From 26a2ad8a5418525d21f06083e65b10c932633209 Mon Sep 17 00:00:00 2001
From: Sean Wang <sean.wang@mediatek.com>
Date: Wed, 14 Sep 2016 23:13:18 +0800
Subject: [PATCH] net: ethernet: mediatek: add controlling power domain the
 ethernet belongs to

introduce power domain control which the digital circuit of
the ethernet belongs to inside the flow of hardware initialization
and deinitialization which helps the entire ethernet hardware block
could restart cleanly and completely as being back to the initial
state when the whole machine reboot.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 1272316a7d7b..01f59115132c 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -18,6 +18,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/clk.h>
+#include <linux/pm_runtime.h>
 #include <linux/if_vlan.h>
 #include <linux/reset.h>
 #include <linux/tcp.h>
@@ -1417,6 +1418,9 @@ static int __init mtk_hw_init(struct mtk_eth *eth)
 {
 	int i;
 
+	pm_runtime_enable(eth->dev);
+	pm_runtime_get_sync(eth->dev);
+
 	clk_prepare_enable(eth->clks[MTK_CLK_ETHIF]);
 	clk_prepare_enable(eth->clks[MTK_CLK_ESW]);
 	clk_prepare_enable(eth->clks[MTK_CLK_GP1]);
@@ -1484,6 +1488,9 @@ static int mtk_hw_deinit(struct mtk_eth *eth)
 	clk_disable_unprepare(eth->clks[MTK_CLK_ESW]);
 	clk_disable_unprepare(eth->clks[MTK_CLK_ETHIF]);
 
+	pm_runtime_put_sync(eth->dev);
+	pm_runtime_disable(eth->dev);
+
 	return 0;
 }