWN; } #endif #if IS_ENABLED(CONFIG_USB_DWC3_GADGET) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c index c5674161b2b0..1b9c4f94c2fd 100644 --- a/drivers/usb/dwc3/host.c +++ b/drivers/usb/dwc3/host.c @@ -78,8 +78,20 @@ static void dwc3_xhci_plat_start(struct usb_hcd *hcd) dwc3_enable_susphy(dwc, true); } +static enum usb_link_tunnel_mode dwc3_xhci_tunnel_mode(struct usb_hcd *hcd, int portnum) +{ + struct platform_device *pdev; + struct dwc3 *dwc; + + pdev = to_platform_device(hcd->self.controller); + dwc = dev_get_drvdata(pdev->dev.parent); + + return dwc3_link_tunnel_mode(dwc, portnum); +} + static const struct xhci_plat_priv dwc3_xhci_plat_quirk = { .plat_start = dwc3_xhci_plat_start, + .tunnel_mode = dwc3_xhci_tunnel_mode, }; static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc, -- 2.55.0