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Message-ID: <AS8PR04MB8676468EE98DDFEAD0D075AC8C7A2@AS8PR04MB8676.eurprd04.prod.outlook.com> Date: Sat, 12 Oct 2024 09:02:28 +0000 From: Hongxing Zhu <hongxing.zhu@....com> To: Stefan Eichenberger <eichest@...il.com>, Frank Li <frank.li@....com> CC: Francesco Dolcini <francesco@...cini.it>, "l.stach@...gutronix.de" <l.stach@...gutronix.de>, "lpieralisi@...nel.org" <lpieralisi@...nel.org>, "kw@...ux.com" <kw@...ux.com>, "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>, "robh@...nel.org" <robh@...nel.org>, "bhelgaas@...gle.com" <bhelgaas@...gle.com>, "shawnguo@...nel.org" <shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>, Francesco Dolcini <francesco.dolcini@...adex.com>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Stefan Eichenberger <stefan.eichenberger@...adex.com> Subject: RE: [PATCH v2] PCI: imx6: Add suspend/resume support for i.MX6QDL > -----Original Message----- > From: Stefan Eichenberger <eichest@...il.com> > Sent: 2024年10月11日 22:36 > To: Frank Li <frank.li@....com> > Cc: Francesco Dolcini <francesco@...cini.it>; Hongxing Zhu > <hongxing.zhu@....com>; l.stach@...gutronix.de; lpieralisi@...nel.org; > kw@...ux.com; manivannan.sadhasivam@...aro.org; robh@...nel.org; > bhelgaas@...gle.com; shawnguo@...nel.org; s.hauer@...gutronix.de; > kernel@...gutronix.de; festevam@...il.com; Francesco Dolcini > <francesco.dolcini@...adex.com>; linux-pci@...r.kernel.org; > linux-arm-kernel@...ts.infradead.org; imx@...ts.linux.dev; > linux-kernel@...r.kernel.org; Stefan Eichenberger > <stefan.eichenberger@...adex.com> > Subject: Re: [PATCH v2] PCI: imx6: Add suspend/resume support for i.MX6QDL > > Hi Frank, > > On Thu, Oct 10, 2024 at 06:45:17PM -0400, Frank Li wrote: > > On Thu, Oct 10, 2024 at 10:11:21PM +0200, Francesco Dolcini wrote: > > > Hello Frank, > > > > > > On Thu, Oct 10, 2024 at 04:01:21PM -0400, Frank Li wrote: > > > > On Wed, Oct 09, 2024 at 03:14:05PM +0200, Stefan Eichenberger wrote: > > > > > From: Stefan Eichenberger <stefan.eichenberger@...adex.com> > > > > > > > > > > The suspend/resume support is broken on the i.MX6QDL platform. > > > > > This patch resets the link upon resuming to recover > > > > > functionality. It shares most of the sequences with other i.MX > > > > > devices but does not touch the critical registers, which might > > > > > break PCIe. This patch addresses the same issue as the following > downstream commit: > > > > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F% > > > > > > 2Fgithub.com%2Fnxp-imx%2Flinux-imx%2Fcommit%2F4e92355e1f79d225ea > > > > > > 842511fcfd42b343b32995&data=05%7C02%7Chongxing.zhu%40nxp.com%7C4 > > > > > > 9cdf8aaeee54cec71c508dcea0215b1%7C686ea1d3bc2b4c6fa92cd99c5c3016 > > > > > > 35%7C0%7C0%7C638642541899874406%7CUnknown%7CTWFpbGZsb3d8eyJWI > joi > > > > > > MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7 > > > > > > C%7C%7C&sdata=DQGwcXYy0soCov1Uf4ycLQiisP8qlbBzOslyX3FY5Cs%3D&res > > > > > erved=0 In comparison this patch will also reset the device if > > > > > possible. Without this patch suspend/resume will not work if a > > > > > PCIe device is connected. > > > > > The kernel will hang on resume and print an error: > > > > > ath10k_pci 0000:01:00.0: Unable to change power state from D3hot > > > > > to D0, device