[PATCH 4.2.y-ckt 203/218] at803x: fix reset handling

From: Kamal Mostafa
Date: Thu Mar 31 2016 - 16:24:12 EST

4.2.8-ckt7 -stable review patch. If anyone has any objections, please let me know.


From: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>

commit d57019d1858a6f9b3ca05d76d793466ae428cfa3 upstream.

The driver of course "knows" that the chip's reset signal is active low,
so it drives the GPIO to 0 to reset the PHY and to 1 otherwise; however
all this will only work iff the GPIO is specified as active-high in the
device tree! I think both the driver and the device trees (if there are
any -- I was unable to find them) need to be fixed in this case...

Fixes: 13a56b449325 ("net: phy: at803x: Add support for hardware reset")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Acked-by: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
drivers/net/phy/at803x.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index fabf11d..5fbca04 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -198,7 +198,7 @@ static int at803x_probe(struct phy_device *phydev)
if (!priv)
return -ENOMEM;

- gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpiod_reset))
return PTR_ERR(gpiod_reset);

@@ -274,10 +274,10 @@ static void at803x_link_change_notify(struct phy_device *phydev)

at803x_context_save(phydev, &context);

- gpiod_set_value(priv->gpiod_reset, 0);
- msleep(1);
gpiod_set_value(priv->gpiod_reset, 1);
+ gpiod_set_value(priv->gpiod_reset, 0);
+ msleep(1);

at803x_context_restore(phydev, &context);