From 5882da02e9d9089b7e8c739f3e774aaeeff8b7ba Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 8 Apr 2011 20:13:18 +0200 Subject: ath9k_hw: fix stopping rx DMA during resets During PHY errors, the MAC can sometimes fail to enter an idle state on older hardware (before AR9380) after an rx stop has been requested. This typically shows up in the kernel log with messages like these: ath: Could not stop RX, we could be confusing the DMA engine when we start RX up ------------[ cut here ]------------ WARNING: at drivers/net/wireless/ath/ath9k/recv.c:504 ath_stoprecv+0xcc/0xf0 [ath9k]() Call Trace: [<8023f0e8>] dump_stack+0x8/0x34 [<80075050>] warn_slowpath_common+0x78/0xa4 [<80075094>] warn_slowpath_null+0x18/0x24 [<80d66d60>] ath_stoprecv+0xcc/0xf0 [ath9k] [<80d642cc>] ath_set_channel+0xbc/0x270 [ath9k] [<80d65254>] ath_radio_disable+0x4a4/0x7fc [ath9k] When this happens, the state that the MAC enters is easy to identify and does not result in bogus DMA traffic, however to ensure a working state after a channel change, the hardware should still be reset. This patch adds detection for this specific MAC state, after which the above warnings completely disappear in my tests. Signed-off-by: Felix Fietkau Cc: stable@kernel.org Cc: Kyungwan Nam Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/hw.c | 9 --------- drivers/net/wireless/ath/ath9k/mac.c | 25 ++++++++++++++++++++++--- drivers/net/wireless/ath/ath9k/mac.h | 2 +- drivers/net/wireless/ath/ath9k/recv.c | 6 +++--- 4 files changed, 26 insertions(+), 16 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 1ec9bcd..c95bc5c 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1254,15 +1254,6 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan, ah->txchainmask = common->tx_chainmask; ah->rxchainmask = common->rx_chainmask; - if ((common->bus_ops->ath_bus_type != ATH_USB) && !ah->chip_fullsleep) { - ath9k_hw_abortpcurecv(ah); - if (!ath9k_hw_stopdmarecv(ah)) { - ath_dbg(common, ATH_DBG_XMIT, - "Failed to stop receive dma\n"); - bChannelChange = false; - } - } - if (!ath9k_hw_setpower(ah, ATH9K_PM_AWAKE)) return -EIO; diff --git a/drivers/net/wireless/ath/ath9k/mac.c b/drivers/net/wireless/ath/ath9k/mac.c index 562257a..edc1cbb 100644 --- a/drivers/net/wireless/ath/ath9k/mac.c +++ b/drivers/net/wireless/ath/ath9k/mac.c @@ -751,28 +751,47 @@ void ath9k_hw_abortpcurecv(struct ath_hw *ah) } EXPORT_SYMBOL(ath9k_hw_abortpcurecv); -bool ath9k_hw_stopdmarecv(struct ath_hw *ah) +bool ath9k_hw_stopdmarecv(struct ath_hw *ah, bool *reset) { #define AH_RX_STOP_DMA_TIMEOUT 10000 /* usec */ #define AH_RX_TIME_QUANTUM 100 /* usec */ struct ath_common *common = ath9k_hw_common(ah); + u32 mac_status, last_mac_status = 0; int i; + /* Enable access to the DMA observation bus */ + REG_WRITE(ah, AR_MACMISC, + ((AR_MACMISC_DMA_OBS_LINE_8 << AR_MACMISC_DMA_OBS_S) | + (AR_MACMISC_MISC_OBS_BUS_1 << + AR_MACMISC_MISC_OBS_BUS_MSB_S))); + REG_WRITE(ah, AR_CR, AR_CR_RXD); /* Wait for rx enable bit