linux-kernel - [PATCH 8/8] wifi: ath11k: add support for MHI bandwidth scaling

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Message-Id: <20250217-mhi_bw_up-v1-8-9bad1e42bdb1@oss.qualcomm.com>
Date: Mon, 17 Feb 2025 12:04:15 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Johannes Berg <johannes@...solutions.net>,
        Jeff Johnson <jjohnson@...nel.org>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, mhi@...ts.linux.dev,
        linux-wireless@...r.kernel.org, ath11k@...ts.infradead.org,
        quic_jjohnson@...cinc.com, quic_pyarlaga@...cinc.com,
        quic_vbadigan@...cinc.com, quic_vpernami@...cinc.com,
        quic_mrana@...cinc.com,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Miaoqing Pan <quic_miaoqing@...cinc.com>
Subject: [PATCH 8/8] wifi: ath11k: add support for MHI bandwidth scaling

From: Miaoqing Pan <quic_miaoqing@...cinc.com>

Add support for MHI bandwidth scaling, which will reduce power consumption
if WLAN operates with lower bandwidth. This feature is only enabled for
QCA6390.

Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04546-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1
Signed-off-by: Miaoqing Pan <quic_miaoqing@...cinc.com>
---
 drivers/net/wireless/ath/ath11k/mhi.c | 41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index 6e45f464a429..03cdbe93949a 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -20,6 +20,7 @@
 #define MHI_TIMEOUT_DEFAULT_MS	20000
 #define RDDM_DUMP_SIZE	0x420000
 #define MHI_CB_INVALID	0xff
+#define MHI_BW_SCALE_CHAN_DB 126
 
 static const struct mhi_channel_config ath11k_mhi_channels_qca6390[] = {
 	{
@@ -73,6 +74,17 @@ static struct mhi_event_config ath11k_mhi_events_qca6390[] = {
 		.client_managed = false,
 		.offload_channel = false,
 	},
+	{
+		.num_elements = 8,
+		.irq_moderation_ms = 0,
+		.irq = 1,
+		.mode = MHI_DB_BRST_DISABLE,
+		.data_type = MHI_ER_BW_SCALE,
+		.priority = 2,
+		.hardware_event = false,
+		.client_managed = false,
+		.offload_channel = false,
+	},
 };
 
 static const struct mhi_controller_config ath11k_mhi_config_qca6390 = {
@@ -313,6 +325,33 @@ static void ath11k_mhi_op_write_reg(struct mhi_controller *mhi_cntrl,
 	writel(val, addr);
 }
 
+static int ath11k_mhi_op_get_misc_doorbell(struct mhi_controller *mhi_cntrl,
+					   enum mhi_er_data_type type)
+{
+	if (type == MHI_ER_BW_SCALE)
+		return MHI_BW_SCALE_CHAN_DB;
+
+	return -EINVAL;
+}
+
+static int ath11k_mhi_op_bw_scale(struct mhi_controller *mhi_cntrl,
+				  struct mhi_link_info *link_info)
+{
+	struct ath11k_base *ab = dev_get_drvdata(mhi_cntrl->cntrl_dev);
+	struct pci_dev *pci_dev = to_pci_dev(ab->dev);
+	struct pci_dev *pdev;
+	u8 speed = pcie_link_speed[link_info->target_link_speed];
+
+	if (!pci_dev)
+		return -EINVAL;
+
+	pdev = pci_upstream_bridge(pci_dev);
+	if (!pdev)
+		return -ENODEV;
+
+	return pcie_set_target_speed(pdev, speed, true);
+}
+
 static int ath11k_mhi_read_addr_from_dt(struct mhi_controller *mhi_ctrl)
 {
 	struct device_node *np;
@@ -389,6 +428,8 @@ int ath11k_mhi_register(struct ath11k_pci *ab_pci)
 	mhi_ctrl->status_cb = ath11k_mhi_op_status_cb;
 	mhi_ctrl->read_reg = ath11k_mhi_op_read_reg;
 	mhi_ctrl->write_reg = ath11k_mhi_op_write_reg;
+	mhi_ctrl->bw_scale = ath11k_mhi_op_bw_scale;
+	mhi_ctrl->get_misc_doorbell = ath11k_mhi_op_get_misc_doorbell;
 
 	switch (ab->hw_rev) {
 	case ATH11K_HW_QCN9074_HW10:

-- 
2.34.1