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boundary=781b55b6c1a4b8d869ac8afe61faab8498bc4cbf4cf36fd0c52106658e40; micalg=pgp-sha512; protocol="application/pgp-signature" Date: Wed, 04 Nov 2026 14:14:14 +0000 Message-Id: Cc: "Rob Herring" , "Yixun Lan" , "Troy Mitchell" , "Ping-Ke Shih" , "Anirudh Srinivasan" , "Alex Elder" , "Vladimir Oltean" , =?utf-8?b?VXdlIEtsZWluZS1Lw7ZuaWcgKFRoZSBDYXBhYmxlIEh1Yik=?= , "Pengpeng Hou" , "open list:RISC-V SPACEMIT SoC Support" , "open list:RISC-V SPACEMIT SoC Support" , "open list" Subject: Re: [PATCH] PCI: spacemit: Ignore PERST# bit for controllers From: "Troy Mitchell" To: "Ali Tariq" , "Bjorn Helgaas" , "Lorenzo Pieralisi" , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , "Manivannan Sadhasivam" , X-Mailer: aerc 0.21.0-reader-ipc4 References: <20261104140750.761330-1-alitariq45892@gmail.com> In-Reply-To: <20261104140750.761330-1-alitariq45892@gmail.com> X-QQ-SENDSIZE: 520 Feedback-ID: zesmtpsz:linux.spacemit.com:qybglogicsvrgz:qybglogicsvrgz3a-0 X-QQ-XMAILINFO: MMP68wjQN2EwNcNLqNECurWnKOmMv96dvv8GQWQep79nn3kixqaepqiT ZEmTss6b5P52V3gxN+xhin5F7PsUEx8k0Xy94SQ8FYlhFyA5YflgzKn+IuqK295fbcknUaY sFmV+I8xWQfZVJwbOYD2ZT6uZAN5bmrAuTEd+QJ/isi8XWoTbfvXp5CMqN3ifZrARdnp60k Ud7T/VBB6O+vUWnmb0w+3cYj6zM1MDHVi1GaoRUvzMsnZ/ns3hufifI+uluLJnXNL4QJuTI yBhAfSK7sSC8hwD8ft25+hx5xpUqD2KTngZxndhTWxlizk0WUXi0UJl9L3U9TRpWCYoUMPb tWOGTJ3kydL0p+7IDIeAEy0Fdx83CKwa7FkrvR21cA4AOiPRCT/8In56rETj6X0IbdDy83n tqkzkCwLsApSZfE96Me3ybKdf01mwMIbYLyBKipefsgUu9l49gylEjrFtGjfkx2o0pmYXN7 GgKF+DZTx86yXkOvc1TeeqKKflotPoSMU/vfsUa2lkoA70nPYFkmshNfhU3klTtpLbq299y u6X7BkUbnOTkhJszE6yk481XuNJRXkvVbq3ZGw3hv93wC3mfMiblMWT8oO6h+FnyZnea6te IeVfsZSwi+D8FeO/vbrjzCWzWnrASDmB94IF8/9aj9bMMNNG9HqNxDI4xsnz+e6qN4NwdRe V/2bGSDe1k0rxbyGFFfELmX/cz4GWxNR0liVK+tQAw3zIMd9L6gmBlQ+PbdMLKfeKio/e0C CFMvj4tyzYBB68iKcFRRC6gFYHzMBQBJJDfnV00Dml/ogw1wSQEk3F9uRLCCMPEtcC4j4k2 CopQnQhkg6FNHsyRABlh7zLWMEzwqgtM8N2cQyRxJnQ9sEnmMRooMBtWPz7R6Kdc7exsjPT ElEu/ACm70RSkRW5WhtJ6QlE1rGE0krZFZIyxRZO4GIHbgwIMtOUgLMflkYld/q3CCh4RUV JGz0Xbt/T0p4lnCxKT0FDy17lDc4ADwXIr/rtY9R9dwFjAmBlOJ3yQAJ5KZVDBUcAYrYAEv yUMxSkh1qhUx9rDgrtTfrAZ+51avtALrdVg2hHb5hEglO2zHVU0QzfcsYtHZJ0ux6TObG+j k7rwONrzoTXYECjnx1HXPn9VDDgycQOCA== X-QQ-XMRINFO: NI4Ajvh11aEjEMj13RCX7UuhPEoou2bs1g== X-QQ-RECHKSPAM: 0 --781b55b6c1a4b8d869ac8afe61faab8498bc4cbf4cf36fd0c52106658e40 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 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 @@ > =20 > #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-v1-1-002b5c= 1ba9fc@linux.spacemit.com/ [1] --=20 Troy Mitchell --781b55b6c1a4b8d869ac8afe61faab8498bc4cbf4cf36fd0c52106658e40 Content-Type: application/pgp-signature; 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Wed, 04 Nov 2026 14:15:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.spacemit.com; s=mxsw2412; t=1793801659; bh=YRFzX9U45u392R6CS3S9srqLygNa9Vb4srT2gSOpYyY=; h=Mime-Version:Date:Message-Id:Subject:From:To; b=M9wjH8KaPJl5odAg4TcCw1vuqIexC9g/6N/vFvVvPwhIvmeQxBQ/8IM6inUzsRGh/ Sso9I9ilFIpK45stJzrONuEYLnouAQr3gmnY7H20RzfY5UIjtgvZJCRoZKe/JddQZ6 TRDtyb6sxqySu6IB/2cOXrNzll/2aowUxnGblGaA= X-QQ-mid: zesmtpsz3t1793801657t27ae4659 X-QQ-Originating-IP: VHZFg6dY0HEn9gNaE2tnlCiu8hVYZVO1me2iozeib+M= Received: from = ( [120.237.158.181]) by bizesmtp.qq.com (ESMTP) with id ; Wed, 04 Nov 2026 22:14:15 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 14208902309344038913 EX-QQ-RecipientCnt: 18 X-Archived-By: Mime-Version: 1.0 Date: Wed, 04 Nov 2026 14:14:14 +0000 Message-Id: Cc: "Rob Herring" , "Yixun Lan" , "Troy Mitchell" , "Ping-Ke Shih" , "Anirudh Srinivasan" , "Alex Elder" , "Vladimir Oltean" , =?utf-8?b?VXdlIEtsZWluZS1Lw7ZuaWcgKFRoZSBDYXBhYmxlIEh1Yik=?