[PATCH 05/25] usb: musb: omap2430: Wait on enable to avoid babble

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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




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