On Thu, Aug 29, 2024 at 6:50 PM Hongxing Zhu <hongxing.zhu@xxxxxxx> wrote: > > > -----Original Message----- > > From: Bjorn Helgaas <helgaas@xxxxxxxxxx> > > Sent: 2024年8月30日 5:23 > > To: tharvey@xxxxxxxxxxxxx; Hongxing Zhu <hongxing.zhu@xxxxxxx>; Lucas > > Stach <l.stach@xxxxxxxxxxxxxx> > > Cc: linux-pci@xxxxxxxxxxxxxxx > > Subject: Re: legacy PCI device behind a bridge not getting a valid IRQ on imx > > host controller > > > > [+cc Richard, Lucas, maintainers of IMX6 PCI] > > > > On Wed, Aug 28, 2024 at 02:40:33PM -0700, Tim Harvey wrote: > > > Greetings, > > > > > > I have a user that is using an IMX8MM SoC (dwc controller) with a > > > miniPCIe card that has a PEX8112 PCI-to-PCIe bridge to a legacy PCI > > > device and the device is not getting a valid interrupt. > > > > Does pci-imx6.c support INTx at all? > > > i.MX PCIe RC supports INTx. > Add pci=nomsi into kernel command line, can verify it when one endpoint > device is connected. > Based i.MX8MM EVK board and on NVME, MSI or INTx are enabled. > logs of MSI: > root@imx8_all:~# lspci > 00:00.0 PCI bridge: Synopsys, Inc. Device abcd (rev 01) > 01:00.0 Non-Volatile memory controller: Device 1e49:0021 (rev 01) > root@imx8_all:~# cat /proc/interrupts | grep MSI > 221: 0 0 0 0 PCI-MSI 0 Edge PCIe PME > 222: 14 0 0 0 PCI-MSI 524288 Edge nvme0q0 > 223: 382 0 0 0 PCI-MSI 524289 Edge nvme0q1 > 224: 115 0 0 0 PCI-MSI 524290 Edge nvme0q2 > 225: 521 0 0 0 PCI-MSI 524291 Edge nvme0q3 > 226: 53 0 0 0 PCI-MSI 524292 Edge nvme0q4 > Richard, off topic but I've seen in the IMX8MMRM a claim that it supports MSI-X but I have not seen this to be the case as you are showing above with an nvme that would clearly use MSI-X if available. Does the IMX8MM hardware support MSI-X? Best Regards, Tim
