diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/gianfar_ptp.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/gianfar_ptp.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/net/ethernet/freescale/gianfar_ptp.c b/drivers/net/ethernet/freescale/gianfar_ptp.c index 3e8d1fffe34e..721be13081f9 100644 --- a/drivers/net/ethernet/freescale/gianfar_ptp.c +++ b/drivers/net/ethernet/freescale/gianfar_ptp.c @@ -280,21 +280,26 @@ static irqreturn_t isr(int irq, void *priv) * PTP clock operations */ -static int ptp_gianfar_adjfreq(struct ptp_clock_info *ptp, s32 ppb) +static int ptp_gianfar_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) { - u64 adj; - u32 diff, tmr_add; + u64 adj, diff; + u32 tmr_add; int neg_adj = 0; struct etsects *etsects = container_of(ptp, struct etsects, caps); - if (ppb < 0) { + if (scaled_ppm < 0) { neg_adj = 1; - ppb = -ppb; + scaled_ppm = -scaled_ppm; } tmr_add = etsects->tmr_add; adj = tmr_add; - adj *= ppb; - diff = div_u64(adj, 1000000000ULL); + + /* calculate diff as adj*(scaled_ppm/65536)/1000000 + * and round() to the nearest integer + */ + adj *= scaled_ppm; + diff = div_u64(adj, 8000000); + diff = (diff >> 13) + ((diff >> 12) & 1); tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff; @@ -415,7 +420,7 @@ static struct ptp_clock_info ptp_gianfar_caps = { .n_per_out = 0, .n_pins = 0, .pps = 1, - .adjfreq = ptp_gianfar_adjfreq, + .adjfine = ptp_gianfar_adjfine, .adjtime = ptp_gianfar_adjtime, .gettime64 = ptp_gianfar_gettime, .settime64 = ptp_gianfar_settime, |