The first big pile of changes for v4.21/v5.1:

- DP Display Stream Compression preliminary work, helpers, etc. (Manasi, Anusha)
- Fix flex IO lane count programming (Manasi)
- GEM selftest updates (Chris, Matthew)
- ICL DSI enabling (Madhav, Jani)
- CSR firmware definition cleanup (Jani)
- CSR ICL stepping info, DC5/DC6 debugfs info (Jyoti)
- intel_display.c cleanups and code movement (Jani, Ville)
- PSR fixes and cleanup, enable PSR1 by default on gen9+ (José, Dhinakaran)
- Perf updates (Lionel)
- DP MST fixes (Lyude)
- Improved DP MST support logging (Ville)
- ICL workarounds (Oscar, Radhakrishna, Lucas, Anuj)
- Workaround cleanups (Rodrigo)
- HDCP 2.2 prep work (Ramalingam)
- AVI infoframes for LSPCON (Shashank)
- CRTC output formats YCBCR 4:2:0 and 4:4:4 (Shashank)
- ICL PLL refactoring (Vandita)
- Watermark fixes (Paulo)
- Master intr fixes (Mika)
- Amberlake platform (José, Shawn)
- Ensure HDA suspend/resume ordering (Imre)
- eDP orientation quirks (Hans)
- DP detect and link retrain fixes and cleanups (Dhinakaran)
- GuC fixes, cleanups and selftests (Daniele, Michal, Chris)
- ICL combophy/TC fixes and cleanups (Mahesh, Lucas, José)
- ICL RGB565 90/270 plane rotation (Juha-Pekka)
- HDMI 2.0 audio N values (Clint)
- Aux channel refactoring, ICL aux power fixes (Imre)
- Opregion suspend/resume improvement (Chris)
- Sort platform if ladders newest-to-oldest (Rodrigo)
- IPC fixes (José)
- PCH reset handshake fixes for PCH NOP (José)
- Store available engine masks in intel info (Tvrtko)
- Fix video DIP register definitions (Dhinakaran)
- ICL planar formats, NV12 (Maarten)
- Plane alpha blending support (Maarten)
- crtc->config usage removal cleanups (Maarten)
- Plane init cleanups (Ville)
- Use BITS_PER_TYPE (Chris)
- Remove i915.enable_ppgtt override (Chris)
- Scheduling priority improvements (Chris)
- Fix GTT 64-bit computations on 32-bit systems (Chris)
- A number of display fixes all around... (Ville)
- A number of GEM fixes all around... (Chris)
- Tons of other fixes and improvements (Everyone)
- Failure to properly credit everyone in the above changelog (Jani)
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