Hello, As suggested by Marc, I'm trying to adapt drivers/pci/host/pcie-altera-msi.c to my platform. Here are my changes to the existing driver: diff --git a/drivers/pci/host/pcie-altera-msi.c b/drivers/pci/host/pcie-altera-msi.c index 4e5d628e8cd4..914cd26b2a53 100644 --- a/drivers/pci/host/pcie-altera-msi.c +++ b/drivers/pci/host/pcie-altera-msi.c @@ -18,6 +18,7 @@ * this program. If not, see <http://www.gnu.org/licenses/>. */ +#define DEBUG 42 #include <linux/interrupt.h> #include <linux/irqchip/chained_irq.h> #include <linux/init.h> @@ -31,7 +32,11 @@ #define MSI_STATUS 0x0 #define MSI_ERROR 0x4 +#if 0 #define MSI_INTMASK 0x8 +#else +#define MSI_INTMASK 0x20 +#endif #define MAX_MSI_VECTORS 32 @@ -51,12 +56,19 @@ struct altera_msi { static inline void msi_writel(struct altera_msi *msi, const u32 value, const u32 reg) { + printk("%s: reg=%u val=0x%x\n", __func__, reg, value); writel_relaxed(value, msi->csr_base + reg); } static inline u32 msi_readl(struct altera_msi *msi, const u32 reg) { +#if 0 return readl_relaxed(msi->csr_base + reg); +#else + u32 val = readl_relaxed(msi->csr_base + reg); + printk("%s: reg=%u val=0x%x\n", __func__, reg, val); + return val; +#endif } static void altera_msi_isr(struct irq_desc *desc) @@ -68,14 +80,19 @@ static void altera_msi_isr(struct irq_desc *desc) u32 bit; u32 virq; + printk("%s: ENTER\n", __func__); chained_irq_enter(chip, desc); msi = irq_desc_get_handler_data(desc); num_of_vectors = msi->num_of_vectors; while ((status = msi_readl(msi, MSI_STATUS)) != 0) { for_each_set_bit(bit, &status, msi->num_of_vectors) { +#if 0 /* Dummy read from vector to clear the interrupt */ readl_relaxed(msi->vector_base + (bit * sizeof(u32))); +#else + msi_writel(msi, bit, MSI_STATUS); +#endif virq = irq_find_mapping(msi->inner_domain, bit); if (virq) @@ -103,7 +120,11 @@ static void altera_msi_isr(struct irq_desc *desc) static void altera_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) { struct altera_msi *msi = irq_data_get_irq_chip_data(data); +#if 0 phys_addr_t addr = msi->vector_phy + (data->hwirq * sizeof(u32)); +#else + phys_addr_t addr = 0x8000000 + 0x2e07c; +#endif msg->address_lo = lower_32_bits(addr); msg->address_hi = upper_32_bits(addr); @@ -247,6 +268,7 @@ static int altera_msi_probe(struct platform_device *pdev) return PTR_ERR(msi->csr_base); } +#if 0 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vector_slave"); msi->vector_base = devm_ioremap_resource(&pdev->dev, res); @@ -256,6 +278,10 @@ static int altera_msi_probe(struct platform_device *pdev) } msi->vector_phy = res->start; +#else + msi->vector_base = (void *)0xdeedbeef; + msi->vector_phy = 0xdeadbeef; +#endif if (of_property_read_u32(np, "num-vectors", &msi->num_of_vectors)) { dev_err(&pdev->dev, "failed to parse the number of vectors\n"); @@ -276,6 +302,8 @@ static int altera_msi_probe(struct platform_device *pdev) irq_set_chained_handler_and_data(msi->irq, altera_msi_isr, msi); platform_set_drvdata(pdev, msi); + printk("%s: res=%pr irq=%d ret=%d\n", __func__, res, msi->irq, ret); + return 0; err: Here are the relevant DT nodes: msi0: msi@2e080 { compatible = "altr,msi-1.0"; reg = <0x2e080 0x40>; reg-names = "csr"; interrupt-parent = <&irq0>; interrupts = <55 IRQ_TYPE_LEVEL_HIGH>; msi-controller; num-vectors = <32>; }; pcie@50000000 { compatible = "sigma,smp8759-pcie"; reg = <0x50000000 0x8000000>; device_type = "pci"; bus-range = <0x0 0x7f>; #size-cells = <2>; #address-cells = <3>; #interrupt-cells = <1>; /* BUS_ADDRESS(3) CPU_PHYSICAL(1) SIZE(2) */ ranges = <0x02000000 0x0 0x8000000 0x58000000 0x0 0x8000000>; msi-parent = <&msi0>; }; Here are the relevant boot-time logs I see: [ 0.392199] altera_msi_probe: res=[mem 0x0002e080-0x0002e0bf flags 0x200] irq=22 ret=0 ... [ 0.993868] OF: PCI: host bridge /soc/pcie@50000000 ranges: [ 0.999582] OF: PCI: Parsing ranges property... [ 1.004250] OF: PCI: MEM 0x58000000..0x5fffffff -> 0x08000000 [ 1.011770] pci_tango 50000000.pcie: ECAM at [mem 0x50000000-0x57ffffff] for [bus 00-7f] [ 1.020190] pci_tango 50000000.pcie: PCI host bridge to bus 0000:00 [ 1.026604] pci_bus 0000:00: root bus resource [bus 00-7f] [ 1.032226] pci_bus 0000:00: root bus resource [mem 0x58000000-0x5fffffff] (bus address [0x08000000-0x0fffffff]) [ 1.042553] pci_bus 0000:00: scanning bus [ 1.046708] pci 0000:00:00.0: [1105:0024] type 01 class 0x048000 [ 1.052861] pci 0000:00:00.0: calling tango_pcie_fixup_class+0x0/0x10 [ 1.059441] tango_config_write: bus=0 where=16 size=4 val=0xffffffff [ 1.065924] tango_config_write: bus=0 where=16 size=4 val=0x4 [ 1.071797] tango_config_write: bus=0 where=20 size=4 val=0xffffffff [ 1.078278] tango_config_write: bus=0 where=20 size=4 val=0x0 [ 1.084155] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x00ffffff 64bit] [ 1.091074] tango_config_write: bus=0 where=56 size=4 val=0xfffff800 [ 1.097554] tango_config_write: bus=0 where=56 size=4 val=0x0 [ 1.103445] pci 0000:00:00.0: calling pci_fixup_ide_bases+0x0/0x40 [ 1.109765] tango_config_write: bus=0 where=82 size=2 val=0x84 [ 1.115744] pci 0000:00:00.0: supports D1 D2 [ 1.120130] pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot [ 1.126261] tango_config_write: bus=0 where=124 size=2 val=0xe008 [ 1.132479] pci 0000:00:00.0: PME# disabled [ 1.136780] tango_config_write: bus=0 where=2096 size=4 val=0x10000000 [ 1.143435] tango_config_write: bus=0 where=2064 size=4 val=0x0 [ 1.149477] tango_config_write: bus=0 where=2052 size=4 val=0x0 [ 1.155658] pci_bus 0000:00: fixups for bus [ 1.159966] tango_config_write: bus=0 where=62 size=2 val=0x21 [ 1.165926] tango_config_write: bus=0 where=4 size=2 val=0x140 [ 1.171884] tango_config_write: bus=0 where=12 size=1 val=0x10 [ 1.177841] PCI: bus0: Fast back to back transfers disabled [ 1.183539] pci 0000:00:00.0: scanning [bus 00-00] behind bridge, pass 0 [ 1.190372] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring [ 1.198513] tango_config_write: bus=0 where=62 size=2 val=0x1 [ 1.204384] tango_config_write: bus=0 where=24 size=4 val=0x0 [ 1.210252] tango_config_write: bus=0 where=62 size=2 val=0x1 [ 1.216122] pci 0000:00:00.0: scanning [bus 00-00] behind bridge, pass 1 [ 1.222951] tango_config_write: bus=0 where=62 size=2 val=0x1 [ 1.228819] tango_config_write: bus=0 where=6 size=2 val=0xffff [ 1.234940] pci_bus 0000:01: busn_res: can not insert [bus 01-ff] under [bus 00-7f] (conflicts with (null) [bus 00-7f]) [ 