Purism and Linux 6.2 to 6.4

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Martin Kepplinger

Latest posts by Martin Kepplinger (see all)

• PureOS Unaffected by ext4 Data Corruption Bug - January 2, 2024
• Purism and Linux 6.5 to 6.7 - December 22, 2023
• Purism and Linux 6.2 to 6.4 - July 13, 2023

It’s time to report on code flowing upstream again: Following up on our report for Linux 5.19, 6.0 and 6.1 this summarizes the progress on mainline support for the Librem 5 phone and its development kit during the 6.2, 6.3 and 6.4 development cycles.

Librem 5 hardware description updates

It’s crucial to describe our boards correctly and we constantly improve that description based on specifications, driver code and the hardware. During the last weeks and months we’ve improved power consumption and completed selfie-camera support among other things:

• arm64: dts: imx8mq: Add UART DMA support
• arm64: dts: imx8mq-librem5: Add 166MHz to DDRC OPP table
• arm64: dts: imx8mq-librem5: Reduce I2C frequency to 384kHz
• arm64: dts: imx8mq-librem5: Bump BUCK1 suspend voltage to 0.81V
• arm64: dts: imx8mq-librem5: Remove dis_u3_susphy_quirk from usb_dwc3_0
• arm64: dts: imx8mq-librem5: Adjust proximity sensor’s near levels
• arm64: dts: imx8mq-librem5: Bump usdhc2 frequency to 100MHz
• arm64: dts: imx8mq-librem5: Set the DVS voltages lower
• arm64: dts: imx8mq-librem5: Set charger parameters for each batch
• arm64: dts: imx8mq-librem5: Describe MIC_2V4 regulator
• arm64: dts: imx8mq-librem5: add the magnetometer mount matrix
• arm64: dts: imx8mq-librem5: add brightness levels to led-backlight
• arm64: dts: imx8mq-librem5: fix audio-1v8 regulator name
• arm64: dts: imx8mq-librem5: describe the clock for the csi sensors
• arm64: dts: imx8mq-librem5: lower the mipi csi 1 frequencies
• arm64: dts: imx8mq-librem5: use multicolor leds description for RGB led

BroadMobi Modem driver update

We improved the serial communication with the BM818 modem:

• net: usb: qmi_wwan: Set DTR quirk for BroadMobi BM818

MIPI CSI2 camera receiver updates

We’ve written a driver for the i.MX8MQ MIPI CSI2 camera receiver controller and included it in mainline Linux. We continue to support it and optimized it a bit:

• media: imx: imx8mq-mipi-csi2: Remove unneeded state variable and function
• media: imx: imx8mq-mipi-csi2: Use V4L2 subdev active state

Documentation updates

Documentation is always underevaluated. During working on camera, we improved Linux documentation a bit:

• media: media api: Try to make enum usage clearer
• media: doc/media api: Try to make enum usage clearer

Code review

During this period we contributed 12 Reviewed-by: or Tested-by: tags to patches by other authors. Again we would like to thank everybody who reviewed our patches and helped us supporting the hardware in mainline Linux – especially Shawn for the DT review.

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. The debian/README.source document describes our workflow.

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 5	In Stock ($699+) 3GB/32GB	10 business days	Learn More Buy Now
	Librem 5 COMSEC Bundle	In Stock ($1299+) Qty 2; 3GB/32GB	10 business days	Learn More Buy Now
	Liberty Phone (Made in USA Electronics)	Backorder ($1,999+) 4GB/128GB	Estimated fulfillment February	Learn More Buy Now
	Librem 5 + SIMple (3 GB Data)	In Stock ($99/mo)	10 business days	Learn More Buy Now
	Librem 5 + SIMple Plus (5 GB Data)	In Stock ($129/mo)	10 business days	Learn More Buy Now
	Librem 5 + AweSIM (Unlimited Data)	In Stock ($169/mo)	10 business days	Learn More Buy Now
	Librem 11	In Stock ($999+) 8GB/1TB	10 business days	Learn More Buy Now
	Librem 14	Backorder ($1,370+)	Estimated fulfillment December	Learn More Buy Now
	Librem Mini	Backorder ($799+)	10 business days	Learn More Buy Now
	Librem Server	In Stock ($2,999+)	45 business days	Learn More Buy Now