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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) u64 CARDqGetNextTBTT(u64 qwTSF, u16 wBeaconInterval)
{ {
u32 uBeaconInterval;
unsigned int uLowNextTBTT; uBeaconInterval = wBeaconInterval * 1024;
unsigned int uHighRemain, uLowRemain;
unsigned int uBeaconInterval;
uBeaconInterval = wBeaconInterval * 1024; /* Next TBTT =
// Next TBTT = ((local_current_TSF / beacon_interval) + 1 ) * beacon_interval * ((local_current_TSF / beacon_interval) + 1) * beacon_interval
uLowNextTBTT = ((qwTSF & 0xffffffffULL) >> 10) << 10; */
uLowRemain = (uLowNextTBTT) % uBeaconInterval; if (uBeaconInterval) {
uHighRemain = ((0x80000000 % uBeaconInterval) * 2 * (u32)(qwTSF >> 32)) do_div(qwTSF, uBeaconInterval);
% uBeaconInterval; qwTSF += 1;
uLowRemain = (uHighRemain + uLowRemain) % uBeaconInterval; qwTSF *= uBeaconInterval;
uLowRemain = uBeaconInterval - uLowRemain; }
// check if carry when add one beacon interval return qwTSF;
if ((~uLowNextTBTT) < uLowRemain)
qwTSF = ((qwTSF >> 32) + 1) << 32;
qwTSF = (qwTSF & 0xffffffff00000000ULL) |
(u64)(uLowNextTBTT + uLowRemain);
return (qwTSF);
} }
/* /*