According to Realtek programmers, "to adjust oscillator to align
central frequency of connected AP. Then, it can yield better
performance." From commit fb8517f4fade ("rtw88: 8822c: add CFO
tracking").
The RTL8192CU and a version of RTL8723AU apparently don't have the
ability to adjust the oscillator, so this doesn't apply to them.
This also doesn't apply to the wifi + bluetooth combo chips (RTL8723AU
and RTL8723BU) because the CFO tracking should only be done when
bluetooth is disabled, and determining that looked complicated.
That leaves only the RTL8192EU and RTL8188FU chips. I tested this with
the latter.
Signed-off-by: Bitterblue Smith <[email protected]>
---
v4:
- Rebased on top of wireless-next.
v3:
- No change.
v2:
- Suggestions from Ping-Ke Shih:
- Use FIELD_PREP().
- Let packet_count wrap around.
- Use clamp().
---
.../net/wireless/realtek/rtl8xxxu/rtl8xxxu.h | 21 ++-
.../realtek/rtl8xxxu/rtl8xxxu_8188f.c | 39 ++++-
.../realtek/rtl8xxxu/rtl8xxxu_8192e.c | 4 +-
.../realtek/rtl8xxxu/rtl8xxxu_8723a.c | 38 ++++-
.../realtek/rtl8xxxu/rtl8xxxu_8723b.c | 4 +-
.../wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 137 ++++++++++++++++--
.../wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h | 1 +
7 files changed, 212 insertions(+), 32 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
index ad3f32f4c6e7..eee48817d4d7 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
@@ -570,7 +570,7 @@ struct rtl8723au_phy_stats {
u8 cck_rpt_b_ofdm_cfosho_b;
u8 reserved_1;
u8 noise_power_db_msb;
- u8 path_cfotail[RTL8723A_MAX_RF_PATHS];
+ s8 path_cfotail[RTL8723A_MAX_RF_PATHS];
u8 pcts_mask[RTL8723A_MAX_RF_PATHS];
s8 stream_rxevm[RTL8723A_MAX_RF_PATHS];
u8 path_rxsnr[RTL8723A_MAX_RF_PATHS];
@@ -1323,6 +1323,19 @@ struct rtl8xxxu_ra_report {
u8 desc_rate;
};
+#define CFO_TH_XTAL_HIGH 20 /* kHz */
+#define CFO_TH_XTAL_LOW 10 /* kHz */
+#define CFO_TH_ATC 80 /* kHz */
+
+struct rtl8xxxu_cfo_tracking {
+ bool adjust;
+ bool atc_status;
+ int cfo_tail[2];
+ u8 crystal_cap;
+ u32 packet_count;
+ u32 packet_count_pre;
+};
+
struct rtl8xxxu_priv {
struct ieee80211_hw *hw;
struct usb_device *udev;
@@ -1381,9 +1394,8 @@ struct rtl8xxxu_priv {
u32 ep_tx_high_queue:1;
u32 ep_tx_normal_queue:1;
u32 ep_tx_low_queue:1;
- u32 has_xtalk:1;
u32 rx_buf_aggregation:1;
- u8 xtalk;
+ u8 default_crystal_cap;
unsigned int pipe_interrupt;
unsigned int pipe_in;
unsigned int pipe_out[TXDESC_QUEUE_MAX];
@@ -1441,6 +1453,7 @@ struct rtl8xxxu_priv {
struct sk_buff_head c2hcmd_queue;
struct rtl8xxxu_btcoex bt_coex;
struct rtl8xxxu_ra_report ra_report;
+ struct rtl8xxxu_cfo_tracking cfo_tracking;
};
struct rtl8xxxu_rx_urb {
@@ -1485,6 +1498,7 @@ struct rtl8xxxu_fileops {
struct rtl8xxxu_txdesc32 *tx_desc, bool sgi,
bool short_preamble, bool ampdu_enable,
u32 rts_rate);
+ void (*set_crystal_cap) (struct rtl8xxxu_priv *priv, u8 crystal_cap);
int writeN_block_size;
int rx_agg_buf_size;
char tx_desc_size;
@@ -1594,6 +1608,7 @@ void rtl8xxxu_fill_txdesc_v2(struct ieee80211_hw *hw, struct ieee80211_hdr *hdr,
void rtl8723bu_set_ps_tdma(struct rtl8xxxu_priv *priv,
u8 arg1, u8 arg2, u8 arg3, u8 arg4, u8 arg5);
void rtl8723bu_phy_init_antenna_selection(struct rtl8xxxu_priv *priv);
+void rtl8723a_set_crystal_cap(struct rtl8xxxu_priv *priv, u8 crystal_cap);
extern struct rtl8xxxu_fileops rtl8188fu_fops;
extern struct rtl8xxxu_fileops rtl8192cu_fops;
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
index 0025bb32538d..9f40d261ac71 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
@@ -703,7 +703,7 @@ static int rtl8188fu_parse_efuse(struct rtl8xxxu_priv *priv)
