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ptp: idt82p33: optimize _idt82p33_adjfine
author
Min Li
<min.li.xe@renesas.com>
Fri, 6 Nov 2020 03:52:09 +0000
(22:52 -0500)
committer
Jakub Kicinski
<kuba@kernel.org>
Sat, 7 Nov 2020 21:10:31 +0000
(13:10 -0800)
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>
drivers/ptp/ptp_idt82p33.c
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diff --git
a/drivers/ptp/ptp_idt82p33.c
b/drivers/ptp/ptp_idt82p33.c
index
223bc11
..
c1c959f
100644
(file)
--- 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;