From 804e9b7fb356ead474a64f036ac227fef6ad8bbc Mon Sep 17 00:00:00 2001
From: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
Date: Thu, 21 Jan 2021 11:53:43 -0800
Subject: [PATCH] ath11k: add debugfs to disable dynamic bandwidth operation

Bydefault dynamic bandwidth operation is enabled. Setting this debugfs
to 1 disables it.

Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
---
 drivers/net/wireless/ath/ath11k/core.h  |  1 +
 drivers/net/wireless/ath/ath11k/debugfs.c | 65 +++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -524,6 +524,7 @@ struct ath11k_debug {
 	struct completion wmi_ctrl_path_stats_rcvd;
 	u32 wmi_ctrl_path_stats_tagid;
 	struct ath11k_db_module_debug *module_debug[WMI_DIRECT_BUF_MAX];
+	bool disable_dynamic_bw;
 };
 
 struct ath11k_per_peer_tx_stats {
--- a/drivers/net/wireless/ath/ath11k/debugfs.c
+++ b/drivers/net/wireless/ath/ath11k/debugfs.c
@@ -3478,6 +3478,68 @@ static const struct file_operations fops
 	.llseek = default_llseek,
 };
 
+static ssize_t ath11k_write_disable_dynamic_bw(struct file *file,
+					       const char __user *ubuf,
+					       size_t count, loff_t *ppos)
+{
+	struct ath11k *ar = file->private_data;
+	u32 filter;
+	int ret;
+
+	if (kstrtouint_from_user(ubuf, count, 0, &filter))
+		return -EINVAL;
+
+	mutex_lock(&ar->conf_mutex);
+
+	if (ar->state != ATH11K_STATE_ON) {
+		ret = -ENETDOWN;
+		goto out;
+	}
+
+	if (filter == ar->debug.disable_dynamic_bw) {
+		ret = count;
+		goto out;
+	}
+
+	ret = ath11k_wmi_pdev_set_param(ar, WMI_PDEV_PARAM_DYNAMIC_BW, !filter,
+					ar->pdev->pdev_id);
+	if (ret) {
+		ath11k_err(ar->ab, "failed to %s dynamic bw: %d\n",
+			   filter ? "disable" : "enable", ret);
+		goto out;
+	}
+
+	ar->debug.disable_dynamic_bw = filter;
+	ret = count;
+
+out:
+	mutex_unlock(&ar->conf_mutex);
+	return ret;
+}
+
+static ssize_t ath11k_read_disable_dynamic_bw(struct file *file,
+					      char __user *ubuf,
+					      size_t count, loff_t *ppos)
+
+{
+	char buf[32] = {0};
+	struct ath11k *ar = file->private_data;
+	int len = 0;
+
+	mutex_lock(&ar->conf_mutex);
+	len = scnprintf(buf, sizeof(buf) - len, "%08x\n",
+			ar->debug.disable_dynamic_bw);
+	mutex_unlock(&ar->conf_mutex);
+
+	return simple_read_from_buffer(ubuf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_disable_dyn_bw = {
+	.read = ath11k_read_disable_dynamic_bw,
+	.write = ath11k_write_disable_dynamic_bw,
+	.open = simple_open
+};
+
 int ath11k_debugfs_register(struct ath11k *ar)
 {
 	struct ath11k_base *ab = ar->ab;
@@ -3527,6 +3589,9 @@ int ath11k_debugfs_register(struct ath11
 	debugfs_create_file("dump_mgmt_stats", 0644,
 			    ar->debug.debugfs_pdev, ar,
 			    &fops_dump_mgmt_stats);
+	debugfs_create_file("disable_dynamic_bw", 0644,
+			    ar->debug.debugfs_pdev, ar,
+			    &fops_disable_dyn_bw);
 
 	debugfs_create_file("ps_state_enable", 0600, ar->debug.debugfs_pdev, ar,
 			    &fops_ps_state_enable);