netdev - Re: [PATCHv6 RFT] net: fec: Ensure clocks are enabled while using mdio bus

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Date:	Sat, 25 Jul 2015 21:14:12 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	netdev <netdev@...r.kernel.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	Tyler Baker <tyler.baker@...aro.org>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCHv6 RFT] net: fec: Ensure clocks are enabled while using
 mdio bus

Hi Andrew,

On Sat, Jul 25, 2015 at 5:38 PM, Andrew Lunn <andrew@...n.ch> wrote:
> When a switch is attached to the mdio bus, the mdio bus can be used
> while the interface is not open. If the IPG clock is not enabled, MDIO
> reads/writes will simply time out.
>
> Add support for runtime PM to control this clock. Enable/disable this
> clock using runtime PM, with open()/close() and mdio read()/write()
> function triggering runtime PM operations. Since PM is optional, the
> IPG clock is enabled at probe and is no longer modified by
> fec_enet_clk_enable(), thus if PM is not enabled in the kernel, it is
> guaranteed the clock is running when MDIO operations are performed.
>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> Cc: tyler.baker@...aro.org
> Cc: fabio.estevam@...escale.com
> Cc: shawn.guo@...aro.org
> ---
>
> v5 was accepted and then reverted, because it broke imx6.  Lucas Stach
> debugged what was going wrong and provided a patch. Thanks Lucas. This
> has been squashed into v6.
>
> It would be good if this version had more testing on various platforms
> before it is accepted. If you reported a problem last time, please do
> test and send a Tested-by:

With this version I can boot via NFS on a mx6 board:

Tested-by: Fabio Estevam <fabio.estevam@...escale.com>

Thanks
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