[V5,00/13] Fixes to pcie-tegra194 driver

[Manikanta Maddireddy <mmaddireddy@nvidia.com>]

This series[1] was originally posted by Vidya Sagar, and I have rebased
it onto 6.19.0-rc6-next. I addressed review comments and split this into
two series, one for fixes(current) and the other is for enhancements.
I verified these patches on Jetson AGX Orin(Tegra234 SoC).

I added below four new patches to fix bugs, commit message of each
patch has the details on the bug and fix.
 - PCI: tegra194: Use HW version number
 - PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on
 - PCI: tegra194: Disable PERST IRQ only in Endpoint mode 

Rest of the patches are same as the original V3 series, just rebased them on
6.19.0-rc6-next.

Verification details.
 - I verified both Root port and Endpoint mode controllers on Tegra234 SoC.
 - Basic sanity Link up, configuration space access and BAR access are verified.
 - I verified that ASPM L1.2 capability is disabled for Endpoint mode.
 - I verified suspend to RAM tests with Endpoint mode.

[1] https://patchwork.kernel.org/project/linux-pci/patch/20221013183854.21087-1-vidyas@nvidia.com/

Manikanta Maddireddy (3):
  PCI: tegra194: Use HW version number
  PCI: tegra194: Fix CBB timeout caused by DBI access before core
    power-on
  PCI: tegra194: Disable PERST IRQ only in Endpoint mode

Vidya Sagar (10):
  PCI: tegra194: Fix polling delay for L2 state
  PCI: tegra194: Refactor LTSSM state polling on surprise down
  PCI: tegra194: Don't force the device into the D0 state before L2
  PCI: tegra194: Free up EP resources during remove()
  PCI: tegra194: Disable direct speed change for EP
  PCI: tegra194: Use devm_gpiod_get_optional() to parse
    "nvidia,refclk-select"
  PCI: tegra194: Apply pinctrl settings for both PCIe RP and EP
  PCI: tegra194: Free resources during controller deinitialization
  PCI: tegra194: Allow system suspend when the Endpoint link is not up
  PCI: tegra194: Set LTR message request before PCIe link up

 drivers/pci/controller/dwc/pcie-designware.c |   2 +-
 drivers/pci/controller/dwc/pcie-designware.h |   2 +
 drivers/pci/controller/dwc/pcie-tegra194.c   | 191 +++++++++----------
 3 files changed, 95 insertions(+), 100 deletions(-)

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2.34.1