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[V3] roles: Fix USB 3.0 OTG issue on Intel platform

Message ID 1536294076-20538-1-git-send-email-saranya.gopal@intel.com (mailing list archive)
State New, archived
Headers show
Series [V3] roles: Fix USB 3.0 OTG issue on Intel platform | expand

Commit Message

Saranya Gopal Sept. 7, 2018, 4:21 a.m. UTC 
From: Saranya Gopal <saranya.gopal@intel.com>

This patch adds static DRD mode for host/device
mode switch. This fixes the issue where device
mode was not working after DUT switches to host
mode with 3.0 OTG connector.

Change-Id: Ib6d04b90d277d965ef10026751a7f4832cad5d2a
Signed-off-by: Saranya Gopal <saranya.gopal@intel.com>
Signed-off-by: M Balaji <m.balaji@intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/usb/roles/intel-xhci-usb-role-switch.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c
index dad2d19..0d1ea82 100644
--- a/drivers/usb/roles/intel-xhci-usb-role-switch.c
+++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c
@@ -25,6 +25,9 @@ 
 #define SW_VBUS_VALID			BIT(24)
 #define SW_IDPIN_EN			BIT(21)
 #define SW_IDPIN			BIT(20)
+#define SW_SWITCH_EN_CFG0		BIT(16)
+#define SW_DRD_STATIC_HOST_CFG0		1
+#define SW_DRD_STATIC_DEV_CFG0		2
 
 #define DUAL_ROLE_CFG1			0x6c
 #define HOST_MODE			BIT(29)
@@ -83,17 +86,22 @@  static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
 	case USB_ROLE_NONE:
 		val |= SW_IDPIN;
 		val &= ~SW_VBUS_VALID;
+		val &= ~(SW_DRD_STATIC_DEV_CFG0 | SW_DRD_STATIC_HOST_CFG0);
 		break;
 	case USB_ROLE_HOST:
 		val &= ~SW_IDPIN;
 		val &= ~SW_VBUS_VALID;
+		val &= ~SW_DRD_STATIC_DEV_CFG0;
+		val |= SW_DRD_STATIC_HOST_CFG0;
 		break;
 	case USB_ROLE_DEVICE:
 		val |= SW_IDPIN;
 		val |= SW_VBUS_VALID;
+		val &= ~SW_DRD_STATIC_HOST_CFG0;
+		val |= SW_DRD_STATIC_DEV_CFG0;
 		break;
 	}
-	val |= SW_IDPIN_EN;
+	val |= SW_IDPIN_EN | SW_SWITCH_EN_CFG0;
 
 	writel(val, data->base + DUAL_ROLE_CFG0);