Commit 9a4b5e36 authored May 18, 2009 by Niilo Minkkinen Committed by Greg Kroah-Hartman Jun 15, 2009

usb: musb: disable OTG AUTOIDLE only with omap3430



Omap3 MUSB AUTOIDLE functionality configured through OTG_SYSCONFIG
register prevents the device from going into retention.
This is a workaround (by Richard Woodruff/TI), as his comment :
> A new MUSB bug which is a match to data below was identified very
> recently (on hardware and in simulation).
> This bug is in 3430 and not 3630.
> As a priority test (and as new default) you should have engineers
> disable autoidle for MUSB block.
> This is the workaround which will show up in next errata.

Signed-off-by: Niilo Minkkinen <ext-niilo.1.minkkinen@nokia.com>
Signed-off-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent a2bfb4a3

drivers/usb/musb/omap2430.c

+6 −1

Original line number	Original line	Diff line number	Diff line
	@@ -227,6 +227,11 @@ int __init musb_platform_init(struct musb *musb)
	l &= ~AUTOIDLE; /* disable auto idle */		l &= ~AUTOIDLE; /* disable auto idle */
	l &= ~NOIDLE; /* remove possible noidle */		l &= ~NOIDLE; /* remove possible noidle */
	l \|= SMARTIDLE; /* enable smart idle */		l \|= SMARTIDLE; /* enable smart idle */
			/*
			* MUSB AUTOIDLE don't work in 3430.
			* Workaround by Richard Woodruff/TI
			*/
			if (!cpu_is_omap3430())
	l \|= AUTOIDLE; /* enable auto idle */		l \|= AUTOIDLE; /* enable auto idle */
	omap_writel(l, OTG_SYSCONFIG);		omap_writel(l, OTG_SYSCONFIG);