[PATCH v2] ath10k: qmi: Skip host capability request for Xiaomi Poco F1

[Amit Pundir]

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@xxxxxxxxxx>
---
We dropped this workaround last time in the favor of
a generic dts quirk to skip host cap check. But that
is under under discussion for a while now,
https://lkml.org/lkml/2020/9/25/1119, so resending
this short term workaround for the time being.

v2: ath10k-check complained about a too long line last
    time, so moved the comment to a new line.
    
 drivers/net/wireless/ath/ath10k/qmi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/qmi.c b/drivers/net/wireless/ath/ath10k/qmi.c
index ae6b1f402adf..1c58b0ff1d29 100644
--- a/drivers/net/wireless/ath/ath10k/qmi.c
+++ b/drivers/net/wireless/ath/ath10k/qmi.c
@@ -653,7 +653,9 @@ 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 &&
+	    /* Xiaomi Poco F1 workaround */
+	    !of_machine_is_compatible("xiaomi,beryllium")) {
 		ath10k_err(ar, "host capability request rejected: %d\n", resp.resp.error);
 		ret = -EINVAL;
 		goto out;
-- 
2.7.4