Qualcomm Snapdragon 820/821 (MSM8996): Difference between revisions
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| status_i2c = Y | | status_i2c = Y | ||
| status_audio = Y | | status_audio = Y | ||
| status_video = | | status_video = Y | ||
| status_thermal = Y | | status_thermal = Y | ||
| status_wifi = - | | status_wifi = - |
Revision as of 11:29, 4 June 2021
Manufacturer | Qualcomm |
---|---|
Name | MSM8996 |
Codenames | msmthulium/apqthulium |
Architecture | aarch64 |
CPU | 2x 2.2/2.3 GHz Kryo, 2x 1.6 GHz Kryo |
GPU | Adreno 530 |
Year | 2016 |
Process | 14nm |
Mainline | yes |
Components | |
CPU |
Partial |
UART |
Works |
Storage |
Partial |
USB |
Works |
Display |
Works |
GPU |
Works |
Pinctrl |
Works |
I²C |
Works |
SPI |
No data |
Audio |
Works |
Video |
Works |
Thermal |
Works |
Modem |
Partial |
GPS |
No data |
Camera |
No data |
NPU |
No data |
Suspend |
No data |
Ethernet |
No data |
SATA |
No data |
MSM8996/APQ8096 (or Snapdragon 820) is a Qualcomm SoC released in 2016, with great mainline support orginally added for the Dragonboard 820c. There is also a slightly higher clocked (and supposedly less problematic architecture-wise) MSM8996Pro also known as Snapdragon 821.
Devices
APQ8096(SG) (Snapdragon 820E, WiFi-only)
No results
MSM8996 (Snapdragon 820)
No results
MSM8996Pro (Snapdragon 821)
No results
Booting
On at least the Xiaomi Mi Note 2, some IOMMU hacks (1, 2) are needed to let it to boot properly. Otherwise it would crash and reboot as soon as the MDP SMMU is probed.
Display
Mainline is missing DSI device tree nodes at the moment but there are patches that add them, one of which is in the SoC common mainline fork, and another one is in the mailing lists. Picking one of these patches and adding a panel node (and a driver if not supported yet) should be all that's needed to bring the display up.
A better starting point however would be to add a simple framebuffer that makes use of the framebuffer setup by the bootloader for continuous splash. This also allows getting some kernel output on the display earlier in the boot process. You can find the memory address of this framebuffer in a reserved memory node named cont_splash_mem
or similar in downstream dts.
USB
Enabling usb3
or usb2
depending on which one the USB port is connected to should be enough to make USB work, although forcing it to peripheral mode might be needed before adding support for extcon:
MSM8996 USB peripheral mode configuration
&usb3 { ... dwc3@6a00000 { dr_mode = "peripheral"; ... }; };
Some devices have a USB 2.0 port wired to usb3
. In this case it must be limited to high-speed and have usb3phy
removed from it:
MSM8996 USB 2.0 configuration
&usb3 { /* Disable USB3 pipe_clk requirement */ qcom,select-utmi-as-pipe-clk; ... dwc3@6a00000 { /* usb3-phy is not used on this device */ phys = <&hsusb_phy1>; phy-names = "usb2-phy"; /* Limit USB to high-speed */ maximum-speed = "high-speed"; ... }; };
Haptics
Haptics are supported, see Haptics for more details.
See also
- msm8996-mainline a common near-mainline kernel tree for MSM8996 devices. Currently supports OnePlus 3/3T, Xiaomi Mi Note 2, and (partially?) the ZTE Axon 7.
- Xiaomi_Mi_Note_2_(xiaomi-scorpio)#Mainline
Who's working on it
- User:Tooniis (@tooniis on Matrix)
Please add yourself if you're working on MSM8996 mainlining! |