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Thu, 03 Jun 2021 21:05:07 +0000 Received: from mail-pj1-f45.google.com ([209.85.216.45]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1louWU-00AXvP-Ts for linux-arm-kernel@lists.infradead.org; Thu, 03 Jun 2021 21:05:05 +0000 Received: by mail-pj1-f45.google.com with SMTP id g24so4366995pji.4 for ; Thu, 03 Jun 2021 14:03:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to; bh=PIBx8aAFMd1W7c+QooSqwrGakNQ7jN7B4XPe3NhTaAw=; b=Kyn8jKB9vrc8r0w/NE9WKk7ZNSI02D8pyCcPzrv29SreUo9fLOjk1Bi9bcrlLTejhy kh+4oxk8sm+f6Ihax5zBxiAmSmTmSu4c6UIemz8IRflmVVLifzJFyU3pQPs4d5zg/Y3w v/EH7qHetywd9QYKRt8z2Q2Kn/CtPsvQGRTRY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to; bh=PIBx8aAFMd1W7c+QooSqwrGakNQ7jN7B4XPe3NhTaAw=; b=Y4z2p6vWJWtob9xd8Gi9EvnXofqOu5MXJiG7MKTCOjE4qUIDP4XwRnkWhJAY3uapZk Wa1RWIWGlN/Eifzc9QVU3tHqtl7+nvtdYdksRkJ4RWBkfkiHTK5wgUFSuH11FN6ZBC9J w4/Wn3uUuWU/Qfwnstf7czMNa19mEbkWaAiYtYoBgS7pI0aKvSJYzbFYc+8pS6dGwumF yhXCIT0luxAvBriWbPWxsWI5NVZdMA/INicCJK4moIdUOn0tnNi17P//bIDkrrPGKdOm UC258qiXL3Pp7jcMoZnssb/VVIch257MIRneRFHBt8JAG2F21RhOuPzofhAbvSpIEi// kclg== X-Gm-Message-State: AOAM533jvqwZV1iQ96AkV7DTn4dSUsR2by9wQXiaEE0euZVPt21aCOcj 6yWPb4TWuuPjKeAx9NRdqRKYcw== X-Google-Smtp-Source: ABdhPJywnwhp//iwv1gF5kd5/fql9uctBp/xIpZxKVU0EgSl4LONc/dww6FseLVsVEZIVu1ouCEyBw== X-Received: by 2002:a17:90b:3e89:: with SMTP id rj9mr1174641pjb.114.1622754117955; Thu, 03 Jun 2021 14:01:57 -0700 (PDT) Received: from [10.67.49.104] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id z15sm17080pgu.71.2021.06.03.14.01.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Jun 2021 14:01:56 -0700 (PDT) Subject: Re: [PATCH v1 4/4] PCI: brcmstb: add shutdown call to driver To: Bjorn Helgaas , Florian Fainelli Cc: Jim Quinlan , linux-pci@vger.kernel.org, Bjorn Helgaas , Nicolas Saenz Julienne , bcm-kernel-feedback-list@broadcom.com, james.quinlan@broadcom.com, Nicolas Saenz Julienne , Lorenzo Pieralisi , Rob Herring , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , open list References: <20210603205841.GA2139914@bjorn-Precision-5520> From: Florian Fainelli Message-ID: Date: Thu, 3 Jun 2021 14:01:53 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <20210603205841.GA2139914@bjorn-Precision-5520> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210603_140502_988899_CAF22386 X-CRM114-Status: GOOD ( 24.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============7400083971349722388==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============7400083971349722388== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000f6aa2305c3e2e292" --000000000000f6aa2305c3e2e292 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 6/3/21 1:58 PM, Bjorn Helgaas wrote: > On Thu, Jun 03, 2021 at 10:30:37AM -0700, Florian Fainelli wrote: >> On 6/3/21 10:23 AM, Bjorn Helgaas wrote: >>> On Wed, May 26, 2021 at 10:03:47AM -0700, Florian Fainelli wrote: >>>> On 5/25/21 2:18 PM, Bjorn Helgaas wrote: >>>>> On Tue, Apr 27, 2021 at 01:51:39PM -0400, Jim Quinlan wrote: >>>>>> The shutdown() call is similar to the remove() call except the former does >>>>>> not need to invoke pci_{stop,remove}_root_bus(), and besides, errors occur >>>>>> if it does. >>>>> >>>>> This doesn't explain why shutdown() is necessary. "errors occur" >>>>> might be a hint, except that AFAICT, many similar drivers do invoke >>>>> pci_stop_root_bus() and pci_remove_root_bus() (several of them while >>>>> holding pci_lock_rescan_remove()), without implementing .shutdown(). >>>> >>>> We have to implement .shutdown() in order to meet a certain power budget >>>> while the chip is being put into S5 (soft off) state and still support >>>> Wake-on-WLAN, for our latest chips this translates into roughly 200mW of >>>> power savings at the wall. We could probably add a word or two in a v2 >>>> that indicates this is done for power savings. >>> >>> "Saving power" is a great reason to do this. But we still need to >>> connect this to the driver model and the system-level behavior >>> somehow. >>> >>> The pci_driver comment says @shutdown is to "stop idling DMA >>> operations" and it hooks into reboot_notifier_list in kernel/sys.c. >>> That's incorrect or at least incomplete because reboot_notifier_list >>> isn't mentioned at all in kernel/sys.c, and I don't see the connection >>> between @shutdown and reboot_notifier_list. >>> >>> AFAICT, @shutdown is currently used in this path: >>> >>> kernel_restart_prepare or kernel_shutdown_prepare >>> device_shutdown >>> dev->bus->shutdown >>> pci_device_shutdown # pci_bus_type.shutdown >>> drv->shutdown >>> >>> so we're going to either reboot or halt/power-off the entire system, >>> and we're not going to use this device again until we're in a >>> brand-new kernel and we re-enumerate the device and re-register the >>> driver. >>> >>> I'm not quite sure how either of those fits into the power-saving >>> reason. I guess going to S5 is probably via the kernel_power_off() >>> path and that by itself doesn't turn off as much power to the PCIe >>> controller as it could? And this new .shutdown() method will get >>> called in that path and will turn off more power, but will still leave >>> enough for wake-on-LAN to work? And when we *do* wake from S5, >>> obviously that means a complete boot with a new kernel. >> >> Correct, the S5 shutdown is via kernel_power_off() and will turn off all >> that we can in the PCIe root complex and its PHY, drop the PCIe link to >> the end-point which signals that the end-point can enter its own suspend >> logic, too. And yes, when we do wake-up from S5 it means booting a >> completely new kernel. S5 is typically implemented in our chips by >> keeping just a little bit of logic active to service wake-up events >> (infrared remotes, GPIOs, RTC, etc.). > > Which part of that does this patch change? Is it that the new > .shutdown() turns off more power than machine_power_off() does by > itself? Yes, with pcie-brcmstb.c providing a .shutdow() callback we have a chance to turn off our PCIe PHY and the RC's digital clock which would not be able to do otherwise. -- Florian --000000000000f6aa2305c3e2e292 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQeQYJKoZIhvcNAQcCoIIQajCCEGYCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3QMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t 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