Purism and Linux 5.11

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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

Following up on our report for Linux 5.9 and 5.10, this summarizes the progress on mainline support for the Librem 5 phone and its development kit during the 5.11 development cycle.

Librem 5 and Devkit updates

In order to maintain support for the devkit and the phone, we continuously update the mainline default configuration:

• arm64: defconfig: Enable more Librem 5 hardware

Power management

The mainline solution to dynamically scale internal bus frequencies relies on the interconnect (and devfreq) framework. We found a small piece that has been missing for imx8mq:

• interconnect: imx8mq: Use icc_sync_state

Librem 5 LCD panel

The display panel driver saw some minor updates:

• dt-binding: display: Require two resets on mantix panel
• drm/panel: mantix: Fix panel reset
• drm/panel: mantix: Don’t dereference NULL mode

Librem 5 fuel gauge

With the experience with using the phone for the last couple of months, we could improve the battery fuel gauge driver a bit:

• power: supply: max17042_battery: Export charge termination current property
• power: supply: max17042_battery: Take r_sns value into account in charge_counter
• power: supply: max17042_battery: Improve accuracy of current_now and current_avg readings
• power: supply: max17042_battery: Fix current_avg,now hiding with no current sense
• power: supply: bq25890: Use the correct range for IILIM register

Librem 5 USB Type-C and PD controller

Our work to make sure we can properly charge the phone and use its Type-C feature like Displayport resulted in the following additions during this development period:

• usb: typec: tps6598x: Export some power supply properties
• usb: typec: tps6598x: Select USB_ROLE_SWITCH and REGMAP_I2C

Other additions and fixes

Equally important are the changes to a regulator device that allow one to turn off the GPU regulator, to the mxsfb display driver and to the etnaviv GPU driver. Read the commit messages for more details.

• regulator: bd718x7: Add enable times
• drm: mxsfb: Silence -EPROBE_DEFER while waiting for bridge
• drm/etnaviv: Add lockdep annotations for context lock

Code review

During these rounds, we contributed 6 Reviewed-by: or Tested-by: tags to patches by other authors. We would also like to thank everybody who reviewed our patches and helped us support the hardware in mainline Linux.

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).

Discover the Librem 5

Purism believes building the Librem 5 is just one step on the road to launching a digital rights movement, where we—the-people stand up for our digital rights, where we place the control of your data and your family’s data back where it belongs: in your own hands.

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