[PATCH v3 1/3] phy: amlogic: phy-meson-gxl-usb2: fix shared reset controller use

[Amjad Ouled-Ameur]

Use reset_control_rearm() call if an error occurs in case
phy_meson_gxl_usb2_init() fails after reset() has been called ; or in case
phy_meson_gxl_usb2_exit() is called i.e the resource is no longer used
and the reset line may be triggered again by other devices.

reset_control_rearm() keeps use of triggered_count sane in the reset
framework. Therefore, use of reset_control_reset() on shared reset line
should be balanced with reset_control_rearm().

Signed-off-by: Amjad Ouled-Ameur <aouledameur@xxxxxxxxxxxx>
Reported-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
---
 drivers/phy/amlogic/phy-meson-gxl-usb2.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/amlogic/phy-meson-gxl-usb2.c b/drivers/phy/amlogic/phy-meson-gxl-usb2.c
index 2b3c0d730f20..9a9c769ecabc 100644
--- a/drivers/phy/amlogic/phy-meson-gxl-usb2.c
+++ b/drivers/phy/amlogic/phy-meson-gxl-usb2.c
@@ -110,8 +110,10 @@ static int phy_meson_gxl_usb2_init(struct phy *phy)
 	int ret;
 
 	ret = reset_control_reset(priv->reset);
-	if (ret)
+	if (ret) {
+		reset_control_rearm(priv->reset);
 		return ret;
+	}
 
 	ret = clk_prepare_enable(priv->clk);
 	if (ret)
@@ -125,6 +127,7 @@ static int phy_meson_gxl_usb2_exit(struct phy *phy)
 	struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
 
 	clk_disable_unprepare(priv->clk);
+	reset_control_rearm(priv->reset);
 
 	return 0;
 }
-- 
2.25.1