Re: [PATCH 0/4] musb fixes for v4.9-rc cycle

[Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>]

Hi Tony,

On Thursday 10 Nov 2016 22:29:34 Laurent Pinchart wrote:
> On Thursday 10 Nov 2016 10:50:33 Tony Lindgren wrote:
> > * Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org> [161110 10:18]:
> > > I'll try to give it a go, but right now I'm stuck with a different MUSB
> > > problem :-) I'm trying to boot my panda board over the SMSC95xx
> > > ethernet, and have switched gadget support from being compiled in to
> > > being compiled as a module. I then get
> > > 
> > > [    2.766174] musb_bus_suspend 2586: trying to suspend as a_idle while
> > > active
> > > 
> > > printed in a loop at boot time. I've traced musb->is_active being set to
> > > 1 in musb_start() with
> > > 
> > > musb->port_mode = MUSB_PORT_MODE_DUAL_ROLE
> > > musb->xceiv->otg->state = OTG_STATE_A_IDLE
> > > devctl = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_VBUS
> > > 
> > > I can disable gadget support completely which will I believe fix the
> > > problem, but that's just a workaround. Help would be appreciated.
> > 
> > Do you have the ID pin grounded
> 
> I've measured it on the board and I don't. Booting with the USB cable
> unplugged and the board powered through the power jack gives the same
> result.
> > or how do you get to the A_IDLE state?
> 
> Don't ask me :-)
> 
> > I'm pretty much only testing with loadable modules as in
> > omap2plus_defconfig, I don't think I've seen this issue..
> > 
> > Maybe check the changes in your .config against just plain
> > omap2plus_defconfig? Are you trying to force host only mode?
> 
> I started anew from omap2plus_defconfig and applied the following changes to
> enable NFS root.
> 
> -CONFIG_USB_NET_DRIVERS=m
> -CONFIG_USB_USBNET=m
> -CONFIG_USB_NET_SMSC95XX=m
> -CONFIG_USB=m
> -CONFIG_USB_EHCI_HCD=m
> -CONFIG_USB_EHCI_HCD_OMAP=m
> -CONFIG_NOP_USB_XCEIV=m
> -CONFIG_USB_GADGET=m
> -CONFIG_OMAP_USB2=m
> +CONFIG_USB_NET_DRIVERS=y
> +CONFIG_USB_USBNET=y
> +CONFIG_USB_NET_SMSC95XX=y
> +CONFIG_USB=y
> +CONFIG_USB_EHCI_HCD=y
> +CONFIG_USB_EHCI_HCD_OMAP=y
> +CONFIG_NOP_USB_XCEIV=y
> +# CONFIG_USB_GADGET is not set
> +CONFIG_OMAP_USB2=y
> 
> I had to disable CONFIG_USB_GADGET is compiling it as a module prevents
> selecting CONFIG_NOP_USB_XCEIV=y, which is a dependency for
> CONFIG_USB_EHCI_HCD_OMAP=m.
> 
> The new configuration resulted in a few changes, among which the most
> notable is
> 
> -# CONFIG_USB_MUSB_HOST is not set
> -# CONFIG_USB_MUSB_GADGET is not set
> -CONFIG_USB_MUSB_DUAL_ROLE=y
> +CONFIG_USB_MUSB_HOST=y
> 
> I then get the same error as originally reported.

Actually disabling CONFIG_USB_MUSB_HDRC gets rid of the problem, quite 
understandably. It's not a fix though, just a workaround. Are you interested 
in investigating this ?

-- 
Regards,

Laurent Pinchart

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