usb: android: Add support for voting against APPS idle standalone PC
Allowing idle standalone PC when USB cable is connected will degrade
mass storage performance numbers. Add support for reading swfi latency
to vote for DMA latency when USB cable is connected.
Change-Id: Id60cc9ef516944c8338c02e450ba849d42465ab1
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
diff --git a/Documentation/devicetree/bindings/usb/msm-hsusb.txt b/Documentation/devicetree/bindings/usb/msm-hsusb.txt
index 186a58d..7bff0f2 100644
--- a/Documentation/devicetree/bindings/usb/msm-hsusb.txt
+++ b/Documentation/devicetree/bindings/usb/msm-hsusb.txt
@@ -81,13 +81,16 @@
- compatible: should be "qcom,android-usb"
Optional properties :
-- reg : offset and length of memory region that is used by driver to
+- reg : offset and length of memory region that is used by device to
update USB PID and serial numbers used by bootloader in DLOAD mode.
+- qcom,android-usb-swfi-latency : value to be used by device to vote
+ for DMA latency in microsecs.
Example Android USB device node :
android_usb@fc42b0c8 {
compatible = "qcom,android-usb";
reg = <0xfc42b0c8 0xc8>;
+ qcom,android-usb-swfi-latency = <1>;
};
diff --git a/drivers/usb/gadget/android.c b/drivers/usb/gadget/android.c
index 52c19cf..58a53bc 100644
--- a/drivers/usb/gadget/android.c
+++ b/drivers/usb/gadget/android.c
@@ -24,6 +24,7 @@
#include <linux/utsname.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
+#include <linux/of.h>
#include <linux/usb/ch9.h>
#include <linux/usb/composite.h>
@@ -2384,11 +2385,26 @@
static int __devinit android_probe(struct platform_device *pdev)
{
- struct android_usb_platform_data *pdata = pdev->dev.platform_data;
+ struct android_usb_platform_data *pdata;
struct android_dev *android_dev;
struct resource *res;
int ret = 0;
+ if (pdev->dev.of_node) {
+ dev_dbg(&pdev->dev, "device tree enabled\n");
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ pr_err("unable to allocate platform data\n");
+ return -ENOMEM;
+ }
+
+ of_property_read_u32(pdev->dev.of_node,
+ "qcom,android-usb-swfi-latency",
+ &pdata->swfi_latency);
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
+
if (!android_class) {
android_class = class_create(THIS_MODULE, "android_usb");
if (IS_ERR(android_class))