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| author | Min Li <min.li.xe@renesas.com> | 2020-11-06 04:52:09 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-07 22:10:31 +0100 |
| commit | 6c196f36f5243b8814f471cba608b111a33f22df (patch) | |
| tree | e5e205dc731949b7f9f13cf41e06ad4859e11d04 /drivers/ptp | |
| parent | ptp: idt82p33: use i2c_master_send for bus write (diff) | |
| download | linux-6c196f36f5243b8814f471cba608b111a33f22df.tar.xz linux-6c196f36f5243b8814f471cba608b111a33f22df.zip | |
ptp: idt82p33: optimize _idt82p33_adjfine
Use div_s64 so that the neg_adj is not needed.
Signed-off-by: Min Li <min.li.xe@renesas.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://lore.kernel.org/r/1604634729-24960-3-git-send-email-min.li.xe@renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/ptp')
| -rw-r--r-- | drivers/ptp/ptp_idt82p33.c | 10 |
1 files changed, 1 insertions, 9 deletions
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; |