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ath9k: Do an AHB reset before doing RTC reset

Message ID 1251721116-25758-1-git-send-email-vasanth@atheros.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Vasanthakumar Thiagarajan Aug. 31, 2009, 12:18 p.m. UTC
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 <vasanth@atheros.com>
---
 drivers/net/wireless/ath/ath9k/hw.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index e340dac..71f27f3 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -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,