commit 05debd5700dd009a493ad4a55e5be5556d5a0b7b
author Matthias Kaehlcke <mka@google.com> Tue Jan 05 11:21:19 2016 -0800
committer Matthias Kaehlcke <mka@google.com> Wed Jan 06 09:59:06 2016 -0800
tree 8c71870173c1874e777d74dd091f7de4121f80ed
parent 185cbe3b3a38f9cfcb22678146544558f1025601

dwc_otg: use GUSBCFG to force host/device mode

Google-Bug-Id: 26390815

Change-Id: If9a50a6478bec8458fc1b3bf58aad8184ec90b91

drivers/usb/dwc_otg/dwc_otg_cil.c

diff --git a/drivers/usb/dwc_otg/dwc_otg_cil.c b/drivers/usb/dwc_otg/dwc_otg_cil.c
index b5de301..0ea097f 100644
--- a/drivers/usb/dwc_otg/dwc_otg_cil.c
+++ b/drivers/usb/dwc_otg/dwc_otg_cil.c
@@ -1206,11 +1206,13 @@
 	gahbcfg_data_t ahbcfg = {.d32 = 0 };
 	gusbcfg_data_t usbcfg = {.d32 = 0 };
 	gi2cctl_data_t i2cctl = {.d32 = 0 };
+	gusbcfg_data_t usbcfg_prev;
 
 	DWC_DEBUGPL(DBG_CILV, "dwc_otg_core_init(%p)\n", core_if);
 
 	/* Common Initialization */
 	usbcfg.d32 = DWC_READ_REG32(&global_regs->gusbcfg);
+	usbcfg_prev.d32 = usbcfg.d32;
 
 	/* Program the ULPI External VBUS bit if needed */
 	usbcfg.b.ulpi_ext_vbus_drv =
@@ -1465,8 +1467,22 @@
 		break;
 	}
 
+#if defined(CONFIG_DWC_OTG_HOST_ONLY)
+	usbcfg.b.force_dev_mode = 0;
+	usbcfg.b.force_host_mode = 1;
+#elif defined(CONFIG_DWC_OTG_DEVICE_ONLY)
+	usbcfg.b.force_dev_mode = 1;
+	usbcfg.b.force_host_mode = 0;
+#endif
+
 	DWC_WRITE_REG32(&global_regs->gusbcfg, usbcfg.d32);
 
+	if ((usbcfg.b.force_dev_mode != usbcfg_prev.b.force_dev_mode) ||
+		(usbcfg.b.force_host_mode != usbcfg_prev.b.force_host_mode)) {
+		/* wait for mode change to become effective */
+		dwc_mdelay(25);
+	}
+
 #ifdef CONFIG_USB_DWC_OTG_LPM
 	if (core_if->core_params->lpm_enable) {
 		glpmcfg_data_t lpmcfg = {.d32 = 0 };