[PATCH 5.15 537/917] wcn36xx: Channel list update before hardware scan

Greg Kroah-Hartman
2021-11-15T23:45:02Z

From: Loic Poulain <loic.poulain@linaro.org>

[ Upstream commit d707f812bb0513ea0030d0c9fe2a456bae5a4583 ]

The channel scan list must be updated before triggering a hardware scan
so that firmware takes into account the regulatory info for each single
channel such as active/passive config, power, DFS, etc... Without this
the firmware uses its own internal default channel configuration, which
is not aligned with mac80211 regulatory rules, and misses several
channels (e.g. 144).

Fixes: 2f3bef4b247e ("wcn36xx: Add hardware scan offload support")
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1635175328-25642-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/wcn36xx/hal.h | 32 ++++++++++
drivers/net/wireless/ath/wcn36xx/main.c | 1 +
drivers/net/wireless/ath/wcn36xx/smd.c | 82 +++++++++++++++++++++++++
drivers/net/wireless/ath/wcn36xx/smd.h | 1 +
4 files changed, 116 insertions(+)

diff --git a/drivers/net/wireless/ath/wcn36xx/hal.h b/drivers/net/wireless/ath/wcn36xx/hal.h
index 455143c4164ee..de3bca043c2b3 100644
--- a/drivers/net/wireless/ath/wcn36xx/hal.h
+++ b/drivers/net/wireless/ath/wcn36xx/hal.h
@@ -359,6 +359,8 @@ enum wcn36xx_hal_host_msg_type {
WCN36XX_HAL_START_SCAN_OFFLOAD_RSP = 205,
WCN36XX_HAL_STOP_SCAN_OFFLOAD_REQ = 206,
WCN36XX_HAL_STOP_SCAN_OFFLOAD_RSP = 207,
+ WCN36XX_HAL_UPDATE_CHANNEL_LIST_REQ = 208,
+ WCN36XX_HAL_UPDATE_CHANNEL_LIST_RSP = 209,
WCN36XX_HAL_SCAN_OFFLOAD_IND = 210,

WCN36XX_HAL_AVOID_FREQ_RANGE_IND = 233,
@@ -1353,6 +1355,36 @@ struct wcn36xx_hal_stop_scan_offload_rsp_msg {
u32 status;
} __packed;

+#define WCN36XX_HAL_CHAN_REG1_MIN_PWR_MASK 0x000000ff
+#define WCN36XX_HAL_CHAN_REG1_MAX_PWR_MASK 0x0000ff00
+#define WCN36XX_HAL_CHAN_REG1_REG_PWR_MASK 0x00ff0000
+#define WCN36XX_HAL_CHAN_REG1_CLASS_ID_MASK 0xff000000
+#define WCN36XX_HAL_CHAN_REG2_ANT_GAIN_MASK 0x000000ff
+#define WCN36XX_HAL_CHAN_INFO_FLAG_PASSIVE BIT(7)
+#define WCN36XX_HAL_CHAN_INFO_FLAG_DFS BIT(10)
+#define WCN36XX_HAL_CHAN_INFO_FLAG_HT BIT(11)
+#define WCN36XX_HAL_CHAN_INFO_FLAG_VHT BIT(12)
+#define WCN36XX_HAL_CHAN_INFO_PHY_11A 0
+#define WCN36XX_HAL_CHAN_INFO_PHY_11BG 1
+#define WCN36XX_HAL_DEFAULT_ANT_GAIN 6
+#define WCN36XX_HAL_DEFAULT_MIN_POWER 6
+
+struct wcn36xx_hal_channel_param {
+ u32 mhz;
+ u32 band_center_freq1;
+ u32 band_center_freq2;
+ u32 channel_info;
+ u32 reg_info_1;
+ u32 reg_info_2;
+} __packed;
+
+struct wcn36xx_hal_update_channel_list_req_msg {
+ struct wcn36xx_hal_msg_header header;
+
+ u8 num_channel;
+ struct wcn36xx_hal_channel_param channels[80];
+} __packed;
+
enum wcn36xx_hal_rate_index {
HW_RATE_INDEX_1MBPS = 0x82,
HW_RATE_INDEX_2MBPS = 0x84,
diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index 5974b01f2fd92..5d82aca370a72 100644
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -671,6 +671,7 @@ static int wcn36xx_hw_scan(struct ieee80211_hw *hw,

mutex_unlock(&wcn->scan_lock);

+ wcn36xx_smd_update_channel_list(wcn, &hw_req->req);
return wcn36xx_smd_start_hw_scan(wcn, vif, &hw_req->req);
}

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
index f6bea896abe85..70bffe3d87a12 100644
--- a/drivers/net/wireless/ath/wcn36xx/smd.c
+++ b/drivers/net/wireless/ath/wcn36xx/smd.c
@@ -16,6 +16,7 @@

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

+#include <linux/bitfield.h>
#include <linux/etherdevice.h>
#include <linux/firmware.h>
#include <linux/bitops.h>
@@ -927,6 +928,86 @@ out:
return ret;
}

