From: Vasanthakumar Thiagarajan <vasanth@atheros.com>
To: <linville@tuxdriver.com>
Cc: <linux-wireless@vger.kernel.org>, <Luis.Rodriguez@atheros.com>,
<Jouni.Malinen@atheros.com>, <ath9k-devel@lists.ath9k.org>
Subject: [PATCH] ath9k: Do an AHB reset before doing RTC reset
Date: Mon, 31 Aug 2009 17:48:36 +0530 [thread overview]
Message-ID: <1251721116-25758-1-git-send-email-vasanth@atheros.com> (raw)
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(-)
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,
--
1.5.5.1
reply other threads:[~2009-08-31 12:26 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1251721116-25758-1-git-send-email-vasanth@atheros.com \
--to=vasanth@atheros.com \
--cc=Jouni.Malinen@atheros.com \
--cc=Luis.Rodriguez@atheros.com \
--cc=ath9k-devel@lists.ath9k.org \
--cc=linux-wireless@vger.kernel.org \
--cc=linville@tuxdriver.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox