From patchwork Mon Oct 28 12:42:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tero Kristo X-Patchwork-Id: 177920 Delivered-To: patch@linaro.org Received: by 2002:a92:409a:0:0:0:0:0 with SMTP id d26csp3339440ill; Mon, 28 Oct 2019 05:43:27 -0700 (PDT) X-Google-Smtp-Source: APXvYqwwM3VQ3Z7dhM01+uPasWRp8+S+W6ltxl6gKnUneBw1Y1VqkVatWYejxy+Cjqg/+3nwxT5b X-Received: by 2002:a50:f40c:: with SMTP id r12mr19476699edm.50.1572266607259; Mon, 28 Oct 2019 05:43:27 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1572266607; cv=none; d=google.com; s=arc-20160816; b=iSl+2RVJhOc5tr1cgrcXMBdgule8UiuZCjDbcX1bbiLoLq/6vfTcAsmjz1r69+NA8/ 1ddi8ypAhFm/wfieTKAhrm5Ac37z6bMpiUHNrcXjJc9PMVAfzoWO/N0jSBiM+A/4HcLH PR/fZdqHc8QQXkGB6R6y+WWPC3R7RWw4XIkN7JJRfgsLKydGC6nTfrq5HiDKFThdiiG3 mOzRAzLM7yim0s6CFsVADbMvvPrsSA5lEGju27QVchQ5EpKfS2wbhCroGlsOohv5OWfK 76kI9lqb5oEGUt28s28FfKwn4zks+zR/euPEJMGBg6pmGCuzjPXPkIF+d8ZRjG6brj/D h6Ug== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature; bh=IukYFzDkiSMrQ6S0FDCYhbnA7FNEtc4qXaqzQbxLG6A=; b=UhNRynOzGfYAJzkuY7wBrIRh+XUm6v4X2Grht060aLm0wUV6/NcrqFIz6VDZ6VeSy6 A3R8pBZ+rlmbVQ4mLGBpdi+Dko8PDlw0x3NCxhWqAiAts/SNHtlsVWsHDux/+/i8fYdA c6Jf19jKNA4SucO1FaX7icTfA4A4QUHWj9O92c4jNH3HCmjv6ZmLw3+I1gOPW0xObBZw 6mqclV81kb/4giKpRSFsfAekkKXOmKrRmcNYZ7YVeNrxZrwhIeYXuZXlQemM47oBE6FX tU9CatLDPJfHmbjJUV1DXLjrFpvahqX3zKIrlKQ3H8flwH2tVaTfwz1J19gnUSnITb7g 7c9w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=oZO1sXbY; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 26si7378003edz.340.2019.10.28.05.43.27; Mon, 28 Oct 2019 05:43:27 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=oZO1sXbY; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389412AbfJ1MnZ (ORCPT + 26 others); Mon, 28 Oct 2019 08:43:25 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:46292 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389395AbfJ1MnX (ORCPT ); Mon, 28 Oct 2019 08:43:23 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x9SChLZ5047814; Mon, 28 Oct 2019 07:43:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1572266601; bh=IukYFzDkiSMrQ6S0FDCYhbnA7FNEtc4qXaqzQbxLG6A=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=oZO1sXbYKAEfnVFby252Zg2E2IPjyukV7awiApruZTX1ns+1PLuzM63XTv9yUHxne p+vEcbpBuP3Z2/oxkKoMudy8yZ11Q5/ZyJ8c2kwzQPMTaZJZ9HXBl8pUcvcEyw75qY sNPHgq2MlIipPKPN5LqQIQioUTZ/Xnd7mU76+9dw= Received: from DFLE111.ent.ti.com (dfle111.ent.ti.com [10.64.6.32]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x9SChLDY069688 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 28 Oct 2019 07:43:21 -0500 Received: from DFLE114.ent.ti.com (10.64.6.35) by DFLE111.ent.ti.com (10.64.6.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Mon, 28 Oct 2019 07:43:09 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Mon, 28 Oct 2019 07:43:09 -0500 Received: from sokoban.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id x9SCgoh5063574; Mon, 28 Oct 2019 07:43:19 -0500 From: Tero Kristo To: , , CC: , , , Tero Kristo Subject: [PATCH 13/17] remoteproc/omap: add support for system suspend/resume Date: Mon, 28 Oct 2019 14:42:34 +0200 Message-ID: <20191028124238.19224-14-t-kristo@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191028124238.19224-1-t-kristo@ti.com> References: <20191028124238.19224-1-t-kristo@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Suman Anna This patch adds the support for system suspend/resume to the OMAP remoteproc driver so that the OMAP remoteproc devices can be suspended/resumed during