ath9k: Do an AHB reset before doing RTC reset

PATCH New Vasanthakumar Thiagarajan 1 participant 1 message Aug 31, 2009 Qualcomm Atheros ATH9K wireless driver

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Vasanthakumar Thiagarajan

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2009-08-31 12:18 UTC #0 lore raw

PATCH 1/1 ath9k: Do an AHB reset before doing RTC reset

Doing an RTC reset when DMA is active may corrupt memory, make sure no DMA is active at this moment by doing an AHB reset.

Signed-off-by Vasanthakumar Thiagarajan <[email protected]>

---
 drivers/net/wireless/ath/ath9k/hw.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

drivers/net/wireless/ath/ath9k/hw.c +7 -0

index e340dac..71f27f3 100644
@@ -1712,8 +1712,15 @@ static bool ath9k_hw_set_reset_power_on(struct ath_hw *ah)
 	REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN |
 		  AR_RTC_FORCE_WAKE_ON_INT);
 
+	if (!AR_SREV_9100(ah))
+		REG_WRITE(ah, AR_RC, AR_RC_AHB);
+
 	REG_WRITE(ah, AR_RTC_RESET, 0);
 	udelay(2);
+
+	if (!AR_SREV_9100(ah))
+		REG_WRITE(ah, AR_RC, 0);
+
 	REG_WRITE(ah, AR_RTC_RESET, 1);
 
 	if (!ath9k_hw_wait(ah,

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