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staging: vt6656: CARDqGetNextTBTT replace code using do_div.

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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: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2014-01-01 19:20:40 +00:00 committed by Greg Kroah-Hartman
parent 9acec059c0
commit 6e28024e16
1 changed files with 11 additions and 19 deletions
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30
drivers/staging/vt6656/card.c
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@ -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;
/* Next TBTT =
* ((local_current_TSF / beacon_interval) + 1) * beacon_interval
*/
if (uBeaconInterval) {
do_div(qwTSF, uBeaconInterval);
qwTSF += 1;
qwTSF *= uBeaconInterval;
}
// check if carry when add one beacon interval
if ((~uLowNextTBTT) < uLowRemain)
qwTSF = ((qwTSF >> 32) + 1) << 32;
qwTSF = (qwTSF & 0xffffffff00000000ULL) |
(u64)(uLowNextTBTT + uLowRemain);
return (qwTSF);
return qwTSF;
}
/*