mlxbf_gige: increase MDIO polling rate to 5us

dthompso · kuba-moo · commit 0a02e282bad4 · 2022-05-06T15:54:20.000-07:00
This patch increases the polling rate used by the mlxbf_gige driver on the MDIO bus. The previous polling rate was every 100us, and the new rate is every 5us. With this change the amount of time spent waiting for the MDIO BUSY signal to de-assert drops from ~100us to ~27us for each operation. Signed-off-by: David Thompson <davthompson@nvidia.com> Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com> Link: https://lore.kernel.org/r/20220505162309.20050-1-davthompson@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio.c b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_mdio.c
@@ -105,7 +105,8 @@ static int mlxbf_gige_mdio_read(struct mii_bus *bus, int phy_add, int phy_reg)
 	writel(cmd, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
 
 	ret = readl_poll_timeout_atomic(priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET,
-					val, !(val & MLXBF_GIGE_MDIO_GW_BUSY_MASK), 100, 1000000);
+					val, !(val & MLXBF_GIGE_MDIO_GW_BUSY_MASK),
+					5, 1000000);
 
 	if (ret) {
 		writel(0, priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET);
@@ -137,7 +138,8 @@ static int mlxbf_gige_mdio_write(struct mii_bus *bus, int phy_add,
 
 	/* If the poll timed out, drop the request */
 	ret = readl_poll_timeout_atomic(priv->mdio_io + MLXBF_GIGE_MDIO_GW_OFFSET,
-					temp, !(temp & MLXBF_GIGE_MDIO_GW_BUSY_MASK), 100, 1000000);
+					temp, !(temp & MLXBF_GIGE_MDIO_GW_BUSY_MASK),
+					5, 1000000);
 
 	return ret;
 }