priv->ofdm_tx_power_diff[0].a = efuse->tx_power_index_A.ht20_ofdm_1s_diff.a;
priv->ht20_tx_power_diff[0].a = efuse->tx_power_index_A.ht20_ofdm_1s_diff.b;
- priv->xtalk = efuse->xtal_k & 0x3f;
+ priv->default_crystal_cap = efuse->xtal_k & 0x3f;
dev_info(&priv->udev->dev, "Vendor: %.7s\n", efuse->vendor_name);
dev_info(&priv->udev->dev, "Product: %.7s\n", efuse->device_name);
@@ -737,7 +737,6 @@ static void rtl8188fu_init_phy_bb(struct rtl8xxxu_priv *priv)
{
u8 val8;
u16 val16;
- u32 val32;
/* Enable BB and RF */
val16 = rtl8xxxu_read16(priv, REG_SYS_FUNC);
@@ -759,12 +758,6 @@ static void rtl8188fu_init_phy_bb(struct rtl8xxxu_priv *priv)
rtl8xxxu_init_phy_regs(priv, rtl8188fu_phy_init_table);
rtl8xxxu_init_phy_regs(priv, rtl8188f_agc_table);
-
- val32 = rtl8xxxu_read32(priv, REG_AFE_XTAL_CTRL);
- val8 = priv->xtalk;
- val32 &= ~0x007FF800;
- val32 |= ((val8 | (val8 << 6)) << 11);
- rtl8xxxu_write32(priv, REG_AFE_XTAL_CTRL, val32);
}
static int rtl8188fu_init_phy_rf(struct rtl8xxxu_priv *priv)
@@ -1636,6 +1629,35 @@ static void rtl8188f_usb_quirks(struct rtl8xxxu_priv *priv)
rtl8xxxu_write32(priv, REG_TXDMA_OFFSET_CHK, val32);
}
+#define XTAL1 GENMASK(22, 17)
+#define XTAL0 GENMASK(16, 11)
+
+static void rtl8188f_set_crystal_cap(struct rtl8xxxu_priv *priv, u8 crystal_cap)
+{
+ struct rtl8xxxu_cfo_tracking *cfo = &priv->cfo_tracking;
+ u32 val32;
+
+ if (crystal_cap == cfo->crystal_cap)
+ return;
+
+ val32 = rtl8xxxu_read32(priv, REG_AFE_XTAL_CTRL);
+
+ dev_dbg(&priv->udev->dev,
+ "%s: Adjusting crystal cap from 0x%x (actually 0x%lx 0x%lx) to 0x%x\n",
+ __func__,
+ cfo->crystal_cap,
+ FIELD_GET(XTAL1, val32),
+ FIELD_GET(XTAL0, val32),
+ crystal_cap);
+
+ val32 &= ~(XTAL1 | XTAL0);
+ val32 |= FIELD_PREP(XTAL1, crystal_cap) |
+ FIELD_PREP(XTAL0, crystal_cap);
+ rtl8xxxu_write32(priv, REG_AFE_XTAL_CTRL, val32);
+
+ cfo->crystal_cap = crystal_cap;
+}
+
struct rtl8xxxu_fileops rtl8188fu_fops = {
.parse_efuse = rtl8188fu_parse_efuse,
.load_firmware = rtl8188fu_load_firmware,
@@ -1659,6 +1681,7 @@ struct rtl8xxxu_fileops rtl8188fu_fops = {
.update_rate_mask = rtl8xxxu_gen2_update_rate_mask,
.report_connect = rtl8xxxu_gen2_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
+ .set_crystal_cap = rtl8188f_set_crystal_cap,
.writeN_block_size = 128,
.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
index 550290ae9e17..bc0ec72d0126 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
@@ -635,8 +635,7 @@ static int rtl8192eu_parse_efuse(struct rtl8xxxu_priv *priv)
efuse->tx_power_index_B.pwr_diff[i - 1].ht40;
}
- priv->has_xtalk = 1;
- priv->xtalk = priv->efuse_wifi.efuse8192eu.xtal_k & 0x3f;
+ priv->default_crystal_cap = priv->efuse_wifi.efuse8192eu.xtal_k & 0x3f;
/*
* device_info section seems to be laid out as records
@@ -1691,6 +1690,7 @@ struct rtl8xxxu_fileops rtl8192eu_fops = {
.update_rate_mask = rtl8xxxu_gen2_update_rate_mask,
.report_connect = rtl8xxxu_gen2_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
+ .set_crystal_cap = rtl8723a_set_crystal_cap,
.writeN_block_size = 128,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
index 44565bf4c1c2..552763a2215c 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
@@ -166,10 +166,10 @@ static int rtl8723au_parse_efuse(struct rtl8xxxu_priv *priv)
efuse->ht20_max_power_offset,
sizeof(efuse->ht20_max_power_offset));
- if (priv->efuse_wifi.efuse8723.version >= 0x01) {
- priv->has_xtalk = 1;
- priv->xtalk = priv->efuse_wifi.efuse8723.xtal_k & 0x3f;
- }
+ if (priv->efuse_wifi.efuse8723.version >= 0x01)
+ priv->default_crystal_cap = priv->efuse_wifi.efuse8723.xtal_k & 0x3f;
+ else
