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Message-Id: <1398329653-29968-1-git-send-email-fercerpav@gmail.com> Date: Thu, 24 Apr 2014 12:54:13 +0400 From: Paul Fertser <fercerpav@...il.com> To: Li Yang <leoli@...escale.com>, Felipe Balbi <balbi@...com> Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, Paul Fertser <fercerpav@...il.com> Subject: [PATCH] usb: gadget: fsl: check vbus presence on probe If VBUS is already present during the driver initialisation, the corresponding IRQ never fires, so there is no way the gadget can get enumerated. This patch is real-life tested on an i.MX25 board with VBUS constantly hooked up. Signed-off-by: Paul Fertser <fercerpav@...il.com> --- drivers/usb/gadget/fsl_udc_core.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/gadget/fsl_udc_core.c b/drivers/usb/gadget/fsl_udc_core.c index a2f26cd..b4b1516 100644 --- a/drivers/usb/gadget/fsl_udc_core.c +++ b/drivers/usb/gadget/fsl_udc_core.c @@ -2501,6 +2501,11 @@ static int __init fsl_udc_probe(struct platform_device *pdev) if (ret) goto err_del_udc; + /* Now let it settle a bit and sense VBUS */ + msleep_interruptible(1); + if (fsl_readl(&dr_regs->otgsc) & OTGSC_STS_B_SESSION_VALID) + udc_controller->vbus_active = 1; + create_proc_file(); return 0; -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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