AM3356: USB OTG does not work after sleep&wakeup

Hi Takeharu,

Takeharu Katsuyama said:

But after sleeping and waking-up, it does not work.

Can you please explain what doesn't work?

Hi Liu,

Thank you for your response.

Nothing happens and no message in 'dmesg' at all, when I insert USB-LAN dongle.

Hi Takeharu,

Please try a couple things:

1. remove the sleep pinmux from the device tree;

2. set usb0 dr_mode to "host".

Please try "1" only first, then try "1" + "2" together.

Hi Bin

Thank you for your reply.

> 1. remove the sleep pinmux from the device tree;

No effect.

> 2. set usb0 dr_mode to "host".

Even only "2" is effective also "1"+"2".

So, this means OTG mode after resuming has a problem.

Can you fix this.

Best Regards,

Hi Katsuyama-san,

Please try the following kernel patch:

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 1fea04e65e00..5a6109c69488 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2727,7 +2727,8 @@ static int musb_resume(struct device *dev)
        musb_platform_enable(musb);
 
        /* session might be disabled in suspend */
-       if (musb->port_mode == MUSB_HOST &&
+       if ((musb->port_mode == MUSB_HOST ||
+            musb->xceiv->otg->state == OTG_STATE_A_SUSPEND) &&
            !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
                devctl |= MUSB_DEVCTL_SESSION;
                musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

Hi Bin,

Thank you for your patch.

Sorry to say,  it does not fix that. Nothing is changed.

Regards,

Hi Katsuyama-san,

Thanks for the testing.

Is the issue reproducible on AM335x GPEVM?