+ priv->fops->set_crystal_cap = NULL;
priv->power_base = &rtl8723a_power_base;
@@ -357,6 +357,35 @@ static int rtl8723au_power_on(struct rtl8xxxu_priv *priv)
return ret;
}
+#define XTAL1 GENMASK(23, 18)
+#define XTAL0 GENMASK(17, 12)
+
+void rtl8723a_set_crystal_cap(struct rtl8xxxu_priv *priv, u8 crystal_cap)
+{
+ struct rtl8xxxu_cfo_tracking *cfo = &priv->cfo_tracking;
+ u32 val32;
+
+ if (crystal_cap == cfo->crystal_cap)
+ return;
+
+ val32 = rtl8xxxu_read32(priv, REG_MAC_PHY_CTRL);
+
+ dev_dbg(&priv->udev->dev,
+ "%s: Adjusting crystal cap from 0x%x (actually 0x%lx 0x%lx) to 0x%x\n",
+ __func__,
+ cfo->crystal_cap,
+ FIELD_GET(XTAL1, val32),
+ FIELD_GET(XTAL0, val32),
+ crystal_cap);
+
+ val32 &= ~(XTAL1 | XTAL0);
+ val32 |= FIELD_PREP(XTAL1, crystal_cap) |
+ FIELD_PREP(XTAL0, crystal_cap);
+ rtl8xxxu_write32(priv, REG_MAC_PHY_CTRL, val32);
+
+ cfo->crystal_cap = crystal_cap;
+}
+
struct rtl8xxxu_fileops rtl8723au_fops = {
.parse_efuse = rtl8723au_parse_efuse,
.load_firmware = rtl8723au_load_firmware,
@@ -378,6 +407,7 @@ struct rtl8xxxu_fileops rtl8723au_fops = {
.update_rate_mask = rtl8xxxu_update_rate_mask,
.report_connect = rtl8xxxu_gen1_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v1,
+ .set_crystal_cap = rtl8723a_set_crystal_cap,
.writeN_block_size = 1024,
.rx_agg_buf_size = 16000,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc32),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
index a27fe06d6f77..9bfcb1e12183 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
@@ -445,8 +445,7 @@ static int rtl8723bu_parse_efuse(struct rtl8xxxu_priv *priv)
efuse->tx_power_index_B.pwr_diff[i - 1].ht40;
}
- priv->has_xtalk = 1;
- priv->xtalk = priv->efuse_wifi.efuse8723bu.xtal_k & 0x3f;
+ priv->default_crystal_cap = priv->efuse_wifi.efuse8723bu.xtal_k & 0x3f;
dev_info(&priv->udev->dev, "Vendor: %.7s\n", efuse->vendor_name);
dev_info(&priv->udev->dev, "Product: %.41s\n", efuse->device_name);
@@ -1663,6 +1662,7 @@ struct rtl8xxxu_fileops rtl8723bu_fops = {
.update_rate_mask = rtl8xxxu_gen2_update_rate_mask,
.report_connect = rtl8xxxu_gen2_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
+ .set_crystal_cap = rtl8723a_set_crystal_cap,
.writeN_block_size = 1024,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 65bb4dc8f555..3bd9e5370b23 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -2286,7 +2286,6 @@ void rtl8xxxu_gen1_init_phy_bb(struct rtl8xxxu_priv *priv)
*/
static int rtl8xxxu_init_phy_bb(struct rtl8xxxu_priv *priv)
{
- u8 val8;
u32 val32;
priv->fops->init_phy_bb(priv);
@@ -2351,15 +2350,8 @@ static int rtl8xxxu_init_phy_bb(struct rtl8xxxu_priv *priv)
rtl8xxxu_write32(priv, REG_TX_TO_TX, val32);
}
- if (priv->has_xtalk) {
- val32 = rtl8xxxu_read32(priv, REG_MAC_PHY_CTRL);
-
- val8 = priv->xtalk;
- val32 &= 0xff000fff;
- val32 |= ((val8 | (val8 << 6)) << 12);
-
- rtl8xxxu_write32(priv, REG_MAC_PHY_CTRL, val32);
- }
+ if (priv->fops->set_crystal_cap)
+ priv->fops->set_crystal_cap(priv, priv->default_crystal_cap);
if (priv->rtl_chip == RTL8192E)
rtl8xxxu_write32(priv, REG_AFE_XTAL_CTRL, 0x000f81fb);
@@ -4327,6 +4319,15 @@ static int rtl8xxxu_init_device(struct ieee80211_hw *hw)
val32 |= 0x0007e000;
rtl8xxxu_write32(priv, REG_AFE_MISC, val32);
}
+
+ /* Initialise the center frequency offset tracking */
+ if (priv->fops->set_crystal_cap) {
+ val32 = rtl8xxxu_read32(priv, REG_OFDM1_CFO_TRACKING);
+ priv->cfo_tracking.atc_status = val32 & CFO_TRACKING_ATC_STATUS;
+ priv->cfo_tracking.adjust = true;
+ priv->cfo_tracking.crystal_cap = priv->default_crystal_cap;
+ }
+
exit:
return ret;
}
