Commit 6e28024e authored by Malcolm Priestley's avatar Malcolm Priestley Committed by Greg Kroah-Hartman

staging: vt6656: CARDqGetNextTBTT replace code using do_div.

uBeaconInterval becomes u32

get next TBTT value using vendor's equation as shown.

This patch was checked against the original code
and yields exactly the same value.
Signed-off-by: default avatarMalcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9acec059
......@@ -720,28 +720,20 @@ bool CARDbClearCurrentTSF(struct vnt_private *pDevice)
*/
u64 CARDqGetNextTBTT(u64 qwTSF, u16 wBeaconInterval)
{
u32 uBeaconInterval;
unsigned int uLowNextTBTT;
unsigned int uHighRemain, uLowRemain;
unsigned int uBeaconInterval;
uBeaconInterval = wBeaconInterval * 1024;
uBeaconInterval = wBeaconInterval * 1024;
// Next TBTT = ((local_current_TSF / beacon_interval) + 1 ) * beacon_interval
uLowNextTBTT = ((qwTSF & 0xffffffffULL) >> 10) << 10;
uLowRemain = (uLowNextTBTT) % uBeaconInterval;
uHighRemain = ((0x80000000 % uBeaconInterval) * 2 * (u32)(qwTSF >> 32))
% uBeaconInterval;
uLowRemain = (uHighRemain + uLowRemain) % uBeaconInterval;
uLowRemain = uBeaconInterval - uLowRemain;
// check if carry when add one beacon interval
if ((~uLowNextTBTT) < uLowRemain)
qwTSF = ((qwTSF >> 32) + 1) << 32;
qwTSF = (qwTSF & 0xffffffff00000000ULL) |
(u64)(uLowNextTBTT + uLowRemain);
/* Next TBTT =
* ((local_current_TSF / beacon_interval) + 1) * beacon_interval
*/
if (uBeaconInterval) {
do_div(qwTSF, uBeaconInterval);
qwTSF += 1;
qwTSF *= uBeaconInterval;
}
return (qwTSF);
return qwTSF;
}
/*
......
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