[BUG] Dual Z and EDGE_STEPPING makes first Z rattle and miss steps

[Sanguium]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

When activating a second Z driver and EDGE_STEPPING, the first Z motor grinds and loses steps, while the second works fine.
All other axis work fine, problem goes away when disabling the Z2 driver OR disabling EDGE_STEPPING.

This is the M122 report after moving Z 10m up with and without EDGE_STEPPING enabled:
EDGE_STEPPING OFF:

EDGE_STEPPING ON:

Using SKR v1.3 with TMC2009 drivers

Bug Timeline

Tested wrong in 2.1.2.4 and current bugfix-2.1.x

Expected behavior

Dual Z drivers work fine with the recomended EDGE_STEPPING for trinamic drivers

Actual behavior

First Z motor rattles and loses steps

Steps to Reproduce

1. Set Z_DRIVER_TYPE TMC2209 and Z2_DRIVER_TYPE TMC2209
2. Set EDGE_STEPPING
3. Move Z axis

Version of Marlin Firmware

Commit 0ec1a54

Printer model

Custom cartesian

Electronics

SKR v1.3 board with TMC2209 drivers

LCD/Controller

BIGTREE_TFT24_V1_1

Other add-ons

No response

Bed Leveling

None

Your Slicer

None

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Config.zip

[anomalchik]

Same issue with mks sgen l v1
I use tmc2226 and they also use the driver type TMC2209

[anomalchik]

If you disconnect the first motor but do not remove the driver, the second motor remains in the brake mode or something like that. Also, the second motor works properly if you remove the Z1 driver.