@@ -5294,7 +5295,8 @@ static void rtl8xxxu_tx(struct ieee80211_hw *hw,
static void rtl8xxxu_rx_parse_phystats(struct rtl8xxxu_priv *priv,
struct ieee80211_rx_status *rx_status,
struct rtl8723au_phy_stats *phy_stats,
- u32 rxmcs)
+ u32 rxmcs, struct ieee80211_hdr *hdr,
+ bool crc_icv_err)
{
if (phy_stats->sgi_en)
rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
@@ -5320,6 +5322,21 @@ static void rtl8xxxu_rx_parse_phystats(struct rtl8xxxu_priv *priv,
break;
}
} else {
+ bool parse_cfo = priv->fops->set_crystal_cap &&
+ priv->vif &&
+ priv->vif->type == NL80211_IFTYPE_STATION &&
+ priv->vif->cfg.assoc &&
+ !crc_icv_err &&
+ !ieee80211_is_ctl(hdr->frame_control) &&
+ ether_addr_equal(priv->vif->bss_conf.bssid, hdr->addr2);
+
+ if (parse_cfo) {
+ priv->cfo_tracking.cfo_tail[0] = phy_stats->path_cfotail[0];
+ priv->cfo_tracking.cfo_tail[1] = phy_stats->path_cfotail[1];
+
+ priv->cfo_tracking.packet_count++;
+ }
+
rx_status->signal =
(phy_stats->cck_sig_qual_ofdm_pwdb_all >> 1) - 110;
}
@@ -5802,7 +5819,8 @@ int rtl8xxxu_parse_rxdesc16(struct rtl8xxxu_priv *priv, struct sk_buff *skb)
if (rx_desc->phy_stats)
rtl8xxxu_rx_parse_phystats(priv, rx_status, phy_stats,
- rx_desc->rxmcs);
+ rx_desc->rxmcs, (struct ieee80211_hdr *)skb->data,
+ rx_desc->crc32 || rx_desc->icverr);
rx_status->mactime = rx_desc->tsfl;
rx_status->flag |= RX_FLAG_MACTIME_START;
@@ -5873,7 +5891,8 @@ int rtl8xxxu_parse_rxdesc24(struct rtl8xxxu_priv *priv, struct sk_buff *skb)
if (rx_desc->phy_stats)
rtl8xxxu_rx_parse_phystats(priv, rx_status, phy_stats,
- rx_desc->rxmcs);
+ rx_desc->rxmcs, (struct ieee80211_hdr *)skb->data,
+ rx_desc->crc32 || rx_desc->icverr);
rx_status->mactime = rx_desc->tsfl;
rx_status->flag |= RX_FLAG_MACTIME_START;
@@ -6488,6 +6507,94 @@ static void rtl8xxxu_refresh_rate_mask(struct rtl8xxxu_priv *priv,
}
}
+static void rtl8xxxu_set_atc_status(struct rtl8xxxu_priv *priv, bool atc_status)
+{
+ struct rtl8xxxu_cfo_tracking *cfo = &priv->cfo_tracking;
+ u32 val32;
+
+ if (atc_status == cfo->atc_status)
+ return;
+
+ cfo->atc_status = atc_status;
+
+ val32 = rtl8xxxu_read32(priv, REG_OFDM1_CFO_TRACKING);
+ if (atc_status)
+ val32 |= CFO_TRACKING_ATC_STATUS;
+ else
+ val32 &= ~CFO_TRACKING_ATC_STATUS;
+ rtl8xxxu_write32(priv, REG_OFDM1_CFO_TRACKING, val32);
+}
+
+/* Central frequency offset correction */
+static void rtl8xxxu_track_cfo(struct rtl8xxxu_priv *priv)
+{
+ struct rtl8xxxu_cfo_tracking *cfo = &priv->cfo_tracking;
+ int cfo_khz_a, cfo_khz_b, cfo_average;
+ int crystal_cap;
+
+ if (!priv->vif || !priv->vif->cfg.assoc) {
+ /* Reset */
+ cfo->adjust = true;
+
+ if (cfo->crystal_cap > priv->default_crystal_cap)
+ priv->fops->set_crystal_cap(priv, cfo->crystal_cap - 1);
+ else if (cfo->crystal_cap < priv->default_crystal_cap)
+ priv->fops->set_crystal_cap(priv, cfo->crystal_cap + 1);
+
+ rtl8xxxu_set_atc_status(priv, true);
+
+ return;
+ }
+
+ if (cfo->packet_count == cfo->packet_count_pre)
+ /* No new information. */
+ return;
+
+ cfo->packet_count_pre = cfo->packet_count;
+
+ /* CFO_tail[1:0] is S(8,7), (num_subcarrier>>7) x 312.5K = CFO value(K Hz) */
+ cfo_khz_a = (int)((cfo->cfo_tail[0] * 3125) / 10) >> 7;
+ cfo_khz_b = (int)((cfo->cfo_tail[1] * 3125) / 10) >> 7;
+
+ if (priv->tx_paths == 1)
+ cfo_average = cfo_khz_a;
+ else
+ cfo_average = (cfo_khz_a + cfo_khz_b) / 2;
+
+ dev_dbg(&priv->udev->dev, "cfo_average: %d\n", cfo_average);
+
+ if (cfo->adjust) {
+ if (abs(cfo_average) < CFO_TH_XTAL_LOW)
+ cfo->adjust = false;
+ } else {
+ if (abs(cfo_average) > CFO_TH_XTAL_HIGH)
+ cfo->adjust = true;
+ }
+
+ /*
+ * TODO: We should return here only if bluetooth is enabled.
