imx6q governor: performance and powersave - USB support

[aleksmish]

We have a board, similar to the SabreLite.

If the kernel configuration with powersave governor and USB support (ECHI 2.0 hub) then board is loaded, but does not work at temperatures below 5 degrees Celsius.

If the kernel configuration with performance governor and USB support (ECHI 2.0 hub) then board is not loaded. loading stops after initialization DVFS and before or during the initialization of USB and then nothing happens with the board.

If the kernel configuration with performance governor and without USB support (ECHI 2.0 hub) then board is loaded and stably operates at a temperature below -30 degrees Celsius, but does not work USB bus. we need a USB bus.

[Yuri]

  Please check Your design, using recommendations of Design Checklist in Chapter 2 (Design
Checklist), Chapter 3 (i.MX 6 Series Layout Recommendations) and Chapter 8 (Avoiding Board
Bring-up Problems) of "Hardware Development Guide for i.MX 6Quad,6Dual, 6DualLite, 6Solo
Families". Please pay attention on USB considerations.

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

  Also, please try to test memory (under low temperature), using the Stress test.

“i.MX6 DDR Stress Test Tool V1.0.3”

https://community.freescale.com/docs/DOC-96412

DDR3 Porting Guide also may be useful for DDR Test Tool operations.

https://community.freescale.com/docs/DOC-101708

Have a great day,
Yuri

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[aleksmish]

Yuri Muhin написал(а):

  Please check Your design, using recommendations of Design Checklist in Chapter 2 (Design
Checklist), Chapter 3 (i.MX 6 Series Layout Recommendations) and Chapter 8 (Avoiding Board
Bring-up Problems) of "Hardware Development Guide for i.MX 6Quad,6Dual, 6DualLite, 6Solo
Families". Please pay attention on USB considerations.

These recommendations are made, everything matches.

Test memory (under low temperature) is good. DDR3 is calibrated.