[PATCH 4.10 080/110] usb: dwc3: host: pass quirk-broken-port-ped property for known broken revisions

[Greg Kroah-Hartman]

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felipe Balbi <felipe.ba...@linux.intel.com>

[ Upstream commit e42a5dbb8a3d14f5a35bffa3bf7dcb87883f767a ]

dwc3 revisions <=3.00a have a limitation where Port Disable command
doesn't work. Set the quirk-broken-port-ped property for such
controllers so XHCI core can do the necessary workaround.

[rog...@ti.com] Updated code from platform data to device property.

Signed-off-by: Roger Quadros <rog...@ti.com>
Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/usb/dwc3/host.c |   21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -54,11 +54,12 @@ out:
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
-       struct property_entry   props[2];
+       struct property_entry   props[3];
        struct platform_device  *xhci;
        int                     ret, irq;
        struct resource         *res;
        struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
+       int                     prop_idx = 0;
 
        irq = dwc3_host_get_irq(dwc);
        if (irq < 0)
@@ -97,8 +98,22 @@ int dwc3_host_init(struct dwc3 *dwc)
 
        memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 
-       if (dwc->usb3_lpm_capable) {
-               props[0].name = "usb3-lpm-capable";
+       if (dwc->usb3_lpm_capable)
+               props[prop_idx++].name = "usb3-lpm-capable";
+
+       /**
+        * WORKAROUND: dwc3 revisions <=3.00a have a limitation
+        * where Port Disable command doesn't work.
+        *
+        * The suggested workaround is that we avoid Port Disable
+        * completely.
+        *
+        * This following flag tells XHCI to do just that.
+        */
+       if (dwc->revision <= DWC3_REVISION_300A)
+               props[prop_idx++].name = "quirk-broken-port-ped";
+
+       if (prop_idx) {
                ret = platform_device_add_properties(xhci, props);
                if (ret) {
                        dev_err(dwc->dev, "failed to add properties to xHCI\n");