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Wed, 04 Nov 2026 07:38:28 -0800 (PST) Received: from [192.168.100.182] ([182.180.105.19]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b43c17ecdasm89849875e9.5.2026.11.04.07.38.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Nov 2026 07:38:27 -0800 (PST) Message-ID: <496706c6-e15c-43ab-ae0f-6230e098dfb2@gmail.com> Date: Wed, 4 Nov 2026 20:38:23 +0500 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] PCI: spacemit: Ignore PERST# bit for controllers To: Troy Mitchell , Bjorn Helgaas , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , linux-pci@vger.kernel.org Cc: Rob Herring , Yixun Lan , Ping-Ke Shih , Anirudh Srinivasan , Alex Elder , Vladimir Oltean , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig_=28The_Capable_Hub=29?= , Pengpeng Hou , "open list:RISC-V SPACEMIT SoC Support" , "open list:RISC-V SPACEMIT SoC Support" , open list References: <20261104140750.761330-1-alitariq45892@gmail.com> Content-Language: en-US From: Ali Tariq In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261104_073830_897731_E15C86F7 X-CRM114-Status: GOOD ( 12.16 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-riscv" X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 11/4/26 7:14 PM, Troy Mitchell wrote: > On Wed Nov 4, 2026 at 2:07 PM GMT, Ali Tariq wrote: >> The k1_pcie_init() does not set PCIE_IGNORE_PERSTN bit of the >> control logic register, which causes controller to reset itself once >> PERST# signal is asserted even when acting as host. >> On Orange Pi RV2 (SpacemiT K1), this resets the controller and wipes >> the IDs. k1_pcie_deinit() leaves PERST# asserted, so when k1_pcie_init() >> runs again, its first DBI access hangs the CPU. >> >> Set PCIE_IGNORE_PERSTN bit of the control logic register of APMU >> in k1_pcie_init() before enabling resources so controllers >> dont end up resetting themselves when PERST# signal is asserted. >> >> Fixes: ff64e078e45f ("PCI: spacemit: Add SpacemiT PCIe host driver") >> Signed-off-by: Ali Tariq >> --- >> Hang log: https://kernelci.cloud-v.co/scheduler/job/420 >> Fixed Log: https://kernelci.cloud-v.co/scheduler/job/430 >> --- >> drivers/pci/controller/dwc/pcie-spacemit-k1.c | 9 +++++++++ >> 1 file changed, 9 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-spacemit-k1.c b/drivers/pci/controller/dwc/pcie-spacemit-k1.c >> index 92a71ea90ac3..af6028e8825a 100644 >> --- a/drivers/pci/controller/dwc/pcie-spacemit-k1.c >> +++ b/drivers/pci/controller/dwc/pcie-spacemit-k1.c >> @@ -47,6 +47,7 @@ >> >> #define PCIE_CONTROL_LOGIC 0x0004 >> #define PCIE_SOFT_RESET BIT(0) >> +#define PCIE_IGNORE_PERSTN BIT(2) /* 1: ignore PERST# */ > A similar but earlier patch can be found here [1] > > Link: https://lore.kernel.org/all/20260924-spacemit-k1-pcie-fix-v1-1-002b5c1ba9fc@linux.spacemit.com/ [1] > Thank you for pointing. I missed that. I will check that patch. You can drop my patch. Regards, Ali _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=74.125.225.137 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793806710; b=E7taOEIN1fd6SxmFOQPs+rZ46Mv3b/BHSdZ7HFsL98Fpb6uMqgYvCwrgdYQ7+31fa1cD 6+ovn3NNRv/jhlfrHXtNp+crI4BrnBJCSPAblJYUkqg7Vs2OOv6VGcNf487kTR8B1vK3X NH5aYbIHnyDruOZXJ7u3udy/x5eiwRcM42VTDY2MmGfClP0joGVz99YyRVSIQknaMiPB+ HTTT5SzVEhMIhKDN+EDhltAxT7pFVhrdKl5jXHvdJd1gPEOddaG5rLCXt5pE3Mw0qx9Aq 6uzvZzIVkl4ZWGM1IsK6YERu2ZlDVlZWqm1D67TfHbrOnIx3uyHMiKfk/FAXTMD0efg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793806710; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: Message-ID:Date:MIME-Version:User-Agent:Subject:To:Cc:References: Content-Language:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; 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Wed, 04 Nov 2026 07:38:28 -0800 (PST) Received: from [192.168.100.182] ([182.180.105.19]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b43c17ecdasm89849875e9.5.2026.11.04.07.38.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Nov 2026 07:38:27 -0800 (PST) Message-ID: <496706c6-e15c-43ab-ae0f-6230e098dfb2@gmail.com> Date: Wed, 4 Nov 2026 20:38:23 +0500 X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] PCI: spacemit: Ignore PERST# bit for controllers To: Troy Mitchell , Bjorn Helgaas , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , linux-pci@vger.kernel.org Cc: Rob Herring , Yixun Lan , Ping-Ke Shih , Anirudh Srinivasan , Alex Elder , Vladimir Oltean , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig_=28The_Capable_Hub=29?= , Pengpeng Hou , "open list:RISC-V SPACEMIT SoC Support" , "open list:RISC-V SPACEMIT SoC Support" , open list References: <20261104140750.761330-1-alitariq45892@gmail.com> Content-Language: en-US From: Ali Tariq In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/4/26 7:14 PM, Troy Mitchell wrote: > On Wed Nov 4, 2026 at 2:07 PM GMT, Ali Tariq wrote: >> The k1_pcie_init() does not set PCIE_IGNORE_PERSTN bit of the >> control logic register, which causes controller to reset itself once >> PERST# signal is asserted even when acting as host. >> On Orange Pi RV2 (SpacemiT K1), this resets the controller and wipes >> the IDs. k1_pcie_deinit() leaves PERST# asserted, so when k1_pcie_init() >> runs again, its first DBI access hangs the CPU. >> >> Set PCIE_IGNORE_PERSTN bit of the control logic register of APMU >> in k1_pcie_init() before enabling resources so controllers >> dont end up resetting themselves when PERST# signal is asserted. >> >> Fixes: ff64e078e45f ("PCI: spacemit: Add SpacemiT PCIe host driver") >> Signed-off-by: Ali Tariq >> --- >> Hang log: https://kernelci.cloud-v.co/scheduler/job/420 >> Fixed Log: https://kernelci.cloud-v.co/scheduler/job/430 >> --- >> drivers/pci/controller/dwc/pcie-spacemit-k1.c | 9 +++++++++ >> 1 file changed, 9 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-spacemit-k1.c b/drivers/pci/controller/dwc/pcie-spacemit-k1.c >> index 92a71ea90ac3..af6028e8825a 100644 >> --- a/drivers/pci/controller/dwc/pcie-spacemit-k1.c >> +++ b/drivers/pci/controller/dwc/pcie-spacemit-k1.c >> @@ -47,6 +47,7 @@ >> >> #define PCIE_CONTROL_LOGIC 0x0004 >> #define PCIE_SOFT_RESET BIT(0) >> +#define PCIE_IGNORE_PERSTN BIT(2) /* 1: ignore PERST# */ > A similar but earlier patch can be found here [1] > > Link: https://lore.kernel.org/all/20260924-spacemit-k1-pcie-fix-v1-1-002b5c1ba9fc@linux.spacemit.com/ [1] > Thank you for pointing. I missed that. I will check that patch. You can drop my patch. Regards, Ali