[RFC] PCI: pci-imx6: Add delay to workaround kernel hang

[Uwe Kleine-König]

Hello,

On Tue, Jun 24, 2014 at 04:18:27PM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam at freescale.com>
> 
> When the mx6 PCI conctroller is initialized in the bootloader we see a kernel 
> hang inside imx6_add_pcie_port().
> 
> Adding a 30ms delay allows the kernel to boot.
Just my thought on how to debug that: I'd try to bisect the pci init
routine in the boot loader. I.e. first only do the first half of the
initialisation in U-Boot. Depending on Linux being able to boot or not
initialize more or less on the next run.

Maybe there is a single register write that makes Linux fail?!

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |