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Intel Preps New Performance Optimizations & Features For Linux 6.15 Graphics Driver

In addition to AMD beginning to queue graphics driver improvements for Linux 6.15, Intel open-source engineers are doing the same and this morning sent out their initial feature pull request to DRM-Next of the i915/Xe kernel graphics/display driver improvements they have been working on for the upcoming Linux 6.15 kernel.

Additional feature work is still expected to be submitted over the next week or two while out today is the big one with many changes ready for this next kernel version. This Intel graphics code update also has improvements around its Display State Buffer (DSB) DMA engine for reducing CPU work. Features and functionality: - Enable DP 128b/132b SST DSC - Allow DSB to perform commits when VRR is enabled - Compute HDMI PLLs for SNPS/C10 PHYs for rates not in fixed tables - Allow DSB usage when PSR is enabled on LNL+ - Enable Panel Replay mode change without full modeset - Enable async flips with compressed buffers on ICL+ - Support luminance based brightness control via DPCD for eDP - Enable VRR enable/disable without full modeset - Add debugfs facility for force testing HDCP 1.4 - Add scaler tracepoints, improve plane tracepoints - Improve DMC wakelock debugging facilities - Allow GuC SLPC default strategies on MTL+ for performance - Provide more information on display faults Refactoring and cleanups: - Continue conversions to struct intel_display - Joiner and Y plane reorganization - Move HDCP debugfs to intel_hdcp.c - Clean up and unify LSPCON interfaces - Move code out of intel_display.c to reduce its size - Clean up and simplify DDI port enabling/disabling - Make LPT LP a dedicated PCH type, refactor - Simplify DSC range BPG offset calculation - Scaler cleanups - Remove unused code from GVT - Improve plane debugging - DSB and VRR refactoring

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