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mac80211: rt2x00: add RXIQ calibration

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Add RXIQ calibration found in mtk driver. With old openwrt builds this gets us ~8Mbps more of RX bandwidth (test with iPA/eLNA layout).
Please try if this makes any difference among various board/RF layouts.

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
This commit is contained in:
Tomislav Požega 2018-01-08 13:43:56 +01:00 committed by John Crispin
parent e125b6abb2
commit 5d1620f29c
1 changed files with 417 additions and 0 deletions
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417
package/kernel/mac80211/patches/rt2x00/985-rt2x00-add-rxiq-calibration.patch Normal file
View file

@ -0,0 +1,417 @@
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -7923,6 +7923,386 @@ void rt2800_rxdcoc_calibration(struct rt
}
EXPORT_SYMBOL_GPL(rt2800_rxdcoc_calibration);
+static u32 rt2800_do_sqrt_accumulation(u32 si) {
+ u32 root, root_pre, bit;
+ char i;
+ bit = 1 << 15;
+ root = 0;
+ for (i = 15; i >= 0; i = i - 1) {
+ root_pre = root + bit;
+ if ((root_pre*root_pre) <= si)
+ root = root_pre;
+ bit = bit >> 1;
+ }
+
+ return root;
+}
+EXPORT_SYMBOL_GPL(rt2800_do_sqrt_accumulation);
+
+void rt2800_rxiq_calibration(struct rt2x00_dev *rt2x00dev) {
+ u8 rfb0r1, rfb0r2, rfb0r42;
+ u8 rfb4r0, rfb4r19;
+ u8 rfb5r3, rfb5r4, rfb5r17, rfb5r18, rfb5r19, rfb5r20;
+ u8 rfb6r0, rfb6r19;
+ u8 rfb7r3, rfb7r4, rfb7r17, rfb7r18, rfb7r19, rfb7r20;
+
+ u8 bbp1, bbp4;
+ u8 bbpr241, bbpr242;
+ u32 i;
+ u8 ch_idx;
+ u8 bbpval;
+ u8 rfval, vga_idx = 0;
+ int mi = 0, mq = 0, si = 0, sq = 0, riq = 0;
+ int sigma_i, sigma_q, r_iq, g_rx;
+ int g_imb;
+ int ph_rx;
+ u32 savemacsysctrl = 0;
+ u32 orig_RF_CONTROL0 = 0;
+ u32 orig_RF_BYPASS0 = 0;
+ u32 orig_RF_CONTROL1 = 0;
+ u32 orig_RF_BYPASS1 = 0;
+ u32 orig_RF_CONTROL3 = 0;
+ u32 orig_RF_BYPASS3 = 0;
+ u32 macstatus, bbpval1 = 0;
+ u8 rf_vga_table[] = {0x20, 0x21, 0x22, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f};
+
+ savemacsysctrl = rt2800_register_read(rt2x00dev, MAC_SYS_CTRL);
+ orig_RF_CONTROL0 = rt2800_register_read(rt2x00dev, RF_CONTROL0);
+ orig_RF_BYPASS0 = rt2800_register_read(rt2x00dev, RF_BYPASS0);
+ orig_RF_CONTROL1 = rt2800_register_read(rt2x00dev, RF_CONTROL1);
+ orig_RF_BYPASS1 = rt2800_register_read(rt2x00dev, RF_BYPASS1);
+ orig_RF_CONTROL3 = rt2800_register_read(rt2x00dev, RF_CONTROL3);
+ orig_RF_BYPASS3 = rt2800_register_read(rt2x00dev, RF_BYPASS3);
+
+ bbp1 = rt2800_bbp_read(rt2x00dev, 1);
+ bbp4 = rt2800_bbp_read(rt2x00dev, 4);
+
+ rt2800_register_write(rt2x00dev, MAC_SYS_CTRL, 0x0);
+
+ for (i = 0; i < 10000; i++) {
+ macstatus = rt2800_register_read(rt2x00dev, MAC_STATUS_CFG);
+ if (macstatus & 0x3)
+ udelay(50);
+ else
+ break;
+ }
+
+ if (i == 10000)
+ rt2x00_warn(rt2x00dev, "Wait MAC Status to MAX !!!\n");
+
+ bbpval = bbp4 & (~0x18);
+ bbpval = bbp4 | 0x00;
+ rt2800_bbp_write(rt2x00dev, 4, bbpval);
+