+ * See the vendor drivers for how to determine that.
+ */
+ if (priv->has_bluetooth)
+ return;
+
+ if (!cfo->adjust)
+ return;
+
+ crystal_cap = cfo->crystal_cap;
+
+ if (cfo_average > CFO_TH_XTAL_LOW)
+ crystal_cap++;
+ else if (cfo_average < -CFO_TH_XTAL_LOW)
+ crystal_cap--;
+
+ crystal_cap = clamp(crystal_cap, 0, 0x3f);
+
+ priv->fops->set_crystal_cap(priv, crystal_cap);
+
+ rtl8xxxu_set_atc_status(priv, abs(cfo_average) >= CFO_TH_ATC);
+}
+
static void rtl8xxxu_watchdog_callback(struct work_struct *work)
{
struct ieee80211_vif *vif;
@@ -6512,6 +6619,10 @@ static void rtl8xxxu_watchdog_callback(struct work_struct *work)
rcu_read_unlock();
signal = ieee80211_ave_rssi(vif);
+
+ if (priv->fops->set_crystal_cap)
+ rtl8xxxu_track_cfo(priv);
+
rtl8xxxu_refresh_rate_mask(priv, signal, sta);
}
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
index 35bde1404793..190bc0e8dc33 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
@@ -1027,6 +1027,7 @@
#define REG_OFDM1_TRX_PATH_ENABLE 0x0d04
#define REG_OFDM1_CFO_TRACKING 0x0d2c
+#define CFO_TRACKING_ATC_STATUS BIT(11)
#define REG_OFDM1_CSI_FIX_MASK1 0x0d40
#define REG_OFDM1_CSI_FIX_MASK2 0x0d44
--
2.38.0
The CCK RSSI calculation is incorrect for the RTL8723BU, RTL8192EU,
and RTL8188FU. Add new functions for these chips with code copied from
their vendor drivers. Use the old code only for the RTL8723AU and
RTL8192CU.
I didn't notice any difference in the reported signal strength with my
RTL8188FU, but I didn't look very hard either.
Signed-off-by: Bitterblue Smith <[email protected]>
---
v4:
- Rebased on top of wireless-next.
v3:
- Feedback from Ping-Ke Shih:
- Use the name REG_AGC_RPT for register 0xa80.
- Use the name AGC_RPT_CCK for bit 7 of REG_AGC_RPT.
v2:
- No change.
---
.../net/wireless/realtek/rtl8xxxu/rtl8xxxu.h | 3 ++
.../realtek/rtl8xxxu/rtl8xxxu_8188f.c | 32 ++++++++++++++++
.../realtek/rtl8xxxu/rtl8xxxu_8192c.c | 1 +
.../realtek/rtl8xxxu/rtl8xxxu_8192e.c | 23 +++++++++++
.../realtek/rtl8xxxu/rtl8xxxu_8723a.c | 23 +++++++++++
.../realtek/rtl8xxxu/rtl8xxxu_8723b.c | 29 ++++++++++++++
.../wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 38 ++++++++++++-------
.../wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h | 3 ++
8 files changed, 138 insertions(+), 14 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
index eee48817d4d7..6ff554ba0250 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
@@ -1395,6 +1395,7 @@ struct rtl8xxxu_priv {
u32 ep_tx_normal_queue:1;
u32 ep_tx_low_queue:1;
u32 rx_buf_aggregation:1;
+ u32 cck_agc_report_type:1;
u8 default_crystal_cap;
unsigned int pipe_interrupt;
unsigned int pipe_in;
@@ -1499,6 +1500,7 @@ struct rtl8xxxu_fileops {
bool short_preamble, bool ampdu_enable,
u32 rts_rate);
void (*set_crystal_cap) (struct rtl8xxxu_priv *priv, u8 crystal_cap);
+ s8 (*cck_rssi) (struct rtl8xxxu_priv *priv, u8 cck_agc_rpt);
int writeN_block_size;
int rx_agg_buf_size;
char tx_desc_size;
@@ -1609,6 +1611,7 @@ void rtl8723bu_set_ps_tdma(struct rtl8xxxu_priv *priv,
u8 arg1, u8 arg2, u8 arg3, u8 arg4, u8 arg5);
void rtl8723bu_phy_init_antenna_selection(struct rtl8xxxu_priv *priv);
void rtl8723a_set_crystal_cap(struct rtl8xxxu_priv *priv, u8 crystal_cap);
+s8 rtl8723a_cck_rssi(struct rtl8xxxu_priv *priv, u8 cck_agc_rpt);
extern struct rtl8xxxu_fileops rtl8188fu_fops;
extern struct rtl8xxxu_fileops rtl8192cu_fops;
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
index 9f40d261ac71..5a5b7fa4283c 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
@@ -1658,6 +1658,37 @@ static void rtl8188f_set_crystal_cap(struct rtl8xxxu_priv *priv, u8 crystal_cap)
cfo->crystal_cap = crystal_cap;
}
