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Wed, 28 Apr 2021 14:03:02 -0700 (PDT) Subject: Re: [PATCH v5 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller To: Bjorn Helgaas , Jim Quinlan Cc: Jim Quinlan , linux-pci@vger.kernel.org, Nicolas Saenz Julienne , bcm-kernel-feedback-list@broadcom.com, Florian Fainelli , Hans de Goede , Jens Axboe , Jim Quinlan , linux-arm-kernel@lists.infradead.org, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, Lorenzo Pieralisi , Rob Herring , Amjad Ouled-Ameur , Philipp Zabel References: <20210428205319.GA429792@bjorn-Precision-5520> From: Florian Fainelli Message-ID: Date: Wed, 28 Apr 2021 14:03:00 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210428205319.GA429792@bjorn-Precision-5520> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org On 4/28/2021 1:53 PM, Bjorn Helgaas wrote: > [+cc Amjad, Philipp: possible issue with 557acb3d2cd9 ("reset: make > shared pulsed reset controls re-triggerable") below; report at > https://lore.kernel.org/linux-ide/20210428200058.GA366202@bjorn-Precision-5520/] > > On Wed, Apr 28, 2021 at 04:34:00PM -0400, Jim Quinlan wrote: >> On Wed, Apr 28, 2021 at 4:01 PM Bjorn Helgaas wrote: >>> On Fri, Mar 12, 2021 at 03:45:53PM -0500, Jim Quinlan wrote: >>>> v5 -- Improved (I hope) commit description (Bjorn). >>>> -- Rnamed error labels (Krzyszt). >>>> -- Fixed typos. >>>> >>>> v4 -- does not rely on a pending commit, unlike v3. >>>> >>>> v3 -- discard commit from v2; instead rely on the new function >>>> reset_control_rearm provided in a recent commit [1] applied >>>> to reset/next. >>>> -- New commit to correct pcie-brcmstb.c usage of a reset controller >>>> to use reset/rearm verses deassert/assert. >>>> >>>> v2 -- refactor rescal-reset driver to implement assert/deassert rather than >>>> reset because the reset call only fires once per lifetime and we need >>>> to reset after every resume from S2 or S3. >>>> -- Split the use of "ahci" and "rescal" controllers in separate fields >>>> to keep things simple. >>>> >>>> v1 -- original >>>> >>>> Jim Quinlan (2): >>>> ata: ahci_brcm: Fix use of BCM7216 reset controller >>>> PCI: brcmstb: Use reset/rearm instead of deassert/assert >>>> >>>> drivers/ata/ahci_brcm.c | 46 +++++++++++++-------------- >>>> drivers/pci/controller/pcie-brcmstb.c | 19 +++++++---- >>>> 2 files changed, 36 insertions(+), 29 deletions(-) >>> >>> Tripped over these errors while build testing with the .config below. >>> This is on the pci/brcmstb branch from >>> git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git >>> >>> Dropping the pci/brcmstb branch while we get this figured out. This will >>> remove the following commits: >>> >>> a24fd1d6469f ("PCI: brcmstb: Use reset/rearm instead of deassert/assert") >>> 92b9cb55a9b6 ("ata: ahci_brcm: Fix use of BCM7216 reset controller") >>> b5d9209d5083 ("PCI: brcmstb: Fix error return code in brcm_pcie_probe()") >> >> Hi Bjorn, >> >> I believe the problem is that the commit >> >> 557acb3d2cd9c82de19f944f6cc967a347735385 >> "reset: make shared pulsed reset controls re-triggerable" >> >> defined reset_control_rearm() for the CONFIG_RESET_CONTROLLER=y case >> but forgot to define an empty function for the unset case. Your test >> .config has this CONFIG unset. >> >> Would you like me to resubmit this with an additional commit that >> fixes this? > > The fix could be a patch along those lines, or it could be a Kconfig > change that makes this config impossible. I didn't look deeper to see > what makes sense. But I don't think the fix should be "manually avoid > this configuration." > > It looks like 557acb3d2cd9 ("reset: make shared pulsed reset controls > re-triggerable") appeared in v5.11, so if a patch is the right thing, > it should probably be marked for stable ("v5.11+"). All of the other reset controller API have inline stubs when CONFIG_RESET_CONTROLLER is disabled, not having one for reset_control_rearm() seems like an oversight (easy to make since if you introduce the API you obviously needed it and did not consider the case where it may not be available). I agree this would be stable material. -- Florian From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.2 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 115EDC433B4 for ; Wed, 28 Apr 2021 21:04:47 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 36BD361418 for ; Wed, 28 Apr 2021 21:04:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 36BD361418 Authentication-Results: mail.kernel.org; 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Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210428205319.GA429792@bjorn-Precision-5520> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210428_140304_710438_AF991136 X-CRM114-Status: GOOD ( 26.97 ) 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 4/28/2021 1:53 PM, Bjorn Helgaas wrote: > [+cc Amjad, Philipp: possible issue with 557acb3d2cd9 ("reset: make > shared pulsed reset controls re-triggerable") below; report at > https://lore.kernel.org/linux-ide/20210428200058.GA366202@bjorn-Precision-5520/] > > On Wed, Apr 28, 2021 at 04:34:00PM -0400, Jim Quinlan wrote: >> On Wed, Apr 28, 2021 at 4:01 PM Bjorn Helgaas wrote: >>> On Fri, Mar 12, 2021 at 03:45:53PM -0500, Jim Quinlan wrote: >>>> v5 -- Improved (I hope) commit description (Bjorn). >>>> -- Rnamed error labels (Krzyszt). >>>> -- Fixed typos. >>>> >>>> v4 -- does not rely on a pending commit, unlike v3. >>>> >>>> v3 -- discard commit from v2; instead rely on the new function >>>> reset_control_rearm provided in a recent commit [1] applied >>>> to reset/next. >>>> -- New commit to correct pcie-brcmstb.c usage of a reset controller >>>> to use reset/rearm verses deassert/assert. >>>> >>>> v2 -- refactor rescal-reset driver to implement assert/deassert rather than >>>> reset because the reset call only fires once per lifetime and we need >>>> to reset after every resume from S2 or S3. >>>> -- Split the use of "ahci" and "rescal" controllers in separate fields >>>> to keep things simple. >>>> >>>> v1 -- original >>>> >>>> Jim Quinlan (2): >>>> ata: ahci_brcm: Fix use of BCM7216 reset controller >>>> PCI: brcmstb: Use reset/rearm instead of deassert/assert >>>> >>>> drivers/ata/ahci_brcm.c | 46 +++++++++++++-------------- >>>> drivers/pci/controller/pcie-brcmstb.c | 19 +++++++---- >>>> 2 files changed, 36 insertions(+), 29 deletions(-) >>> >>> Tripped over these errors while build testing with the .config below. >>> This is on the pci/brcmstb branch from >>> git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git >>> >>> Dropping the pci/brcmstb branch while we get this figured out. This will >>> remove the following commits: >>> >>> a24fd1d6469f ("PCI: brcmstb: Use reset/rearm instead of deassert/assert") >>> 92b9cb55a9b6 ("ata: ahci_brcm: Fix use of BCM7216 reset controller") >>> b5d9209d5083 ("PCI: brcmstb: Fix error return code in brcm_pcie_probe()") >> >> Hi Bjorn, >> >> I believe the problem is that the commit >> >> 557acb3d2cd9c82de19f944f6cc967a347735385 >> "reset: make shared pulsed reset controls re-triggerable" >> >> defined reset_control_rearm() for the CONFIG_RESET_CONTROLLER=y case >> but forgot to define an empty function for the unset case. Your test >> .config has this CONFIG unset. >> >> Would you like me to resubmit this with an additional commit that >> fixes this? > > The fix could be a patch along those lines, or it could be a Kconfig > change that makes this config impossible. I didn't look deeper to see > what makes sense. But I don't think the fix should be "manually avoid > this configuration." > > It looks like 557acb3d2cd9 ("reset: make shared pulsed reset controls > re-triggerable") appeared in v5.11, so if a patch is the right thing, > it should probably be marked for stable ("v5.11+"). All of the other reset controller API have inline stubs when CONFIG_RESET_CONTROLLER is disabled, not having one for reset_control_rearm() seems like an oversight (easy to make since if you introduce the API you obviously needed it and did not consider the case where it may not be available). I agree this would be stable material. -- Florian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel