ath9k: do a chip reset if noise floor calibration fails, should improve stability

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41113 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 232 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/564-ath9k_cleanup_reset_debug.patch b/package/kernel/mac80211/patches/564-ath9k_cleanup_reset_debug.patch
new file mode 100644
index 0000000000..c636c5aa27
--- /dev/null
+++ b/package/kernel/mac80211/patches/564-ath9k_cleanup_reset_debug.patch
@@ -0,0 +1,60 @@
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -846,36 +846,30 @@ static ssize_t read_file_reset(struct fi
+ 			       size_t count, loff_t *ppos)
+ {
+ 	struct ath_softc *sc = file->private_data;
++	static const char * const reset_cause[__RESET_TYPE_MAX] = {
++		[RESET_TYPE_BB_HANG] = "Baseband Hang",
++		[RESET_TYPE_BB_WATCHDOG] = "Baseband Watchdog",
++		[RESET_TYPE_FATAL_INT] = "Fatal HW Error",
++		[RESET_TYPE_TX_ERROR] = "TX HW error",
++		[RESET_TYPE_TX_GTT] = "Transmit timeout",
++		[RESET_TYPE_TX_HANG] = "TX Path Hang",
++		[RESET_TYPE_PLL_HANG] = "PLL RX Hang",
++		[RESET_TYPE_MAC_HANG] = "MAC Hang",
++		[RESET_TYPE_BEACON_STUCK] = "Stuck Beacon",
++		[RESET_TYPE_MCI] = "MCI Reset",
++	};
+ 	char buf[512];
+ 	unsigned int len = 0;
++	int i;
+ 
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "Baseband Hang",
+-			 sc->debug.stats.reset[RESET_TYPE_BB_HANG]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "Baseband Watchdog",
+-			 sc->debug.stats.reset[RESET_TYPE_BB_WATCHDOG]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "Fatal HW Error",
+-			 sc->debug.stats.reset[RESET_TYPE_FATAL_INT]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "TX HW error",
+-			 sc->debug.stats.reset[RESET_TYPE_TX_ERROR]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "TX Path Hang",
+-			 sc->debug.stats.reset[RESET_TYPE_TX_HANG]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "PLL RX Hang",
+-			 sc->debug.stats.reset[RESET_TYPE_PLL_HANG]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "MAC Hang",
+-			 sc->debug.stats.reset[RESET_TYPE_MAC_HANG]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "Stuck Beacon",
+-			 sc->debug.stats.reset[RESET_TYPE_BEACON_STUCK]);
+-	len += scnprintf(buf + len, sizeof(buf) - len,
+-			 "%17s: %2d\n", "MCI Reset",
+-			 sc->debug.stats.reset[RESET_TYPE_MCI]);
++	for (i = 0; i < ARRAY_SIZE(reset_cause); i++) {
++		if (!reset_cause[i])
++		    continue;
++
++		len += scnprintf(buf + len, sizeof(buf) - len,
++				 "%17s: %2d\n", reset_cause[i],
++				 sc->debug.stats.reset[i]);
++	}
+ 
+ 	if (len > sizeof(buf))
+ 		len = sizeof(buf);
diff --git a/package/kernel/mac80211/patches/565-ath9k_restart_after_nfcal_failure.patch b/package/kernel/mac80211/patches/565-ath9k_restart_after_nfcal_failure.patch
new file mode 100644
index 0000000000..366cc3c7f5
--- /dev/null
+++ b/package/kernel/mac80211/patches/565-ath9k_restart_after_nfcal_failure.patch
@@ -0,0 +1,172 @@
+--- a/drivers/net/wireless/ath/ath9k/calib.c
++++ b/drivers/net/wireless/ath/ath9k/calib.c
+@@ -234,7 +234,7 @@ void ath9k_hw_start_nfcal(struct ath_hw 
+ 	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
+ }
+ 
+-void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
++int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
+ {
+ 	struct ath9k_nfcal_hist *h = NULL;
+ 	unsigned i, j;
+@@ -301,7 +301,7 @@ void ath9k_hw_loadnf(struct ath_hw *ah, 
+ 		ath_dbg(common, ANY,
+ 			"Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
+ 			REG_READ(ah, AR_PHY_AGC_CONTROL));
+-		return;
++		return -ETIMEDOUT;
+ 	}
+ 
+ 	/*
+@@ -322,6 +322,8 @@ void ath9k_hw_loadnf(struct ath_hw *ah, 
+ 		}
+ 	}
+ 	REGWRITE_BUFFER_FLUSH(ah);
++
++	return 0;
+ }
+ 
+ 
+--- a/drivers/net/wireless/ath/ath9k/calib.h
++++ b/drivers/net/wireless/ath/ath9k/calib.h
+@@ -109,7 +109,7 @@ struct ath9k_pacal_info{
+ 
+ bool ath9k_hw_reset_calvalid(struct ath_hw *ah);
+ void ath9k_hw_start_nfcal(struct ath_hw *ah, bool update);
+-void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan);
++int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan);
+ bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan);
+ void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah,
+ 				  struct ath9k_channel *chan);
+--- a/drivers/net/wireless/ath/ath9k/ar9002_calib.c
++++ b/drivers/net/wireless/ath/ath9k/ar9002_calib.c
+@@ -657,14 +657,13 @@ static void ar9002_hw_olc_temp_compensat
+ 		ar9280_hw_olc_temp_compensation(ah);
+ }
+ 
+-static bool ar9002_hw_calibrate(struct ath_hw *ah,
+-				struct ath9k_channel *chan,
+-				u8 rxchainmask,
+-				bool longcal)
++static int ar9002_hw_calibrate(struct ath_hw *ah, struct ath9k_channel *chan,
++			       u8 rxchainmask, bool longcal)
+ {
+ 	bool iscaldone = true;
+ 	struct ath9k_cal_list *currCal = ah->cal_list_curr;
+ 	bool nfcal, nfcal_pending = false;
++	int ret;
+ 
+ 	nfcal = !!(REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF);
+ 	if (ah->caldata)
+@@ -698,7 +697,9 @@ static bool ar9002_hw_calibrate(struct a
+ 			 * NF is slow time-variant, so it is OK to use a
+ 			 * historical value.
