From patchwork Tue Feb 27 10:44:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baochen Qiang X-Patchwork-Id: 13573533 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 CDA9C137C42; Tue, 27 Feb 2024 10:44:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709030687; cv=none; b=Pb/vB5diP+tupU4kPQhCxrZkAE/CX8tP9P7/rCtEhTHuOlYh/MG4oqnD0+2umFJnbza1QueRaeXi2f8o1sQhV+ndtOgj88iMZKWedWqrdYxcYLABeHpcqtnFZ0c3LGmcV3i8ymoafybR2g+3z1bZfbNgAxqQVbaL5/qrcYgZjLM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709030687; c=relaxed/simple; bh=YZVMohEoz2FiLgHoSgvJdIphNQvbIflAXKA8nwYiUF0=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=IajogrPF3BJMeYkIrNZ7fIRnZMKyrcTcr5x0mTX53+C6yTj8ymLXqZJO8as0ZBpL7ihBvhC64WQoIP7+DEN7b/yl68+cZfR42PUkAI8nkyLXmBqPMqTjBAqW1bXwnt0P3Y+lLQzWMqL5eIXRDsf9ssh81EekKl91aaWZ/YrBZBM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=RA1WKoqE; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="RA1WKoqE" Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 41R9YAeB002460; Tue, 27 Feb 2024 10:44:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding:content-type; s=qcppdkim1; bh=BzBNEPI RM3EW33DjvO4ncX3d6Tc7CfQR1rwcBY6Omc0=; b=RA1WKoqEqlGcfxZ4xpcY5C8 9OjrLnAIud9vtZdx7OqH6s9PwUL2md2ygAhIum3FVbJH+vOsxxWs9a4KeNPbLYbT 2efybYQUj2dXQJ26CH4fIO89fLoF3ub+D5RYduWd4twTLSSkwB8cPzws7UXe+/v0 GmPrsymAaShoow4Y7zt017Hgx5S8z0ajpD95ZHzIGKrVyuMchyMuK0jzZ3AVOReq iqIZBFkq3OH+8lQmeiCa9sYTcsGSf16oRT9Q6tkWfCBNt4iP8EWRvmK6IfxfhKvM vbVKb3vyKt5kmH0jRwov2KjmBVcG+/WYbg6BUd9rCeMp+WvIdeE//b7J0pOiTvw= = Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3wh64qh1ud-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Feb 2024 10:44:39 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 41RAicTB029191 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Feb 2024 10:44:38 GMT Received: from bqiang-SFF.qca.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 27 Feb 2024 02:44:36 -0800 From: Baochen Qiang To: , CC: , , , Subject: [PATCH v3 0/3] wifi: ath11k: hibernation support Date: Tue, 27 Feb 2024 18:44:24 +0800 Message-ID: <20240227104427.7505-1-quic_bqiang@quicinc.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: zpCuUjEd57oJCsR9tcysTua3qWVRj7p3 X-Proofpoint-GUID: zpCuUjEd57oJCsR9tcysTua3qWVRj7p3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-26_11,2024-02-26_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 priorityscore=1501 suspectscore=0 mlxlogscore=975 clxscore=1015 impostorscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2402120000 definitions=main-2402270083 Currently in ath11k we keep the firmware running on the WLAN device when the network interface (wlan0) is down. The problem is that this will break hibernation, obviously the firmware can't be running after the whole system is powered off. To power down the ath11k firmware for suspend/hibernation some changes both in MHI subsystem and ath11k are needed. This patchset fixes a longstanding bug report about broken hibernation support: https://bugzilla.kernel.org/show_bug.cgi?id=214649 There already is an RFC version which has been tested by multiple users with positive results: https://patchwork.kernel.org/project/linux-wireless/cover/20231127162022.518834-1-kvalo@kernel.org/ Basically the RFC version adds two APIs to MHI stack: with the first one ath11k is able to keep MHI devices when going to suspend/hibernation, getting us rid of the probe deferral issue when resume back. while with the second one ath11k could manually prepare/unprepare MHI channels by itself, which is needed because QRTR doesn't probe those channels automatically in this case. Mani, the MHI maintainer, firstly doesn't like that version and insists that an MHI device should be destroyed when suspend/hibernation, according to his understanding on device driver model. See https://lore.kernel.org/mhi/20231127162022.518834-1-kvalo@kernel.org/ After a long discussion Mani thought we might need a new PM callback with which ath11k is able to wait until kernel unblocks device probe and thus MHI channels get probed. So we came to the kernel PM list and there Mani realized that his understanding is not correct so he finally agrees to keep MHI device during suspend/hibernation. See https://lore.kernel.org/all/21cd2098-97e1-4947-a5bb-a97582902ead@quicinc.com/ Mani also pointed out that an MHI controller driver (ath11k here) should not touch MHI channels directly because those channels are managed by the corresponding MHI client driver (QRTR here). To address this, we come up with this version. Compared with that RFC version, this version adds PM callbacks in QRTR module: suspend callback unprepares MHI channels during suspend and resume callback prepares those channels during resume. In this way ath11k doesn't need to do unprepare/prepare work by itself so those two APIs added in RFC version are removed now. The power down/up procedure requires a specific sequence in which PM callbacks of wiphy, ath11k and QRTR are called, this is achieved by exploiting the child-father relationship between their device struct, and also the PM framework which separates whole suspend/resume process into several stages. Details in patch [3/3]. v3: - skip QRTR suspend/resume if MHI device is found to be in suspend state. v2: - add comment on why destroying the device is optional in mhi_pm_disable_transition(). - rename mhi_power_down_no_destroy() as mhi_power_down_keep_dev(). - refine API description of mhi_power_down() and mhi_power_down_keep_dev(). - add/remove __maybe_unused to QRTR PM callbacks. - remove '#ifdef CONFIG_PM'. - refine commit log of patch 1/3 and 2/3. Baochen Qiang (3): bus: mhi: host: add mhi_power_down_keep_dev() net: qrtr: support suspend/hibernation wifi: ath11k: support hibernation drivers/bus/mhi/host/internal.h | 4 +- drivers/bus/mhi/host/pm.c | 42 ++++++++-- drivers/net/wireless/ath/ath11k/ahb.c | 6 +- drivers/net/wireless/ath/ath11k/core.c | 105 +++++++++++++++++-------- drivers/net/wireless/ath/ath11k/core.h | 6 +- drivers/net/wireless/ath/ath11k/hif.h | 14 +++- drivers/net/wireless/ath/ath11k/mhi.c | 12 ++- drivers/net/wireless/ath/ath11k/mhi.h | 5 +- drivers/net/wireless/ath/ath11k/pci.c | 44 +++++++++-- drivers/net/wireless/ath/ath11k/qmi.c | 2 +- include/linux/mhi.h | 18 ++++- net/qrtr/mhi.c | 46 +++++++++++ 12 files changed, 244 insertions(+), 60 deletions(-) base-commit: c39a5cfa0448f3afbee78373f16d87815a674f11