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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: Malcolm Priestley <tvboxspy@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 11 additions and 19 deletions
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@ -720,28 +720,20 @@ bool CARDbClearCurrentTSF(struct vnt_private *pDevice)
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*/
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u64 CARDqGetNextTBTT(u64 qwTSF, u16 wBeaconInterval)
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{
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unsigned int uLowNextTBTT;
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unsigned int uHighRemain, uLowRemain;
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unsigned int uBeaconInterval;
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u32 uBeaconInterval;
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uBeaconInterval = wBeaconInterval * 1024;
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// Next TBTT = ((local_current_TSF / beacon_interval) + 1 ) * beacon_interval
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uLowNextTBTT = ((qwTSF & 0xffffffffULL) >> 10) << 10;
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uLowRemain = (uLowNextTBTT) % uBeaconInterval;
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uHighRemain = ((0x80000000 % uBeaconInterval) * 2 * (u32)(qwTSF >> 32))
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% uBeaconInterval;
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uLowRemain = (uHighRemain + uLowRemain) % uBeaconInterval;
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uLowRemain = uBeaconInterval - uLowRemain;
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// check if carry when add one beacon interval
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if ((~uLowNextTBTT) < uLowRemain)
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qwTSF = ((qwTSF >> 32) + 1) << 32;
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/* Next TBTT =
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* ((local_current_TSF / beacon_interval) + 1) * beacon_interval
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*/
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if (uBeaconInterval) {
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do_div(qwTSF, uBeaconInterval);
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qwTSF += 1;
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qwTSF *= uBeaconInterval;
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}
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qwTSF = (qwTSF & 0xffffffff00000000ULL) |
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(u64)(uLowNextTBTT + uLowRemain);
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return (qwTSF);
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return qwTSF;
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}
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/*
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