1.245879] tango_config_write: bus=0 where=24 size=4 val=0xff0100 [ 1.252187] pci_bus 0000:01: scanning bus [ 1.256355] pci 0000:01:00.0: [1912:0014] type 00 class 0x0c0330 [ 1.262509] tango_config_write: bus=1 where=16 size=4 val=0xffffffff [ 1.268994] tango_config_write: bus=1 where=16 size=4 val=0x4 [ 1.274868] tango_config_write: bus=1 where=20 size=4 val=0xffffffff [ 1.281353] tango_config_write: bus=1 where=20 size=4 val=0x0 [ 1.287227] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] [ 1.294154] tango_config_write: bus=1 where=24 size=4 val=0xffffffff [ 1.300638] tango_config_write: bus=1 where=24 size=4 val=0x0 [ 1.306513] tango_config_write: bus=1 where=28 size=4 val=0xffffffff [ 1.312996] tango_config_write: bus=1 where=28 size=4 val=0x0 [ 1.318870] tango_config_write: bus=1 where=32 size=4 val=0xffffffff [ 1.325352] tango_config_write: bus=1 where=32 size=4 val=0x0 [ 1.331226] tango_config_write: bus=1 where=36 size=4 val=0xffffffff [ 1.337708] tango_config_write: bus=1 where=36 size=4 val=0x0 [ 1.343582] tango_config_write: bus=1 where=48 size=4 val=0xfffff800 [ 1.350065] tango_config_write: bus=1 where=48 size=4 val=0x0 [ 1.355953] pci 0000:01:00.0: calling pci_fixup_ide_bases+0x0/0x40 [ 1.362293] tango_config_write: bus=1 where=114 size=2 val=0x86 [ 1.368352] tango_config_write: bus=1 where=146 size=2 val=0x7 [ 1.374370] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold [ 1.380591] tango_config_write: bus=1 where=84 size=2 val=0x8008 [ 1.386723] pci 0000:01:00.0: PME# disabled [ 1.391041] tango_config_write: bus=1 where=272 size=4 val=0x0 [ 1.396999] tango_config_write: bus=1 where=260 size=4 val=0x0 [ 1.403081] tango_config_write: bus=1 where=176 size=2 val=0x0 [ 1.409043] tango_config_write: bus=0 where=144 size=2 val=0x8 [ 1.415001] tango_config_write: bus=0 where=144 size=2 val=0x28 [ 1.429675] pci_bus 0000:01: fixups for bus [ 1.433978] tango_config_write: bus=1 where=4 size=2 val=0x140 [ 1.439937] tango_config_write: bus=1 where=12 size=1 val=0x10 [ 1.445893] PCI: bus1: Fast back to back transfers disabled [ 1.451588] pci_bus 0000:01: bus scan returning with max=01 [ 1.457285] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01 [ 1.464027] tango_config_write: bus=0 where=26 size=1 val=0x1 [ 1.469896] tango_config_write: bus=0 where=62 size=2 val=0x1 [ 1.475764] pci_bus 0000:00: bus scan returning with max=01 [ 1.481460] pci 0000:00:00.0: fixup irq: got 0 [ 1.486018] pci 0000:00:00.0: assigning IRQ 00 [ 1.490574] tango_config_write: bus=0 where=60 size=1 val=0x0 [ 1.496467] pci 0000:01:00.0: fixup irq: got 20 [ 1.501113] pci 0000:01:00.0: assigning IRQ 20 [ 1.505670] tango_config_write: bus=1 where=60 size=1 val=0x14 [ 1.511630] tango_config_write: bus=0 where=28 size=2 val=0xe0f0 [ 1.517760] tango_config_write: bus=0 where=28 size=2 val=0x0 [ 1.523628] tango_config_write: bus=0 where=36 size=4 val=0xffe0fff0 [ 1.530107] tango_config_write: bus=0 where=36 size=4 val=0x0 [ 1.535992] pci 0000:00:00.0: BAR 0: assigned [mem 0x58000000-0x58ffffff 64bit] [ 1.543436] tango_config_write: bus=0 where=4 size=2 val=0x140 [ 1.549391] tango_config_write: bus=0 where=16 size=4 val=0x8000004 [ 1.555782] tango_config_write: bus=0 