Commit 7e1704dc authored by Tony Lindgren's avatar Tony Lindgren Committed by Greg Kroah-Hartman

usb: musb: Fix idling after host mode by increasing autosuspend delay

Looks like at least 2430 glue won't idle reliably with the 200 ms
autosuspend delay. This causes deeper idle states being blocked for
the whole SoC when disconnecting OTG A cable.

Increasing the delay to 500 ms seems to idle both MUSB and the PHY
reliably. This is probably because of time needed by the hardware
based negotiation between MUSB and the PHY.
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarBin Liu <b-liu@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a60d541a
...@@ -2028,9 +2028,15 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) ...@@ -2028,9 +2028,15 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
musb_readl = musb_default_readl; musb_readl = musb_default_readl;
musb_writel = musb_default_writel; musb_writel = musb_default_writel;
/* We need musb_read/write functions initialized for PM */ /*
* We need musb_read/write functions initialized for PM.
* Note that at least 2430 glue needs autosuspend delay
* somewhere above 300 ms for the hardware to idle properly
* after disconnecting the cable in host mode. Let's use
* 500 ms for some margin.
*/
pm_runtime_use_autosuspend(musb->controller); pm_runtime_use_autosuspend(musb->controller);
pm_runtime_set_autosuspend_delay(musb->controller, 200); pm_runtime_set_autosuspend_delay(musb->controller, 500);
pm_runtime_enable(musb->controller); pm_runtime_enable(musb->controller);
/* The musb_platform_init() call: /* The musb_platform_init() call:
......
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