From 193d7d153024214f2906e34f2c8abd495be57696 Mon Sep 17 00:00:00 2001 From: Paul Kocialkowski Date: Mon, 19 Jan 2015 18:33:43 +0100 Subject: [PATCH] usb: musb-new: omap2430: Reset the MUSB controller early When booting from USB peripheral boot, the bootrom will not properly deinit the MUSB controller, which doesn't clearly indicate an USB disconnection to the host and leaves U-Boot to deal with the state of the previous USB session. On some host controller drivers (e.g. xhci_hcd), this ends up in a failure during set address, caused by the lack of proper disconnection notification. Resetting the controller early in U-Boot notifies the host of the disconnection and doesn't hurt other use cases. Signed-off-by: Paul Kocialkowski Reviewed-by: Tom Rini --- drivers/usb/musb-new/omap2430.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/usb/musb-new/omap2430.c b/drivers/usb/musb-new/omap2430.c index 98f4830912..31a280edba 100644 --- a/drivers/usb/musb-new/omap2430.c +++ b/drivers/usb/musb-new/omap2430.c @@ -321,6 +321,7 @@ static int omap2430_musb_init(struct musb *musb) { u32 l; int status = 0; + unsigned long int start; #ifndef __UBOOT__ struct device *dev = musb->controller; struct omap2430_glue *glue = dev_get_drvdata(dev->parent); @@ -331,6 +332,21 @@ static int omap2430_musb_init(struct musb *musb) (struct omap_musb_board_data *)musb->controller; #endif + /* Reset the controller */ + musb_writel(musb->mregs, OTG_SYSCONFIG, SOFTRST); + + start = get_timer(0); + + while (1) { + l = musb_readl(musb->mregs, OTG_SYSCONFIG); + if ((l & SOFTRST) == 0) + break; + + if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) { + dev_err(musb->controller, "MUSB reset is taking too long\n"); + return -ENODEV; + } + } #ifndef __UBOOT__ /* We require some kind of external transceiver, hooked -- 2.39.5