Alas! I spoke to seen. The seeming "workaround" only lasted for one
boot, and after that, the ~180 seconds delay is back to stay, although
the Intel IOMMU is still disabled.
So this issue is "sporadic". Maybe even a race condition... :(
And maybe not even related to the intel-lpss driver: The line:
"intel-lpss 0000:00:15.0: enabling device (0000 -> 0002)"
seems to come from drivers/pci/setup-res.c:
if (cmd != old_cmd) {
dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
So it just enables the PCI device, which at some point leads to
drivers/mfd/intel-lpss.c#intel_lpss_probe() being called which requests
the DMA module leading to drivers/dma/idma64.c#idma64_probe() being
called which finally outputs:
dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
So a lot of code between these two log lines:
[ 6.439056] intel-lpss 0000:00:15.0: enabling device (0000 -> 0002)
[ 187.141427] idma64 idma64.0: Found Intel integrated DMA 64-bit
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https://bugs.launchpad.net/bugs/1973167
Title:
linux-image-4.15.0-177-generic freezes on the welcome screen
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