a system suspend/resume. The support is added through the driver PM .suspend/.resume callbacks, and requires appropriate support from the OS running on the remote processors. The IPU & DSP remote processors typically have their own private modules like registers, internal memories, caches etc. The context of these modules need to be saved and restored properly for a suspend/resume to work. These are in general not accessible from the MPU, so the remote processors themselves have to implement the logic for the context save & restore of these modules. The OMAP remoteproc driver initiates a suspend by sending a mailbox message requesting the remote processor to save its context and enter into an idle/standby state. The remote processor should usually stop whatever processing it is doing to switch to a context save mode. The OMAP remoteproc driver detects the completion of the context save by checking the module standby status for the remoteproc device. It also stops any resources used by the remote processors like the timers. The timers need to be running only when the processor is active and executing, and need to be stopped otherwise to allow the timer driver to reach low-power states. The IOMMUs are automatically suspended by the PM core during the late suspend stage, after the remoteproc suspend process is completed by putting the remote processor cores into reset. Thereafter, the Linux kernel can put the domain into further lower power states as possible. The resume sequence undoes the operations performed in the PM suspend callback, by starting the timers and finally releasing the processors from reset. This requires that the remote processor side OS be able to distinguish a power-resume boot from a power-on/cold boot, restore the context of its private modules saved during the suspend phase, and resume executing code from where it was suspended. The IOMMUs would have been resumed by the PM core during early resume, so they are already enabled by the time remoteproc resume callback gets invoked. The remote processors should save their context into System RAM (DDR), as any internal memories are not guaranteed to retain context as it depends on the lowest power domain that the remote processor device is put into. The management of the DDR contents will be managed by the Linux kernel. Signed-off-by: Suman Anna [t-kristo@ti.com: converted to use ti-sysc instead of hwmod] Signed-off-by: Tero Kristo --- drivers/remoteproc/omap_remoteproc.c | 180 +++++++++++++++++++++++++++ drivers/remoteproc/omap_remoteproc.h | 18 ++- 2 files changed, 196 insertions(+), 2 deletions(-) -- 2.17.1 -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c index 8450dd79d391..410bf1b56e93 100644 --- a/drivers/remoteproc/omap_remoteproc.c +++ b/drivers/remoteproc/omap_remoteproc.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -24,10 +25,13 @@ #include #include #include +#include #include #include #include #include +#include +#include #include @@ -85,6 +89,9 @@ struct omap_rproc_timer { * @timers: timer(s) info used by rproc * @rproc: rproc handle * @reset: reset handle + * @pm_comp: completion primitive to sync for suspend response + * @fck: functional clock for the remoteproc + * @suspend_acked: state machine flag to store the suspend request ack */ struct omap_rproc { struct mbox_chan *mbox; @@ -96,6 +103,9 @@ struct omap_rproc { struct omap_rproc_timer *timers; struct rproc *rproc; struct reset_control *reset; + struct completion