From patchwork Mon Oct 14 08:50:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guan-Yu Lin X-Patchwork-Id: 835736 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 96EDE156F27 for ; Mon, 14 Oct 2024 08:58:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728896315; cv=none; b=lyIy+UnaVSpjGRy/Kn45Eiv48X3Xv49Pr5F23tz6b73LyMKittHyVFfsiF110v6yRh8PIV+oDk8ipdzzB63zCSWAvY2ECzttV9N3mb4O4tqQFgMVYNOKZ1vb4mqV+tejTKjS2JR1J6ex2O8yxMbz+JAWxza8l3UHmjw8DE/+hJ8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728896315; c=relaxed/simple; bh=MMmxOqDhjHtTHjEFNTHIGe5QUnWTlaXxSiuoBkNwdls=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=Yo/fmGiJiXQmqRdxmCCEZIbd02mAET1uCaoQi3nZ1OcGdDaDkfLWZ8e6GqqCVFFMP4z31SVxSAQotlCLNU5jyrEe3GW8DTTSYE4/npybEyWMFlrT9z8aeOMaZUffngETRQY+Vw+FrbgiX0hFalLUIqWlFcEi/uR3VVsuGSEq5tI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--guanyulin.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=vyR7KvOW; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--guanyulin.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vyR7KvOW" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e2939e25402so2162251276.2 for ; Mon, 14 Oct 2024 01:58:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1728896312; x=1729501112; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=tJDj6k1vZWgUdDR2yBxvdFEmNrvt6dXxlhPApMDJeNQ=; b=vyR7KvOWOewMpOqi2HAHxDueYFNKU4yoHUQGRPbGBtVK1kBAcCMQcHDKUOWgnzmOKQ SoopcLPBdcuzugGZ/zMF7GFDFBm2/RKHHDBb8hDW1BpesiyBLFLqVbr/RiL2KifNaXIr ut/w9zaWRcV8xkfQ3tKxz93pFdTU2yN4YKcJWqSO+ek8oqJm4C5RFw67Yxo5NtKn2u2/ 1Ydh1jUYzGPL4TZQKx4P6uGCKAnJR81gfkiaMygcqdvxg7oe4CZZszKW9xrFz4M5wtlV 8w2K6KmzMDf7SMXdH0QvMl0RUzy/AABdcrXEfg9ozEZI7pfrwibWo4bwJzvhtj02EXt3 /tmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728896312; x=1729501112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=tJDj6k1vZWgUdDR2yBxvdFEmNrvt6dXxlhPApMDJeNQ=; b=B9tDoh+O0D0mtl5I6vsbo+zmwcQSKvp4oiZxb3XpaNPvBbCJL/5VWmzc16Tqo2D41H GFZIvN3OT2Y/QzV0I5DRuT408u0SZHZnzdHlXQggnXRjsUBvsP9wYq5CsHlrdl+LBUw0 oadKv26Xd45IMj7CnpRcNKuRXGthzNjJNgR5JSYl0bHHG5gwj5Mstc2ezrD39bbKFkox oOnoIRQFllcVwwOKVxM/wkUiP77K89/TJNBjDLh6HsiC48dwGQrFP+PfaiDtSlNRHy2Q hbHoGv1Dk9V9fqA5aMk+bMeuaSVceix95KW4UzjI/qi1bJAuyLEaeCAvfeECTGwIDusX UTMw== X-Gm-Message-State: AOJu0YwtQXqGp4v1ieh98fwb+poKLsahg9CJ3lpE0GU1qQUrpwr3BWi/ R0OAYvXvK0v/FhjyAboXCCoOJFyKMdB+3oaCVomqLcHIC7d0ID3624/Ayqijwo1JUhSIrCXwzxC fW1rv3kM5bP4MGg== X-Google-Smtp-Source: AGHT+IF5SavWo6HiF0EKk/WneTyIT4aMwJqzb9YpJJYmmLH93XV8Gx3OlSgXCUZByk5zE4gjAPphiwPmqmu7LFo= X-Received: from guanyulin.c.googlers.com ([fda3:e722:ac3:cc00:131:cd17:ac11:19c7]) (user=guanyulin job=sendgmr) by 2002:a25:3607:0:b0:e1d:2043:da46 with SMTP id 3f1490d57ef6-e2919dd4d81mr44625276.3.1728896312291; Mon, 14 Oct 2024 01:58:32 -0700 (PDT) Date: Mon, 14 Oct 2024 08:50:24 +0000 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog Message-ID: <20241014085816.1401364-1-guanyulin@google.com> Subject: [PATCH v5 0/5] Support system sleep with offloaded usb transfers From: Guan-Yu Lin To: