[PATCH 9/9] ptp: switch to using FIELD_GET_SIGNED()

[Yury Norov]

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@xxxxxxxxxx>
---
 drivers/ptp/ptp_fc3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ptp/ptp_fc3.c b/drivers/ptp/ptp_fc3.c
index 70002500170e..f0e000428a3f 100644
--- 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);
-- 
2.51.0