From 95945fe79069ee6b7ccce2b14fb9f8b93db33918 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Sun, 15 Jun 2014 18:29:27 +0200
Subject: [PATCH] various fixups for ath5k, fixing system freezes

---
 drivers/net/wireless/ath/ath5k/base.c     | 3 +++
 drivers/net/wireless/ath/ath5k/dma.c      | 9 +++++++++
 drivers/net/wireless/ath/ath5k/initvals.c | 6 ++++++
 drivers/net/wireless/ath/ath5k/phy.c      | 4 ++--
 drivers/net/wireless/ath/ath5k/reset.c    | 2 ++
 5 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index ef35da8..4b18434 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -751,6 +751,9 @@ ath5k_txbuf_setup(struct ath5k_hw *ah, struct ath5k_buf *bf,
 	bf->skbaddr = dma_map_single(ah->dev, skb->data, skb->len,
 			DMA_TO_DEVICE);
 
+	if (dma_mapping_error(ah->dev, bf->skbaddr))
+		return -ENOSPC;
+
 	ieee80211_get_tx_rates(info->control.vif, (control) ? control->sta : NULL, skb, bf->rates,
 			       ARRAY_SIZE(bf->rates));
 
diff --git a/drivers/net/wireless/ath/ath5k/dma.c b/drivers/net/wireless/ath/ath5k/dma.c
index e6c52f7..72bf600 100644
--- a/drivers/net/wireless/ath/ath5k/dma.c
+++ b/drivers/net/wireless/ath/ath5k/dma.c
@@ -869,10 +869,19 @@ ath5k_hw_dma_init(struct ath5k_hw *ah)
 	 * guess we can tweak it and see how it goes ;-)
 	 */
 	if (ah->ah_version != AR5K_AR5210) {
+#if !defined(CONFIG_ATHEROS_AR71XX) && !defined(CONFIG_ATH79)
 		AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
 			AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_128B);
 		AR5K_REG_WRITE_BITS(ah, AR5K_RXCFG,
 			AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_128B);
+#else
+		/* WAR for AR71xx PCI bug */
+		AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
+			AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_128B);
+		AR5K_REG_WRITE_BITS(ah, AR5K_RXCFG,
+			AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_4B);
+#endif
+
 	}
 
 	/* Pre-enable interrupts on 5211/5212*/
diff --git a/drivers/net/wireless/ath/ath5k/initvals.c b/drivers/net/wireless/ath/ath5k/initvals.c
index ee1c2fa..ba84ab5 100644
--- a/drivers/net/wireless/ath/ath5k/initvals.c
+++ b/drivers/net/wireless/ath/ath5k/initvals.c
@@ -62,8 +62,14 @@ static const struct ath5k_ini ar5210_ini[] = {
 	{ AR5K_IMR,		0 },
 	{ AR5K_IER,		AR5K_IER_DISABLE },
 	{ AR5K_BSR,		0, AR5K_INI_READ },
+#if !defined(CONFIG_ATHEROS_AR71XX) && !defined(CONFIG_ATH79)
 	{ AR5K_TXCFG,		AR5K_DMASIZE_128B },
 	{ AR5K_RXCFG,		AR5K_DMASIZE_128B },
+#else
+	/* WAR for AR71xx PCI bug */
+	{ AR5K_TXCFG,           AR5K_DMASIZE_128B },
+	{ AR5K_RXCFG,           AR5K_DMASIZE_4B },
+#endif
 	{ AR5K_CFG,		AR5K_INIT_CFG },
 	{ AR5K_TOPS,		8 },
 	{ AR5K_RXNOFRM,		8 },
diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index 1a2973b..0fce1c7 100644
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -3709,8 +3709,8 @@ ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
 			AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_CHIRP),
 			AR5K_TPC);
 	} else {
-		ath5k_hw_reg_write(ah, AR5K_PHY_TXPOWER_RATE_MAX |
-			AR5K_TUNE_MAX_TXPOWER, AR5K_PHY_TXPOWER_RATE_MAX);
+		ath5k_hw_reg_write(ah, AR5K_TUNE_MAX_TXPOWER,
+			AR5K_PHY_TXPOWER_RATE_MAX);
 	}
 
 	return 0;
diff --git a/drivers/net/wireless/ath/ath5k/reset.c b/drivers/net/wireless/ath/ath5k/reset.c
index a3399c4..66d0ecc 100644
--- a/drivers/net/wireless/ath/ath5k/reset.c
+++ b/drivers/net/wireless/ath/ath5k/reset.c
@@ -1154,6 +1154,7 @@ ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
 	tsf_lo = 0;
 	mode = 0;
 
+#if 0
 	/*
 	 * Sanity check for fast flag
 	 * Fast channel change only available
@@ -1161,6 +1162,7 @@ ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
 	 */
 	if (fast && (ah->ah_radio != AR5K_RF2413) &&
 	(ah->ah_radio != AR5K_RF5413))
+#endif
 		fast = false;
 
 	/* Disable sleep clock operation
-- 
1.8.5.3