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[23.128.96.18]) by mx.google.com with ESMTP id z21si8292017ejf.623.2021.06.12.20.27.30; Sat, 12 Jun 2021 20:27:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231609AbhFMD1k (ORCPT + 99 others); Sat, 12 Jun 2021 23:27:40 -0400 Received: from mga17.intel.com ([192.55.52.151]:53882 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230281AbhFMD1k (ORCPT ); Sat, 12 Jun 2021 23:27:40 -0400 IronPort-SDR: IWpK5c/D7V81XjanoirRbTwN1jH348F7pZiCgCJkG6gBtx9mmuTDS80P43Hxuc8/7FrRqihBSO 72BQ+5Gcmfng== X-IronPort-AV: E=McAfee;i="6200,9189,10013"; a="186066748" X-IronPort-AV: E=Sophos;i="5.83,270,1616482800"; d="scan'208";a="186066748" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jun 2021 20:25:36 -0700 IronPort-SDR: HUGo9qOeNR94Lt0nN5DrKSLfpa9hk/uhsL97rD2lb/Lj7s2MKZIZokuPvKUYhnqSCSqB0v7mBo l5o/Zz4s4oew== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,270,1616482800"; d="scan'208";a="449521634" Received: from host.sh.intel.com ([10.239.154.115]) by orsmga008.jf.intel.com with ESMTP; 12 Jun 2021 20:25:34 -0700 From: Ye Xiang To: jikos@kernel.org, jic23@kernel.org, srinivas.pandruvada@linux.intel.com Cc: linux-input@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Ye Xiang Subject: [PATCH] HID: intel-ish-hid: use async resume function Date: Sun, 13 Jun 2021 11:25:07 +0800 Message-Id: <20210613032507.7474-1-xiang.ye@intel.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ISH IPC driver uses asynchronous workqueue to do resume now, but there is a potential timing issue: when child devices resume before bus driver, it will cause child devices resume failed and cannot be recovered until reboot. The current implementation in this case do wait for IPC to resume but fail to accommodate for a case when there is no ISH reboot and soft resume is taking time. This issue is apparent on Tiger Lake platform with 5.11.13 kernel when doing suspend to idle then resume(s0ix) test. To resolve this issue, we change ISHTP HID client to use asynchronous resume callback too. In the asynchronous resume callback, it waits for the ISHTP resume done event, and then notify ISHTP HID client link ready. Signed-off-by: Ye Xiang --- drivers/hid/intel-ish-hid/ishtp-hid-client.c | 15 +++++++++- drivers/hid/intel-ish-hid/ishtp-hid.h | 1 + drivers/hid/intel-ish-hid/ishtp/bus.c | 29 +++++++++++++++----- include/linux/intel-ish-client-if.h | 2 ++ 4 files changed, 39 insertions(+), 8 deletions(-) diff --git a/drivers/hid/intel-ish-hid/ishtp-hid-client.c b/drivers/hid/intel-ish-hid/ishtp-hid-client.c index 7167412d89d9..9d53e85fdef3 100644 --- a/drivers/hid/intel-ish-hid/ishtp-hid-client.c +++ b/drivers/hid/intel-ish-hid/ishtp-hid-client.c @@ -779,6 +779,17 @@ static void hid_ishtp_cl_reset_handler(struct work_struct *work) } } +static void hid_ishtp_cl_resume_handler(struct work_struct *work) +{ + struct ishtp_cl_data *client_data = container_of(work, struct ishtp_cl_data, resume_work); + struct ishtp_cl *hid_ishtp_cl = client_data->hid_ishtp_cl; + + if (ishtp_wait_resume(ishtp_get_ishtp_device(hid_ishtp_cl))) { + client_data->suspended = false; + wake_up_interruptible(&client_data->ishtp_resume_wait); + } +} + void (*hid_print_trace)(void *unused, const char *format, ...); /** @@ -817,6 +828,8 @@ static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device) init_waitqueue_head(&client_data->ishtp_resume_wait); INIT_WORK(&client_data->work, hid_ishtp_cl_reset_handler); + INIT_WORK(&client_data->resume_work, hid_ishtp_cl_resume_handler); + hid_print_trace = ishtp_trace_callback(cl_device); @@ -918,7 +931,7 @@ static int hid_ishtp_cl_resume(struct device *device) hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); - client_data->suspended = false; + schedule_work(&client_data->resume_work); return 0; } diff --git a/drivers/hid/intel-ish-hid/ishtp-hid.h b/drivers/hid/intel-ish-hid/ishtp-hid.h index 5ffd0da3cf1f..e5fa753fe92f 100644 --- a/drivers/hid/intel-ish-hid/ishtp-hid.h +++ b/drivers/hid/intel-ish-hid/ishtp-hid.h @@ -140,6 +140,7 @@ struct ishtp_cl_data { int multi_packet_cnt; struct work_struct work; + struct work_struct resume_work; struct ishtp_cl_device *cl_device; }; diff --git a/drivers/hid/intel-ish-hid/ishtp/bus.c b/drivers/hid/intel-ish-hid/ishtp/bus.c index 0d6465f0eaa8..ead6c8f32759 100644 --- a/drivers/hid/intel-ish-hid/ishtp/bus.c +++ b/drivers/hid/intel-ish-hid/ishtp/bus.c @@ -329,13 +329,6 @@ static int ishtp_cl_device_resume(struct device *dev) if (!device) return 0; - /* - * When ISH needs hard reset, it is done asynchrnously, hence bus - * resume will be called before full ISH resume - */ - if (device->ishtp_dev->resume_flag) - return 0; - driver = to_ishtp_cl_driver(dev->driver); if (driver && driver->driver.pm) { if (driver->driver.pm->resume) @@ -863,6 +856,28 @@ struct device *ishtp_device(struct ishtp_cl_device *device) } EXPORT_SYMBOL(ishtp_device); +/** + * ishtp_wait_resume() - Wait for IPC resume + * + * Wait for IPC resume + * + * Return: resume complete or not + */ +bool ishtp_wait_resume(struct ishtp_device *dev) +{ + /* 50ms to get resume response */ + #define WAIT_FOR_RESUME_ACK_MS 50 + + /* Waiting to get resume response */ + if (dev->resume_flag) + wait_event_interruptible_timeout(dev->resume_wait, + !dev->resume_flag, + msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS)); + + return (!dev->resume_flag); +} +EXPORT_SYMBOL_GPL(ishtp_wait_resume); + /** * ishtp_get_pci_device() - Return PCI device dev pointer * This interface is used to return PCI device pointer diff --git a/include/linux/intel-ish-client-if.h b/include/linux/intel-ish-client-if.h index 1153e0030133..ec3a6ccbece4 100644 --- a/include/linux/intel-ish-client-if.h +++ b/include/linux/intel-ish-client-if.h @@ -76,6 +76,8 @@ int ishtp_register_event_cb(struct ishtp_cl_device *device, /* Get the device * from ishtp device instance */ struct device *ishtp_device(struct ishtp_cl_device *cl_device); +/* wait for IPC resume */ +bool ishtp_wait_resume(struct ishtp_device *dev); /* Trace interface for clients */ void *ishtp_trace_callback(struct ishtp_cl_device *cl_device); /* Get device pointer of PCI device for DMA acces */ base-commit: f5711311bfa1abcc64c6dd1e912666a8c0b29a1a -- 2.17.1