MUSB peripheral DMA regression caused by driver core runtime PM change

Tony Lindgren tony at
Wed Oct 21 16:41:34 PDT 2015

Hi all,

I noticed a regresssino in v4.3-rc series to day with MUSB gadgets
and DMA. Doing a git bisect between v4.2..v4.3-rc1 on it pointed to:

ddef08dd00f5 ("Driver core: wakeup the parent device before trying probe")

With the commit above reverted things work fine with DMA and USB gadgets.

This is on omap3 with CONFIG_USB_INVENTRA_DMA selected. Selecting
CONFIG_MUSB_PIO_ONLY still works even without reverting ddef08dd00f5.

Anybody got ideas what might be wrong? Some wrong runtime PM usage
under drivers/usb/musb?



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