Re: Need help with mdiobus_register and phy

On Thu, Oct 13, 2016 at 06:15:39PM -0500, Timur Tabi wrote:

I need help with a program I've discovered with my driver
(ethernet/qualcomm/emac/) that occurs in the following process:

1. Load the driver
1a. Driver calls mdiobus_register (see emac_phy_config), which calls
mdiobus_scan(), which calls get_phy_device()
1b. get_phy_device() performs MDIO bus operations, which means the
bus and the external phy need to be active.
2. Bring up the interface
3. Bring down the interface.  This calls phy_disconnect() which
calls phy_detach() which calls phy_suspend().  This puts the
external phy to sleep.
4. Unload the driver
5. Re-load the driver.
5a. Driver calls mdiobus_register again, but this time the call to
get_phy_device() fails because the external phy is asleep and does
not respond to MDIO transactions.

Hi Timur

Normally, a sleeping PHY does respond to MDIO. Otherwise, how do you
wake it?

So i assume this phy has some other means to wake it. What is this
means?

      Andrew