Qualcomm Snapdragon 660/630/636 (SDM660/SDM630/SDM636)

Qualcomm SDM660
	; Qualcomm SDM660 in ceramic package
Manufacturer	Qualcomm
Name	SDM660
Codenames	msmfalcon/apqfalcon
Architecture	aarch64
CPU	4x 2.2 GHz Kryo 260 Gold, 4x 1.84 GHz Kryo 260 Silver
GPU	Adreno 512
Year	2017
Process	14nm
Mainline	yes
Community Page	https://github.com/sdm660-mainline
Components
CPU	Partial
UART	Works
Storage	Works
USB	Partial
Display	Works
GPU	Partial
Pinctrl	Works
I²C	Works
SPI	Works
Audio	Broken
Video	Works
Thermal	Works
WiFi	Works
Bluetooth	Works
Modem	Works
GPS
Camera	Partial
Suspend
Ethernet

Qualcomm SDM636
	; Qualcomm SDM636 in ceramic package
Manufacturer	Qualcomm
Name	SDM636
Architecture	aarch64
CPU	4x Kryo 260 Gold PERF cluster + 4x Kryo 260 Silver PWR cluster
GPU	Adreno 509
Year	2017
Process	14nm
Mainline	yes
Community Page	https://github.com/sdm660-mainline
Components
CPU	Partial
UART	Works
Storage	Works
USB	Partial
Display	Works
GPU	Partial
Pinctrl	Works
I²C	Works
SPI	Works
Audio	Broken
Video	Works
Thermal	Works
WiFi	Works
Bluetooth	Works
Modem	Works
GPS
Camera	Partial
Suspend
Ethernet

Qualcomm SDM630
	; Qualcomm SDM630 in ceramic package
Manufacturer	Qualcomm
Name	SDM630
Codenames	msmtriton/apqtriton
Architecture	aarch64
CPU	4x Cortex-A53 PERF cluster + 4x Cortex-A53 PWR cluster
GPU	Adreno 508
Year	2017
Process	14nm
Mainline	yes
Community Page	https://github.com/sdm660-mainline
Components
CPU	Partial
UART	Works
Storage	Works
USB	Partial
Display	Works
GPU	Partial
Pinctrl	Works
I²C	Works
SPI	Works
Audio	Broken
Video	Works
Thermal	Works
WiFi	Works
Bluetooth	Works
Modem	Works
GPS
Camera	Partial
Suspend
Ethernet

General description

SDM660/636/630 are Qualcomm SoCs released in 2017, with mostly out-of-tree mainline support.

According to Wikipedia, they all are pretty similar. Their advantage is price; these SoCs are usually used in middle-range devices.

Closest similar SoC is MSM8998 Snapdragon 835 (which has decent mainline support), and it seems that several drivers from MSM8998 can be reused for SDM660.

Devices

SDM660 (Snapdragon 660)

Device	Codename	Mainline
Asus Zenfone 4	asus-z01k
HMD Global Nokia 7.2	nokia-daredevil
Samsung Galaxy A9 2018 (A920F)	samsung-a9y18qlte
Xiaomi Mi 8 Lite	xiaomi-platina	P
Xiaomi Mi A2	xiaomi-jasmine_sprout	Y
Xiaomi Mi Note 3	xiaomi-jason
Xiaomi Mi Pad 4	xiaomi-clover	Y
Xiaomi Redmi Note 7	xiaomi-lavender	Y

SDM636 (Snapdragon 636)

Device	Codename	Mainline
Asus Zenfone Max Pro M1	asus-x00td	Y
HMD Global Nokia 6.1 Plus	nokia-DRG
Sony Xperia 10 Plus	sony-mermaid	Y
Xiaomi Mi Max 3	xiaomi-nitrogen
Xiaomi Redmi Note 5 Pro	xiaomi-whyred
Xiaomi Redmi Note 6 Pro	xiaomi-tulip	Y

SDM630 (Snapdragon 630)

Device	Codename	Mainline
HMD Global Nokia 6.1	nokia-PL2	P
Motorola Moto X4	motorola-payton
Sony Xperia 10	sony-kirin	Y
Sony Xperia XA2	sony-pioneer	Y
Sony Xperia XA2 Plus	sony-voyager	Y
Sony Xperia XA2 Ultra	sony-discovery	Y

Battery/Charging

Most devices seem to use the PMIC-provided QPNP-charger which currently does not have a mainline driver.

CPU

All cores are up, PSCI is working. Marked as partial because there is no support for CPU frequency scaling. It is advised to use only 4 CPUs for now due to the lack of cluster interconnect scaling, which results in 8 cores being slower than 4.

Display

At least four 630 boards can successfully use display (both command- and video-mode) via DRM/MSM (and of course CPU rendering) with some (for now) out-of-tree patches. Most devices make use of PMIC-provided WLED backlight, which does have a mainline driver, but there happens to be an issue with it not working.

GPU

Adreno 508/509/512 are not supported in the mainline kernel yet.

There are patches sent to upstream for enabling support for those GPUs. See kholk commits to upstream for more info

Modem Subsystem

The remote processor responsible for modem subsystem shows up and shows *some* signs of life, but neither the modem itself, nor the Wi-Fi chip currently work. The phone also gets very hot with it enabled, which might suggest it's not really fine right now. Of course it needs firmware.

Pinctrl

Was ported from downstream kernel to mainline by opendata in 2018.

SMMUs / IOMMUs

This platform is very picky about its SMMUs and therefore requires many downstream workarounds to be implemented. Upstream maintainers aren't exactly happy with that.

https://patchwork.kernel.org/project/linux-arm-msm/list/?series=355881&archive=both

Storage

At least SDHCI (eMMC) was tested to work. UFS is untested (if anybody knows about a sdm630/36/60-based device using UFS, leave a note here!).

USB

There is WIP support for USB 2.0 only (no USB 3) by Konrad Dybcio in https://github.com/konradybcio/linux/commits/ninges_labs

Do note that most devices only have USB 2.0 wired up in hardware.

WiFi

Wireless network should be available via the ath10k_snoc driver, provided the modem subsystem is alive. It also needs firmware (which is possibly signed per-device or per-vendor - though it's unconfirmed!).

Work done so far

Who is working on it

User:opendata worked on initial basic SoC support (pinctrl-sdm660, gcc-sdm660) (+ various branches)
Pavel Dubrova worked on SDM630 SoC support based on kernel 5.3. It is unknown where the sources are located.
User:Alexeymin tried to continue opendata's work. WIP Branch is in linux-postmarketos repo.
Konrad Dybcio in https://github.com/konradybcio/linux/commits/ninges_labs (warning: frequent forcepushes!)
SoMainline on GitHub: https://github.com/SoMainline/linux/