Re: [PATCH] arm: Enlarge IO_SPACE_LIMIT needed for some SoC

[Russell King - ARM Linux admin]

On Tue, May 11, 2021 at 02:15:21PM +0200, Ansuel Smith wrote:
> 0000:01:00.0 Network controller: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network Adapter
>         Subsystem: Qualcomm Atheros Device cafe
>         Device tree node: /sys/firmware/devicetree/base/soc/pci@1b500000/bridge@0,0/wifi@1,0
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin A routed to IRQ 53
>         Region 0: Memory at 08000000 (64-bit, non-prefetchable) [size=2M]

It seems this Atheros device does not make any use of I/O, so this
device should be fine.

> 0001:01:00.0 Network controller: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network Adapter
>         Subsystem: Qualcomm Atheros Device cafe
>         Device tree node: /sys/firmware/devicetree/base/soc/pci@1b700000/bridge@0,0/wifi@1,0
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin A routed to IRQ 54
>         Region 0: Memory at 2e000000 (64-bit, non-prefetchable) [size=2M]

This device also seems to not make use of any I/O.

I don't see any reason probing of these two drivers should fail if
there is no or reduced I/O space.

Please can you share the kernel messages so we can see exactly what is
failing and how?

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