8384c0dba0
When wifi radio is reset, some bits in (undocumented) USB registers may
flip. Patch adds setting them after radio reset (channel change, up/down).
With this patch stability of USB1.1 full-speed devices, connected directly
to AR9331 host port (no USB2.0 hub) is improved.
See "ar9331's usb stability issue" OpenWrt forum thread for details:
<https://forum.openwrt.org/viewtopic.php?id=39956>
Based on QCA's Open HAL WAR_USB_DISABLE_PLL_LOCK_DETECT() macro:
<https://github.com/qca/qcamain_open_hal_public/blob/master/hal/ar9300/ar9300_reset.c#L74>
Adapted to Linux mac80211 driver for 8Devices Carambola2 board by Mantas Pucka:
<b08b59ceb4>
Ported to latest OpenWrt BB branch and tested on TP-Link TL-WR703N by
Michel Stempin <michel.stempin@wanadoo.fr>.
Signed-off-by: Michel Stempin <michel.stempin@wanadoo.fr>
[juhosg: refresh and clean up the ath9k patch]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 39212
80 lines
2.1 KiB
Diff
80 lines
2.1 KiB
Diff
--- a/drivers/net/wireless/ath/ath9k/hw.c
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+++ b/drivers/net/wireless/ath/ath9k/hw.c
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@@ -269,6 +269,19 @@ void ath9k_hw_get_channel_centers(struct
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centers->synth_center + (extoff * HT40_CHANNEL_CENTER_SHIFT);
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}
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+static inline void ath9k_hw_disable_pll_lock_detect(struct ath_hw *ah)
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+{
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+ /* On AR9330 and AR9340 devices, some PHY registers must be
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+ * tuned to gain better stability/performance. These registers
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+ * might be changed while doing wlan reset so the registers must
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+ * be reprogrammed after each reset.
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+ */
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+ REG_CLR_BIT(ah, AR_PHY_USB_CTRL1, BIT(20));
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+ REG_RMW(ah, AR_PHY_USB_CTRL2,
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+ (1 << 21) | (0xf << 22),
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+ (1 << 21) | (0x3 << 22));
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+}
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+
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/******************/
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/* Chip Revisions */
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/******************/
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@@ -1357,6 +1370,9 @@ static bool ath9k_hw_set_reset(struct at
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if (AR_SREV_9100(ah))
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udelay(50);
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+ if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
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+ ath9k_hw_disable_pll_lock_detect(ah);
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+
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return true;
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}
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@@ -1457,6 +1473,9 @@ static bool ath9k_hw_chip_reset(struct a
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ath9k_hw_init_pll(ah, chan);
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ath9k_hw_set_rfmode(ah, chan);
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+ if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
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+ ath9k_hw_disable_pll_lock_detect(ah);
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+
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return true;
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}
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@@ -1817,8 +1836,14 @@ static int ath9k_hw_do_fastcc(struct ath
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if (AR_SREV_9271(ah))
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ar9002_hw_load_ani_reg(ah, chan);
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+ if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
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+ ath9k_hw_disable_pll_lock_detect(ah);
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+
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return 0;
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fail:
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+ if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
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+ ath9k_hw_disable_pll_lock_detect(ah);
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+
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return -EINVAL;
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}
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@@ -2043,6 +2068,9 @@ int ath9k_hw_reset(struct ath_hw *ah, st
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if (AR_SREV_9565(ah) && common->bt_ant_diversity)
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REG_SET_BIT(ah, AR_BTCOEX_WL_LNADIV, AR_BTCOEX_WL_LNADIV_FORCE_ON);
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+ if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
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+ ath9k_hw_disable_pll_lock_detect(ah);
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+
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return 0;
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}
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EXPORT_SYMBOL(ath9k_hw_reset);
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--- a/drivers/net/wireless/ath/ath9k/phy.h
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+++ b/drivers/net/wireless/ath/ath9k/phy.h
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@@ -48,6 +48,9 @@
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#define AR_PHY_PLL_CONTROL 0x16180
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#define AR_PHY_PLL_MODE 0x16184
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+#define AR_PHY_USB_CTRL1 0x16c84
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+#define AR_PHY_USB_CTRL2 0x16c88
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+
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enum ath9k_ant_div_comb_lna_conf {
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ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2,
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ATH_ANT_DIV_COMB_LNA2,
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