From 1b7a66b4d3399da5e0b13cf90fb4bd33b7197ff2 Mon Sep 17 00:00:00 2001 From: Gregory Herrero Date: Fri, 9 Jan 2015 13:39:09 +0100 Subject: [PATCH] usb: dwc2: gadget: force gadget initialization in dev mode When booting with id pin grounded, dwc2 default to host mode. Thus, force device mode prior initializing gadget part. Else fifo init will fail since fifo values are not correct in host mode. Tested-by: Robert Baldyga Acked-by: Paul Zimmerman Signed-off-by: Gregory Herrero Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/gadget.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index f47770940a7a..df9080d20606 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -3675,6 +3675,19 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq) /* usb phy enable */ s3c_hsotg_phy_enable(hsotg); + /* + * Force Device mode before initialization. + * This allows correctly configuring fifo for device mode. + */ + __bic32(hsotg->regs + GUSBCFG, GUSBCFG_FORCEHOSTMODE); + __orr32(hsotg->regs + GUSBCFG, GUSBCFG_FORCEDEVMODE); + + /* + * According to Synopsys databook, this sleep is needed for the force + * device mode to take effect. + */ + msleep(25); + s3c_hsotg_corereset(hsotg); ret = s3c_hsotg_hw_cfg(hsotg); if (ret) { @@ -3684,6 +3697,9 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq) s3c_hsotg_init(hsotg); + /* Switch back to default configuration */ + __bic32(hsotg->regs + GUSBCFG, GUSBCFG_FORCEDEVMODE); + hsotg->ctrl_buff = devm_kzalloc(hsotg->dev, DWC2_CTRL_BUFF_SIZE, GFP_KERNEL); if (!hsotg->ctrl_buff) { -- 2.20.1