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mx6cuboxi: Fix the reset delay for the AR8035 PHY

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Since commit 59370f3fcd ("net: phy: delay only if reset handler is
registered") Ethernet is no longer functional:

Booting from net ...
FEC Waiting for PHY auto negotiation to complete......... TIMEOUT !
BOOTP broadcast 1
BOOTP broadcast 2
BOOTP broadcast 3
BOOTP broadcast 4

This commit does not have an issue in itself, but it revelead a problem
with the Ethernet initialization.

As per the AR8035 datasheet:

"For a reliable power on reset, suggest to keep asserting the reset
low long enough (10ms) to ensure the clock is stable and clock-to-reset
1ms requirement is satisfied."

So do as suggested and keep the reset low for 10ms.

Also add a 100us delay after deasserting the reset line
to guarantee that the PHY ID can be read correctly and the Atheros
PHY can be loaded as per Troy Kisky's suggestion.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Fabio Estevam 2016-01-04 21:38:08 -02:00 committed by Stefano Babic
parent 587c3f8ebe
commit 4b421d4ea1
1 changed files with 2 additions and 1 deletions
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3
board/solidrun/mx6cuboxi/mx6cuboxi.c
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@ -143,8 +143,9 @@ static void setup_iomux_enet(void)
SETUP_IOMUX_PADS(enet_pads);
gpio_direction_output(ETH_PHY_RESET, 0);
mdelay(2);
mdelay(10);
gpio_set_value(ETH_PHY_RESET, 1);
udelay(100);
}
int board_phy_config(struct phy_device *phydev)