Ecipse-Kernel 5.4.303

### Kernel Changelog

# Power, Charging & Thermal

* Fixed BQ25890 charger state transitions during USB-PD charging.
* Reworked thermal charging logic and fixed potential issues with CPU thermal limit handling.
* Optimized the thermal/cpu cooling driver to reduce overhead when identifying CPU clusters.
* Adjusted panic reset handling to preserve kmsg and the reboot reason.
* Optimized idle and suspend states, including timer, notifier, and low-power state handling.
* Removed unnecessary DRM panel notifier dependencies and optimized `sleep_disabled` handling.

# CPUFreq & Scheduler

* Optimized `schedutil`, including the default rate limit, optional iowait boost, and support for dropping frequency on individual CPUs without idling.
* Applied Android scheduler tweaks and optimized the generic idle loop.
* Optimized IRQ affinity management and added more efficient cpumask helpers.
* Adjusted CPU feature handling for heterogeneous architectures and relaxed feature sanity checking where appropriate.
* Optimized the kernel for Snapdragon 695 with device-specific compiler flags and performance tuning.
* Tuned UCLAMP and general scheduler behavior for performance.

# Memory & Low Memory Killer

* Integrated and optimized Simple Low Memory Killer, improving victim management, reclaim, priorities, timeouts, and swap handling.
* Optimized `vmpressure` and reclaim behavior to improve response to memory pressure.
* Reduced memory overhead by disabling kmem/socket accounting and unnecessary debugging/profiling features.
* Added support for memory reclaim through `memory.reclaim`.
* Optimized several small allocations by replacing dynamic allocations with stack buffers or cached structures.
* Optimized memory shrinkers and locks to reduce contention.
* Adjusted pageblock sizing to reduce scheduling delays.
* Added ZRAM memory tracking and writeback support.
* Optimized per-CPU ZRAM stream management.

# ZRAM, Compression & Storage

* Updated the Zstandard implementation to newer upstream releases, reaching the 1.5.7 series.
* Added F2FS optimizations to reduce allocations, congestion, and garbage collection overhead.
* Configured F2FS GC to run with lower scheduler and I/O priority.
* Enabled storage optimizations and RELR relocation packing.
* Enabled block security and I/O throttling features.
* Set `noatime` as the default filesystem mount behavior.

# GPU & Display

* Tuned Moonstone GPU busy behavior by reducing the busy penalty and improving frequency responsiveness.
* Raised GPU DDR bus frequency floors.
* Optimized KGSL with lockless page pools, improved shrinker handling, better fence handling, and reduced tracing overhead.
* Optimized display and IRQ hot paths by removing redundant operations and unnecessary buffer copies.
* Removed unnecessary PM QoS requests from the display subsystem.
* Disabled unused graphics debugging and monitoring components.

# Media, Camera & Audio

* Fixed Venus 10-bit bit-depth change handling, correctly selecting TP10/UWC and DPB formats when the firmware detects a bit-depth change.
* Updated camera-kernel to the latest CLO LAHAINA code.
* Removed the unnecessary `camera_debug_util` implementation.
* Imported Xiaomi changes to the GPU, MMC, video, and misc drivers.
* Optimized ASoC with power-efficient workqueues and removed unnecessary PM QoS usage.
* Fixed FM recording mixer setup and simplified static array handling.

# Touchscreen & I/O

* Improved the FocalTech touchscreen driver with IRQ priority boosting, AVDD GPIO support, and missing ESD/PRC definitions.
* Reduced I2C GENI error log spam.
* Optimized MSM pinctrl operations while retaining the required barriers to guarantee correct I/O write ordering.

# Power Management & Idle

* Optimized `cpuidle`/LPM to avoid unnecessary work when the system is restricted to WFI.
* Deep idle states are now managed according to the screen state.
* Tuned LPM timers and exit latencies to avoid unnecessary operations.
* Enabled `NO_HZ_IDLE` to reduce scheduler ticks and wakeups during idle, standby, and screen-off states.
* Enabled power-efficient workqueues by default.
* Removed unnecessary LPM dependencies and debug event logging.

# Kernel Configuration & Hardening

* Cleaned up `stone_defconfig`, disabling unused features, debugging, tracing, profiling, loadable modules, and unnecessary GKI components.
* Enabled useful features such as 64-bit SCM, block security, I/O throttling, compaction, fair group scheduling, and writeback throttling.
* Configured binderfs to use `0755` as its default mount mode.
* Enabled checkpoint/restore support.
* Disabled low-value features and statistics to reduce memory usage and overhead.
* Enabled ARM64 LSE atomics and dead code elimination optimizations.
* Tuned security, watchdog, softlock detector, and scheduler statistics according to device requirements.

# Network

* Configured FQ as the default network scheduler.
* Configured BBR as the default TCP congestion control algorithm.
* Increased the maximum TUN MTU to `65536`.
* Adjusted congestion control configuration to retain BBR support.

# Kernel Base & Compatibility

* Updated the kernel to **Linux 5.4.303 LTS**, incorporating upstream security, stability, and bug fixes.
* Updated 5.4.y kernel metadata.
* Applied crypto/AF_ALG fixes covering size validation, concurrency, IV handling, and scatterlist operations.
* Added optimizations and fixes to ashmem, binder, kernfs, exec, and other subsystems.
* Added Fake Uname compatibility improvements, including Android 5.10 support and optimized process matching.
* Added `shmem_set_file` to ashmem.
* Adjusted `struct file` alignment.
* Disabled io_uring and other unused device features.

# IRQ, Locking & Performance

* Fixed IRQ affinity handling to prevent unsupported multi-CPU affinity masks.
* Added warnings for overwritten IRQ affinity notifiers.
* Optimized locks, rtmutex, and synchronization paths.
* Removed redundant memory barriers and unnecessary `noinline` usage.
* Optimized hot paths in display, DMA-BUF, binder, and filesystem code.
* Reduced debugging and tracing overhead across critical subsystems.

# Xiaomi / Device Specific

* Integrated various Xiaomi-specific changes across platform drivers.
* Recalculated the Energy Model for Holi and Blair platforms.
* Disabled unused monitoring/coresight components and power supply drivers.
* Added Snapdragon 695 and Stone/Moonstone-specific optimizations.
* Updated thermal behavior with the integration of Xiaomi's rewritten thermal implementation.

# Filesystem & Security

* Optimized F2FS, fscrypt, and kernfs operations to reduce dynamic memory allocations.
* Removed additional Android/CAF filesystem tracing.
* Hid `/system/addon.d` from user applications.
* Enabled DM-Verity with `DM_VERITY_OPT_AT_MOST_ONCE`.
* Added block security and I/O management features.