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authorRandy Li <ayaka@soulik.info>2016-09-09 21:59:38 +0300
committerKishon Vijay Abraham I <kishon@ti.com>2016-09-10 15:01:40 +0300
commit0f74ab59ce8712e7e2bb1e4517033328e626b27c (patch)
tree1ca266805ec19489374b58eae23fedbbc7a1b504 /drivers/phy
parentcac18ecb6f44b11bc303d7afbae3887b27938fa4 (diff)
downloadlinux-0f74ab59ce8712e7e2bb1e4517033328e626b27c.tar.xz
phy: rockchip-usb: use rockchip_usb_phy_reset to reset phy during wakeup
It is a hardware bug in RK3288, the only way to solve it is to reset the phy. Signed-off-by: Randy Li <ayaka@soulik.info> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/phy-rockchip-usb.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
index 2a7381f4fe4c..734987fa0ad7 100644
--- a/drivers/phy/phy-rockchip-usb.c
+++ b/drivers/phy/phy-rockchip-usb.c
@@ -29,6 +29,7 @@
#include <linux/reset.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
+#include <linux/delay.h>
static int enable_usb_uart;
@@ -64,6 +65,7 @@ struct rockchip_usb_phy {
struct clk_hw clk480m_hw;
struct phy *phy;
bool uart_enabled;
+ struct reset_control *reset;
};
static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
@@ -144,9 +146,23 @@ static int rockchip_usb_phy_power_on(struct phy *_phy)
return clk_prepare_enable(phy->clk480m);
}
+static int rockchip_usb_phy_reset(struct phy *_phy)
+{
+ struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
+
+ if (phy->reset) {
+ reset_control_assert(phy->reset);
+ udelay(10);
+ reset_control_deassert(phy->reset);
+ }
+
+ return 0;
+}
+
static const struct phy_ops ops = {
.power_on = rockchip_usb_phy_power_on,
.power_off = rockchip_usb_phy_power_off,
+ .reset = rockchip_usb_phy_reset,
.owner = THIS_MODULE,
};
@@ -185,6 +201,10 @@ static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
return -EINVAL;
}
+ rk_phy->reset = of_reset_control_get(child, "phy-reset");
+ if (IS_ERR(rk_phy->reset))
+ rk_phy->reset = NULL;
+
rk_phy->reg_offset = reg_offset;
rk_phy->clk = of_clk_get_by_name(child, "phyclk");