inaccessible > > > > > 8<--- cut here --- > > > > > Unhandled fault: imprecise external abort (0x1406) at 0x0106f944 > > > > > > > > > > Signed-off-by: Stefan Eichenberger > > > > > <stefan.eichenberger@...adex.com> > > > > > --- > > > > > > > > Thank you for your patch. > > > > > > > > But it may conflict with another suspend/resume patch > > > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2F > > > > lore.kernel.org%2Fimx%2F1727245477-15961-8-git-send-email-hongxing > > > > .zhu%40nxp.com%2F&data=05%7C02%7Chongxing.zhu%40nxp.com%7C4 > 9cdf8aa > > > > > eee54cec71c508dcea0215b1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0% > 7C > > > > > 0%7C638642541899892894%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA > wMDA > > > > > iLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata > > > > > =xPBKoiWL8IceLlv%2F6lWoqkPWosh%2BRvG8jyA8NjKSsOI%3D&reserved=0 > > > > > > Thanks for the head-up. > > > > > > Do you see any issue with this patch apart that? Because this patch > > > is fixing a crash, so I would expect this to be merged, once ready, > > > and such a series rebased afterward. > > > > > > I am writing this explicitly since you wrote a similar comment on > > > the > > > v1 > > > (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fl > > > ore.kernel.org%2Fall%2FZsNXDq%252FkidZdyhvD%40lizhi-Precision-Tower- > > > > 5810%2F&data=05%7C02%7Chongxing.zhu%40nxp.com%7C49cdf8aaeee54cec > 71c5 > > > > 08dcea0215b1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63864 > 25418 > > > > 99904634%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2l > uMzI > > > > iLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=x2OVvZsi4YIxSg > KGD > > > 7ZzqbRQjiTFK4%2BzMdgDv2qSdig%3D&reserved=0) > > > and I would like to prevent to have this fix starving for long just > > > because multiple people is working on the same driver. > > > > My key comment for this patch is use flags IMX_PCIE_FLAG_SKIP_TURN_OFF > > in suspend()/resume(), it is up to kw to pick which one firstly. > > I will try to implement it as you proposed with the new flag. > > However, what I figured out with kernel v6.12-rc1 I get the following warning > when booting on an i.MX6QDL even without my patch applied: > [ 1.901199] PCI: bus0: Fast back to back transfers disabled > [ 1.904754] mmc1: SDHCI controller on 2190000.mmc [2190000.mmc] > using ADMA > [ 1.904914] mmc2: SDHCI controller on 2194000.mmc [2194000.mmc] > using ADMA > [ 1.910686] pci 0000:01:00.0: [168c:003c] type 00 class 0x028000 PCIe > Endpoint > [ 1.918390] NET: Registered PF_PACKET protocol family > [ 1.918573] mmc0: SDHCI controller on 2198000.mmc [2198000.mmc] > using ADMA > [ 1.924322] pci 0000:01:00.0: BAR 0 [mem 0x00000000-0x001fffff 64bit] > [ 1.931635] Key type dns_resolver registered > [ 1.936764] pci 0000:01:00.0: ROM [mem 0x00000000-0x0000ffff pref] > [ 1.961043] pci 0000:01:00.0: supports D1 D2 > [ 1.961526] Registering SWP/SWPB emulation handler > [ 1.965601] mmc0: new DDR MMC card at address 0001 > [ 1.976575] mmcblk0: mmc0:0001 Q2J54A 3.59 GiB > [ 1.979794] Loading compiled-in X.509 certificates > [ 1.985036] PCI: bus1: Fast back to back transfers disabled > [ 1.991531] pci 0000:00:00.0: bridge window [mem 0x01000000-0x011fffff]: > assigned > [ 1.998742] mmcblk0: p1 p2 p3 > [ 1.999163] pci 0000:00:00.0: BAR 