= , "Pengpeng Hou" , "open list:RISC-V SPACEMIT SoC Support" , "open list:RISC-V SPACEMIT SoC Support" , "open list" Subject: Re: [PATCH] PCI: spacemit: Ignore PERST# bit for controllers From: "Troy Mitchell" To: "Ali Tariq" , "Bjorn Helgaas" , "Lorenzo Pieralisi" , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , "Manivannan Sadhasivam" , X-Mailer: aerc 0.21.0-reader-ipc4 References: <20261104140750.761330-1-alitariq45892@gmail.com> In-Reply-To: <20261104140750.761330-1-alitariq45892@gmail.com> X-QQ-SENDSIZE: 520 Feedback-ID: zesmtpsz:linux.spacemit.com:qybglogicsvrgz:qybglogicsvrgz3a-0 X-QQ-XMAILINFO: M78R9KLJLU4Ir4N9hic/C7wRpgZUCL5hTYegqO3BeYHPW3EzDzHjPRwW xMQaIHM528usNPb4+olAHvN3OETVGBpmBVVqjIPGenlwYVcUy24m6XIgr4EPHGmxT4Z8/D2 NgcNsUrY49J1S9X+lPYuU4/E5935VgAsT4fRN0SmizbDR/Mc6VszxuF9ov64sCewN+KXN1F RK1Rya9TqxJiDPvdhxs/ZMz8hIIAx/+fq3G0yoPxWYF4ElrSKQeS+jA6b7wETX/ftBMKAxh gnX4Q2NaAd5a1/tthsH3XevuCWBKywhYxd1BA3lLRiS8VKxHi6LHqxu0LdXavGQJjYpZlFh vElug5daMpouZknruAmKYMzfIA8HotiRoZ1miRjVa5TE+OQrXTdKIADkvii1sidOvo09GnX E3aGtLoxrOs3VC1Rlb80QojVWAV9mjvFnS1/tugVtfikqyJne2EAwJ0bnlP50Bgp42BUbyk QRB/GAgwh2IT2/+JG1jk88xltTz2rYDpBLaTqMGvn8PdzglmAgBiCpGkKeR0v6a2GJ85VGY CL+2xTlAqSDNpVYekMu24yIeNvQ9Tnmd0cYa23JTtBwzYJLrTK0i1iKKyxx5GbHmmXRr6SN /1IaZblFUgFL1cKH6ghhXMSTrn+f1lOF6mhMHDot/JgETyulZe31Z68XEappkNeqedBBzcS wjWADP6XJ5MuCQD+dyOoz2CMkxbmaJU3Sj2oIKZgmOIK1n+Ztez8sqi2I0hGPglLCKGIvF6 ehZHP8jCMpNnwuuL9y0+UwHKnt2x07donwqqwqZIyw1kri26jq3dQNPWLSyuf8O6Zam3+lM 5uwt+nOS7drhqDd+OqnS/S4OQZzI7lSHEMrjcEbG+uMGM3kTiwZULfg+oNUSygNRe2AYxui +bzLIiZKGtY7xnhFOYIp4c7fek4uCgd7EkalFWgsSd45Swq48ve+BHC618eFpBb3cvHV4/H OanC2RKJ3FV6n+ROq+fxZQ+JuVUlTajB5P33YcG27RhM1ZeflAvc7y1oJVjCp80u8gjXk7p 5KkpS+JKOjiCKdIysCJjHoN8u2qWtxJnPGfS2EXFsXr79tZgag4yo6eBD0W3jeAzFB+0Ftd zF/ByPe5HiQiJ0q7uYUWDgh7QnDOaJgOg== X-QQ-XMRINFO: OWPUhxQsoeAVwkVaQIEGSKwwgKCxK/fD5g== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261104_061506_842948_17929BE1 X-CRM114-Status: GOOD ( 14.52 ) X-Spam-Score: -2.1 (--) 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-Type: multipart/mixed; boundary="===============7002295488366859294==" Sender: "linux-riscv" X-Spam-Status: No, score=-13.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 --===============7002295488366859294== Content-Type: multipart/signed; boundary=781b55b6c1a4b8d869ac8afe61faab8498bc4cbf4cf36fd0c52106658e40; micalg=pgp-sha512; protocol="application/pgp-signature" --781b55b6c1a4b8d869ac8afe61faab8498bc4cbf4cf36fd0c52106658e40 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 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 @@ > =20 > #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-v1-1-002b5c= 1ba9fc@linux.spacemit.com/ [1] --=20 Troy Mitchell --781b55b6c1a4b8d869ac8afe61faab8498bc4cbf4cf36fd0c52106658e40 Content-Type: application/pgp-signature; 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