Purism and Linux 5.17

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Martin Kepplinger

Latest posts by Martin Kepplinger (see all)

• Purism and Linux 6.2 to 6.4 - July 13, 2023
• Update for the Librem 5 Support in Mainline Linux - March 7, 2023
• Purism and Linux 5.19 to 6.1 - December 23, 2022

Following up on our report for Linux 5.16 this summarizes the progress on mainline support for the Librem 5 phone and its development kit during the 5.17 development cycle. This summary is only about code flowing upstream.

Librem 5 selfie cam

This time around, not too much code was flowing upstream, but some important code did. After a cleanup patch for the media device driver and new fixes for the selfie cam sensor driver, we added the devicetree description for that camera. That means that the following script saves one photo as a raw frame:

#!/bin/bash
WIDTH=1632
HEIGHT=1224
SKIP=10

media-ctl -d "platform:30a90000.csi" --set-v4l2 "'csi':0 [fmt:SGBRG10/${WIDTH}x${HEIGHT} colorspace:raw]"
media-ctl -d "platform:30a90000.csi" --set-v4l2 "'imx8mq-mipi-csi2 30a70000.csi':0 [fmt:SGBRG10/${WIDTH}x${HEIGHT} colorspace:raw]"
media-ctl -d "platform:30a90000.csi" --set-v4l2 "'hi846 2-0020':0 [fmt:SGBRG10/${WIDTH}x${HEIGHT} colorspace:raw]"
media-ctl -d "platform:30a90000.csi" -l "'hi846 2-0020':0 -> 'imx8mq-mipi-csi2 30a70000.csi':0 [1]"
v4l2-ctl -d "/dev/v4l/by-path/platform-30a90000.csi-video-index0" --set-fmt-video=width=${WIDTH},height=${HEIGHT},pixelformat=GB16 --stream-mmap --stream-to=$WIDTH.raw --stream-skip=$SKIP --stream-count=1

Of course we’ll continue to maintain this but in large parts this concludes the journey of supporting a camera in mainline Linux.

• media: imx: Remove unused functions
• arm64: dts: imx8mq-librem5: fix mipi_csi1 port number to sensor
• arm64: dts: imx8mq: fix mipi_csi bidirectional port numbers
• media: i2c: hi846: use pm_runtime_force_suspend/resume for system suspend
• media: i2c: hi846: check return value of regulator_bulk_disable()
• arm64: dts: imx8mq-librem5-r3.dtsi: describe selfie cam XSHUTDOWN pin
• arm64: dts: imx8mq-librem5: describe the selfie cam
• arm64: dts: imx8mq-librem5: describe power supply for cameras
• arm64: dts: split out a shared imx8mq-librem5-r3.dtsi description

Charge controller

An addition to the drivers for charging the phone found its way upstream:

• power: bq25890: add POWER_SUPPLY_PROP_TEMP

Code review

During this round we contributed only 2 Reviewed-by: or Tested-by: tags to patches by other authors. This definitely leaves some room for improvement! Again we would like to thank everybody who reviewed our patches and helped us supporting the hardware in mainline Linux – especially Sakari, Shawn and again Laurent for reviewing.

Sources

Have a look at our Linux tree to see what is currently being worked on and tested (or help if you feel like joining the fun).

Purism Products and Availability Chart

	Model	Status	Lead Time
	Librem Key (Made in USA)	In Stock ($59+)	10 business days	Learn More Buy Now
	Librem Mini	In Stock ($799+)	10 business days	Learn More Buy Now
	Librem 5	In Stock ($999+) 3GB/32GB	10 business days	Learn More Buy Now
	Liberty Phone (Made in USA Electronics)	In Stock ($1,999+) 4GB/128GB	10 business days	Learn More Buy Now
	Librem 11	In Stock ($999+) 8GB/1TB	3 business weeks	Learn More Buy Now
	Librem 14	In Stock ($1,370+)	3 business weeks	Learn More Buy Now
	Librem Server	In Stock ($2,999+)	10 business days	Learn More Buy Now