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xf86: allow DDX driver for GPU/PCI hot-plug

Shashank Sharma requested to merge contactshashanksharma/xserver-fork-shashank:push-pci-hotplug into master

The current X server infrastructure sets modesetting driver as default driver to handle PCI-hotplug of a GPU device. This prevents the respective DDX driver (like AMDGPU DDX driver) to take control of the card.

This patch:

  1. fine-tunes the PCI-hotplug infrastructure to allow the respective DDX driver to be loaded.
  2. scans and updates the PCI device list before adding the new GPU device in platform, so that the association of the platform device and PCI device is in place (dev->pdev).

V2:

  • Fixed typo in commit message (Martin)
  • Added R-B from Adam.
  • Added ACK from Alex and Martin.

V3:

  • Added an output class based approach for finding the DDX driver (Aaron)

Cc: Alex Deucher alexandar.deucher@amd.com

Suggested-by: Aaron Plattner aplattner@nvidia.com (v3) Acked-by: Martin Roukala martin.roukala@mupuf.org(v1) Acked-by: Alex Deucher alexander.deucher@amd.com (v1) Reviewed-by: Adam Jackson ajax@redhat.com(v1) Signed-off-by: Shashank Sharma shashank.sharma@amd.com

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