[RFC PATCH v3 0/2] Enable seamless boot (fastboot) for PTL

[Juasheem Sultan <jdsultan@google.com>]

Resending with cover letter from v2. There were no significant code
changes. Only resending due to mail failure.

This patch series is the second revision of a series of patches meant
to add support for seamless framebuffer handoff within the Xe driver.
It was tested on Panther Lake platforms.

The goal of this series is to achieve a flicker-free transition from
the bootloader (BIOS/UEFI) to the kernel driver by strictly adhering
to the hardware state established by the firmware.

Thank you for the feedback on the previous revision.

This new patch series was created with that feedback in mind. That
revision was too rough of an implementation that had a considerable
amount of useless code and fixed problems that it unecessarily
introduced. Because of that, I completely reworked and rewrote the
solution into a much smaller, efficient version that properly makes
use of the existing infrastructure. This patch series has two specific
focal points. It enables Xe to properly adopt a framebuffer from bios
by fixing how we read stolen memory and it synchronizes an inherited
crtc state with the new state so that we can perform an initial commit.
This allows us to achieve seamless handoff between the firmware and
kernel with minimal changes required.

---
Changes since v1
- v2 Complete rewrite of the code
- v3 Resending due to failure of patches to send

Juasheem Sultan (2):
  drm/xe/display: Fix reading the framebuffer from stolen memory
  drm/i915/display: Synchronize crtc_state for initial commit

 drivers/gpu/drm/i915/display/intel_display.c  | 19 ++++++++++++++++
 drivers/gpu/drm/xe/display/xe_plane_initial.c | 22 ++++++++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

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2.52.0.457.g6b5491de43-goog