0 [mem 0x01200000-0x012fffff]: > assigned > [ 2.003947] mmcblk0boot0: mmc0:0001 Q2J54A 16.0 MiB > [ 2.008990] pci 0000:00:00.0: bridge window [mem 0x01300000-0x013fffff > pref]: assigned > [ 2.009023] pci 0000:00:00.0: ROM [mem 0x01400000-0x0140ffff pref]: > assigned > [ 2.009054] pci 0000:01:00.0: BAR 0 [mem 0x01000000-0x011fffff 64bit]: > assigned > [ 2.017526] mmcblk0boot1: mmc0:0001 Q2J54A 16.0 MiB > [ 2.022015] pci 0000:01:00.0: ROM [mem 0x01300000-0x0130ffff pref]: > assigned > [ 2.032133] mmcblk0rpmb: mmc0:0001 Q2J54A 512 KiB, chardev (242:0) > [ 2.036347] pci 0000:00:00.0: PCI bridge to [bus 01-ff] > [ 2.036370] pci 0000:00:00.0: bridge window [mem > 0x01000000-0x011fffff] > [ 2.036384] pci 0000:00:00.0: bridge window [mem > 0x01300000-0x013fffff pref] > [ 2.042552] pps pps0: new PPS source ptp0 > [ 2.048338] pci_bus 0000:00: resource 4 [io 0x0000-0xffff] > [ 2.083626] pci_bus 0000:00: resource 5 [mem 0x01000000-0x01efffff] > [ 2.089972] pci_bus 0000:01: resource 1 [mem 0x01000000-0x011fffff] > [ 2.093461] fec 2188000.ethernet eth0: registered PHC device 0 > [ 2.096283] pci_bus 0000:01: resource 2 [mem 0x01300000-0x013fffff pref] > [ 2.096352] sysfs: cannot create duplicate filename > '/devices/platform/soc/1ffc000.pcie/pci0000:00/0000:00:00.0/resource0' > [ 2.096365] CPU: 3 UID: 0 PID: 52 Comm: kworker/u19:2 Not tainted > 6.12.0-rc1 #54 > [ 2.096381] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) > [ 2.096391] Workqueue: async async_run_entry_fn > [ 2.103025] imx_thermal 20c8000.anatop:tempmon: Industrial CPU > temperature grade - max:105C critical:100C passive:95C > [ 2.108932] > [ 2.108940] Call trace: > [ 2.108950] unwind_backtrace from show_stack+0x10/0x14 > [ 2.121391] clk: Disabling unused clocks > [ 2.127423] show_stack from dump_stack_lvl+0x54/0x68 > [ 2.127451] dump_stack_lvl from sysfs_warn_dup+0x58/0x64 > [ 2.134265] PM: genpd: Disabling unused power domains > [ 2.138525] sysfs_warn_dup from sysfs_add_bin_file_mode_ns+0xbc/0xcc > [ 2.138547] sysfs_add_bin_file_mode_ns from > sysfs_create_bin_file+0xac/0xb4 > [ 2.149242] ALSA device list: > [ 2.150647] sysfs_create_bin_file from > pci_create_resource_files+0x84/0x148 > [ 2.153183] No soundcards found. > [ 2.158407] pci_create_resource_files from > pci_bus_add_device+0x24/0xe4 > [ 2.211699] pci_bus_add_device from pci_bus_add_devices+0x2c/0x70 > [ 2.217930] pci_bus_add_devices from pci_host_probe+0x7c/0xa4 > [ 2.223806] pci_host_probe from dw_pcie_host_init+0x4ec/0x71c > [ 2.229682] dw_pcie_host_init from imx_pcie_probe+0x3a8/0x75c > [ 2.235559] imx_pcie_probe from platform_probe+0x5c/0xb0 > [ 2.241010] platform_probe from really_probe+0xd0/0x3a4 > [ 2.246364] really_probe from __driver_probe_device+0x8c/0x1d4 > [ 2.252321] __driver_probe_device from driver_probe_device+0x30/0xc0 > [ 2.258803] driver_probe_device from > __driver_attach_async_helper+0x50/0xd8 > [ 2.265892] __driver_attach_async_helper from > async_run_entry_fn+0x30/0x144 > [ 2.272980] async_run_entry_fn from process_one_work+0x154/0x2dc > [ 2.279115] process_one_work from worker_thread+0x250/0x3f0 > [ 2.284811] worker_thread from kthread+0x110/0x12c > [ 2.289726] kthread from ret_from_fork+0x14/0x28 > [ 2.294461] Exception stack(0xe6a0dfb0 to 0xe6a0dff8) > [ 2.299535] dfa0: 00000000 > 00000000 00000000 00000000 > [ 