Initial support for Qualcomm Snapdragon 820 chipset

[Paolo Pisati]

Impact:

Although the Bionic/snapdragon kernel contains the BSP from the Qualcomm landing tree kernel[1], it didn't work on Snapdragon 820 based board (e.g. Qualcomm DB820C APQ8096).

Fix:

Import the necessary patches to make it boot on such a board (and clones).

How to test:

1) put the board in fastboot mode (see [2])
2) generate a compatible boot.img:

$ cat linux/arch/arm64/boot/Image.gz linux/arch/arm64/boot/dts/qcom/apq8096-db820c.dtb > Image.gz+dtb
$ touch ramdisk
$ python android/system/core/mkbootimg/mkbootimg.py --kernel Image.gz+dtb --ramdisk ramdisk --pagesize 4096 --base 0x80000000 --kernel_offset 0x8000 --ramdisk_offset 0x1000000 --tags_offset 0x100 --cmdline 'console=ttyMSM0,115200n8 root=/dev/sda1 net.ifnames=0 init=/lib/systemd/systemd ro rootwait rng_core.default_quality=700 panic=-1 fixrtc earlyprintk earlycon=msm_serial_dm,0x75b0000' --output bionic-snapdragon-db820c-boot.img

3) boot the board using the generated boot.img:

$ fastboot boot bionic-snapdragon-db820c-boot.img

Regression potential:

With new code there's always a degree of regression potential, but all patches (but one) came from Linus's upstream tree, and the only external one, came direclty from the qcom-lt 4.14 tree.

1: https://git.linaro.org/landing-teams/working/qualcomm/kernel.git/log/?h=release/qcomlt-4.14
2: https://www.96boards.org/documentation/consumer/dragonboard/dragonboard820c/installation/board-recovery.md.html

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-snapdragon - 4.15.0-1058.64

---------------
linux-snapdragon (4.15.0-1058.64) bionic; urgency=medium

  * linux-snapdragon: 4.15.0-1058.64 -proposed tracker (LP: #1834925)

  * Initial support for Qualcomm Snapdragon 820 chipset (LP: #1832012)
    - clk: qcom: Register the gdscs before the clocks
    - scsi: ufs: Extract devfreq registration
    - scsi: ufs: Use freq table with devfreq
    - scsi: ufshcd: Fix NULL pointer dereference for in ufshcd_init
    - Revert "PCI: qcom: add runtime pm support to pcie_port"
    - PCI: qcom: add runtime pm support to pcie_port
    - PCI: qcom: Fix error handling in runtime PM support
    - PCI: qcom: Don't deassert reset GPIO during probe
    - Revert "phy: qcom-qmp: Fix failure path in phy_init functions"
    - Revert "phy: qcom-qmp: Fix phy pipe clock gating"
    - Revert "phy: qcom-qmp: Fix failure path in phy_init functions"
    - phy: qcom-qmp: Fix failure path in phy_init functions
    - phy: qcom-qmp: Fix phy pipe clock gating
    - phy: qcom-qmp: Adapt to clk_bulk_* APIs
    - phy: qcom-qmp: Power-on PHY before initialization
    - phy: qcom-qusb2: Power-on PHY before initialization
    - phy: qcom-qmp: Fix PHY block reset sequence
    - phy: qcom-qmp: Move SERDES/PCS START after PHY reset
    - phy: qcom-qusb2: Add support for different register layouts
    - phy: qcom-qusb2: Add support for QUSB2 V2 version
    - phy: qcom-qmp: Move register offsets to header file
    - phy: qcom-qmp: Add register offsets for QMP V3 PHY
    - phy: qcom-qmp: Add support for QMP V3 USB3 PHY
    - phy: Add USB speed related PHY modes
    - phy: qcom-qusb2: Add support for runtime PM
    - phy: qcom-qmp: Add support for runtime PM
    - phy: add SPDX identifier to QMP and QUSB2 PHY drivers
    - phy: qcom-qmp: Enable pipe_clk before PHY initialization
    - dt-bindings: phy-qcom-qusb2: Update binding for QUSB2 V2 version
    - dt-bindings: phy-qcom-usb2: Add support to override tuning values
    - phy: qcom-qmp: Add QMP V3 USB3 UNI PHY support for sdm845
    - phy: qcom-qusb2: Add QUSB2 PHYs support for sdm845
    - phy: qcom-usb-hs: Mark expected switch fall-through
    - phy: qcom-qmp: Quiet -EPROBE_DEFER from qcom_qmp_phy_probe()
    - phy: qcom-qusb2: Quiet -EPROBE_DEFER from qusb2_phy_probe()
    - phy: Convert to using %pOFn instead of device_node.name
    - phy: Update PHY power control sequence
    - phy: General struct and field cleanup
    - phy: Add QMP phy based UFS phy support for sdm845
    - phy: qcom-ufs: Remove stale methods that handle ref clk
    - scsi/ufs: qcom: Remove ufs_qcom_phy_*() calls from host
    - phy: qcom-ufs: Declare 20nm qcom ufs qmp phy as Broken
    - phy: qcom-qusb2: Use HSTX_TRIM fused value as is
    - phy: qcom-qusb2: Fix HSTX_TRIM tuning with fused value for SDM845
    - phy: core: Allow phy_pm_runtime_xxx API calls with NULL phy
    - phy: core: rework phy_set_mode to accept phy mode and submode
    - phy: qcom-qmp: Utilize fully-specified DT registers
    - phy: qcom-qmp: Expose provided clocks to DT
    - phy: qcom-ufs: Use iopoll.h readl_poll_timeout macro
    - phy: qcom-qmp: Add QMP V3 USB3 PHY support for msm8998
    - phy: qc...