Thinh.Nguyen@synopsys.com, gregkh@linuxfoundation.org, mathias.nyman@intel.com, stern@rowland.harvard.edu, yajun.deng@linux.dev, sumit.garg@linaro.org, kekrby@gmail.com, oneukum@suse.com, dianders@chromium.org, perex@perex.cz, tiwai@suse.com, niko.mauno@vaisala.com, andreyknvl@gmail.com, christophe.jaillet@wanadoo.fr, tj@kernel.org, stanley_chang@realtek.com, quic_jjohnson@quicinc.com, ricardo@marliere.net Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, badhri@google.com, albertccwang@google.com, quic_wcheng@quicinc.com, pumahsu@google.com, Guan-Yu Lin Wesley Cheng and Mathias Nyman's USB offload design enables a co-processor to handle some USB transfers, potentially allowing the main system to sleep and save power. However, Linux's power management system halts the USB host controller when the main system isn't managing any USB transfers. To address this, the proposal modifies the system to recognize offloaded USB transfers and manage power accordingly. This involves two key steps: 1. Transfer Status Tracking: Propose xhci_sideband_get and xhci_sideband_put to track USB transfers on the co-processor, ensuring the system is aware of any ongoing activity. 2. Power Management Adjustment: Modifications to the USB driver stack (dwc3 controller driver, xhci host controller driver, and USB device drivers) allow the system to sleep without disrupting co-processor managed USB transfers. This involves adding conditional checks to bypass some power management operations. patches depends on series "Introduce QC USB SND audio offloading support" https://lore.kernel.org/lkml/20240925010000.2231406-11-quic_wcheng@quicinc.com/T/ changelog ---------- Changes in v5: - Walk through the USB children in usb_sideband_check() to determine the sideband activity under the specific USB device. - Replace atomic_t by refcount_t. - Reduce logs by using dev_dbg & remove __func__. Changes in v4: - Isolate the feature into USB driver stack. - Integrate with series "Introduce QC USB SND audio offloading support" Changes in v3: - Integrate the feature with the pm core framework. Changes in v2: - Cosmetics changes on coding style. [v3] PM / core: conditionally skip system pm in device/driver model [v2] usb: host: enable suspend-to-RAM control in userspace [v1] [RFC] usb: host: Allow userspace to control usb suspend flows --- Guan-Yu Lin (5): usb: dwc3: separate dev_pm_ops for each pm_event usb: xhci-plat: separate dev_pm_ops for each pm_event usb: add apis for sideband usage tracking xhci: sideband: add api to trace sideband usage usb: host: enable sideband transfer during system sleep drivers/usb/core/driver.c | 63 ++++++++++++++++++++++ drivers/usb/core/hcd.c | 1 + drivers/usb/core/usb.c | 1 + drivers/usb/dwc3/core.c | 90 ++++++++++++++++++++++++++++++- drivers/usb/dwc3/core.h | 8 +++ drivers/usb/host/xhci-plat.c | 38 +++++++++++-- drivers/usb/host/xhci-plat.h | 7 +++ drivers/usb/host/xhci-sideband.c | 74 +++++++++++++++++++++++++ include/linux/usb.h | 13 +++++ include/linux/usb/hcd.h | 4 ++ include/linux/usb/xhci-sideband.h | 5 ++ sound/usb/qcom/qc_audio_offload.c | 3 ++ 12 files changed, 302 insertions(+), 5 deletions(-)