2.307740] dfc0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 2.315942] dfe0: 00000000 00000000 00000000 00000000 00000013 > 00000000 > [ 2.323156] pcieport 0000:00:00.0: PME: Signaling with IRQ 293 > [ 2.329645] pcieport 0000:00:00.0: AER: enabled with IRQ 293 > [ 2.335553] sysfs: cannot create duplicate filename > '/devices/platform/soc/1ffc000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/res > ource0' > [ 2.347794] CPU: 3 UID: 0 PID: 52 Comm: kworker/u19:2 Not tainted > 6.12.0-rc1 #54 > [ 2.355229] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) > [ 2.361779] Workqueue: async async_run_entry_fn > [ 2.366349] Call trace: > [ 2.366362] unwind_backtrace from show_stack+0x10/0x14 > [ 2.374183] show_stack from dump_stack_lvl+0x54/0x68 > [ 2.379273] dump_stack_lvl from sysfs_warn_dup+0x58/0x64 > [ 2.384706] sysfs_warn_dup from sysfs_add_bin_file_mode_ns+0xbc/0xcc > [ 2.391183] sysfs_add_bin_file_mode_ns from > sysfs_create_bin_file+0xac/0xb4 > [ 2.398270] sysfs_create_bin_file from > pci_create_resource_files+0x84/0x148 > [ 2.405360] pci_create_resource_files from > pci_bus_add_device+0x24/0xe4 > [ 2.412113] pci_bus_add_device from pci_bus_add_devices+0x2c/0x70 > [ 2.418334] pci_bus_add_devices from pci_bus_add_devices+0x60/0x70 > [ 2.424642] pci_bus_add_devices from pci_host_probe+0x7c/0xa4 > [ 2.430511] pci_host_probe from dw_pcie_host_init+0x4ec/0x71c > [ 2.436384] dw_pcie_host_init from imx_pcie_probe+0x3a8/0x75c > [ 2.442258] imx_pcie_probe from platform_probe+0x5c/0xb0 > [ 2.447704] platform_probe from really_probe+0xd0/0x3a4 > [ 2.453057] really_probe from __driver_probe_device+0x8c/0x1d4 > [ 2.459014] __driver_probe_device from driver_probe_device+0x30/0xc0 > [ 2.465493] driver_probe_device from > __driver_attach_async_helper+0x50/0xd8 > [ 2.472580] __driver_attach_async_helper from > async_run_entry_fn+0x30/0x144 > [ 2.479666] async_run_entry_fn from process_one_work+0x154/0x2dc > [ 2.485800] process_one_work from worker_thread+0x250/0x3f0 > [ 2.491494] worker_thread from kthread+0x110/0x12c > [ 2.496408] kthread from ret_from_fork+0x14/0x28 > [ 2.501140] Exception stack(0xe6a0dfb0 to 0xe6a0dff8) > [ 2.506214] dfa0: 00000000 > 00000000 00000000 00000000 > [ 2.514418] dfc0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 2.522620] dfe0: 00000000 00000000 00000000 00000000 00000013 > 00000000 > > This was not the case with kernel v6.11, do you have an idea where this comes > from? I did not dig into more detail yet but it looks a bit like a regression. The > driver still works, it just prints this duplicate filename warning. Hi Stefan: I use my i.MX6QP SabreSD board to make a quick boot test when both the v6.12-rc2 and v6.12-rc1 are used. Since I don't have the i.MX6QDL board at my hand now. There is no dump, kernel boots successfully, and PCIe works well too. Do I miss something? BTW, the imx_v6_v7_defconfig is used in my tests. root@...6qpdlsolox:~# lspci 00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01) 01:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection root@...6qpdlsolox:~# uname -a Linux imx6qpdlsolox 6.12.0-rc2 #11 SMP Sat Oct 12 16:56:57 CST 2024 armv7l GNU/Linux root@...6qpdlsolox:~# root@...6qpdlsolox:~# root@...6qpdlsolox:~# dmesg | grep pci [ 0.442344] imx6q-pcie 1ffc000.pcie: host bridge /soc/pcie@...c000 