From: Christian Lamparter <chunkeey@googlemail.com>
To: linux-wireless@vger.kernel.org
Cc: linville@tuxdriver.com
Subject: [PATCH] p54: improve TSF timestamp precision
Date: Sat, 24 Nov 2012 14:23:25 +0100 [thread overview]
Message-ID: <E1TcFpW-00056n-QB@debian64.localnet> (raw)
The LMAC API states that the TSF clock value of
every rx'ed frame is a "usec accurate timestamp
of the hardware clock at the end of frame
(before OFDM SIFS EOF padding)".
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
---
drivers/net/wireless/p54/txrx.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c
index 8ae982b..12f0a34 100644
--- a/drivers/net/wireless/p54/txrx.c
+++ b/drivers/net/wireless/p54/txrx.c
@@ -369,7 +369,11 @@ static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
priv->tsf_low32 = tsf32;
- rx_status->flag |= RX_FLAG_MACTIME_START;
+ /* LMAC API Page 10/29 - s_lm_data_in - clock
+ * "usec accurate timestamp of hardware clock
+ * at end of frame (before OFDM SIFS EOF padding"
+ */
+ rx_status->flag |= RX_FLAG_MACTIME_END;
if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
header_len += hdr->align[0];
--
1.7.10.4
reply other threads:[~2012-11-24 13:31 UTC|newest]
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