From 6c196f36f5243b8814f471cba608b111a33f22df Mon Sep 17 00:00:00 2001 From: Min Li Date: Thu, 5 Nov 2020 22:52:09 -0500 Subject: ptp: idt82p33: optimize _idt82p33_adjfine Use div_s64 so that the neg_adj is not needed. Signed-off-by: Min Li Acked-by: Richard Cochran Link: https://lore.kernel.org/r/1604634729-24960-3-git-send-email-min.li.xe@renesas.com Signed-off-by: Jakub Kicinski --- drivers/ptp/ptp_idt82p33.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) (limited to 'drivers/ptp') diff --git a/drivers/ptp/ptp_idt82p33.c b/drivers/ptp/ptp_idt82p33.c index 223bc11cb8fe..c1c959f7e52b 100644 --- a/drivers/ptp/ptp_idt82p33.c +++ b/drivers/ptp/ptp_idt82p33.c @@ -320,7 +320,6 @@ static int _idt82p33_adjfine(struct idt82p33_channel *channel, long scaled_ppm) { struct idt82p33 *idt82p33 = channel->idt82p33; unsigned char buf[5] = {0}; - int neg_adj = 0; int err, i; s64 fcw; @@ -340,16 +339,9 @@ static int _idt82p33_adjfine(struct idt82p33_channel *channel, long scaled_ppm) * FCW = ------------- * 168 * 2^4 */ - if (scaled_ppm < 0) { - neg_adj = 1; - scaled_ppm = -scaled_ppm; - } fcw = scaled_ppm * 244140625ULL; - fcw = div_u64(fcw, 2688); - - if (neg_adj) - fcw = -fcw; + fcw = div_s64(fcw, 2688); for (i = 0; i < 5; i++) { buf[i] = fcw & 0xff; -- cgit v1.2.3-58-ga151