to go low */ for (i = AH_RX_STOP_DMA_TIMEOUT / AH_TIME_QUANTUM; i != 0; i--) { if ((REG_READ(ah, AR_CR) & AR_CR_RXE) == 0) break; + + if (!AR_SREV_9300_20_OR_LATER(ah)) { + mac_status = REG_READ(ah, AR_DMADBG_7) & 0x7f0; + if (mac_status == 0x1c0 && mac_status == last_mac_status) { + *reset = true; + break; + } + + last_mac_status = mac_status; + } + udelay(AH_TIME_QUANTUM); } if (i == 0) { ath_err(common, - "DMA failed to stop in %d ms AR_CR=0x%08x AR_DIAG_SW=0x%08x\n", + "DMA failed to stop in %d ms AR_CR=0x%08x AR_DIAG_SW=0x%08x DMADBG_7=0x%08x\n", AH_RX_STOP_DMA_TIMEOUT / 1000, REG_READ(ah, AR_CR), - REG_READ(ah, AR_DIAG_SW)); + REG_READ(ah, AR_DIAG_SW), + REG_READ(ah, AR_DMADBG_7)); return false; } else { return true; diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h index b2b2ff8..c2a5938 100644 --- a/drivers/net/wireless/ath/ath9k/mac.h +++ b/drivers/net/wireless/ath/ath9k/mac.h @@ -695,7 +695,7 @@ bool ath9k_hw_setrxabort(struct ath_hw *ah, bool set); void ath9k_hw_putrxbuf(struct ath_hw *ah, u32 rxdp); void ath9k_hw_startpcureceive(struct ath_hw *ah, bool is_scanning); void ath9k_hw_abortpcurecv(struct ath_hw *ah); -bool ath9k_hw_stopdmarecv(struct ath_hw *ah); +bool ath9k_hw_stopdmarecv(struct ath_hw *ah, bool *reset); int ath9k_hw_beaconq_setup(struct ath_hw *ah); /* Interrupt Handling */ diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index a9c3f46..dcd19bc 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -486,12 +486,12 @@ start_recv: bool ath_stoprecv(struct ath_softc *sc) { struct ath_hw *ah = sc->sc_ah; - bool stopped; + bool stopped, reset = false; spin_lock_bh(&sc->rx.rxbuflock); ath9k_hw_abortpcurecv(ah); ath9k_hw_setrxfilter(ah, 0); - stopped = ath9k_hw_stopdmarecv(ah); + stopped = ath9k_hw_stopdmarecv(ah, &reset); if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ath_edma_stop_recv(sc); @@ -506,7 +506,7 @@ bool ath_stoprecv(struct ath_softc *sc) "confusing the DMA engine when we start RX up\n"); ATH_DBG_WARN_ON_ONCE(!stopped); } - return stopped; + return stopped || reset; } void ath_flushrecv(struct ath_softc *sc) -- cgit v1.1 From 50f6871218802be528961e24487f00c203a5c3c7 Mon Sep 17 00:00:00 2001 From: Sujith Manoharan Date: Mon, 11 Apr 2011 22:56:55 +0530 Subject: ath9k_htc: Fix ethtool reporting Pass the correct module name and device interface so that ethtool can display the proper values. The firmware version will be fixed later on when the FW can actually report a version. :) Reported-by: Richard Farina Signed-off-by: Sujith Manoharan Tested-by: Richard Farina Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/hif_usb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c index f1b8af6..2d10239 100644 --- a/drivers/net/wireless/ath/ath9k/hif_usb.c +++ b/drivers/net/wireless/ath/ath9k/hif_usb.c @@ -1040,7 +1040,7 @@ static int ath9k_hif_usb_probe(struct usb_interface *interface, } ret = ath9k_htc_hw_init(hif_dev->htc_handle, - &hif_dev->udev->dev, hif_dev->device_id, + &interface->dev, hif_dev->device_id, hif_dev->udev->product, id->driver_info); if (ret) { ret = -EINVAL; @@ -1158,7 +1158,7 @@ fail_resume: #endif static struct usb_driver ath9k_hif_usb_driver = { - .name = "ath9k_hif_usb", + .name = KBUILD_MODNAME, .probe = ath9k_hif_usb_probe, .disconnect = ath9k_hif_usb_disconnect, #ifdef CONFIG_PM -- cgit v1.1 From 332704a51498a7e29aa92c19dc03f11f80b71bfe Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Wed, 13 Apr 2011 10:56:51 +0200 Subject: iwlegacy: fix tx_power initialization priv->tx_power_next is not initialized to max supported power, but instead default value is used, what cause errors like [ 58.597834] iwl3945 0000:03:00.0: Requested user TXPOWER 15 above upper limit 14. [ 58.597839] iwl3945 0000:03:00.0: Error setting Tx power (-22). if maximum tx power read from the eeprom is smaller than default. In consequence card is unable to initialize properly. Fix the problem and cleanup tx power initialization. Reported-and-tested-by: Robin Dong Signed-off-by: Stanislaw Gruszka Signed-off-by: John W. Linville --- drivers/net/wireless/iwlegacy/iwl-3945-hw.h | 2 -- drivers/net/wireless/iwlegacy/iwl-4965-hw.h | 3 --- drivers/net/wireless/iwlegacy/iwl-core.c | 17 +++++++++++------ drivers/net/wireless/iwlegacy/iwl-eeprom.c | 7 ------- drivers/net/wireless/iwlegacy/iwl3945-base.c | 4 ---- drivers/net/wireless/iwlegacy/iwl4965-base.c | 6 ------ 6 files changed, 11 insertions(+), 28 deletions(-) diff --git a/drivers/net/wireless/iwlegacy/iwl-3945-hw.h b/drivers/net/wireless/iwlegacy/iwl-3945-hw.h index 779d3cb..5c3a68d 100644 --- a/drivers/net/wireless/iwlegacy/iwl-3945-hw.h +++ b/drivers/net/wireless/iwlegacy/iwl-3945-hw.h @@ -74,8 +74,6 @@ /* RSSI to dBm */ #define IWL39_RSSI_OFFSET 95 -#define IWL_DEFAULT_TX_POWER 0x0F - /* * EEPROM related constants, enums, and structures. */ diff --git a/drivers/net/wireless/iwlegacy/iwl-4965-hw.h b/drivers/net/wireless/iwlegacy/iwl-4965-hw.h index 08b189c..fc6fa28 100644 --- a/drivers/net/wireless/iwlegacy/iwl-4965-hw.h +++ b/drivers/net/wireless/iwlegacy/iwl-4965-hw.h @@ -804,9 +804,6 @@ struct iwl4965_scd_bc_tbl { #define IWL4965_DEFAULT_TX_RETRY 15 -/* Limit range of txpower output target to be between these values */ -#define IWL4965_TX_POWER_TARGET_POWER_MIN (0) /* 0 dBm: 1 milliwatt */ - /* EEPROM */ #define IWL4965_FIRST_AMPDU_QUEUE 10 diff --git a/drivers/net/wireless/iwlegacy/iwl-core.c b/drivers/net/wireless/iwlegacy/iwl-core.c index a209a0e..2b08efb 100644 --- a/drivers/net/wireless/iwlegacy/iwl-core.c +++ b/drivers/net/wireless/iwlegacy/iwl-core.c @@ -160,6 +160,7 @@ int iwl_legacy_init_geos(struct iwl_priv *priv) struct ieee80211_channel *geo_ch; struct ieee80211_rate *rates; int i = 0; + s8 max_tx_power = 0; if (priv->bands[IEEE80211_BAND_2GHZ].n_bitrates || priv->bands[IEEE80211_BAND_5GHZ].n_bitrates) { @@ -235,8 +236,8 @@ int iwl_legacy_init_geos(struct iwl_priv *priv) geo_ch->flags |= ch->ht40_extension_channel; - if (ch->max_power_avg > priv->tx_power_device_lmt) - priv->tx_power_device_lmt = ch->max_power_avg; + if (ch->max_power_avg > max_tx_power) + max_tx_power = ch->max_power_avg; } else { geo_ch->flags |= IEEE80211_CHAN_DISABLED; } @@ -249,6 +250,10 @@ int iwl_legacy_init_geos(struct iwl_priv *priv) geo_ch->flags); } + priv->tx_power_device_lmt = max_tx_power; + priv->tx_power_user_lmt = max_tx_power; + priv->tx_power_next = max_tx_power; + if ((priv->bands[IEEE80211_BAND_5GHZ].n_channels == 0) && priv->cfg->sku & IWL_SKU_A) { IWL_INFO(priv, "Incorrectly detected BG card as ABG. " @@ -1124,11 +1129,11 @@ int iwl_legacy_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force) if (!priv->cfg->ops->lib->send_tx_power) return -EOPNOTSUPP; - if (tx_power < IWL4965_TX_POWER_TARGET_POWER_MIN) { + /* 0 dBm mean 1 milliwatt */ + if (tx_power < 0) { IWL_WARN(priv, - "Requested user TXPOWER %d below lower limit %d.\n", - tx_power, - IWL4965_TX_POWER_TARGET_POWER_MIN); + "Requested user TXPOWER %d below 1 mW.\n", + tx_power); return -EINVAL; } diff --git a/drivers/net/wireless/iwlegacy/iwl-eeprom.c b/drivers/net/wireless/iwlegacy/iwl-eeprom.c index 04c5648..cb346d1 100644 --- a/drivers/net/wireless/iwlegacy/iwl-eeprom.c +++ b/drivers/net/wireless/iwlegacy/iwl-eeprom.c @@ -471,13 +471,6 @@ int iwl_legacy_init_channel_map(struct iwl_priv *priv) flags & EEPROM_CHANNEL_RADAR)) ? "" : "not "); - /* Set the tx_power_user_lmt to the highest power - * supported by any channel */ - if (eeprom_ch_info[ch].max_power_avg > - priv->tx_power_user_lmt) - priv->tx_power_user_lmt = - eeprom_ch_info[ch].max_power_avg; - ch_info++; } } diff --git a/drivers/net/wireless/iwlegacy/iwl3945-base.c b/drivers/net/wireless/iwlegacy/iwl3945-base.c index 28eb3d8..cc7ebce 100644 --- a/drivers/net/wireless/iwlegacy/iwl3945-base.c +++ b/drivers/net/wireless/iwlegacy/iwl3945-base.c @@ -3825,10 +3825,6 @@ static int iwl3945_init_drv(struct iwl_priv *priv) priv->force_reset[IWL_FW_RESET].reset_duration = IWL_DELAY_NEXT_FORCE_FW_RELOAD; - - priv->tx_power_user_lmt = IWL_DEFAULT_TX_POWER; - priv->tx_power_next = IWL_DEFAULT_TX_POWER; - if (eeprom->version < EEPROM_3945_EEPROM_VERSION) { IWL_WARN(priv, "Unsupported EEPROM version: 0x%04X\n", eeprom->version); diff --git a/drivers/net/wireless/iwlegacy/iwl4965-base.c b/drivers/net/wireless/iwlegacy/iwl4965-base.c index 91b3d8b..d484c36 100644 --- a/drivers/net/wireless/iwlegacy/iwl4965-base.c +++ b/drivers/net/wireless/iwlegacy/iwl4965-base.c @@ -3140,12 +3140,6 @@ static int iwl4965_init_drv(struct iwl_priv *priv) iwl_legacy_init_scan_params(priv); - /* Set the tx_power_user_lmt to the lowest power level - * this value will get overwritten by channel max power avg - * from eeprom */ - priv->tx_power_user_lmt = IWL4965_TX_POWER_TARGET_POWER_MIN; - priv->tx_power_next = IWL4965_TX_POWER_TARGET_POWER_MIN; - ret = iwl_legacy_init_channel_map(priv); if (ret) { IWL_ERR(priv, "initializing regulatory failed: %d\n", ret); -- cgit v1.1