[PATCH v8 00/14] 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

I added fixes tag for below patch and moved this to this series from enhancements series
 - PCI: tegra194: Disable L1.2 capability of Tegra234 EP

Rest of the patches are same as the original V3 series, rebased them on
6.19.0-rc6-next and addressed minor review comments.

I reordered the patches with regard to fixes tag.

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 (6):
  PCI: tegra194: Increase LTSSM poll time on surprise down
  PCI: tegra194: Disable LTSSM after transition to detect on surprise
    down
  PCI: tegra194: Disable PERST IRQ only in Endpoint mode
  PCI: tegra194: Use DWC IP core version
  PCI: dwc: Apply ECRC workaround to DesignWare 5.00a as well
  PCI: tegra194: Fix CBB timeout caused by DBI access before core
    power-on

Vidya Sagar (8):
  PCI: tegra194: Fix polling delay for L2 state
  PCI: tegra194: Don't force the device into the D0 state before L2
  PCI: tegra194: Use devm_gpiod_get_optional() to parse
    "nvidia,refclk-select"
  PCI: tegra194: Disable direct speed change for Endpoint
  PCI: tegra194: Set LTR message request before PCIe link up
  PCI: tegra194: Allow system suspend when the Endpoint link is not up
  PCI: tegra194: Free up EP resources during remove()
  PCI: tegra194: Disable L1.2 capability of Tegra234 EP

 drivers/pci/controller/dwc/pcie-designware.c |   4 +-
 drivers/pci/controller/dwc/pcie-designware.h |   2 +
 drivers/pci/controller/dwc/pcie-tegra194.c   | 199 ++++++++++---------
 3 files changed, 109 insertions(+), 96 deletions(-)

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2.34.1