What do we want? What can we do?

• Stability
• Better battery life
• More performance
• Fix bugs
• Better sound
• Better network throughput
• Faster storage access
• More free RAM thanks to fixing memory leaks or better memory management

Where can we improve things?

• Kernel
• Firmware (unlikely)
• HALs
• Properties
• Configuration files
• Write replacements for Qualcomm HALs or proprietary binaries

Device Trees

Things we can set in the device trees

Some things overlap of course, but not too much.

Audio

• Config files:
  • a2dp_audio_policy_configuration.xml
  • audio_effects.conf
  • audio_ext_spkr.conf
  • audio_output_policy.conf
  • audio_platform_info.xml
  • audio_platform_info_extcodec.xml
  • audio_platform_info_i2s.xml
  • audio_policy_configuration
  • audio_policy_volumes_drc.xml
  • audio_tuning_mixer.txt
  • mixer_paths.xml
  • mixer_paths_mtp.xml
• check TX/RX paths
• Soundtrigger/hotword detection:
  • sound_trigger_mixer_paths.xml
  • sound_trigger_platform_info.xml
• ACDB tweaks
• Configure Qualcomm Fluence, voice processing
• Tweak latencies: “nile-common: audio: Disable ULL mode” https://github.com/omnirom/android_device_sony_nile-common/commit/d9ff18ec6414595481ed5d4d44648c6c7b61a6b8 https://github.com/LineageOS/android_device_sony_nile-common/commit/4dc8401ba95a682e61585f563d78392d5b35df2c

Bluetooth

• Offloading, offloading HALs
• A2DP implementation
• Enable all possible codecs
• LDAC
• bdroid_buildconfig.h
• Low-Energy
• Channels

Block Devices

• Tune fstab
• Maybe use f2fs

https://github.com/lazerl0rd/device-sony-yoshino/commit/c6a9a94a88e85ac16c759990ff42eebfb888162b#diff-2a70d4c28762e80752b2d8d1ac74dbfe

GPS

• gps.conf
• Check servers
• Check XTRA versions

NFC

• Configs
• Check that models are correct

Sensors

• Angler: sensorlist.cpp

Debugging features

• Add our custom RPM etc. paths to the dump output of the dumpstate HAL
• Angler: dumpstate

Treble

• Update DM, FCM versions
• Update HAL versions of default ones
• Update radio@1.1 to 1.4
• Check that all devices go on PRODUCT_FULL_TREBLE

Wi-Fi

• Configs
  • p2p_supplicant_overlay.conf
  • wpa_supplicant_overlay.conf
  • wpa_supplicant_wcn.conf
  • wifi_concurrency_cfg.txt
  • WCNSS_qcom_cfg.ini
• Configure usable frequencies(DFS)

sec_config

https://github.com/LineageOS/android_device_google_bonito/blob/lineage-16.0/sec_config https://github.com/PixelExperience-Devices/device_xiaomi_tulip/blob/pie/configs/sec_config

seccomp

https://github.com/omnirom/android_device_motorola_potter/tree/android-9.0/seccomp_policy

Suspend HAL?

config_powerDecoupleAutoSuspendModeFromDisplay config_powerDecoupleInteractiveModeFromDisplay overlay/frameworks/base/core/res/res/values/config.xml https://github.com/omnirom/android_device_sony_nile-common/commit/c62a3be7b01f6a4f5da7f497d00c024e30448f96

msm_irqbalance

• Confirm whether IRQs are actually correct
• Ban/unban if needed
• Implement OSS irqbalance

https://github.com/PixelExperience-Devices/device_xiaomi_tulip/blob/pie/configs/msm_irqbalance.conf

HALs/Blobs

Things that we have to tweak HALs for or try to get proprietary binaries changed or write our own replacements.

Camera

vendor-qcom-opensource-camera:

• Shutter speed, exposure, whitebalance etc. parameters
• Fix CASH with timeouts instead of shutting off sensors
• Flash and shutter coordination

Kernel

• Loire: instabilities
• Tone: 5s bug, crashy mtp, heat on even low loads, bad battery life
• Yoshino: Buggy SDE (why does it only happen on GSIs?)
• Nile: Buggy SDE/sluggish stuttery display
• Tama: (Camera)

Update forked HALs

TODO: List of forked HALs that we should update from CAF

TODO/Inspiration

• https://github.com/LineageOS/android_device_huawei_angler/
• https://github.com/cryptomilk/android_device_sony_lilac/blob/lineage-16.0/system.prop
• https://github.com/omnirom/android_device_xiaomi_beryllium
• https://github.com/ResurrectionRemix-Devices/device_lenovo_kuntao/blob/pie/vendor_prop.mk
• https://github.com/ResurrectionRemix-Devices/device_lenovo_kuntao/blob/pie/bluetooth/bdroid_buildcfg.h
• https://github.com/ResurrectionRemix-Devices/device_lenovo_kuntao/tree/pie/audio
• https://github.com/omnirom/android_device_motorola_potter/blob/android-9.0/system.prop
• https://github.com/omnirom/android_device_motorola_potter/blob/android-9.0/device.mk
• https://github.com/omnirom/android_device_motorola_potter/tree/android-9.0/audio
• compress_offload:
• https://github.com/omnirom/android_device_sony_nile-common/blob/8edcbb4cebd597e39ccaa844ab25bc01d156ac2e/audio/audio_policy_configuration.xml#L92
• https://github.com/LineageOS/android_device_essential_mata
• https://github.com/omnirom/android_device_oneplus_oneplus5
• https://github.com/LineageOS/android_device_google_crosshatch
• https://github.com/LineageOS/android_device_google_wahoo
• https://github.com/LineageOS/android_device_google_bonito
• https://github.com/LineageOS/android_device_xiaomi_dipper
• https://github.com/PixelExperience-Devices/device_xiaomi_tulip/tree/pie/configs/gps
• https://github.com/PixelExperience-Devices/device_xiaomi_tulip/blob/pie/bluetooth/bdroid_buildcfg.h
• https://github.com/PixelExperience-Devices/device_xiaomi_tulip/commits/pie/audio
• https://github.com/enesuzun2002/android_device_samsung_zero-common
• https://github.com/MoKee/android_device_xiaomi_cepheus
• https://github.com/motoz2-force/android_device_motorola_nash
• https://github.com/LineageOS/android_device_huawei_kiwi

Misc

• Re-enable Android Beam on Q

Published by Felix on 2 Jun, 2019

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