pci_alloc_irq_vectors fails ENOSPC for XPS 13 9310

[Thomas Krause]

Am 19.10.20 um 10:09 schrieb Kalle Valo:
>> some variants of Dell XPS 13 9310 model have a QCA6390 device
> Do you happen to know which models exacly have it? I'm trying to find a
> reasonably priced laptop with QCA6390 from Finland or EU, no luck yet.
> Apparently there was a certain Dell XPS 15 9500 model but it was almost
> 4k EUR.
Dell at least sold the XPS 13 9310 with 32 GB RAM in Germany 
(https://www.dell.com/de-de/shop/laptops/neu-xps-13/spd/xps-13-9310-laptop/cn93212) 
with the QCA6390 device. With around 2300 EUR, this offer is still 
expensive but it's less than the 4000. In the delivery notes they called 
the Wi-Fi card "Killer Wi-Fi 6 AX500-DBS (2 x 2)" (part number 555-BFPF) 
but in the current version of the linked listing this is now "Killer 
Wifi 7 AX500". I'm not sure if the "DBS" part has anything to say.
>
> I had the same problem as well back in the days, for me enabling
> CONFIG_IRQ_REMAP helped. If it helps for you also I wonder if we should
> mention that in the ath11k warning above :)

CONFIG_IRQ_REMAP did not do the trick. I noticed that the Wi-Fi card is behind a PCI bridge which is also disabled, could this be a problem?

00:1c.0 PCI bridge: Intel Corporation Device a0b8 (rev 20) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0, IRQ 123
	Bus: primary=00, secondary=56, subordinate=56, sec-latency=0
	I/O behind bridge: [disabled]
	Memory behind bridge: 8c300000-8c3fffff [size=1M]
	Prefetchable memory behind bridge: [disabled]
	Capabilities: [40] Express Root Port (Slot+), MSI 00
	Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [90] Subsystem: Dell Device 0991
	Capabilities: [a0] Power Management version 3
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [220] Access Control Services
	Capabilities: [150] Precision Time Measurement
	Capabilities: [200] L1 PM Substates
	Capabilities: [a00] Downstream Port Containment
	Kernel driver in use: pcieport