From 9a4b5e36ce58febdd2039dd4d129ee7edf4f5536 Mon Sep 17 00:00:00 2001 From: Niilo Minkkinen Date: Mon, 18 May 2009 17:54:16 +0300 Subject: [PATCH] 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 Signed-off-by: Richard Woodruff Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/omap2430.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c index 48930f25c45..34875201ee0 100644 --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -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); -- 2.39.2