openwrtv4/package/kernel/mac80211/patches/611-rt2x00-rf_vals-rt3352-xtal20.patch

--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -8185,6 +8185,27 @@ static const struct rf_channel rf_vals_5
 	{196, 83, 0, 12, 1},
 };
 
+/*
+ * RF value list for rt3xxx with Xtal20MHz
+ * Supports: 2.4 GHz (all) (RF3322)
+ */
+static const struct rf_channel rf_vals_xtal20mhz_3x[] = {
+	{1,    0xE2,	 2,  0x14},
+	{2,    0xE3,	 2,  0x14},
+	{3,    0xE4,	 2,  0x14},
+	{4,    0xE5,	 2,  0x14},
+	{5,    0xE6,	 2,  0x14},
+	{6,    0xE7,	 2,  0x14},
+	{7,    0xE8,	 2,  0x14},
+	{8,    0xE9,	 2,  0x14},
+	{9,    0xEA,	 2,  0x14},
+	{10,   0xEB,	 2,  0x14},
+	{11,   0xEC,	 2,  0x14},
+	{12,   0xED,	 2,  0x14},
+	{13,   0xEE,	 2,  0x14},
+	{14,   0xF0,	 2,  0x18},
+};
+
 static int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
 {
 	struct hw_mode_spec *spec = &rt2x00dev->spec;
@@ -8271,7 +8292,10 @@ static int rt2800_probe_hw_mode(struct r
 	case RF5390:
 	case RF5392:
 		spec->num_channels = 14;
-		spec->channels = rf_vals_3x;
+		if (spec->clk_is_20mhz)
+			spec->channels = rf_vals_xtal20mhz_3x;
+		else
+			spec->channels = rf_vals_3x;
 		break;
 
 	case RF3052:
@@ -8455,6 +8479,19 @@ static int rt2800_probe_rt(struct rt2x00
 	return 0;
 }
 
+int rt2800_probe_clk(struct rt2x00_dev *rt2x00dev)
+{
+	struct rt2x00_platform_data *pdata = rt2x00dev->dev->platform_data;
+	struct hw_mode_spec *spec = &rt2x00dev->spec;
+
+	if (!pdata)
+		return -EINVAL;
+
+	spec->clk_is_20mhz = pdata->clk_is_20mhz;
+
+	return 0;
+}
+
 int rt2800_probe_hw(struct rt2x00_dev *rt2x00dev)
 {
 	struct rt2800_drv_data *drv_data = rt2x00dev->drv_data;
@@ -8497,6 +8534,15 @@ int rt2800_probe_hw(struct rt2x00_dev *r
 	rt2800_register_write(rt2x00dev, GPIO_CTRL, reg);
 
 	/*
+	 * Probe SoC clock.
+	 */
+	if (rt2x00_is_soc(rt2x00dev)) {
+		retval = rt2800_probe_clk(rt2x00dev);
+		if (retval)
+			return retval;
+	}
+
+	/*
 	 * Initialize hw specifications.
 	 */
 	retval = rt2800_probe_hw_mode(rt2x00dev);
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
@@ -400,6 +400,7 @@ static inline struct rt2x00_intf* vif_to
  * @channels: Device/chipset specific channel values (See &struct rf_channel).
  * @channels_info: Additional information for channels (See &struct channel_info).
  * @ht: Driver HT Capabilities (See &ieee80211_sta_ht_cap).
+ * @clk_is_20mhz: External crystal of WiSoC is 20MHz instead of 40MHz
  */
 struct hw_mode_spec {
 	unsigned int supported_bands;
@@ -416,6 +417,7 @@ struct hw_mode_spec {
 	const struct channel_info *channels_info;
 
 	struct ieee80211_sta_ht_cap ht;
+	int clk_is_20mhz;
 };
 
 /*
--- a/include/linux/rt2x00_platform.h
+++ b/include/linux/rt2x00_platform.h
@@ -18,6 +18,7 @@ struct rt2x00_platform_data {
 
 	int disable_2ghz;
 	int disable_5ghz;
+	int clk_is_20mhz;
 };
 
 #endif /* _RT2X00_PLATFORM_H */