ath9k: fix pll clock initialization on newer soc devices (fixes #14916)

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

SVN-Revision: 42453

1 files changed, 125 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/300-pending_work.patch b/package/kernel/mac80211/patches/300-pending_work.patch
index 6d1bc80..fc1ff10 100644
--- a/package/kernel/mac80211/patches/300-pending_work.patch
+++ b/package/kernel/mac80211/patches/300-pending_work.patch
@@ -1,3 +1,23 @@
+commit 11f17631d9bf2a9e910dac7d09ba4581f5693831
+Author: Felix Fietkau <nbd@openwrt.org>
+Date:   Tue Sep 9 09:48:30 2014 +0200
+
+    ath9k_hw: fix PLL clock initialization for newer SoC
+    
+    On AR934x and newer SoC devices, the layout of the AR_RTC_PLL_CONTROL
+    register changed. This currently breaks at least 5/10 MHz operation.
+    AR933x uses the old layout.
+    
+    It might also have been causing other stability issues because of the
+    different location of the PLL_BYPASS bit which needs to be set during
+    PLL clock initialization.
+    
+    This patch also removes more instances of hardcoded register values in
+    favor of properly computed ones with the PLL_BYPASS bit added.
+    
+    Reported-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
+    Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
 commit 0fecedddd4a0945873db1bd230ec6a168b3cc4fe
 Author: Felix Fietkau <nbd@openwrt.org>
 Date:   Mon Sep 8 18:35:08 2014 +0200
@@ -3166,3 +3186,108 @@ Date:   Mon May 19 21:20:49 2014 +0200
  
  		if (level != aniState->spurImmunityLevel) {
  			ath_dbg(common, ANI,
+--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
++++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+@@ -517,6 +517,23 @@ static void ar9003_hw_spur_mitigate(stru
+ 	ar9003_hw_spur_mitigate_ofdm(ah, chan);
+ }
+ 
++static u32 ar9003_hw_compute_pll_control_soc(struct ath_hw *ah,
++					     struct ath9k_channel *chan)
++{
++	u32 pll;
++
++	pll = SM(0x5, AR_RTC_9300_SOC_PLL_REFDIV);
++
++	if (chan && IS_CHAN_HALF_RATE(chan))
++		pll |= SM(0x1, AR_RTC_9300_SOC_PLL_CLKSEL);
++	else if (chan && IS_CHAN_QUARTER_RATE(chan))
++		pll |= SM(0x2, AR_RTC_9300_SOC_PLL_CLKSEL);
++
++	pll |= SM(0x2c, AR_RTC_9300_SOC_PLL_DIV_INT);
++
++	return pll;
++}
++
+ static u32 ar9003_hw_compute_pll_control(struct ath_hw *ah,
+ 					 struct ath9k_channel *chan)
+ {
+@@ -1779,7 +1796,12 @@ void ar9003_hw_attach_phy_ops(struct ath
+ 
+ 	priv_ops->rf_set_freq = ar9003_hw_set_channel;
+ 	priv_ops->spur_mitigate_freq = ar9003_hw_spur_mitigate;
+-	priv_ops->compute_pll_control = ar9003_hw_compute_pll_control;
++
++	if (AR_SREV_9340(ah) || AR_SREV_9550(ah) || AR_SREV_9531(ah))
++		priv_ops->compute_pll_control = ar9003_hw_compute_pll_control_soc;
++	else
++		priv_ops->compute_pll_control = ar9003_hw_compute_pll_control;
++
+ 	priv_ops->set_channel_regs = ar9003_hw_set_channel_regs;
+ 	priv_ops->init_bb = ar9003_hw_init_bb;
+ 	priv_ops->process_ini = ar9003_hw_process_ini;
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -702,6 +702,8 @@ static void ath9k_hw_init_pll(struct ath
+ {
+ 	u32 pll;
+ 
++	pll = ath9k_hw_compute_pll_control(ah, chan);
++
+ 	if (AR_SREV_9485(ah) || AR_SREV_9565(ah)) {
+ 		/* program BB PLL ki and kd value, ki=0x4, kd=0x40 */
+ 		REG_RMW_FIELD(ah, AR_CH0_BB_DPLL2,
+@@ -752,7 +754,8 @@ static void ath9k_hw_init_pll(struct ath
+ 		REG_RMW_FIELD(ah, AR_CH0_DDR_DPLL3,
+ 			      AR_CH0_DPLL3_PHASE_SHIFT, 0x1);
+ 
+-		REG_WRITE(ah, AR_RTC_PLL_CONTROL, 0x1142c);
++		REG_WRITE(ah, AR_RTC_PLL_CONTROL,
++			  pll | AR_RTC_9300_PLL_BYPASS);
+ 		udelay(1000);
+ 
+ 		/* program refdiv, nint, frac to RTC register */
+@@ -768,7 +771,8 @@ static void ath9k_hw_init_pll(struct ath
+ 	} else if (AR_SREV_9340(ah) || AR_SREV_9550(ah) || AR_SREV_9531(ah)) {
+ 		u32 regval, pll2_divint, pll2_divfrac, refdiv;
+ 
+-		REG_WRITE(ah, AR_RTC_PLL_CONTROL, 0x1142c);
++		REG_WRITE(ah, AR_RTC_PLL_CONTROL,
++			  pll | AR_RTC_9300_SOC_PLL_BYPASS);
+ 		udelay(1000);
+ 
+ 		REG_SET_BIT(ah, AR_PHY_PLL_MODE, 0x1 << 16);
+@@ -840,7 +844,6 @@ static void ath9k_hw_init_pll(struct ath
+ 		udelay(1000);
+ 	}
+ 
+-	pll = ath9k_hw_compute_pll_control(ah, chan);
+ 	if (AR_SREV_9565(ah))
+ 		pll |= 0x40000;
+ 	REG_WRITE(ah, AR_RTC_PLL_CONTROL, pll);
+--- a/drivers/net/wireless/ath/ath9k/reg.h
++++ b/drivers/net/wireless/ath/ath9k/reg.h
+@@ -1236,12 +1236,23 @@ enum {
+ #define AR_CH0_DPLL3_PHASE_SHIFT_S   23
+ #define AR_PHY_CCA_NOM_VAL_2GHZ      -118
+ 
++#define AR_RTC_9300_SOC_PLL_DIV_INT          0x0000003f
++#define AR_RTC_9300_SOC_PLL_DIV_INT_S        0
++#define AR_RTC_9300_SOC_PLL_DIV_FRAC         0x000fffc0
++#define AR_RTC_9300_SOC_PLL_DIV_FRAC_S       6
++#define AR_RTC_9300_SOC_PLL_REFDIV           0x01f00000
++#define AR_RTC_9300_SOC_PLL_REFDIV_S         20
++#define AR_RTC_9300_SOC_PLL_CLKSEL           0x06000000
++#define AR_RTC_9300_SOC_PLL_CLKSEL_S         25
++#define AR_RTC_9300_SOC_PLL_BYPASS           0x08000000
++
+ #define AR_RTC_9300_PLL_DIV          0x000003ff
+ #define AR_RTC_9300_PLL_DIV_S        0
+ #define AR_RTC_9300_PLL_REFDIV       0x00003C00
+ #define AR_RTC_9300_PLL_REFDIV_S     10
+ #define AR_RTC_9300_PLL_CLKSEL       0x0000C000
+ #define AR_RTC_9300_PLL_CLKSEL_S     14
++#define AR_RTC_9300_PLL_BYPASS       0x00010000
+ 
+ #define AR_RTC_9160_PLL_DIV	0x000003ff
+ #define AR_RTC_9160_PLL_DIV_S   0