dwc3-msm: Introduce sysfs param to indicate usb compliance mode
Currently usb stack is teared down if no activity is detected for
10 seconds when floating charger is connected. USB 3.1 compliance
equipment usually reported as floating charger. Introduce sysfs
parameter to indicate if usb compliance in progress and do not
tear down the stack based on this parameter.
Change-Id: I26013c281827f35eac7f21ed68b3880e541d82b9
Signed-off-by: Vamsi Krishna Samavedam <vskrishn@codeaurora.org>
diff --git a/drivers/usb/dwc3/dwc3-msm.c b/drivers/usb/dwc3/dwc3-msm.c
index 6727ced..a49b24e 100644
--- a/drivers/usb/dwc3/dwc3-msm.c
+++ b/drivers/usb/dwc3/dwc3-msm.c
@@ -271,6 +271,7 @@ struct dwc3_msm {
struct pm_qos_request pm_qos_req_dma;
struct delayed_work perf_vote_work;
struct delayed_work sdp_check;
+ bool usb_compliance_mode;
struct mutex suspend_resume_mutex;
};
@@ -2867,6 +2868,13 @@ static void check_for_sdp_connection(struct work_struct *w)
if (!mdwc->vbus_active)
return;
+ /* USB 3.1 compliance equipment usually repoted as floating
+ * charger as HS dp/dm lines are never connected. Do not
+ * tear down USB stack if compliance parameter is set
+ */
+ if (mdwc->usb_compliance_mode)
+ return;
+
/* floating D+/D- lines detected */
if (dwc->gadget.state < USB_STATE_DEFAULT &&
dwc3_gadget_get_link_state(dwc) != DWC3_LINK_STATE_CMPLY) {
@@ -3148,6 +3156,31 @@ static ssize_t speed_store(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RW(speed);
+static ssize_t usb_compliance_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dwc3_msm *mdwc = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%c\n",
+ mdwc->usb_compliance_mode ? 'Y' : 'N');
+}
+
+static ssize_t usb_compliance_mode_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int ret = 0;
+ struct dwc3_msm *mdwc = dev_get_drvdata(dev);
+
+ ret = strtobool(buf, &mdwc->usb_compliance_mode);
+
+ if (ret)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_RW(usb_compliance_mode);
+
+
static int dwc3_msm_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node, *dwc3_node;
@@ -3498,6 +3531,7 @@ static int dwc3_msm_probe(struct platform_device *pdev)
device_create_file(&pdev->dev, &dev_attr_mode);
device_create_file(&pdev->dev, &dev_attr_speed);
+ device_create_file(&pdev->dev, &dev_attr_usb_compliance_mode);
host_mode = usb_get_dr_mode(&mdwc->dwc3->dev) == USB_DR_MODE_HOST;
if (!dwc->is_drd && host_mode) {