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From:   Amit Pundir <amit.pundir@linaro.org>
To:     Kalle Valo <kvalo@codeaurora.org>,
        David S Miller <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Cc:     John Stultz <john.stultz@linaro.org>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Konrad Dybcio <konradybcio@gmail.com>,
        ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
        netdev@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH] ath10k: qmi: Skip host capability request for Xiaomi Poco F1
Date:   Thu, 17 Sep 2020 13:11:41 +0530
Message-Id: <1600328501-8832-1-git-send-email-amit.pundir@linaro.org>
Author: Amit Pundir <amit.pundir@linaro.org>
Precedence: bulk

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@linaro.org>
---
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