+int wcn36xx_smd_update_channel_list(struct wcn36xx *wcn, struct cfg80211_scan_request *req)
+{
+ struct wcn36xx_hal_update_channel_list_req_msg *msg_body;
+ int ret, i;
+
+ msg_body = kzalloc(sizeof(*msg_body), GFP_KERNEL);
+ if (!msg_body)
+ return -ENOMEM;
+
+ INIT_HAL_MSG((*msg_body), WCN36XX_HAL_UPDATE_CHANNEL_LIST_REQ);
+
+ msg_body->num_channel = min_t(u8, req->n_channels, sizeof(msg_body->channels));
+ for (i = 0; i < msg_body->num_channel; i++) {
+ struct wcn36xx_hal_channel_param *param = &msg_body->channels[i];
+ u32 min_power = WCN36XX_HAL_DEFAULT_MIN_POWER;
+ u32 ant_gain = WCN36XX_HAL_DEFAULT_ANT_GAIN;
+
+ param->mhz = req->channels[i]->center_freq;
+ param->band_center_freq1 = req->channels[i]->center_freq;
+ param->band_center_freq2 = 0;
+
+ if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
+ param->channel_info |= WCN36XX_HAL_CHAN_INFO_FLAG_PASSIVE;
+
+ if (req->channels[i]->flags & IEEE80211_CHAN_RADAR)
+ param->channel_info |= WCN36XX_HAL_CHAN_INFO_FLAG_DFS;
+
+ if (req->channels[i]->band == NL80211_BAND_5GHZ) {
+ param->channel_info |= WCN36XX_HAL_CHAN_INFO_FLAG_HT;
+ param->channel_info |= WCN36XX_HAL_CHAN_INFO_FLAG_VHT;
+ param->channel_info |= WCN36XX_HAL_CHAN_INFO_PHY_11A;
+ } else {
+ param->channel_info |= WCN36XX_HAL_CHAN_INFO_PHY_11BG;
+ }
+
+ if (min_power > req->channels[i]->max_power)
+ min_power = req->channels[i]->max_power;
+
+ if (req->channels[i]->max_antenna_gain)
+ ant_gain = req->channels[i]->max_antenna_gain;
+
+ u32p_replace_bits(&param->reg_info_1, min_power,
+ WCN36XX_HAL_CHAN_REG1_MIN_PWR_MASK);
+ u32p_replace_bits(&param->reg_info_1, req->channels[i]->max_power,
+ WCN36XX_HAL_CHAN_REG1_MAX_PWR_MASK);
+ u32p_replace_bits(&param->reg_info_1, req->channels[i]->max_reg_power,
+ WCN36XX_HAL_CHAN_REG1_REG_PWR_MASK);
+ u32p_replace_bits(&param->reg_info_1, 0,
+ WCN36XX_HAL_CHAN_REG1_CLASS_ID_MASK);
+ u32p_replace_bits(&param->reg_info_2, ant_gain,
+ WCN36XX_HAL_CHAN_REG2_ANT_GAIN_MASK);
+
+ wcn36xx_dbg(WCN36XX_DBG_HAL,
+ "%s: freq=%u, channel_info=%08x, reg_info1=%08x, reg_info2=%08x\n",
+ __func__, param->mhz, param->channel_info, param->reg_info_1,
+ param->reg_info_2);
+ }
+
+ mutex_lock(&wcn->hal_mutex);
+
+ PREPARE_HAL_BUF(wcn->hal_buf, (*msg_body));
+
+ ret = wcn36xx_smd_send_and_wait(wcn, msg_body->header.len);
+ if (ret) {
+ wcn36xx_err("Sending hal_update_channel_list failed\n");
+ goto out;
+ }
+
+ ret = wcn36xx_smd_rsp_status_check(wcn->hal_buf, wcn->hal_rsp_len);
+ if (ret) {
+ wcn36xx_err("hal_update_channel_list response failed err=%d\n", ret);
+ goto out;
+ }
+
+out:
+ kfree(msg_body);
+ mutex_unlock(&wcn->hal_mutex);
+ return ret;
+}
+
static int wcn36xx_smd_switch_channel_rsp(void *buf, size_t len)
{
struct wcn36xx_hal_switch_channel_rsp_msg *rsp;
@@ -3082,6 +3163,7 @@ int wcn36xx_smd_rsp_process(struct rpmsg_device *rpdev,
case WCN36XX_HAL_GTK_OFFLOAD_RSP:
case WCN36XX_HAL_GTK_OFFLOAD_GETINFO_RSP:
case WCN36XX_HAL_HOST_RESUME_RSP:
+ case WCN36XX_HAL_UPDATE_CHANNEL_LIST_RSP:
memcpy(wcn->hal_buf, buf, len);
wcn->hal_rsp_len = len;
complete(&wcn->hal_rsp_compl);
diff --git a/drivers/net/wireless/ath/wcn36xx/smd.h b/drivers/net/wireless/ath/wcn36xx/smd.h
index d8bded03945d4..d3774568d885e 100644
--- a/drivers/net/wireless/ath/wcn36xx/smd.h
+++ b/drivers/net/wireless/ath/wcn36xx/smd.h
@@ -70,6 +70,7 @@ int wcn36xx_smd_update_scan_params(struct wcn36xx *wcn, u8 *channels, size_t cha
int wcn36xx_smd_start_hw_scan(struct wcn36xx *wcn, struct ieee80211_vif *vif,
struct cfg80211_scan_request *req);
int wcn36xx_smd_stop_hw_scan(struct wcn36xx *wcn);
+int wcn36xx_smd_update_channel_list(struct wcn36xx *wcn, struct cfg80211_scan_request *req);
int wcn36xx_smd_add_sta_self(struct wcn36xx *wcn, struct ieee80211_vif *vif);
int wcn36xx_smd_delete_sta_self(struct wcn36xx *wcn, u8 *addr);
int wcn36xx_smd_delete_sta(struct wcn36xx *wcn, u8 sta_index);
--
2.33.0