[PATCH v11 2/4] PCI: designware: Add generic dw_pcie_wait_for_link()

[Pratyush Anand]

On Fri, Feb 26, 2016 at 10:00 PM, Bjorn Helgaas <bhelgaas at google.com> wrote:
> From: Joao Pinto <Joao.Pinto at synopsys.com>
>
> Several DesignWare-based drivers (dra7xx, exynos, imx6, keystone, qcom, and
> spear13xx) had similar loops waiting for the link to come up.
>
> Add a generic dw_pcie_wait_for_link() for use by all these drivers so the
> waiting is done consistently, e.g., always using usleep_range() rather than
> mdelay() and using similar timeouts and retry counts.
>
> Note that this changes the Keystone link training/wait for link strategy,
> so we initiate link training, then wait longer for the link to come up
> before re-initiating link training.
>
> [bhelgaas: changelog, split into its own patch, update pci-keystone.c, pcie-qcom.c]
> Signed-off-by: Joao Pinto <jpinto at synopsys.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>

5 retries should be sufficient for keystone, still it would be good to
have a tested-by for it.
Other than that code seems fine to me.

Acked-by: Pratyush Anand <pratyush.anand at gmail.com>