linux-kernel - Re: [PATCH] ath10k: qmi: Skip host capability request for Xiaomi Poco F1

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Date:   Sat, 26 Sep 2020 00:02:33 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        David S Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Konrad Dybcio <konradybcio@...il.com>,
        ath10k <ath10k@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH] ath10k: qmi: Skip host capability request for Xiaomi Poco F1

On Fri, 25 Sep 2020 at 20:57, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Thu 24 Sep 11:31 CDT 2020, Kalle Valo wrote:
>
> > Amit Pundir <amit.pundir@...aro.org> writes:
> >
> > > Workaround to get WiFi working on Xiaomi Poco F1 (sdm845)
> > > phone. We get a non-fatal QMI_ERR_MALFORMED_MSG_V01 error
> > > message in ath10k_qmi_host_cap_send_sync(), but we can still
> > > bring up WiFi services successfully on AOSP if we ignore it.
> > >
> > > We suspect either the host cap is not implemented or there
> > > may be firmware specific issues. Firmware version is
> > > QC_IMAGE_VERSION_STRING=WLAN.HL.2.0.c3-00257-QCAHLSWMTPLZ-1
> > >
> > > qcom,snoc-host-cap-8bit-quirk didn't help. If I use this
> > > quirk, then the host capability request does get accepted,
> > > but we run into fatal "msa info req rejected" error and
> > > WiFi interface doesn't come up.
> > >
> > > Attempts are being made to debug the failure reasons but no
> > > luck so far. Hence this device specific workaround instead
> > > of checking for QMI_ERR_MALFORMED_MSG_V01 error message.
> > > Tried ath10k/WCN3990/hw1.0/wlanmdsp.mbn from the upstream
> > > linux-firmware project but it didn't help and neither did
> > > building board-2.bin file from stock bdwlan* files.
> > >
> > > This workaround will be removed once we have a viable fix.
> > > Thanks to postmarketOS guys for catching this.
> > >
> > > Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> >
> > Bjorn, is this ok to take?
> >
>
> As I wrote in the answer to Amit I think we should introduce a generic
> quirk to skip host_cap instead.
>
> So if you pick this up (which is an ok short term workaround) I think we
> should revert it once we have a generic mechanism.

Hi Bjorn, just sent out a generic skip quirk for review.

Regards,
Amit Pundir

>
> Regards,
> Bjorn
>
> > > --- a/drivers/net/wireless/ath/ath10k/qmi.c
> > > +++ b/drivers/net/wireless/ath/ath10k/qmi.c
> > > @@ -651,7 +651,8 @@ static int ath10k_qmi_host_cap_send_sync(struct ath10k_qmi *qmi)
> > >
> > >     /* older FW didn't support this request, which is not fatal */
> > >     if (resp.resp.result != QMI_RESULT_SUCCESS_V01 &&
> > > -       resp.resp.error != QMI_ERR_NOT_SUPPORTED_V01) {
> > > +       resp.resp.error != QMI_ERR_NOT_SUPPORTED_V01 &&
> > > +       !of_machine_is_compatible("xiaomi,beryllium")) { /* Xiaomi Poco F1 workaround */
> > >             ath10k_err(ar, "host capability request rejected: %d\n", resp.resp.error);
> >
> > ath10k-check complained about a too long line, so in the pending branch
> > I moved the comment before the if statement.
> >
> > --
> > https://patchwork.kernel.org/project/linux-wireless/list/
> >
> > https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches