30 lines
898 B
Diff
30 lines
898 B
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 25 Jan 2017 12:58:17 +0100
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Subject: [PATCH] ath9k_hw: check if the chip failed to wake up
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In an RFC patch, Sven Eckelmann and Simon Wunderlich reported:
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"QCA 802.11n chips (especially AR9330/AR9340) sometimes end up in a
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state in which a read of AR_CFG always returns 0xdeadbeef.
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This should not happen when when the power_mode of the device is
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ATH9K_PM_AWAKE."
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Include the check for the default register state in the existing MAC
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hang check.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/wireless/ath/ath9k/hw.c
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+++ b/drivers/net/wireless/ath/ath9k/hw.c
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@@ -1624,6 +1624,10 @@ bool ath9k_hw_check_alive(struct ath_hw
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int count = 50;
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u32 reg, last_val;
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+ /* Check if chip failed to wake up */
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+ if (REG_READ(ah, AR_CFG) == 0xdeadbeef)
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+ return false;
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+
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if (AR_SREV_9300(ah))
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return !ath9k_hw_detect_mac_hang(ah);
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