+static s8 rtl8188f_cck_rssi(struct rtl8xxxu_priv *priv, u8 cck_agc_rpt)
+{
+ s8 rx_pwr_all = 0x00;
+ u8 vga_idx, lna_idx;
+
+ lna_idx = (cck_agc_rpt & 0xE0) >> 5;
+ vga_idx = cck_agc_rpt & 0x1F;
+
+ switch (lna_idx) {
+ case 7:
+ if (vga_idx <= 27)
+ rx_pwr_all = -100 + 2 * (27 - vga_idx);
+ else
+ rx_pwr_all = -100;
+ break;
+ case 5:
+ rx_pwr_all = -74 + 2 * (21 - vga_idx);
+ break;
+ case 3:
+ rx_pwr_all = -60 + 2 * (20 - vga_idx);
+ break;
+ case 1:
+ rx_pwr_all = -44 + 2 * (19 - vga_idx);
+ break;
+ default:
+ break;
+ }
+
+ return rx_pwr_all;
+}
+
struct rtl8xxxu_fileops rtl8188fu_fops = {
.parse_efuse = rtl8188fu_parse_efuse,
.load_firmware = rtl8188fu_load_firmware,
@@ -1682,6 +1713,7 @@ struct rtl8xxxu_fileops rtl8188fu_fops = {
.report_connect = rtl8xxxu_gen2_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
.set_crystal_cap = rtl8188f_set_crystal_cap,
+ .cck_rssi = rtl8188f_cck_rssi,
.writeN_block_size = 128,
.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c
index e9bc94edfa79..9dfeeaa74927 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c
@@ -561,6 +561,7 @@ struct rtl8xxxu_fileops rtl8192cu_fops = {
.update_rate_mask = rtl8xxxu_update_rate_mask,
.report_connect = rtl8xxxu_gen1_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v1,
+ .cck_rssi = rtl8723a_cck_rssi,
.writeN_block_size = 128,
.rx_agg_buf_size = 16000,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc32),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
index bc0ec72d0126..973a02afc82b 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
@@ -1670,6 +1670,28 @@ static void rtl8192e_enable_rf(struct rtl8xxxu_priv *priv)
rtl8xxxu_write8(priv, REG_PAD_CTRL1, val8);
}
+static s8 rtl8192e_cck_rssi(struct rtl8xxxu_priv *priv, u8 cck_agc_rpt)
+{
+ static const s8 lna_gain_table_0[8] = {15, 9, -10, -21, -23, -27, -43, -44};
+ static const s8 lna_gain_table_1[8] = {24, 18, 13, -4, -11, -18, -31, -36};
+
+ s8 rx_pwr_all = 0x00;
+ u8 vga_idx, lna_idx;
+ s8 lna_gain = 0;
+
+ lna_idx = (cck_agc_rpt & 0xE0) >> 5;
+ vga_idx = cck_agc_rpt & 0x1F;
+
+ if (priv->cck_agc_report_type == 0)
+ lna_gain = lna_gain_table_0[lna_idx];
+ else
+ lna_gain = lna_gain_table_1[lna_idx];
+
+ rx_pwr_all = lna_gain - (2 * vga_idx);
+
+ return rx_pwr_all;
+}
+
struct rtl8xxxu_fileops rtl8192eu_fops = {
.parse_efuse = rtl8192eu_parse_efuse,
.load_firmware = rtl8192eu_load_firmware,
@@ -1691,6 +1713,7 @@ struct rtl8xxxu_fileops rtl8192eu_fops = {
.report_connect = rtl8xxxu_gen2_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
.set_crystal_cap = rtl8723a_set_crystal_cap,
+ .cck_rssi = rtl8192e_cck_rssi,
.writeN_block_size = 128,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
index 552763a2215c..8d8eb16a0970 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
@@ -386,6 +386,28 @@ void rtl8723a_set_crystal_cap(struct rtl8xxxu_priv *priv, u8 crystal_cap)
cfo->crystal_cap = crystal_cap;
}
+s8 rtl8723a_cck_rssi(struct rtl8xxxu_priv *priv, u8 cck_agc_rpt)
+{
+ s8 rx_pwr_all = 0x00;
+
+ switch (cck_agc_rpt & 0xc0) {
+ case 0xc0:
+ rx_pwr_all = -46 - (cck_agc_rpt & 0x3e);
+ break;
+ case 0x80:
+ rx_pwr_all = -26 - (cck_agc_rpt & 0x3e);
+ break;
+ case 0x40:
+ rx_pwr_all = -12 - (cck_agc_rpt & 0x3e);
+ break;
+ case 0x00:
+ rx_pwr_all = 16 - (cck_agc_rpt & 0x3e);
+ break;
+ }
+
+ return rx_pwr_all;
+}
+
struct rtl8xxxu_fileops rtl8723au_fops = {
.parse_efuse = rtl8723au_parse_efuse,
.load_firmware = rtl8723au_load_firmware,
@@ -408,6 +430,7 @@ struct rtl8xxxu_fileops rtl8723au_fops = {
.report_connect = rtl8xxxu_gen1_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v1,
.set_crystal_cap = rtl8723a_set_crystal_cap,
