[PATCH 17/29] net: mediatek: optimize the switch reset delay wait time

[Weijie Gao]

Not all switches requires 1 second delay after deasserting reset.
MT7531 requires only maximum 200ms.

This patch defines dedicated reset wait time for each switch chip, and will
significantly improve the boot time for boards using MT7531.

Signed-off-by: Weijie Gao <weijie.gao at mediatek.com>
---
 drivers/net/mtk_eth.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mtk_eth.c b/drivers/net/mtk_eth.c
index 90f1d2591b..cd72070ff6 100644
--- a/drivers/net/mtk_eth.c
+++ b/drivers/net/mtk_eth.c
@@ -127,6 +127,7 @@ struct mtk_eth_priv {
 	u32 mt753x_smi_addr;
 	u32 mt753x_phy_base;
 	u32 mt753x_pmcr;
+	u32 mt753x_reset_wait_time;
 
 	struct gpio_desc rst_gpio;
 	int mcm;
@@ -943,12 +944,12 @@ int mt753x_switch_init(struct mtk_eth_priv *priv)
 		reset_assert(&priv->rst_mcm);
 		udelay(1000);
 		reset_deassert(&priv->rst_mcm);
-		mdelay(1000);
+		mdelay(priv->mt753x_reset_wait_time);
 	} else if (dm_gpio_is_valid(&priv->rst_gpio)) {
 		dm_gpio_set_value(&priv->rst_gpio, 0);
 		udelay(1000);
 		dm_gpio_set_value(&priv->rst_gpio, 1);
-		mdelay(1000);
+		mdelay(priv->mt753x_reset_wait_time);
 	}
 
 	ret = priv->switch_init(priv);
@@ -1528,11 +1529,13 @@ static int mtk_eth_of_to_plat(struct udevice *dev)
 			priv->switch_init = mt7530_setup;
 			priv->switch_mac_control = mt7530_mac_control;
 			priv->mt753x_smi_addr = MT753X_DFL_SMI_ADDR;
+			priv->mt753x_reset_wait_time = 1000;
 		} else if (!strcmp(str, "mt7531")) {
 			priv->sw = SW_MT7531;
 			priv->switch_init = mt7531_setup;
 			priv->switch_mac_control = mt7531_mac_control;
 			priv->mt753x_smi_addr = MT753X_DFL_SMI_ADDR;
+			priv->mt753x_reset_wait_time = 200;
 		} else {
 			printf("error: unsupported switch\n");
 			return -EINVAL;
-- 
2.17.1