From 5f0c04ea1e7394c2b28fa247c1722487f9a77523 Mon Sep 17 00:00:00 2001 From: Rajkumar Manoharan Date: Thu, 13 Oct 2011 11:00:35 +0530 Subject: [PATCH] ath9k_hw: Improve fast channel change for AR9003 chips In order to reduce the overall scan time, fast channel change should be implemented properly. This patch adds fast channel change support across band switch or channel mode switch instead of doing full chip reset. During the fastcc, tx iqcal measurements are preserved and will be reloaded after successful the channel change. This patch also addressed fast channel issue where the STA can not see APs in higher than operating channel on 5GHz band after the association. Cc: Paul Stewart Signed-off-by: Rajkumar Manoharan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ar9003_calib.c | 72 +++++++++++++++++-- drivers/net/wireless/ath/ath9k/ar9003_phy.c | 69 ++++++++++++++++++ drivers/net/wireless/ath/ath9k/ar9003_phy.h | 3 + drivers/net/wireless/ath/ath9k/hw-ops.h | 7 ++ drivers/net/wireless/ath/ath9k/hw.c | 32 +++++++++ drivers/net/wireless/ath/ath9k/hw.h | 8 +++ 6 files changed, 186 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9003_calib.c b/drivers/net/wireless/ath/ath9k/ar9003_calib.c index e4b1a8300854..026aa5b833d2 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_calib.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_calib.c @@ -18,7 +18,7 @@ #include "hw-ops.h" #include "ar9003_phy.h" -#define MAX_MEASUREMENT 8 +#define MAX_MEASUREMENT MAX_IQCAL_MEASUREMENT #define MAX_MAG_DELTA 11 #define MAX_PHS_DELTA 10 @@ -663,6 +663,7 @@ static void ar9003_hw_tx_iqcal_load_avg_2_passes(struct ath_hw *ah, { int i, im, nmeasurement; u32 tx_corr_coeff[MAX_MEASUREMENT][AR9300_MAX_CHAINS]; + struct ath9k_hw_cal_data *caldata = ah->caldata; memset(tx_corr_coeff, 0, sizeof(tx_corr_coeff)); for (i = 0; i < MAX_MEASUREMENT / 2; i++) { @@ -712,13 +713,21 @@ static void ar9003_hw_tx_iqcal_load_avg_2_passes(struct ath_hw *ah, REG_RMW_FIELD(ah, tx_corr_coeff[im][i], AR_PHY_TX_IQCAL_CORR_COEFF_01_COEFF_TABLE, coeff->iqc_coeff[0]); + + if (caldata) + caldata->tx_corr_coeff[im][i] = + coeff->iqc_coeff[0]; } + if (caldata) + caldata->num_measures[i] = nmeasurement; } REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_3, AR_PHY_TX_IQCAL_CONTROL_3_IQCORR_EN, 0x1); REG_RMW_FIELD(ah, AR_PHY_RX_IQCAL_CORR_B0, AR_PHY_RX_IQCAL_CORR_B0_LOOPBACK_IQCORR_EN, 0x1); + if (caldata) + caldata->done_txiqcal_once = true; return; @@ -845,10 +854,55 @@ static void ar9003_hw_tx_iq_cal_post_proc(struct ath_hw *ah) ath_dbg(common, ATH_DBG_CALIBRATE, "Tx IQ Cal failed\n"); return; } + +static void ar9003_hw_tx_iq_cal_reload(struct ath_hw *ah) +{ + struct ath9k_hw_cal_data *caldata = ah->caldata; + u32 tx_corr_coeff[MAX_MEASUREMENT][AR9300_MAX_CHAINS]; + int i, im; + + memset(tx_corr_coeff, 0, sizeof(tx_corr_coeff)); + for (i = 0; i < MAX_MEASUREMENT / 2; i++) { + tx_corr_coeff[i * 2][0] = tx_corr_coeff[(i * 2) + 1][0] = + AR_PHY_TX_IQCAL_CORR_COEFF_B0(i); + if (!AR_SREV_9485(ah)) { + tx_corr_coeff[i * 2][1] = + tx_corr_coeff[(i * 2) + 1][1] = + AR_PHY_TX_IQCAL_CORR_COEFF_B1(i); + + tx_corr_coeff[i * 2][2] = + tx_corr_coeff[(i * 2) + 1][2] = + AR_PHY_TX_IQCAL_CORR_COEFF_B2(i); + } + } + + for (i = 0; i < AR9300_MAX_CHAINS; i++) { + if (!