+ bbpval = rt2800_bbp_read(rt2x00dev, 21);
+ bbpval = bbpval | 1;
+ rt2800_bbp_write(rt2x00dev, 21, bbpval);
+ bbpval = bbpval & 0xfe;
+ rt2800_bbp_write(rt2x00dev, 21, bbpval);
+
+ rt2800_register_write(rt2x00dev, RF_CONTROL1, 0x00000202);
+ rt2800_register_write(rt2x00dev, RF_BYPASS1, 0x00000303);
+ if (test_bit(CAPABILITY_EXTERNAL_PA_TX0, &rt2x00dev->cap_flags)) {
+ rt2800_register_write(rt2x00dev, RF_CONTROL3, 0x0101);
+ } else {
+ rt2800_register_write(rt2x00dev, RF_CONTROL3, 0x0000);
+ }
+ rt2800_register_write(rt2x00dev, RF_BYPASS3, 0xf1f1);
+
+ rfb0r1 = rt2800_rfcsr_read_bank(rt2x00dev, 0, 1);
+ rfb0r2 = rt2800_rfcsr_read_bank(rt2x00dev, 0, 2);
+ rfb0r42 = rt2800_rfcsr_read_bank(rt2x00dev, 0, 42);
+ rfb4r0 = rt2800_rfcsr_read_bank(rt2x00dev, 4, 0);
+ rfb4r19 = rt2800_rfcsr_read_bank(rt2x00dev, 4, 19);
+ rfb5r3 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 3);
+ rfb5r4 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 4);
+ rfb5r17 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 17);
+ rfb5r18 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 18);
+ rfb5r19 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 19);
+ rfb5r20 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 20);
+
+ rfb6r0 = rt2800_rfcsr_read_bank(rt2x00dev, 6, 0);
+ rfb6r19 = rt2800_rfcsr_read_bank(rt2x00dev, 6, 19);
+ rfb7r3 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 3);
+ rfb7r4 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 4);
+ rfb7r17 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 17);
+ rfb7r18 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 18);
+ rfb7r19 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 19);
+ rfb7r20 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 20);
+
+ rt2800_rfcsr_write_chanreg(rt2x00dev, 0, 0x87);
+ rt2800_rfcsr_write_chanreg(rt2x00dev, 19, 0x27);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 3, 0x38);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 4, 0x38);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 17, 0x80);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 18, 0xC1);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 19, 0x60);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 20, 0x00);
+
+ rt2800_bbp_write(rt2x00dev, 23, 0x0);
+ rt2800_bbp_write(rt2x00dev, 24, 0x0);
+
+ rt2800_bbp_dcoc_write(rt2x00dev, 5, 0x0);
+
+ bbpr241 = rt2800_bbp_read(rt2x00dev, 241);
+ bbpr242 = rt2800_bbp_read(rt2x00dev, 242);
+
+ rt2800_bbp_write(rt2x00dev, 241, 0x10);
+ rt2800_bbp_write(rt2x00dev, 242, 0x84);
+ rt2800_bbp_write(rt2x00dev, 244, 0x31);
+
+ bbpval = rt2800_bbp_dcoc_read(rt2x00dev, 3);
+ bbpval = bbpval & (~0x7);
+ rt2800_bbp_dcoc_write(rt2x00dev, 3, bbpval);
+
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00000004);
+ udelay(1);
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00000006);
+ usleep_range(1, 200);
+ rt2800_register_write(rt2x00dev, RF_BYPASS0, 0x00003376);
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00001006);
