ptp: switch to using FIELD_GET_SIGNED()

Switch from sign_extend32(FIELD_GET()) to the dedicated
FIELD_GET_SIGNED() and don't calculate the fields length explicitly.

Signed-off-by: Yury Norov <ynorov@nvidia.com>

diff --git a/drivers/ptp/ptp_fc3.c b/drivers/ptp/ptp_fc3.c
index 70002500170eae445244cc82ec3979c3ac07d634..f0e000428a3f4c26ddd9c93cd229f72fc47be2b0 100644 (file)
--- a/drivers/ptp/ptp_fc3.c
+++ b/drivers/ptp/ptp_fc3.c
@@ -55,8 +55,8 @@ static s64 tdc_meas2offset(struct idtfc3 *idtfc3, u64 meas_read)
 {
        s64 coarse, fine;
 
-       fine = sign_extend64(FIELD_GET(FINE_MEAS_MASK, meas_read), 12);
-       coarse = sign_extend64(FIELD_GET(COARSE_MEAS_MASK, meas_read), (39 - 13));
+       fine = FIELD_GET_SIGNED(FINE_MEAS_MASK, meas_read);
+       coarse = FIELD_GET_SIGNED(COARSE_MEAS_MASK, meas_read);
 
        fine = div64_s64(fine * NSEC_PER_SEC, idtfc3->tdc_apll_freq * 62LL);
        coarse = div64_s64(coarse * NSEC_PER_SEC, idtfc3->time_ref_freq);