(ah->txchainmask & (1 << i))) + continue; + + for (im = 0; im < caldata->num_measures[i]; im++) { + if ((im % 2) == 0) + REG_RMW_FIELD(ah, tx_corr_coeff[im][i], + AR_PHY_TX_IQCAL_CORR_COEFF_00_COEFF_TABLE, + caldata->tx_corr_coeff[im][i]); + else + REG_RMW_FIELD(ah, tx_corr_coeff[im][i], + AR_PHY_TX_IQCAL_CORR_COEFF_01_COEFF_TABLE, + caldata->tx_corr_coeff[im][i]); + } + } + + REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_3, + AR_PHY_TX_IQCAL_CONTROL_3_IQCORR_EN, 0x1); + REG_RMW_FIELD(ah, AR_PHY_RX_IQCAL_CORR_B0, + AR_PHY_RX_IQCAL_CORR_B0_LOOPBACK_IQCORR_EN, 0x1); +} + static bool ar9003_hw_init_cal(struct ath_hw *ah, struct ath9k_channel *chan) { struct ath_common *common = ath9k_hw_common(ah); + struct ath9k_hw_cal_data *caldata = ah->caldata; bool txiqcal_done = false; /* Do Tx IQ Calibration */ @@ -860,9 +914,15 @@ static bool ar9003_hw_init_cal(struct ath_hw *ah, * For AR9485 or later chips, TxIQ cal runs as part of * AGC calibration */ - if (AR_SREV_9485_OR_LATER(ah)) + if (AR_SREV_9485_OR_LATER(ah) && !AR_SREV_9340(ah)) { + if (caldata && !caldata->done_txiqcal_once) + REG_SET_BIT(ah, AR_PHY_TX_IQCAL_CONTROL_0, + AR_PHY_TX_IQCAL_CONTROL_0_ENABLE_TXIQ_CAL); + else + REG_CLR_BIT(ah, AR_PHY_TX_IQCAL_CONTROL_0, + AR_PHY_TX_IQCAL_CONTROL_0_ENABLE_TXIQ_CAL); txiqcal_done = true; - else { + } else { txiqcal_done = ar9003_hw_tx_iq_cal_run(ah); REG_WRITE(ah, AR_PHY_ACTIVE, AR_PHY_ACTIVE_DIS); udelay(5); @@ -884,6 +944,8 @@ static bool ar9003_hw_init_cal(struct ath_hw *ah, if (txiqcal_done) ar9003_hw_tx_iq_cal_post_proc(ah); + else if (caldata && caldata->done_txiqcal_once) + ar9003_hw_tx_iq_cal_reload(ah); ath9k_hw_loadnf(ah, chan); ath9k_hw_start_nfcal(ah, true); @@ -912,8 +974,8 @@ static bool ar9003_hw_init_cal(struct ath_hw *ah, if (ah->cal_list_curr) ath9k_hw_reset_calibration(ah, ah->cal_list_curr); - if (ah->caldata) - ah->caldata->CalValid = 0; + if (caldata) + caldata->CalValid = 0; return true; } diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c index 779f407222ed..4e31d655c4ea 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c @@ -688,6 +688,7 @@ static int ar9003_hw_process_ini(struct ath_hw *ah, if (AR_SREV_9480(ah)) ar9003_hw_prog_ini(ah, &ah->ini_BTCOEX_MAX_TXPWR, 1); + ah->modes_index = modesIndex; ar9003_hw_override_ini(ah); ar9003_hw_set_channel_regs(ah, chan); ar9003_hw_set_chain_masks(ah, ah->rxchainmask, ah->txchainmask); @@ -1247,6 +1248,73 @@ static void ar9003_hw_antdiv_comb_conf_set(struct ath_hw *ah, REG_WRITE(ah, AR_PHY_MC_GAIN_CTRL, regval); } +static int ar9003_hw_fast_chan_change(struct ath_hw *ah, + struct ath9k_channel *chan, + u8 *ini_reloaded) +{ + unsigned int regWrites = 0; + u32 modesIndex; + + switch (chan->chanmode) { + case CHANNEL_A: + case CHANNEL_A_HT20: + modesIndex = 1; + break; + case CHANNEL_A_HT40PLUS: + case CHANNEL_A_HT40MINUS: + modesIndex = 2; + break; + case CHANNEL_G: + case CHANNEL_G_HT20: + case CHANNEL_B: + modesIndex = 4; + break; + case CHANNEL_G_HT40PLUS: + case CHANNEL_G_HT40MINUS: + modesIndex = 3; + break; + + default: + return -EINVAL; + } + + if (modesIndex == ah->modes_index) { + *ini_reloaded = false; + goto set_rfmode; + } + + ar9003_hw_prog_ini(ah, &ah->iniSOC[ATH_INI_POST], modesIndex); + ar9003_hw_prog_ini(ah, &ah->iniMac[ATH_INI_POST], modesIndex); + ar9003_hw_prog_ini(ah, &ah->iniBB[ATH_INI_POST], modesIndex); + ar9003_hw_prog_ini(ah, &ah->iniRadio[ATH_INI_POST], modesIndex); + if (AR_SREV_9480_20(ah)) + ar9003_hw_prog_ini(ah, + &ah->ini_radio_post_sys2ant, + modesIndex); + + REG_WRITE_ARRAY(&ah->iniModesTxGain, modesIndex, regWrites); + + /* + * For 5GHz channels requiring Fast Clock, apply + * different modal values. + */ + if (IS_CHAN_A_FAST_CLOCK(ah, chan)) + REG_WRITE_ARRAY(&ah->iniModesAdditional, modesIndex, regWrites); + + if (AR_SREV_9330(ah)) + REG_WRITE_ARRAY(&ah->iniModesAdditional, 1, regWrites); + + if (AR_SREV_9340(ah) && !ah->is_clk_25mhz) + REG_WRITE_ARRAY(&ah->iniModesAdditional_40M, 1, regWrites); + + ah->modes_index = modesIndex; + *ini_reloaded = true; + +set_rfmode: + ar9003_hw_set_rfmode(ah, chan); + return 0; +} + void ar9003_hw_attach_phy_ops(struct ath_hw *ah) { struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah); @@ -1275,6 +1343,7 @@ void ar9003_hw_attach_phy_ops(struct ath_hw *ah) priv_ops->do_getnf = ar9003_hw_do_getnf; priv_ops->ani_cache_ini_regs = ar9003_hw_ani_cache_ini_regs; priv_ops->set_radar_params = ar9003_hw_set_radar_params; + priv_ops->fast_chan_change = ar9003_hw_fast_chan_change; ops->antdiv_comb_conf_get = ar9003_hw_antdiv_comb_conf_get; ops->antdiv_comb_conf_set = ar9003_hw_antdiv_comb_conf_set; diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.h b/drivers/net/wireless/ath/ath9k/ar9003_phy.h index 6cea546a1507..c6ed51fb6858 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_phy.h +++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.h @@ -572,6 +572,8 @@ #define AR_PHY_TXGAIN_TABLE (AR_SM_BASE + 0x300) +#define AR_PHY_TX_IQCAL_CONTROL_0 (AR_SM_BASE + AR_SREV_9485(ah) ? \ + 0x3c4 : 0x444) #define AR_PHY_TX_IQCAL_CONTROL_1 (AR_SM_BASE + AR_SREV_9485(ah) ? \ 0x3c8 : 0x448) #define AR_PHY_TX_IQCAL_START (AR_SM_BASE + AR_SREV_9485(ah) ? \ @@ -823,6 +825,7 @@ #define AR_PHY_SPECTRAL_SCAN_SHORT_REPEAT 0x01000000 #define AR_PHY_SPECTRAL_SCAN_SHORT_REPEAT_S 24 #define AR_PHY_CHANNEL_STATUS_RX_CLEAR 0x00000004 +#define AR_PHY_TX_IQCAL_CONTROL_0_ENABLE_TXIQ_CAL 0x80000000 #define AR_PHY_TX_IQCAL_CONTROL_1_IQCORR_I_Q_COFF_DELPT 0x01fc0000 #define AR_PHY_TX_IQCAL_CONTROL_1_IQCORR_I_Q_COFF_DELPT_S 18 #define AR_PHY_TX_IQCAL_START_DO_CAL 0x00000001 diff --git a/drivers/net/wireless/ath/ath9k/hw-ops.h b/drivers/net/wireless/ath/ath9k/hw-ops.h index e9782d164962..e74c233757a2 100644 --- a/drivers/net/wireless/ath/ath9k/hw-ops.h +++ b/drivers/net/wireless/ath/ath9k/hw-ops.h @@ -205,4 +205,11 @@ static inline void ath9k_hw_setup_calibration(struct ath_hw *ah, ath9k_hw_private_ops(ah)->setup_calibration(ah, currCal); } +static inline int