ranges: [ 0.442397] imx6q-pcie 1ffc000.pcie: IO 0x0001f80000..0x0001f8ffff -> 0x0000000000 [ 0.442427] imx6q-pcie 1ffc000.pcie: MEM 0x0001000000..0x0001efffff -> 0x0001000000 [ 1.659104] imx6q-pcie 1ffc000.pcie: iATU: unroll F, 4 ob, 4 ib, align 64K, limit 4G [ 1.765277] imx6q-pcie 1ffc000.pcie: PCIe Gen.1 x1 link up [ 1.770809] imx6q-pcie 1ffc000.pcie: Link: Only Gen1 is enabled [ 1.770820] imx6q-pcie 1ffc000.pcie: Link up, Gen1 [ 1.784066] imx6q-pcie 1ffc000.pcie: PCIe Gen.1 x1 link up [ 1.796446] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 [ 1.809095] pci_bus 0000:00: root bus resource [bus 00-ff] [ 1.809113] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] [ 1.809125] pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff] [ 1.822423] pci 0000:00:00.0: [16c3:abcd] type 01 class 0x060400 PCIe Root Port [ 1.822451] pci 0000:00:00.0: BAR 0 [mem 0x00000000-0x000fffff] [ 1.834148] pci 0000:00:00.0: ROM [mem 0x00000000-0x0000ffff pref] [ 1.849760] pci 0000:00:00.0: PCI bridge to [bus 01-ff] [ 1.890183] pci 0000:00:00.0: bridge window [io 0x0000-0x0fff] [ 1.896293] pci 0000:00:00.0: bridge window [mem 0x00000000-0x000fffff] [ 1.903109] pci 0000:00:00.0: bridge window [mem 0x00000000-0x000fffff pref] [ 1.910386] pci 0000:00:00.0: Limiting cfg_size to 512 [ 1.915588] pci 0000:00:00.0: supports D1 [ 1.919638] pci 0000:00:00.0: PME# supported from D0 D1 D3hot D3cold [ 1.944036] pci 0000:01:00.0: [8086:10d3] type 00 class 0x020000 PCIe Endpoint [ 1.951427] pci 0000:01:00.0: BAR 0 [mem 0x00000000-0x0001ffff] [ 1.961171] pci 0000:01:00.0: BAR 1 [mem 0x00000000-0x0007ffff] [ 1.967149] pci 0000:01:00.0: BAR 2 [io 0x0000-0x001f] [ 1.972456] pci 0000:01:00.0: BAR 3 [mem 0x00000000-0x00003fff] [ 1.978528] pci 0000:01:00.0: ROM [mem 0x00000000-0x0003ffff pref] [ 1.985185] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold [ 2.020060] pci 0000:00:00.0: BAR 0 [mem 0x01000000-0x010fffff]: assigned [ 2.032893] pci 0000:00:00.0: bridge window [mem 0x01100000-0x011fffff]: assigned [ 2.046230] pci 0000:00:00.0: bridge window [mem 0x01200000-0x012fffff pref]: assigned [ 2.059918] pci 0000:00:00.0: ROM [mem 0x01300000-0x0130ffff pref]: assigned [ 2.072647] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff]: assigned [ 2.085371] pci 0000:01:00.0: BAR 1 [mem 0x01100000-0x0117ffff]: assigned [ 2.097773] pci 0000:01:00.0: ROM [mem 0x01200000-0x0123ffff pref]: assigned [ 2.112229] pci 0000:01:00.0: BAR 0 [mem 0x01180000-0x0119ffff]: assigned [ 2.112266] pci 0000:01:00.0: BAR 3 [mem 0x011a0000-0x011a3fff]: assigned [ 2.124738] pci 0000:01:00.0: BAR 2 [io 0x1000-0x101f]: assigned [ 2.137379] pci 0000:00:00.0: PCI bridge to [bus 01-ff] [ 2.149485] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff] [ 2.149502] pci 0000:00:00.0: bridge window [mem 0x01100000-0x011fffff] [ 2.160835] pci 0000:00:00.0: bridge window [mem 0x01200000-0x012fffff pref] [ 2.173722] pci_bus 0000:00: resource 4 [io 0x0000-0xffff] [ 2.193124] pci_bus 0000:00: resource 5 [mem 0x01000000-0x01efffff] [ 2.193139] pci_bus 0000:01: resource 0 [io 0x1000-0x1fff] [ 2.222093] pci_bus 0000:01: resource 1 [mem 0x01100000-0x011fffff] [ 2.228389] pci_bus 0000:01: resource 2 [mem 0x01200000-0x012fffff pref] Best Regards Richard Zhu > > Regards, > Stefan
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