linux-kernel - [PATCH AUTOSEL 6.14 494/642] wifi: ath12k: Enable MLO setup ready and teardown commands for single split-phy device

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Message-Id: <20250505221419.2672473-494-sashal@kernel.org>
Date: Mon,  5 May 2025 18:11:50 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Aaradhana Sahu <quic_aarasahu@...cinc.com>,
	Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@....qualcomm.com>,
	Jeff Johnson <jeff.johnson@....qualcomm.com>,
	Sasha Levin <sashal@...nel.org>,
	jjohnson@...nel.org,
	linux-wireless@...r.kernel.org,
	ath12k@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.14 494/642] wifi: ath12k: Enable MLO setup ready and teardown commands for single split-phy device

From: Aaradhana Sahu <quic_aarasahu@...cinc.com>

[ Upstream commit 5cec2d86c7f4242fb30a696d8e6fd48109bf3e8f ]

When multi-link operation(MLO) is enabled through follow-up patches in
the single split-phy device, the firmware expects hardware links
(hw_links) information from the driver.

If driver does not send WMI multi-link setup and ready command to the
firmware during MLO setup for single split-phy device, the firmware will
be unaware of the hw_links component of the multi-link operation. This may
lead to firmware assert during multi-link association.

Therefore, enable WMI setup, ready and teardown commands for single
split-phy PCI device.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Aaradhana Sahu <quic_aarasahu@...cinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@....qualcomm.com>
Link: https://patch.msgid.link/20250207050327.360987-2-quic_aarasahu@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@....qualcomm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/ath12k/core.c | 33 +++++++++++++++++++++++++-
 drivers/net/wireless/ath/ath12k/core.h |  1 +
 drivers/net/wireless/ath/ath12k/mac.c  |  9 +++++++
 3 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
index 212cd935e60a0..ffd173ff7b08c 100644
--- a/drivers/net/wireless/ath/ath12k/core.c
+++ b/drivers/net/wireless/ath/ath12k/core.c
@@ -887,10 +887,41 @@ static void ath12k_core_hw_group_stop(struct ath12k_hw_group *ag)
 	ath12k_mac_destroy(ag);
 }
 
+u8 ath12k_get_num_partner_link(struct ath12k *ar)
+{
+	struct ath12k_base *partner_ab, *ab = ar->ab;
+	struct ath12k_hw_group *ag = ab->ag;
+	struct ath12k_pdev *pdev;
+	u8 num_link = 0;
+	int i, j;
+
+	lockdep_assert_held(&ag->mutex);
+
+	for (i = 0; i < ag->num_devices; i++) {
+		partner_ab = ag->ab[i];
+
+		for (j = 0; j < partner_ab->num_radios; j++) {
+			pdev = &partner_ab->pdevs[j];
+
+			/* Avoid the self link */
+			if (ar == pdev->ar)
+				continue;
+
+			num_link++;
+		}
+	}
+
+	return num_link;
+}
+
 static int __ath12k_mac_mlo_ready(struct ath12k *ar)
 {
+	u8 num_link = ath12k_get_num_partner_link(ar);
 	int ret;
 
+	if (num_link == 0)
+		return 0;
+
 	ret = ath12k_wmi_mlo_ready(ar);
 	if (ret) {
 		ath12k_err(ar->ab, "MLO ready failed for pdev %d: %d\n",
@@ -932,7 +963,7 @@ static int ath12k_core_mlo_setup(struct ath12k_hw_group *ag)
 {
 	int ret, i;
 
-	if (!ag->mlo_capable || ag->num_devices == 1)
+	if (!ag->mlo_capable)
 		return 0;
 
 	ret = ath12k_mac_mlo_setup(ag);
diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index ee595794a7aee..6325ac493f82c 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -1084,6 +1084,7 @@ int ath12k_core_resume(struct ath12k_base *ab);
 int ath12k_core_suspend(struct ath12k_base *ab);
 int ath12k_core_suspend_late(struct ath12k_base *ab);
 void ath12k_core_hw_group_unassign(struct ath12k_base *ab);
+u8 ath12k_get_num_partner_link(struct ath12k *ar);
 
 const struct firmware *ath12k_core_firmware_request(struct ath12k_base *ab,
 						    const char *filename);
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 9c3e66dbe0c3b..9123ffab55b52 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -11140,6 +11140,9 @@ static int __ath12k_mac_mlo_setup(struct ath12k *ar)
 		}
 	}
 
+	if (num_link == 0)
+		return 0;
+
 	mlo.group_id = cpu_to_le32(ag->id);
 	mlo.partner_link_id = partner_link_id;
 	mlo.num_partner_links = num_link;
@@ -11169,10 +11172,16 @@ static int __ath12k_mac_mlo_teardown(struct ath12k *ar)
 {
 	struct ath12k_base *ab = ar->ab;
 	int ret;
+	u8 num_link;
 
 	if (test_bit(ATH12K_FLAG_RECOVERY, &ab->dev_flags))
 		return 0;
 
+	num_link = ath12k_get_num_partner_link(ar);
+
+	if (num_link == 0)
+		return 0;
+
 	ret = ath12k_wmi_mlo_teardown(ar);
 	if (ret) {
 		ath12k_warn(ab, "failed to send MLO teardown WMI command for pdev %d: %d\n",
-- 
2.39.5