Broken AUTOIDLE on OMAP 3430 forces extra manipulation to enable
correctly OFF-mode.
based-on: Heikki Krogerus <ext-heikki.krogerus@xxxxxxxxx>
Signed-off-by: Arnaud Mandy <ext-arnaud.2.mandy@xxxxxxxxx>
---
drivers/usb/musb/omap2430.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 45c564a..b1843de 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -277,9 +277,22 @@ void musb_platform_restore_context(struct musb *musb,
void musb_power_off_controller(struct musb *musb)
{
u32 l;
+ unsigned long tmo;
DBG(3, "allow OFF-mode\n");
+ if (cpu_is_omap3430()) {
+ /* Do soft reset. This needs to be done with broken AUTOIDLE */
+ tmo = jiffies + msecs_to_jiffies(300);
+ musb_writel(musb->mregs, OTG_SYSCONFIG, SOFTRST);
+ while (!musb_readl(musb->mregs, OTG_SYSSTATUS)) {
+ if (time_after(jiffies, tmo)) {
+ WARN(1, "musb failed to recover from reset!");
+ break;
+ }
+ }
+ }
+
l = musb_readl(musb->mregs, OTG_FORCESTDBY);
l |= ENABLEFORCE; /* enable MSTANDBY */
musb_writel(musb->mregs, OTG_FORCESTDBY, l);
@@ -293,6 +306,12 @@ void musb_power_off_controller(struct musb *musb)
l &= ~NOIDLE; /* disable noidle */
l |= SMARTIDLE; /* enable smart idle */
musb_writel(musb->mregs, OTG_SYSCONFIG, l);
+
+ if (cpu_is_omap3430()) {
+ /* Now it's safe to get rid of the buggy AUTOIDLE */
+ l &= ~AUTOIDLE;
+ musb_writel(musb->mregs, OTG_SYSCONFIG, l);
+ }
}
EXPORT_SYMBOL_GPL(musb_power_off_controller);
--
1.6.0.4
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