Subject: Re: [PATCH] ath10k: qmi: Skip host capability request for Xiaomi Poco F1

From: Bjorn Andersson <[email-masked]>
Date: Thu, 17 Sep 2020 11:05:13 -0500

On Thu 17 Sep 02:41 CDT 2020, Amit Pundir wrote:

> 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.
> 

What happens if you skip sending the host-cap message? I had one
firmware version for which I implemented a
"qcom,snoc-host-cap-skip-quirk".

But testing showed that the link was pretty unusable - pushing any real
amount of data would cause it to silently stop working - and I realized
that I could use the linux-firmware wlanmdsp.mbn instead, which works
great on all my devices...

> 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.
> 

"Didn't work" as in the wlanmdsp.mbn from linux-firmware failed to load
or some laer problem?

Regards,
Bjorn

> This workaround will be removed once we have a viable fix.
> Thanks to postmarketOS guys for catching this.
> 
> Signed-off-by: Amit Pundir <[email-masked]>
> ---
> Device-tree for Xiaomi Poco F1(Beryllium) got merged in
> qcom/arm64-for-5.10 last week
> https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?id=77809cf74a8c
> 
>  drivers/net/wireless/ath/ath10k/qmi.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/ath10k/qmi.c b/drivers/net/wireless/ath/ath10k/qmi.c
> index 0dee1353d395..37c5350eb8b1 100644
> --- 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);
>  		ret = -EINVAL;
>  		goto out;
> -- 
> 2.7.4
>