[U-Boot] [PATCH] pci: restore initialization for DM_PCI

[Tom Rini]

On Thu, Jan 21, 2016 at 04:35:33PM -0700, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> PCI controllers should be enumerated at startup so that PCI devices
> such as Ethernet controllers are available at startup. Fix board_init_r()
> not to skip calling pci_init() when CONFIG_DM_PCI is defined, and provide
> an implementation of pci_init() for the DM case.
> 
> Fixes: 96350f729c42 ("dm: tegra: net: Convert tegra boards to driver model
> for Ethernet")
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> ---
> I'm not sure if relying on the side-effects of calling
> uclass_{first,ext}_device is the correct approach; is there a more explicit
> way to probe all PCI controllers?
> 
> Arguably, perhaps we should introduce a "pci start" command instead of
> this change to be consistent with e.g. USB. However, that would be a
> regression relative to earlier versions of U-Boot.

So it's a good discussion to have.  In the U-Boot world, can we have
cases where we need PCI up before we could reasonably make use of
CONFIG_PREBOOT to ensure the board is in a good enough state to use for
most use cases?

-- 
Tom
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