ath9k_hw_fast_chan_change(struct ath_hw *ah, + struct ath9k_channel *chan, + u8 *ini_reloaded) +{ + return ath9k_hw_private_ops(ah)->fast_chan_change(ah, chan, + ini_reloaded); +} #endif /* ATH9K_HW_OPS_H */ diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 58794a4e40ad..e51d93d33d5f 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1394,6 +1394,14 @@ static bool ath9k_hw_channel_change(struct ath_hw *ah, struct ath_common *common = ath9k_hw_common(ah); u32 qnum; int r; + bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); + bool band_switch, mode_diff; + u8 ini_reloaded; + + band_switch = (chan->channelFlags & (CHANNEL_2GHZ | CHANNEL_5GHZ)) != + (ah->curchan->channelFlags & (CHANNEL_2GHZ | + CHANNEL_5GHZ)); + mode_diff = (chan->chanmode != ah->curchan->chanmode); for (qnum = 0; qnum < AR_NUM_QCU; qnum++) { if (ath9k_hw_numtxpending(ah, qnum)) { @@ -1408,6 +1416,18 @@ static bool ath9k_hw_channel_change(struct ath_hw *ah, return false; } + if (edma && (band_switch || mode_diff)) { + ath9k_hw_mark_phy_inactive(ah); + udelay(5); + + ath9k_hw_init_pll(ah, NULL); + + if (ath9k_hw_fast_chan_change(ah, chan, &ini_reloaded)) { + ath_err(common, "Failed to do fast channel change\n"); + return false; + } + } + ath9k_hw_set_channel_regs(ah, chan); r = ath9k_hw_rf_set_freq(ah, chan); @@ -1424,6 +1444,16 @@ static bool ath9k_hw_channel_change(struct ath_hw *ah, ath9k_hw_spur_mitigate_freq(ah, chan); + if (edma && (band_switch || mode_diff)) { + if (band_switch || ini_reloaded) + ah->eep_ops->set_board_values(ah, chan); + + ath9k_hw_init_bb(ah, chan); + + if (band_switch || ini_reloaded) + ath9k_hw_init_cal(ah, chan); + } + return true; } @@ -1677,6 +1707,8 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan, ath9k_hw_init_bb(ah, chan); + if (caldata) + caldata->done_txiqcal_once = false; if (!ath9k_hw_init_cal(ah, chan)) return -EIO; diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h index 684c33c4897c..e5c458d22c82 100644 --- a/drivers/net/wireless/ath/ath9k/hw.h +++ b/drivers/net/wireless/ath/ath9k/hw.h @@ -337,6 +337,8 @@ enum ath9k_int { CHANNEL_HT40PLUS | \ CHANNEL_HT40MINUS) +#define MAX_IQCAL_MEASUREMENT 8 + struct ath9k_hw_cal_data { u16 channel; u32 channelFlags; @@ -346,8 +348,11 @@ struct ath9k_hw_cal_data { bool paprd_done; bool nfcal_pending; bool nfcal_interference; + bool done_txiqcal_once; u16 small_signal_gain[AR9300_MAX_CHAINS]; u32 pa_table[AR9300_MAX_CHAINS][PAPRD_TABLE_SZ]; + u32 num_measures[AR9300_MAX_CHAINS]; + int tx_corr_coeff[MAX_IQCAL_MEASUREMENT][AR9300_MAX_CHAINS]; struct ath9k_nfcal_hist nfCalHist[NUM_NF_READINGS]; }; @@ -583,6 +588,8 @@ struct ath_hw_private_ops { void (*do_getnf)(struct ath_hw *ah, int16_t nfarray[NUM_NF_READINGS]); void (*set_radar_params)(struct ath_hw *ah, struct ath_hw_radar_conf *conf); + int (*fast_chan_change)(struct ath_hw *ah, struct ath9k_channel *chan, + u8 *ini_reloaded); /* ANI */ void (*ani_cache_ini_regs)(struct ath_hw *ah); @@ -684,6 +691,7 @@ struct ath_hw { atomic_t intr_ref_cnt; bool chip_fullsleep; u32 atim_window; + u32 modes_index; /* Calibration */ u32 supp_cals;