+ 			 */
+-			ath9k_hw_loadnf(ah, ah->curchan);
++			ret = ath9k_hw_loadnf(ah, ah->curchan);
++			if (ret < 0)
++				return ret;
+ 		}
+ 
+ 		if (longcal) {
+--- a/drivers/net/wireless/ath/ath9k/hw-ops.h
++++ b/drivers/net/wireless/ath/ath9k/hw-ops.h
+@@ -41,10 +41,9 @@ static inline void ath9k_hw_set_desc_lin
+ 	ath9k_hw_ops(ah)->set_desc_link(ds, link);
+ }
+ 
+-static inline bool ath9k_hw_calibrate(struct ath_hw *ah,
+-				      struct ath9k_channel *chan,
+-				      u8 rxchainmask,
+-				      bool longcal)
++static inline int ath9k_hw_calibrate(struct ath_hw *ah,
++				     struct ath9k_channel *chan,
++				     u8 rxchainmask, bool longcal)
+ {
+ 	return ath9k_hw_ops(ah)->calibrate(ah, chan, rxchainmask, longcal);
+ }
+--- a/drivers/net/wireless/ath/ath9k/ar9003_calib.c
++++ b/drivers/net/wireless/ath/ath9k/ar9003_calib.c
+@@ -121,13 +121,12 @@ static bool ar9003_hw_per_calibration(st
+ 	return iscaldone;
+ }
+ 
+-static bool ar9003_hw_calibrate(struct ath_hw *ah,
+-				struct ath9k_channel *chan,
+-				u8 rxchainmask,
+-				bool longcal)
++static int ar9003_hw_calibrate(struct ath_hw *ah, struct ath9k_channel *chan,
++			       u8 rxchainmask, bool longcal)
+ {
+ 	bool iscaldone = true;
+ 	struct ath9k_cal_list *currCal = ah->cal_list_curr;
++	int ret;
+ 
+ 	/*
+ 	 * For given calibration:
+@@ -163,7 +162,9 @@ static bool ar9003_hw_calibrate(struct a
+ 		 * NF is slow time-variant, so it is OK to use a historical
+ 		 * value.
+ 		 */
+-		ath9k_hw_loadnf(ah, ah->curchan);
++		ret = ath9k_hw_loadnf(ah, ah->curchan);
++		if (ret < 0)
++			return ret;
+ 
+ 		/* start NF calibration, without updating BB NF register */
+ 		ath9k_hw_start_nfcal(ah, false);
+--- a/drivers/net/wireless/ath/ath9k/hw.h
++++ b/drivers/net/wireless/ath/ath9k/hw.h
+@@ -695,10 +695,8 @@ struct ath_hw_ops {
+ 				     bool power_off);
+ 	void (*rx_enable)(struct ath_hw *ah);
+ 	void (*set_desc_link)(void *ds, u32 link);
+-	bool (*calibrate)(struct ath_hw *ah,
+-			  struct ath9k_channel *chan,
+-			  u8 rxchainmask,
+-			  bool longcal);
++	int (*calibrate)(struct ath_hw *ah, struct ath9k_channel *chan,
++			 u8 rxchainmask, bool longcal);
+ 	bool (*get_isr)(struct ath_hw *ah, enum ath9k_int *masked,
+ 			u32 *sync_cause_p);
+ 	void (*set_txdesc)(struct ath_hw *ah, void *ds,
+--- a/drivers/net/wireless/ath/ath9k/debug.h
++++ b/drivers/net/wireless/ath/ath9k/debug.h
+@@ -49,6 +49,7 @@ enum ath_reset_type {
+ 	RESET_TYPE_MAC_HANG,
+ 	RESET_TYPE_BEACON_STUCK,
+ 	RESET_TYPE_MCI,
++	RESET_TYPE_CALIBRATION,
+ 	__RESET_TYPE_MAX
+ };
+ 
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -857,6 +857,7 @@ static ssize_t read_file_reset(struct fi
+ 		[RESET_TYPE_MAC_HANG] = "MAC Hang",
+ 		[RESET_TYPE_BEACON_STUCK] = "Stuck Beacon",
+ 		[RESET_TYPE_MCI] = "MCI Reset",
++		[RESET_TYPE_CALIBRATION] = "Calibration error",
+ 	};
+ 	char buf[512];
+ 	unsigned int len = 0;
+--- a/drivers/net/wireless/ath/ath9k/link.c
++++ b/drivers/net/wireless/ath/ath9k/link.c
+@@ -376,9 +376,14 @@ void ath_ani_calibrate(unsigned long dat
+ 
+ 	/* Perform calibration if necessary */
+ 	if (longcal || shortcal) {
+-		common->ani.caldone =
+-			ath9k_hw_calibrate(ah, ah->curchan,
+-					   ah->rxchainmask, longcal);
++		int ret = ath9k_hw_calibrate(ah, ah->curchan, ah->rxchainmask,
++					     longcal);
++		if (ret < 0) {
++			ath9k_queue_reset(sc, RESET_TYPE_CALIBRATION);
++			return;
++		}
++
++		common->ani.caldone = ret;
+ 	}
+ 
+ 	ath_dbg(common, ANI,