+ udelay(1);
+ if (test_bit(CAPABILITY_EXTERNAL_PA_TX0, &rt2x00dev->cap_flags)) {
+ rt2800_bbp_write(rt2x00dev, 23, 0x06);
+ rt2800_bbp_write(rt2x00dev, 24, 0x06);
+ } else {
+ rt2800_bbp_write(rt2x00dev, 23, 0x02);
+ rt2800_bbp_write(rt2x00dev, 24, 0x02);
+ }
+
+ for (ch_idx = 0; ch_idx < 2; ch_idx = ch_idx + 1) {
+ if (ch_idx == 0) {
+ rfval = rfb0r1 & (~0x3);
+ rfval = rfb0r1 | 0x1;
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 1, rfval);
+ rfval = rfb0r2 & (~0x33);
+ rfval = rfb0r2 | 0x11;
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 2, rfval);
+ rfval = rfb0r42 & (~0x50);
+ rfval = rfb0r42 | 0x10;
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 42, rfval);
+
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00001006);
+ udelay(1);
+
+ bbpval = bbp1 & (~ 0x18);
+ bbpval = bbpval | 0x00;
+ rt2800_bbp_write(rt2x00dev, 1, bbpval);
+
+ rt2800_bbp_dcoc_write(rt2x00dev, 1, 0x00);
+ } else {
+ rfval = rfb0r1 & (~0x3);
+ rfval = rfb0r1 | 0x2;
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 1, rfval);
+ rfval = rfb0r2 & (~0x33);
+ rfval = rfb0r2 | 0x22;
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 2, rfval);
+ rfval = rfb0r42 & (~0x50);
+ rfval = rfb0r42 | 0x40;
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 42, rfval);
+
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00002006);
+ udelay(1);
+
+ bbpval = bbp1 & (~ 0x18);
+ bbpval = bbpval | 0x08;
+ rt2800_bbp_write(rt2x00dev, 1, bbpval);
+
+ rt2800_bbp_dcoc_write(rt2x00dev, 1, 0x01);
+ }
+ udelay(500);
+
+ vga_idx = 0;
+ while (vga_idx < 11) {
+ rt2800_rfcsr_write_dccal(rt2x00dev, 3, rf_vga_table[vga_idx]);
+ rt2800_rfcsr_write_dccal(rt2x00dev, 4, rf_vga_table[vga_idx]);
+
+ rt2800_bbp_dcoc_write(rt2x00dev, 0, 0x93);
+
+ for (i = 0; i < 10000; i++) {
+ bbpval = rt2800_bbp_read(rt2x00dev, 159);
+ if ((bbpval & 0xff) == 0x93)
+ udelay(50);
+ else
+ break;
+ }
+
+ if ((bbpval & 0xff) == 0x93) {
+ rt2x00_warn(rt2x00dev, "Fatal Error: Calibration doesn't finish");
+ goto restore_value;
+ }
+
+ for (i = 0; i < 5; i++) {
+ u32 bbptemp = 0;
+ u8 value = 0;
+ int result = 0;
+
+ rt2800_bbp_write(rt2x00dev, 158, 0x1e);
+ rt2800_bbp_write(rt2x00dev, 159, i);
+ rt2800_bbp_write(rt2x00dev, 158, 0x22);
+ value = rt2800_bbp_read(rt2x00dev, 159);
+ bbptemp = bbptemp + (value << 24);
+ rt2800_bbp_write(rt2x00dev, 158, 0x21);
+ value = rt2800_bbp_read(rt2x00dev, 159);
+ bbptemp = bbptemp + (value << 16);
+ rt2800_bbp_write(rt2x00dev, 158, 0x20);
+ value = rt2800_bbp_read(rt2x00dev, 159);
+ bbptemp = bbptemp + (value << 8);
+ rt2800_bbp_write(rt2x00dev, 158, 0x1f);
+ value = rt2800_bbp_read(rt2x00dev, 159);
+ bbptemp = bbptemp + value;
+
+ if ((i < 2) && (bbptemp & 0x800000))
+ result = (bbptemp & 0xffffff) - 0x1000000;
+ else if (i == 4)
+ result = bbptemp;
+ else
+ result = bbptemp;
+
+ if (i == 0)
+ mi = result/4096;
+ else if (i == 1)
+ mq = result/4096;
+ else if (i == 2)
+ si = bbptemp/4096;
+ else if (i == 3)
