Merge branch 'pci/ctrl/imx6'

- Factor out ref clock disables to match enables (Bjorn Helgaas)

- Collect clock enables in imx6_pcie_clk_enable() (Richard Zhu)

- Propagate regulator and clock errors back to .host_init() caller (Richard
  Zhu)

- Disable i.MX6QDL clock when disabling ref clocks (Richard Zhu)

- Call host init function directly in resume instead of duplicating the
  code (Richard Zhu)

- Turn off regulators when suspending (Richard Zhu)

- Make link being down a non-fatal error so probe doesn't fail (Richard
  Zhu)

- Start link in resume only if it was up before suspend to reduce resume
  time (Richard Zhu)

- Move PHY init and power-on out of clock- and reset-related functions
  (Richard Zhu)

- Rework suspend callback to be more symmetric with resume (Richard Zhu)

- Set PCIE_DBI_RO_WR_EN before writing DBI registers (Richard Zhu)

- Allow speeds faster than Gen2 (Richard Zhu)

* pci/ctrl/imx6:
  PCI: imx6: Support more than Gen2 speed link mode
  PCI: imx6: Set PCIE_DBI_RO_WR_EN before writing DBI registers
  PCI: imx6: Reformat suspend callback to keep symmetric with resume
  PCI: imx6: Move the imx6_pcie_ltssm_disable() earlier
  PCI: imx6: Disable clocks in reverse order of enable
  PCI: imx6: Do not hide PHY driver callbacks and refine the error handling
  PCI: imx6: Reduce resume time by only starting link if it was up before suspend
  PCI: imx6: Mark the link down as non-fatal error
  PCI: imx6: Move regulator enable out of imx6_pcie_deassert_core_reset()
  PCI: imx6: Turn off regulator when system is in suspend mode
  PCI: imx6: Call host init function directly in resume
  PCI: imx6: Disable i.MX6QDL clock when disabling ref clocks
  PCI: imx6: Propagate .host_init() errors to caller
  PCI: imx6: Collect clock enables in imx6_pcie_clk_enable()
  PCI: imx6: Factor out ref clock disable to match enable
  PCI: imx6: Move imx6_pcie_clk_disable() earlier
  PCI: imx6: Move imx6_pcie_enable_ref_clk() earlier
  PCI: imx6: Move PHY management functions together
  PCI: imx6: Move imx6_pcie_grp_offset(), imx6_pcie_configure_type() earlier
  PCI: imx6: Convert to NOIRQ_SYSTEM_SLEEP_PM_OPS()