From: Tony Lindgren <tony@xxxxxxxxxxx> We can get babble interrupt if we attempt to switch to USB host mode too soon after enabling musb. Let's fix the issue by waiting a bit in runtime_resume. Cc: Jacopo Mondi <jacopo@xxxxxxxxxx> Cc: Marcel Partap <mpartap@xxxxxxx> Cc: Merlijn Wajer <merlijn@xxxxxxxxxx> Cc: Michael Scott <hashcode0f@xxxxxxxxx> Cc: NeKit <nekit1000@xxxxxxxxx> Cc: Pavel Machek <pavel@xxxxxx> Cc: Sebastian Reichel <sre@xxxxxxxxxx> Acked-by: Pavel Machek <pavel@xxxxxx> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> Signed-off-by: Bin Liu <b-liu@xxxxxx> --- drivers/usb/musb/omap2430.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c index 5c93226e0e20..920862c3fc64 100644 --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -550,6 +550,9 @@ static int omap2430_runtime_resume(struct device *dev) musb_writel(musb->mregs, OTG_INTERFSEL, musb->context.otg_interfsel); + /* Wait for musb to get oriented. Otherwise we can get babble */ + usleep_range(200000, 250000); + return 0; } -- 2.17.1
