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From:   Kalle Valo <kvalo@kernel.org>
To:     fckath@web.de
Cc:     linux-wireless@vger.kernel.org, ath11k@lists.infradead.org
Subject: Re: ath11k and the 32 MSI problem
References: <trinity-f503010b-028a-4c52-a368-56b3e6a1e645-1642429792868@3c-app-webde-bap30>
Date:   Mon, 17 Jan 2022 16:48:49 +0200
In-Reply-To: <trinity-f503010b-028a-4c52-a368-56b3e6a1e645-1642429792868@3c-app-webde-bap30>
        (fckath's message of "Mon, 17 Jan 2022 15:29:52 +0100")
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(adding ath11k list)

fckath@web.de writes:

> Hello world;
> =C2=A0
> I've got a bunch of M.2 Type A/E Wifi 6e cards from Emwicon (WMX7205)
> and Sparklan (WNFQ-268AXI(BT)) wirth Qualcomm WCN6856 chips.
> =C2=A0
> I'd like to use them on DFI AL553 3.5" SBCs with ATOM E3940 processor
> (https://www.dfi.com/de/product/index/1409), but I was hit by the
> error message "failed to get 32 MSI vectors, only -28 available". Ok,
> it seems that the Atom E3900 does not support VT-d. I managed to get
> these card working on standard PCs with i7 and i5 with active VT-d.
> However, when disabling VT-d in the BIOS I get the same behaviour as
> on the Atom boards.
>
> I tried the single MSI patch on
> https://wireless.wiki.kernel.org/en/users/drivers/ath11k but failed to
> apply these patches to an 5.15.0 kernel from Debian backports.
>
> Are there
>  - patches for 5.15 or 5.16?
>  - patched drivers for 5.15 or 5.16?
>  - information where to find a matching driver source on which the patche=
s will apply?

The support for one MSI vectors will be in v5.17-rc1, which should be
released next Sunday. The feature is already on Linus' tree.

IIRC you need these commits, in case you want to backport them:

e94b07493da3 ath11k: Set IRQ affinity to CPU0 in case of one MSI vector
915a081ff307 ath11k: do not restore ASPM in case of single MSI vector
ac6e73483f7b ath11k: add support one MSI vector
c41a6700b276 ath11k: refactor multiple MSI vector implementation
4ab4693f327a ath11k: use ATH11K_PCI_IRQ_DP_OFFSET for DP IRQ
01279bcd01d9 ath11k: add CE and ext IRQ flag to indicate irq_handler
87b4072d7ef8 ath11k: get msi_data again after request_irq is called
081e2d6476e3 ath11k: add hw_param for wakeup_mhi

--=20
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatc=
hes