[PATCH v2 2/3] ath10k: Introduce a devicetree quirk to skip host cap QMI requests

[David Heidelberg via B4 Relay <devnull+david.ixit.cz@kernel.org>]

From: Amit Pundir <amit.pundir@linaro.org>

There are firmware versions which do not support host capability
QMI request. We suspect either the host cap is not implemented or
there may be firmware specific issues, but apparently there seem
to be a generation of firmware that has this particular behavior.

For example, firmware build on Xiaomi Poco F1 (sdm845) phone:
"QC_IMAGE_VERSION_STRING=WLAN.HL.2.0.c3-00257-QCAHLSWMTPLZ-1"

If we do not skip the host cap QMI request on Poco F1, then we
get a QMI_ERR_MALFORMED_MSG_V01 error message in the
ath10k_qmi_host_cap_send_sync(). But this error message is not
fatal to the firmware nor to the ath10k driver and we can still
bring up the WiFi services successfully if we just ignore it.

Hence introducing this DeviceTree quirk to skip host capability
QMI request for the firmware versions which do not support this
feature.

Suggested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/net/wireless/ath/ath10k/qmi.c  | 13 ++++++++++---
 drivers/net/wireless/ath/ath10k/snoc.c |  3 +++
 drivers/net/wireless/ath/ath10k/snoc.h |  1 +
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/qmi.c b/drivers/net/wireless/ath/ath10k/qmi.c
index 8275345631a0b..ba5ab942e7ef8 100644
--- a/drivers/net/wireless/ath/ath10k/qmi.c
+++ b/drivers/net/wireless/ath/ath10k/qmi.c
@@ -808,6 +808,7 @@ ath10k_qmi_ind_register_send_sync_msg(struct ath10k_qmi *qmi)
 static void ath10k_qmi_event_server_arrive(struct ath10k_qmi *qmi)
 {
 	struct ath10k *ar = qmi->ar;
+	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
 	int ret;
 
 	ret = ath10k_qmi_ind_register_send_sync_msg(qmi);
@@ -819,9 +820,15 @@ static void ath10k_qmi_event_server_arrive(struct ath10k_qmi *qmi)
 		return;
 	}
 
-	ret = ath10k_qmi_host_cap_send_sync(qmi);
-	if (ret)
-		return;
+	/*
+	 * Skip the host capability request for the firmware versions which
+	 * do not support this feature.
+	 */
+	if (!test_bit(ATH10K_SNOC_FLAG_SKIP_HOST_CAP_QUIRK, &ar_snoc->flags)) {
+		ret = ath10k_qmi_host_cap_send_sync(qmi);
+		if (ret)
+			return;
+	}
 
 	ret = ath10k_qmi_msa_mem_info_send_sync_msg(qmi);
 	if (ret)
diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index b3f6424c17d36..4def51cac2ed5 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -1346,6 +1346,9 @@ static void ath10k_snoc_quirks_init(struct ath10k *ar)
 
 	if (of_property_read_bool(dev->of_node, "qcom,snoc-host-cap-8bit-quirk"))
 		set_bit(ATH10K_SNOC_FLAG_8BIT_HOST_CAP_QUIRK, &ar_snoc->flags);
+
+	if (of_property_read_bool(dev->of_node, "qcom,snoc-host-cap-skip-quirk"))
+		set_bit(ATH10K_SNOC_FLAG_SKIP_HOST_CAP_QUIRK, &ar_snoc->flags);
 }
 
 int ath10k_snoc_fw_indication(struct ath10k *ar, u64 type)
diff --git a/drivers/net/wireless/ath/ath10k/snoc.h b/drivers/net/wireless/ath/ath10k/snoc.h
index d4bce17076960..403f35af34c5d 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.h
+++ b/drivers/net/wireless/ath/ath10k/snoc.h
@@ -50,6 +50,7 @@ enum ath10k_snoc_flags {
 	ATH10K_SNOC_FLAG_MODEM_STOPPED,
 	ATH10K_SNOC_FLAG_RECOVERY,
 	ATH10K_SNOC_FLAG_8BIT_HOST_CAP_QUIRK,
+	ATH10K_SNOC_FLAG_SKIP_HOST_CAP_QUIRK,
 };
 
 struct clk_bulk_data;

-- 
2.51.0