[PATCH net-next] net: stmmac: tc: Fix TAPRIO division operation

[Jose Abreu]

For ARCHs that don't support 64 bits division we need to use the
helpers.

Fixes: b60189e0392f ("net: stmmac: Integrate EST with TAPRIO scheduler API")
Signed-off-by: Jose Abreu <Jose.Abreu@xxxxxxxxxxxx>

---
Completely untested as my setup is offline due to power-outrage. Carefull
review needed.
---
Cc: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 8ff8f9b9bb22..6c4686b77516 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -599,6 +599,7 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	struct timespec64 time;
 	bool fpe = false;
 	int i, ret = 0;
+	u64 ctr;
 
 	if (!priv->dma_cap.estsel)
 		return -EOPNOTSUPP;
@@ -694,8 +695,9 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	priv->plat->est->btr[0] = (u32)time.tv_nsec;
 	priv->plat->est->btr[1] = (u32)time.tv_sec;
 
-	priv->plat->est->ctr[0] = (u32)(qopt->cycle_time % NSEC_PER_SEC);
-	priv->plat->est->ctr[1] = (u32)(qopt->cycle_time / NSEC_PER_SEC);
+	ctr = qopt->cycle_time;
+	priv->plat->est->ctr[0] = do_div(ctr, NSEC_PER_SEC);
+	priv->plat->est->ctr[1] = (u32)ctr;
 
 	if (fpe && !priv->dma_cap.fpesel)
 		return -EOPNOTSUPP;
-- 
2.7.4