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>

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 48930f25c45069a6ca35a365d61179ac012d6474..34875201ee041220c715a9df268840b026009696 100644 (file)
--- 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);