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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>
This commit is contained in:
Niilo Minkkinen 2009-05-18 17:54:16 +03:00 committed by Greg Kroah-Hartman
parent a2bfb4a346
commit 9a4b5e36ce
1 changed files with 6 additions and 1 deletions
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7
drivers/usb/musb/omap2430.c
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@ -227,7 +227,12 @@ int __init musb_platform_init(struct musb *musb)
l &= ~AUTOIDLE; /* disable auto idle */
l &= ~NOIDLE; /* remove possible noidle */
l |= SMARTIDLE; /* enable smart idle */
l |= AUTOIDLE; /* enable auto idle */
/*
* MUSB AUTOIDLE don't work in 3430.
* Workaround by Richard Woodruff/TI
*/
if (!cpu_is_omap3430())
l |= AUTOIDLE; /* enable auto idle */
omap_writel(l, OTG_SYSCONFIG);
l = omap_readl(OTG_INTERFSEL);