+ sq = bbptemp/4096;
+ else
+ riq = result/4096;
+ }
+
+ bbpval1 = si - mi*mi;
+ rt2x00_dbg(rt2x00dev, "RXIQ si=%d, sq=%d, riq=%d, bbpval %d, vga_idx %d", si, sq, riq, bbpval1, vga_idx);
+
+ if (bbpval1 >= (100*100))
+ break;
+
+ if (bbpval1 <= 100)
+ vga_idx = vga_idx + 9;
+ else if (bbpval1 <= 158)
+ vga_idx = vga_idx + 8;
+ else if (bbpval1 <= 251)
+ vga_idx = vga_idx + 7;
+ else if (bbpval1 <= 398)
+ vga_idx = vga_idx + 6;
+ else if (bbpval1 <= 630)
+ vga_idx = vga_idx + 5;
+ else if (bbpval1 <= 1000)
+ vga_idx = vga_idx + 4;
+ else if (bbpval1 <= 1584)
+ vga_idx = vga_idx + 3;
+ else if (bbpval1 <= 2511)
+ vga_idx = vga_idx + 2;
+ else
+ vga_idx = vga_idx + 1;
+ }
+
+ sigma_i = rt2800_do_sqrt_accumulation(100*(si - mi*mi));
+ sigma_q = rt2800_do_sqrt_accumulation(100*(sq - mq*mq));
+ r_iq = 10*(riq-(mi*mq));
+
+ rt2x00_dbg(rt2x00dev, "Sigma_i=%d, Sigma_q=%d, R_iq=%d", sigma_i, sigma_q, r_iq);
+
+ if (((sigma_i <= 1400 ) && (sigma_i >= 1000))
+ && ((sigma_i - sigma_q) <= 112)
+ && ((sigma_i - sigma_q) >= -112)
+ && ((mi <= 32) && (mi >= -32))
+ && ((mq <= 32) && (mq >= -32))) {
+ r_iq = 10*(riq-(mi*mq));
+ rt2x00_dbg(rt2x00dev, "RXIQ Sigma_i=%d, Sigma_q=%d, R_iq=%d\n", sigma_i, sigma_q, r_iq);
+
+ g_rx = (1000 * sigma_q) / sigma_i;
+ g_imb = ((-2) * 128 * (1000 - g_rx)) / (1000 + g_rx);
+ ph_rx = (r_iq * 2292) / (sigma_i * sigma_q);
+ rt2x00_info(rt2x00dev, "RXIQ G_imb=%d, Ph_rx=%d\n", g_imb, ph_rx);
+
+ if ((ph_rx > 20) || (ph_rx < -20)) {
+ ph_rx = 0;
+ rt2x00_warn(rt2x00dev, "RXIQ calibration FAIL");
+ }
+
+ if ((g_imb > 12) || (g_imb < -12)) {
+ g_imb = 0;
+ rt2x00_warn(rt2x00dev, "RXIQ calibration FAIL");
+ }
+ }
+ else {
+ g_imb = 0;
+ ph_rx = 0;
+ rt2x00_dbg(rt2x00dev, "RXIQ Sigma_i=%d, Sigma_q=%d, R_iq=%d\n", sigma_i, sigma_q, r_iq);
+ rt2x00_warn(rt2x00dev, "RXIQ calibration FAIL");
+ }
+
+ if (ch_idx == 0) {
+ rt2800_bbp_write(rt2x00dev, 158, 0x37);
+ rt2800_bbp_write(rt2x00dev, 159, g_imb & 0x3f);
+ rt2800_bbp_write(rt2x00dev, 158, 0x35);
+ rt2800_bbp_write(rt2x00dev, 159, ph_rx & 0x3f);
+ } else {
+ rt2800_bbp_write(rt2x00dev, 158, 0x55);
+ rt2800_bbp_write(rt2x00dev, 159, g_imb & 0x3f);
+ rt2800_bbp_write(rt2x00dev, 158, 0x53);
+ rt2800_bbp_write(rt2x00dev, 159, ph_rx & 0x3f);
+ }
+ }
+
+restore_value:
+ rt2800_bbp_write(rt2x00dev, 158, 0x3);
+ bbpval = rt2800_bbp_read(rt2x00dev, 159);
+ rt2800_bbp_write(rt2x00dev, 159, (bbpval | 0x07));
+
+ rt2800_bbp_write(rt2x00dev, 158, 0x00);
+ rt2800_bbp_write(rt2x00dev, 159, 0x00);
+ rt2800_bbp_write(rt2x00dev, 1, bbp1);
+ rt2800_bbp_write(rt2x00dev, 4, bbp4);
+ rt2800_bbp_write(rt2x00dev, 241, bbpr241);
+ rt2800_bbp_write(rt2x00dev, 242, bbpr242);
+
+ rt2800_bbp_write(rt2x00dev, 244, 0x00);
+ bbpval = rt2800_bbp_read(rt2x00dev, 21);
+ bbpval = (bbpval | 0x1);
+ rt2800_bbp_write(rt2x00dev, 21, bbpval);
+ usleep_range(10, 200);
+ bbpval = (bbpval & 0xfe);
+ rt2800_bbp_write(rt2x00dev, 21, bbpval);
+
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 1, rfb0r1);