+ .cck_rssi = rtl8723a_cck_rssi,
.writeN_block_size = 1024,
.rx_agg_buf_size = 16000,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc32),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
index 9bfcb1e12183..9214c1d3b644 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
@@ -1639,6 +1639,34 @@ static void rtl8723bu_init_statistics(struct rtl8xxxu_priv *priv)
rtl8xxxu_write32(priv, REG_OFDM0_FA_RSTC, val32);
}
+static s8 rtl8723b_cck_rssi(struct rtl8xxxu_priv *priv, u8 cck_agc_rpt)
+{
+ s8 rx_pwr_all = 0x00;
+ u8 vga_idx, lna_idx;
+
+ lna_idx = (cck_agc_rpt & 0xE0) >> 5;
+ vga_idx = cck_agc_rpt & 0x1F;
+
+ switch (lna_idx) {
+ case 6:
+ rx_pwr_all = -34 - (2 * vga_idx);
+ break;
+ case 4:
+ rx_pwr_all = -14 - (2 * vga_idx);
+ break;
+ case 1:
+ rx_pwr_all = 6 - (2 * vga_idx);
+ break;
+ case 0:
+ rx_pwr_all = 16 - (2 * vga_idx);
+ break;
+ default:
+ break;
+ }
+
+ return rx_pwr_all;
+}
+
struct rtl8xxxu_fileops rtl8723bu_fops = {
.parse_efuse = rtl8723bu_parse_efuse,
.load_firmware = rtl8723bu_load_firmware,
@@ -1663,6 +1691,7 @@ struct rtl8xxxu_fileops rtl8723bu_fops = {
.report_connect = rtl8xxxu_gen2_report_connect,
.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
.set_crystal_cap = rtl8723a_set_crystal_cap,
+ .cck_rssi = rtl8723b_cck_rssi,
.writeN_block_size = 1024,
.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 3bd9e5370b23..51cb22ee55cd 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -4318,6 +4318,29 @@ static int rtl8xxxu_init_device(struct ieee80211_hw *hw)
val32 &= 0xfff00fff;
val32 |= 0x0007e000;
rtl8xxxu_write32(priv, REG_AFE_MISC, val32);
+
+ /*
+ * 0x824[9] = 0x82C[9] = 0xA80[7] those registers setting
+ * should be equal or CCK RSSI report may be incorrect
+ */
+ val32 = rtl8xxxu_read32(priv, REG_FPGA0_XA_HSSI_PARM2);
+ priv->cck_agc_report_type = val32 & FPGA0_HSSI_PARM2_CCK_HIGH_PWR;
+
+ val32 = rtl8xxxu_read32(priv, REG_FPGA0_XB_HSSI_PARM2);
+ if (priv->cck_agc_report_type != (bool)(val32 & FPGA0_HSSI_PARM2_CCK_HIGH_PWR)) {
+ if (priv->cck_agc_report_type)
+ val32 |= FPGA0_HSSI_PARM2_CCK_HIGH_PWR;
+ else
+ val32 &= ~FPGA0_HSSI_PARM2_CCK_HIGH_PWR;
+ rtl8xxxu_write32(priv, REG_FPGA0_XB_HSSI_PARM2, val32);
+ }
+
+ val32 = rtl8xxxu_read32(priv, REG_AGC_RPT);
+ if (priv->cck_agc_report_type)
+ val32 |= AGC_RPT_CCK;
+ else
+ val32 &= ~AGC_RPT_CCK;
+ rtl8xxxu_write32(priv, REG_AGC_RPT, val32);
}
/* Initialise the center frequency offset tracking */
@@ -5307,20 +5330,7 @@ static void rtl8xxxu_rx_parse_phystats(struct rtl8xxxu_priv *priv,
*/
u8 cck_agc_rpt = phy_stats->cck_agc_rpt_ofdm_cfosho_a;
- switch (cck_agc_rpt & 0xc0) {
- case 0xc0:
- rx_status->signal = -46 - (cck_agc_rpt & 0x3e);
- break;
- case 0x80:
- rx_status->signal = -26 - (cck_agc_rpt & 0x3e);
- break;
- case 0x40:
- rx_status->signal = -12 - (cck_agc_rpt & 0x3e);
- break;
- case 0x00:
- rx_status->signal = 16 - (cck_agc_rpt & 0x3e);
- break;
- }
+ rx_status->signal = priv->fops->cck_rssi(priv, cck_agc_rpt);
} else {
bool parse_cfo = priv->fops->set_crystal_cap &&
priv->vif &&
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
index 190bc0e8dc33..04bf77959fba 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
@@ -960,6 +960,9 @@
#define CCK_PD_TYPE1_LV3_TH 0xdd
#define CCK_PD_TYPE1_LV4_TH 0xed
+#define REG_AGC_RPT 0xa80
+#define AGC_RPT_CCK BIT(7)
+
#define REG_CONFIG_ANT_A 0x0b68
#define REG_CONFIG_ANT_B 0x0b6c
--
2.38.0
According to commit 60d7900dcb98 ("wlcore: enable
IEEE80211_HW_SUPPORT_FAST_XMIT"), we can use this because all the chips
have hardware rate control.
This is one of the things mac80211 requires before it will handle MSDU
aggregation for us.