where=20 size=4 val=0x0 [ 1.561654] tango_config_write: bus=0 where=4 size=2 val=0x140 [ 1.567612] pci 0000:00:00.0: BAR 8: assigned [mem 0x59000000-0x590fffff] [ 1.574534] pci 0000:01:00.0: BAR 0: assigned [mem 0x59000000-0x59001fff 64bit] [ 1.581977] tango_config_write: bus=1 where=4 size=2 val=0x140 [ 1.587932] tango_config_write: bus=1 where=16 size=4 val=0x9000004 [ 1.594326] tango_config_write: bus=1 where=20 size=4 val=0x0 [ 1.600196] tango_config_write: bus=1 where=4 size=2 val=0x140 [ 1.606153] pci 0000:00:00.0: PCI bridge to [bus 01] [ 1.611236] tango_config_write: bus=0 where=48 size=4 val=0xffff [ 1.617365] tango_config_write: bus=0 where=28 size=2 val=0xf0 [ 1.623319] tango_config_write: bus=0 where=48 size=4 val=0x0 [ 1.629188] pci 0000:00:00.0: bridge window [mem 0x59000000-0x590fffff] [ 1.636105] tango_config_write: bus=0 where=32 size=4 val=0x9000900 [ 1.642496] tango_config_write: bus=0 where=44 size=4 val=0x0 [ 1.648363] tango_config_write: bus=0 where=36 size=4 val=0xfff0 [ 1.654491] tango_config_write: bus=0 where=40 size=4 val=0x0 [ 1.660358] tango_config_write: bus=0 where=44 size=4 val=0x0 [ 1.666224] tango_config_write: bus=0 where=62 size=2 val=0x1 [ 1.672142] pcieport 0000:00:00.0: enabling device (0140 -> 0142) [ 1.678364] tango_config_write: bus=0 where=4 size=2 val=0x142 [ 1.684325] tango_config_write: bus=0 where=136 size=2 val=0x2810 [ 1.690549] pcieport 0000:00:00.0: enabling bus mastering [ 1.696068] tango_config_write: bus=0 where=4 size=2 val=0x146 [ 1.702028] tango_config_write: bus=0 where=82 size=2 val=0x84 [ 1.708045] msi_readl: reg=32 val=0xffffffff [ 1.712429] msi_writel: reg=32 val=0xffffffff [ 1.716907] altera-msi 2e080.msi: msi#0 address_hi 0x0 address_lo 0x802e07c [ 1.724001] tango_config_write: bus=0 where=82 size=2 val=0x84 [ 1.729957] tango_config_write: bus=0 where=84 size=4 val=0x802e07c [ 1.736348] tango_config_write: bus=0 where=88 size=4 val=0x0 [ 1.742215] tango_config_write: bus=0 where=92 size=2 val=0x0 [ 1.748096] tango_config_write: bus=0 where=4 size=2 val=0x546 [ 1.754052] tango_config_write: bus=0 where=82 size=2 val=0x85 [ 1.760131] altera-msi 2e080.msi: msi#0 address_hi 0x0 address_lo 0x802e07c [ 1.767214] tango_config_write: bus=0 where=82 size=2 val=0x85 [ 1.773160] tango_config_write: bus=0 where=84 size=4 val=0x802e07c [ 1.779542] tango_config_write: bus=0 where=88 size=4 val=0x0 [ 1.785399] tango_config_write: bus=0 where=92 size=2 val=0x0 [ 1.791303] tango_config_write: bus=0 where=138 size=2 val=0x20 [ 1.797351] tango_config_write: bus=0 where=156 size=2 val=0x0 [ 1.803308] tango_config_write: bus=0 where=2096 size=4 val=0x10000000 [ 1.809966] tango_config_write: bus=0 where=2064 size=4 val=0x0 [ 1.816009] tango_config_write: bus=0 where=2052 size=4 val=0x0 [ 1.822059] tango_config_write: bus=0 where=136 size=2 val=0x281f [ 1.828278] tango_config_write: bus=0 where=2092 size=4 val=0x7 [ 1.834324] aer 0000:00:00.0:pcie002: service driver aer loaded [ 1.840481] pci 0000:01:00.0: calling quirk_usb_early_handoff+0x0/0x7e0 [ 1.847238] pci 0000:01:00.0: enabling device (0140 -> 0142) [ 1.853023] tango_config_write: bus=1 where=4 size=2 val=0x142 [ 1.858989] quirk_usb_handoff_xhci: ioremap(0x59000000, 8192) [ 1.864873] xhci_find_next_ext_cap: offset=0x500 [ 1.869606] val = 0x1000401 ... [ 1.983798] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 1.990375] ehci-pci: EHCI PCI platform driver [ 1.995024] xhci_hcd 0000:01:00.0: enabling bus mastering [ 2.000472] tango_config_write: bus=1 where=4 size=2 val=0x146 [ 2.006355] xhci_hcd 0000:01:00.0: xHCI Host Controller [ 2.011635] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1 [ 2.024640] xhci_find_next_ext_cap: offset=0x500 [ 2.029291] val = 0x1000401 [ 2.032106] xhci_find_next_ext_cap: offset=0x510 [ 2.036758] val = 0x3000502 [ 2.039561] xhci_find_next_ext_cap: offset=0x510 [ 2.044210] val = 0x3000502 [ 2.047020] xhci_find_next_ext_cap: offset=0x524 [ 2.051666] val = 0x2000702 [ 2.054476] xhci_find_next_ext_cap: offset=0x524 [ 2.059122] val = 0x2000702 [ 2.061932] xhci_find_next_ext_cap: offset=0x540 [ 2.066577] val = 0x4c0 [ 2.069029] xhci_find_next_ext_cap: offset=0x550 [ 2.073674] val = 0xa [ 2.075958] xhci_find_next_ext_cap: offset=0x510 [ 2.080604] val = 0x3000502 [ 2.083414] xhci_find_next_ext_cap: offset=0x524 [ 2.088059] val = 0x2000702 [ 2.090880] xhci_hcd 0000:01:00.0: hcc params 0x014051cf hci version 0x100 quirks 0x00000010 [ 2.099377] xhci_hcd 0000:01:00.0: enabling Mem-Wr-Inval [ 2.104722] tango_config_write: bus=1 where=4 size=2 val=0x156 [ 2.110602] tango_config_write: bus=1 where=146 size=2 val=0x7 [ 2.116538] msi_readl: reg=32 val=0xffffffff [ 2.120837] msi_writel: reg=32 val=0xffffffff [ 2.125265] msi_readl: reg=32 val=0xffffffff [ 2.129563] msi_writel: reg=32 val=0xffffffff [ 2.133976] msi_readl: reg=32 val=0xffffffff [ 2.138273] msi_writel: reg=32 val=0xffffffff [ 2.142663] altera-msi 2e080.msi: msi#1 address_hi 0x0 address_lo 0x802e07c [ 2.149672] altera-msi 2e080.msi: msi#2 address_hi 0x0 address_lo 0x802e07c [ 2.156679] altera-msi 2e080.msi: msi#3 address_hi 0x0 address_lo 0x802e07c [ 2.163688] tango_config_write: bus=1 where=146 size=2 val=0xc007 [ 2.169857] tango_config_write: bus=1 where=4 size=2 val=0x546 [ 2.175731] tango_config_write: bus=1 where=146 size=2 val=0x8007 [ 2.181869] altera-msi 2e080.msi: msi#1 address_hi 0x0 address_lo 0x802e07c [ 2.188911] altera-msi 2e080.msi: msi#2 address_hi 0x0 address_lo 0x802e07c [ 2.195942] altera-msi 2e080.msi: msi#3 address_hi 0x0 address_lo 0x802e07c [ 2.203146] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 [ 2.209982] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 2.217251] usb usb1: Product: xHCI Host Controller [ 2.222160] usb usb1: Manufacturer: Linux 4.9.7-1-rc2 xhci-hcd [ 2.228028] usb usb1: SerialNumber: 0000:01:00.0 [ 2.233153] hub 1-0:1.0: USB hub found [ 2.236974] hub 1-0:1.0: 4 ports detected [ 2.241291] xhci_hcd 0000:01:00.0: xHCI Host Controller [ 2.246566] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2 [ 2.300870] xhci_hcd 0000:01:00.0: Host took too long to start, waited 16000 microseconds. [ 2.309196] xhci_hcd 0000:01:00.0: startup error -19 [ 2.314197] xhci_hcd 0000:01:00.0: USB bus 2 deregistered [ 2.319648] xhci_hcd 0000:01:00.0: remove, state 1 [ 2.324481] usb usb1: USB disconnect, device number 1 [ 2.329944] tango_config_write: bus=1 where=146 