pm_comp; + struct clk *fck; + bool suspend_acked; }; /** @@ -346,6 +356,11 @@ static void omap_rproc_mbox_callback(struct mbox_client *client, void *data) case RP_MBOX_ECHO_REPLY: dev_info(dev, "received echo reply from %s\n", name); break; + case RP_MBOX_SUSPEND_ACK: + case RP_MBOX_SUSPEND_CANCEL: + oproc->suspend_acked = msg == RP_MBOX_SUSPEND_ACK; + complete(&oproc->pm_comp); + break; default: if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG) return; @@ -522,6 +537,157 @@ static const struct rproc_ops omap_rproc_ops = { .da_to_va = omap_rproc_da_to_va, }; +#ifdef CONFIG_PM +static bool _is_rproc_in_standby(struct omap_rproc *oproc) +{ + return ti_clk_is_in_standby(oproc->fck); +} + +/* 1 sec is long enough time to let the remoteproc side suspend the device */ +#define DEF_SUSPEND_TIMEOUT 1000 +static int _omap_rproc_suspend(struct rproc *rproc) +{ + struct device *dev = rproc->dev.parent; + struct omap_rproc *oproc = rproc->priv; + unsigned long to = msecs_to_jiffies(DEF_SUSPEND_TIMEOUT); + unsigned long ta = jiffies + to; + int ret; + + reinit_completion(&oproc->pm_comp); + oproc->suspend_acked = false; + ret = mbox_send_message(oproc->mbox, (void *)RP_MBOX_SUSPEND_SYSTEM); + if (ret < 0) { + dev_err(dev, "PM mbox_send_message failed: %d\n", ret); + return ret; + } + + ret = wait_for_completion_timeout(&oproc->pm_comp, to); + if (!oproc->suspend_acked) + return -EBUSY; + + /* + * The remoteproc side is returning the ACK message before saving the + * context, because the context saving is performed within a SYS/BIOS + * function, and it cannot have any inter-dependencies against the IPC + * layer. Also, as the SYS/BIOS needs to preserve properly the processor + * register set, sending this ACK or signalling the completion of the + * context save through a shared memory variable can never be the + * absolute last thing to be executed on the remoteproc side, and the + * MPU cannot use the ACK message as a sync point to put the remoteproc + * into reset. The only way to ensure that the remote processor has + * completed saving the context is to check that the module has reached + * STANDBY state (after saving the context, the SYS/BIOS executes the + * appropriate target-specific WFI instruction causing the module to + * enter STANDBY). + */ + while (!_is_rproc_in_standby(oproc)) { + if (time_after(jiffies, ta)) + return -ETIME; + schedule(); + } + + reset_control_assert(oproc->reset); + + ret = omap_rproc_disable_timers(rproc, false); + if (ret) { + dev_err(dev, "disabling timers during suspend failed %d\n", + ret); + goto enable_device; + } + + return 0; + +enable_device: + reset_control_deassert(oproc->reset); + return ret; +} + +static int _omap_rproc_resume(struct rproc *rproc) +{ + struct device *dev = rproc->dev.parent; + struct omap_rproc *oproc = rproc->priv; + int ret; + + /* boot address could be lost after suspend, so restore it */ + if (oproc->boot_data) { + ret = omap_rproc_write_dsp_boot_addr(rproc); + if (ret) { + dev_err(dev, "boot address restore failed %d\n", ret); + goto out; + } + } + + ret = omap_rproc_enable_timers(rproc, false); + if (ret) { + dev_err(dev, "enabling timers during resume failed %d\n", + ret); + goto out; + } + + reset_control_deassert(oproc->reset); + +out: + return ret; +} + +static int __maybe_unused omap_rproc_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rproc *rproc = platform_get_drvdata(pdev); + int ret = 0; + + mutex_lock(&rproc->lock); + if (rproc->state == RPROC_OFFLINE) + goto out; + + if (rproc->state == RPROC_SUSPENDED) + goto out; + + if (rproc->state != RPROC_RUNNING) { + ret = -EBUSY; + goto out; + } + + ret = _omap_rproc_suspend(rproc); + if (ret) { + dev_err(dev, "suspend failed %d\n", ret); + goto out; + } + + rproc->state = RPROC_SUSPENDED; +out: + mutex_unlock(&rproc->lock); + return ret; +} + +static int __maybe_unused omap_rproc_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rproc *rproc = platform_get_drvdata(pdev); + int ret = 0; + + mutex_lock(&rproc->lock); + if (rproc->state == RPROC_OFFLINE) + goto out; + + if (rproc->state != RPROC_SUSPENDED) { + ret = -EBUSY; + goto out; + } + + ret = _omap_rproc_resume(rproc); + if (ret) { + dev_err(dev, "resume failed %d\n", ret); + goto out; + } + + rproc->state = RPROC_RUNNING; +out: + mutex_unlock(&rproc->lock); + return ret; +} +#endif /* CONFIG_PM */ + static const struct omap_rproc_dev_data omap4_dsp_dev_data = { .device_name = "dsp", .fw_name = "omap4-dsp-fw.xe64T", @@ -806,6 +972,14 @@ static int omap_rproc_probe(struct platform_device *pdev) oproc->num_timers); } + init_completion(&oproc->pm_comp); + + oproc->fck = of_clk_get(np, 0); + if (IS_ERR(oproc->fck)) { + ret = PTR_ERR(oproc->fck); + goto free_rproc; + } + ret = of_reserved_mem_device_init(&pdev->dev); if (ret) { dev_err(&pdev->dev, "device does not have specific CMA pool\n"); @@ -823,6 +997,7 @@ static int omap_rproc_probe(struct platform_device *pdev) release_mem: of_reserved_mem_device_release(&pdev->dev); free_rproc: + clk_put(oproc->fck); rproc_free(rproc); return ret; } @@ -838,11 +1013,16 @@ static int omap_rproc_remove(struct platform_device *pdev) return 0; } +static const struct dev_pm_ops omap_rproc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(omap_rproc_suspend, omap_rproc_resume) +}; + static struct platform_driver omap_rproc_driver = { .probe = omap_rproc_probe, .remove = omap_rproc_remove, .driver = { .name = "omap-rproc", + .pm = &omap_rproc_pm_ops, .of_match_table = omap_rproc_of_match, }, }; diff --git a/drivers/remoteproc/omap_remoteproc.h b/drivers/remoteproc/omap_remoteproc.h index 18f522617683..e44458634608 100644 --- a/drivers/remoteproc/omap_remoteproc.h +++ b/drivers/remoteproc/omap_remoteproc.h @@ -2,7 +2,7 @@ /* * Remote processor messaging * - * Copyright (C) 2011 Texas Instruments, Inc. + * Copyright (C) 2011-2018 Texas Instruments, Inc. * Copyright (C) 2011 Google, Inc. * All rights reserved. */ @@ -32,6 +32,16 @@ * @RP_MBOX_ABORT_REQUEST: a "please crash" request, used for testing the * recovery mechanism (to some extent). * + * @RP_MBOX_SUSPEND_AUTO: auto suspend request for the remote processor + * + * @RP_MBOX_SUSPEND_SYSTEM: system suspend request for the remote processor + * + * @RP_MBOX_SUSPEND_ACK: successful response from remote processor for a + * suspend request + * + * @RP_MBOX_SUSPEND_CANCEL: a cancel suspend response from a remote processor + * on a suspend request + * * Introduce new message definitions if any here. * * @RP_MBOX_END_MSG: Indicates end of known/defined messages from remote core @@ -45,7 +55,11 @@ enum omap_rp_mbox_messages { RP_MBOX_ECHO_REQUEST = 0xFFFFFF03, RP_MBOX_ECHO_REPLY = 0xFFFFFF04, RP_MBOX_ABORT_REQUEST = 0xFFFFFF05, - RP_MBOX_END_MSG = 0xFFFFFF06, + RP_MBOX_SUSPEND_AUTO = 0xFFFFFF10, + RP_MBOX_SUSPEND_SYSTEM = 0xFFFFFF11, + RP_MBOX_SUSPEND_ACK = 0xFFFFFF12, + RP_MBOX_SUSPEND_CANCEL = 0xFFFFFF13, + RP_MBOX_END_MSG = 0xFFFFFF14, }; #endif /* _OMAP_RPMSG_H */