In platforms like Cherrytrail, 'SW switch enable' bit
should not be enabled for role switch. This patch
adds a property to Intel USB Role Switch platform driver
to denote that SW switch should be disabled in
Cherrytrail devices.
Signed-off-by: Saranya Gopal <saranya.go...@intel.com>
Signed-off-by: Balaji Manoharan <m.bal...@intel.com>
Suggested-by: Heikki Krogerus <heikki.kroge...@linux.intel.com>
---
changes since v3: none
changes since v2: Added suggested-by tag
changes since v1: none
drivers/usb/host/xhci-ext-caps.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/usb/host/xhci-ext-caps.c b/drivers/usb/host/xhci-ext-caps.c
index 399113f..f498160 100644
--- a/drivers/usb/host/xhci-ext-caps.c
+++ b/drivers/usb/host/xhci-ext-caps.c
@@ -6,11 +6,20 @@
*/
#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/pci.h>
#include "xhci.h"
#define USB_SW_DRV_NAME "intel_xhci_usb_sw"
#define USB_SW_RESOURCE_SIZE 0x400
+#define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI 0x22b5
+
+static const struct property_entry role_switch_props[] = {
+ PROPERTY_ENTRY_BOOL("sw_switch_disable"),
+ {},
+};
+
static void xhci_intel_unregister_pdev(void *arg)
{
platform_device_unregister(arg);
@@ -21,6 +30,7 @@ static int xhci_create_intel_xhci_sw_pdev(struct xhci_hcd
*xhci, u32 cap_offset)
struct usb_hcd *hcd = xhci_to_hcd(xhci);
struct device *dev = hcd->self.controller;
struct platform_device *pdev;
+ struct pci_dev *pci = to_pci_dev(dev);
struct resource res = { 0, };
int ret;
@@ -43,6 +53,14 @@ static int xhci_create_intel_xhci_sw_pdev(struct xhci_hcd
*xhci, u32 cap_offset)
return ret;
}
+ if (pci->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
+ ret = platform_device_add_properties(pdev, role_switch_props);
+ if (ret) {
+ dev_err(dev, "failed to register device properties\n");
+ return ret;
+ }
+ }
+
pdev->dev.parent = dev;
ret = platform_device_add(pdev);
--
1.9.1