Signed-off-by: Bitterblue Smith <[email protected]>
---
v4:
- Rebased on top of wireless-next.
v3:
- No change.
v2:
- No change.
---
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 823e50811b0d..58e6416787df 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -6998,6 +6998,7 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
* The firmware handles rate control
*/
ieee80211_hw_set(hw, HAS_RATE_CONTROL);
+ ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
ieee80211_hw_set(hw, AMPDU_AGGREGATION);
wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
--
2.38.0
The chip cut, also known as the chip version, is a letter from A (0)
to P (15). Recognise them all instead of printing "unknown" when it's
greater than E.
Signed-off-by: Bitterblue Smith <[email protected]>
---
v4:
- Rebased on top of wireless-next.
v3:
- No change.
v2:
- Suggestion from Ping-Ke Shih:
- Don't use array of letters.
---
.../wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 26 ++++---------------
1 file changed, 5 insertions(+), 21 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 51cb22ee55cd..823e50811b0d 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -1574,30 +1574,14 @@ rtl8xxxu_set_spec_sifs(struct rtl8xxxu_priv *priv, u16 cck, u16 ofdm)
static void rtl8xxxu_print_chipinfo(struct rtl8xxxu_priv *priv)
{
struct device *dev = &priv->udev->dev;
- char *cut;
+ char cut = '?';
- switch (priv->chip_cut) {
- case 0:
- cut = "A";
- break;
- case 1:
- cut = "B";
- break;
- case 2:
- cut = "C";
- break;
- case 3:
- cut = "D";
- break;
- case 4:
- cut = "E";
- break;
- default:
- cut = "unknown";
- }
+ /* Currently always true: chip_cut is 4 bits. */
+ if (priv->chip_cut <= 15)
+ cut = 'A' + priv->chip_cut;
dev_info(dev,
- "RTL%s rev %s (%s) %iT%iR, TX queues %i, WiFi=%i, BT=%i, GPS=%i, HI PA=%i\n",
+ "RTL%s rev %c (%s) %iT%iR, TX queues %i, WiFi=%i, BT=%i, GPS=%i, HI PA=%i\n",
priv->chip_name, cut, priv->chip_vendor, priv->tx_paths,
priv->rx_paths, priv->ep_tx_count, priv->has_wifi,
priv->has_bluetooth, priv->has_gps, priv->hi_pa);
--
2.38.0
Replace two instances of bare pr_info with dev_info and dev_warn.
Also make their messages a little more informative.
Signed-off-by: Bitterblue Smith <[email protected]>
---
v4:
- Rebased on top of wireless-next.
- Feedback from Kalle Valo:
- Change one dev_info into dev_warn.
v3:
- No change.
v2:
- No change.
---
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 58e6416787df..019f8ddd418b 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -2015,7 +2015,8 @@ static int rtl8xxxu_download_firmware(struct rtl8xxxu_priv *priv)
val8 = rtl8xxxu_read8(priv, REG_MCU_FW_DL);
if (val8 & MCU_FW_RAM_SEL) {
- pr_info("do the RAM reset\n");
+ dev_info(&priv->udev->dev,
+ "Firmware is already running, resetting the MCU.\n");
rtl8xxxu_write8(priv, REG_MCU_FW_DL, 0x00);
priv->fops->reset_8051(priv);
}
@@ -5413,7 +5414,8 @@ static void rtl8xxxu_rx_urb_work(struct work_struct *work)
rtl8xxxu_queue_rx_urb(priv, rx_urb);
break;
default:
- pr_info("failed to requeue urb %i\n", ret);
+ dev_warn(&priv->udev->dev,
+ "failed to requeue urb with error %i\n", ret);
skb = (struct sk_buff *)rx_urb->urb.context;
dev_kfree_skb(skb);
usb_free_urb(&rx_urb->urb);
--
2.38.0
Bitterblue Smith <[email protected]> wrote:
> According to Realtek programmers, "to adjust oscillator to align
> central frequency of connected AP. Then, it can yield better
> performance." From commit fb8517f4fade ("rtw88: 8822c: add CFO
> tracking").
>
> The RTL8192CU and a version of RTL8723AU apparently don't have the
> ability to adjust the oscillator, so this doesn't apply to them.
>
> This also doesn't apply to the wifi + bluetooth combo chips (RTL8723AU
> and RTL8723BU) because the CFO tracking should only be done when
> bluetooth is disabled, and determining that looked complicated.
>
> That leaves only the RTL8192EU and RTL8188FU chips. I tested this with
> the latter.
>
> Signed-off-by: Bitterblue Smith <[email protected]>
5 patches applied to wireless-next.git, thanks.
57b328bc7996 wifi: rtl8xxxu: Add central frequency offset tracking
2ad2a813b803 wifi: rtl8xxxu: Fix the CCK RSSI calculation
7b0ac469e331 wifi: rtl8xxxu: Recognise all possible chip cuts
e952deaa95ba wifi: rtl8xxxu: Set IEEE80211_HW_SUPPORT_FAST_XMIT
bd954a7e4aa0 wifi: rtl8xxxu: Use dev_* instead of pr_info
--
https://patchwork.kernel.org/project/linux-wireless/patch/[email protected]/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches