From patchwork Sat Sep 17 20:28:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 12979249 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Date: Sat, 17 Sep 2022 21:28:10 +0100 From: Daniel Golle To: linux-wireless@vger.kernel.org, Stanislaw Gruszka , Helmut Schaa Cc: Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Johannes Berg Subject: [PATCH v3 08/16] rt2x00: add RXIQ calibration for MT7620 Message-ID: <033a39a697d51f6df258acea4c33608e0944fe4c.1663445157.git.daniel@makrotopia.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Tomislav Požega Add RXIQ calibration found in mtk driver. With old openwrt builds this gets us ~8Mbps more of RX bandwidth (test with iPA/eLNA layout). Signed-off-by: Tomislav Požega Signed-off-by: Daniel Golle Acked-by: Stanislaw Gruszka --- v2: use rt2800_wait_bbp_rf_ready(), fix indentation .../net/wireless/ralink/rt2x00/rt2800lib.c | 375 ++++++++++++++++++ 1 file changed, 375 insertions(+) --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c @@ -8666,6 +8666,380 @@ static void rt2800_rxdcoc_calibration(st rt2800_rfcsr_write_bank(rt2x00dev, 0, 2, saverfb0r2); } +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; +} + +static 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 bbpval1 = 0; + static const 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); + + if (unlikely(rt2800_wait_bbp_rf_ready(rt2x00dev, MAC_STATUS_CFG_BBP_RF_BUSY))) + rt2x00_warn(rt2x00dev, "Timeout waiting for MAC status in RXIQ calibration\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); + } + usleep_range(500, 1500); + + 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) + usleep_range(50, 100); + 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); + + 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 |= 0x1; + rt2800_bbp_write(rt2x00dev, 21, bbpval); + usleep_range(10, 200); + 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); +} + static void rt2800_bbp_core_soft_reset(struct rt2x00_dev *rt2x00dev, bool set_bw, bool is_ht40) { @@ -9278,6 +9652,7 @@ 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)