USB Overcurrent Detection process for MX6Q-SABRE-SD with AndroidKK4.4.3

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USB Overcurrent Detection process for MX6Q-SABRE-SD with AndroidKK4.4.3

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yuuki
Contributor V

Dear all,

We evaluate AndroidKK4.4.3 on SABRE-SDB.

When Overcurrent is detected on a USB port, what kind of processing is executed?

May I have advice?

Best Regards,
Yuuki

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Yuuki

if "disable-over-current" is enabled in dtsi file

linux/imx6qdl-sabresd.dtsi at master · torvalds/linux · GitHub

USB module performs processing described in sect.

65.4.3.2.5 Port Reporting Over-Current and Table 65-37

i.MX6DQ Reference Manual (rev.3  7/2015)

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

Details of driver behaviour one can find looking at usb driver sources

in attached Linux Manual Table 41-1 USB Driver Files.

On SABRE-SDB MIC2026 (U515 in sabre schematic spf-27392.pdf) limits current at

overcurrent condition.

Best regards

igor

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