size=2 val=0x7 [ 2.335827] tango_config_write: bus=1 where=4 size=2 val=0x146 [ 2.341714] msi_readl: reg=32 val=0xffffffff [ 2.346033] msi_writel: reg=32 val=0xfffffffd [ 2.350451] msi_readl: reg=32 val=0xfffffffd [ 2.354751] msi_writel: reg=32 val=0xfffffff9 [ 2.359160] msi_readl: reg=32 val=0xfffffff9 [ 2.363458] msi_writel: reg=32 val=0xfffffff1 [ 2.367940] xhci_hcd 0000:01:00.0: USB bus 1 deregistered [ 2.373407] tango_config_write: bus=1 where=4 size=2 val=0x142 [ 2.379518] usbcore: registered new interface driver usb-storage [ 2.386612] tangox-wdt 1fd00.watchdog: SMP86xx/SMP87xx watchdog registered [ 2.394077] sdhci: Secure Digital Host Controller Interface driver [ 2.400317] sdhci: Copyright(c) Pierre Ossman [ 2.404716] sdhci-pltfm: SDHCI platform and OF driver helper [ 2.410751] NET: Registered protocol family 17 [ 2.415307] Registering SWP/SWPB emulation handler [ 2.435762] Freeing unused kernel memory: 10240K (c0600000 - c1000000) # /usr/sbin/lspci -v 00:00.0 PCI bridge: Sigma Designs, Inc. Device 0024 (rev 01) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Memory at 58000000 (64-bit, non-prefetchable) [size=16M] Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 00000000-00000fff Memory behind bridge: 09000000-090fffff Prefetchable memory behind bridge: 00000000-000fffff Capabilities: [50] MSI: Enable+ Count=1/4 Maskable- 64bit+ Capabilities: [78] Power Management version 3 Capabilities: [80] Express Root Port (Slot-), MSI 03 Capabilities: [100] Virtual Channel Capabilities: [800] Advanced Error Reporting Kernel driver in use: pcieport 01:00.0 USB controller: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller (rev 03) (prog-if 30 [XHCI]) Flags: fast devsel, IRQ 20 Memory at 59000000 (64-bit, non-prefetchable) [size=8K] Capabilities: [50] Power Management version 3 Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+ Capabilities: [90] MSI-X: Enable- Count=8 Masked- Capabilities: [a0] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [150] Latency Tolerance Reporting # cat /proc/interrupts CPU0 CPU1 19: 2728 631 GIC-0 29 Edge twd 20: 471 0 irq0 1 Level serial 25: 0 0 Altera PCIe MSI 0 Edge aerdrv IPI0: 0 0 CPU wakeup interrupts IPI1: 0 0 Timer broadcast interrupts IPI2: 414 1190 Rescheduling interrupts IPI3: 0 34 Function call interrupts IPI4: 0 0 CPU stop interrupts IPI5: 1 0 IRQ work interrupts IPI6: 0 0 completion interrupts Err: 0 altera_msi_probe reported virq=22 for my platform interrupt 55, thus no error, right? I expected interrupt 55 to appear in the /proc/interrupts output. Is it hidden because of the chaining? Nothing happens when I plug a USB Flash drive, but I suppose that is expected given: [ 2.241291] xhci_hcd 0000:01:00.0: xHCI Host Controller [ 2.246566] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2 [ 2.300870] xhci_hcd 0000:01:00.0: Host took too long to start, waited 16000 microseconds. [ 2.309196] xhci_hcd 0000:01:00.0: startup error -19 [ 2.314197] xhci_hcd 0000:01:00.0: USB bus 2 deregistered [ 2.319648] xhci_hcd 0000:01:00.0: remove, state 1 [ 2.324481] usb usb1: USB disconnect, device number 1 I suppose I need to figure out why. Did anyone spot something obviously wrong? Regards.