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 2, rfb0r2);
+ rt2800_rfcsr_write_bank(rt2x00dev, 0, 42, rfb0r42);
+
+ rt2800_rfcsr_write_bank(rt2x00dev, 4, 0, rfb4r0);
+ rt2800_rfcsr_write_bank(rt2x00dev, 4, 19, rfb4r19);
+ rt2800_rfcsr_write_bank(rt2x00dev, 5, 3, rfb5r3);
+ rt2800_rfcsr_write_bank(rt2x00dev, 5, 4, rfb5r4);
+ rt2800_rfcsr_write_bank(rt2x00dev, 5, 17, rfb5r17);
+ rt2800_rfcsr_write_bank(rt2x00dev, 5, 18, rfb5r18);
+ rt2800_rfcsr_write_bank(rt2x00dev, 5, 19, rfb5r19);
+ rt2800_rfcsr_write_bank(rt2x00dev, 5, 20, rfb5r20);
+
+ rt2800_rfcsr_write_bank(rt2x00dev, 6, 0, rfb6r0);
+ rt2800_rfcsr_write_bank(rt2x00dev, 6, 19, rfb6r19);
+ rt2800_rfcsr_write_bank(rt2x00dev, 7, 3, rfb7r3);
+ rt2800_rfcsr_write_bank(rt2x00dev, 7, 4, rfb7r4);
+ rt2800_rfcsr_write_bank(rt2x00dev, 7, 17, rfb7r17);
+ rt2800_rfcsr_write_bank(rt2x00dev, 7, 18, rfb7r18);
+ rt2800_rfcsr_write_bank(rt2x00dev, 7, 19, rfb7r19);
+ rt2800_rfcsr_write_bank(rt2x00dev, 7, 20, rfb7r20);
+
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00000006);
+ udelay(1);
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, 0x00000004);
+ udelay(1);
+ rt2800_register_write(rt2x00dev, RF_CONTROL0, orig_RF_CONTROL0);
+ udelay(1);
+ rt2800_register_write(rt2x00dev, RF_BYPASS0, orig_RF_BYPASS0);
+ rt2800_register_write(rt2x00dev, RF_CONTROL1, orig_RF_CONTROL1);
+ rt2800_register_write(rt2x00dev, RF_BYPASS1, orig_RF_BYPASS1);
+ rt2800_register_write(rt2x00dev, RF_CONTROL3, orig_RF_CONTROL3);
+ rt2800_register_write(rt2x00dev, RF_BYPASS3, orig_RF_BYPASS3);
+ rt2800_register_write(rt2x00dev, MAC_SYS_CTRL, savemacsysctrl);
+}
+EXPORT_SYMBOL_GPL(rt2800_rxiq_calibration);
+
static void rt2800_bbp_core_soft_reset(struct rt2x00_dev *rt2x00dev,
bool set_bw, bool is_ht40)
{
@@ -8535,6 +8915,7 @@ static void rt2800_init_rfcsr_6352(struc
rt2800_rxdcoc_calibration(rt2x00dev);
rt2800_bw_filter_calibration(rt2x00dev, true);
rt2800_bw_filter_calibration(rt2x00dev, false);
+ rt2800_rxiq_calibration(rt2x00dev);
}
static void rt2800_init_rfcsr(struct rt2x00_dev *rt2x00dev)
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.h
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.h
@@ -231,6 +231,7 @@ void rt2800_rf_self_txdc_cal(struct rt2x
int rt2800_calcrcalibrationcode(struct rt2x00_dev *rt2x00dev, int d1, int d2);
void rt2800_r_calibration(struct rt2x00_dev *rt2x00dev);
void rt2800_rxdcoc_calibration(struct rt2x00_dev *rt2x00dev);
+void rt2800_rxiq_calibration(struct rt2x00_dev *rt2x00dev);
int rt2800_enable_radio(struct rt2x00_dev *rt2x00dev);
void rt2800_disable_radio(struct rt2x00_dev *rt2x00dev);
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
@@ -574,6 +574,7 @@ struct rt2x00lib_ops {
int (*calcrcalibrationcode) (struct rt2x00_dev *rt2x00dev, int d1, int d2);
void (*r_calibration) (struct rt2x00_dev *rt2x00dev);
void (*rxdcoc_calibration) (struct rt2x00_dev *rt2x00dev);
+ void (*rxiq_calibration) (struct rt2x00_dev *rt2x00dev);
/*
* Data queue handlers.