servo_v4: servo_micro: cr50: fix usb power declaration

Servo_micro sets usb config maxpower to 100mA.

Servo_v4 is set to self powered as it's powered by a
shared vbus and not be the bub it's connected to.

cr50 is self powered as no power is transmitted as part of CCD.

* Add CONFIG_USB_MAXPOWER_MA to define USB maximum power draw requested
per board.
* Add CONFIG_USB_SELF_POWERED to indicate that a device is not
powered by allocated USB power.

BUG=chromium:631302
TEST=lsusb reports 100mA bMaxPower (micro), Self powered (v4)
BRANCH=None

Change-Id: I79b8ce46f32d94f16104a4a8080104e30dce7f2c
Signed-off-by: Nick Sanders <nsanders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/363153
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

6 files changed, 32 insertions, 4 deletions

diff --git a/board/cr50/board.h b/board/cr50/board.h
index c3b9066730..e74efb193f 100644
--- a/board/cr50/board.h
+++ b/board/cr50/board.h
@@ -57,6 +57,7 @@
 #define CONFIG_CASE_CLOSED_DEBUG
 
 #define CONFIG_USB_PID 0x5014
+#define CONFIG_USB_SELF_POWERED
 
 /* Enable SPI Master (SPI) module */
 #define CONFIG_SPI_MASTER
diff --git a/board/servo_micro/board.h b/board/servo_micro/board.h
index 03e583afeb..b2543c3ac3 100644
--- a/board/servo_micro/board.h
+++ b/board/servo_micro/board.h
@@ -35,6 +35,9 @@
 #define CONFIG_USB_CONSOLE
 #define CONFIG_USB_UPDATE
 
+#undef CONFIG_USB_MAXPOWER_MA
+#define CONFIG_USB_MAXPOWER_MA 100
+
 #define CONFIG_USB_SERIALNO
 #define DEFAULT_SERIALNO "Uninitialized"
 
diff --git a/board/servo_v4/board.h b/board/servo_v4/board.h
index 623c688843..eaad6385b2 100644
--- a/board/servo_v4/board.h
+++ b/board/servo_v4/board.h
@@ -29,6 +29,8 @@
 #define CONFIG_USB_CONSOLE
 #define CONFIG_USB_UPDATE
 
+#define CONFIG_USB_SELF_POWERED
+
 #define CONFIG_USB_SERIALNO
 #define DEFAULT_SERIALNO "Uninitialized"
 
diff --git a/chip/g/usb.c b/chip/g/usb.c
index b5dc8f08bc..809c1aefb0 100644
--- a/chip/g/usb.c
+++ b/chip/g/usb.c
@@ -191,6 +191,14 @@ static void showregs(void)
 #define CONFIG_USB_BCD_DEV 0x0100		/* 1.00 */
 #endif
 
+#ifndef USB_BMATTRIBUTES
+#ifdef CONFIG_USB_SELF_POWERED
+#define USB_BMATTRIBUTES 0xc0  /* Self powered. */
+#else
+#define USB_BMATTRIBUTES 0x80  /* Bus powered. */
+#endif
+#endif
+
 /* USB Standard Device Descriptor */
 static const struct usb_device_descriptor dev_desc = {
 	.bLength = USB_DT_DEVICE_SIZE,
@@ -217,8 +225,8 @@ const struct usb_config_descriptor USB_CONF_DESC(conf) = {
 	.bNumInterfaces = USB_IFACE_COUNT,
 	.bConfigurationValue = 1,		/* Caution: hard-coded value */
 	.iConfiguration = USB_STR_VERSION,
-	.bmAttributes = 0x80,			/* bus powered */
-	.bMaxPower = 250,			/* MaxPower 500 mA */
+	.bmAttributes = USB_BMATTRIBUTES, /* bus or self powered */
+	.bMaxPower = (CONFIG_USB_MAXPOWER_MA / 2),
 };
 
 const uint8_t usb_string_desc[] = {
diff --git a/chip/stm32/usb.c b/chip/stm32/usb.c
index 85e2320642..82b0926702 100644
--- a/chip/stm32/usb.c
+++ b/chip/stm32/usb.c
@@ -35,6 +35,14 @@
 #define CONFIG_USB_BCD_DEV 0x0100 /* 1.00 */
 #endif
 
+#ifndef USB_BMATTRIBUTES
+#ifdef CONFIG_USB_SELF_POWERED
+#define USB_BMATTRIBUTES 0xc0  /* Self powered. */
+#else
+#define USB_BMATTRIBUTES 0x80  /* Bus powered. */
+#endif
+#endif
+
 #ifndef CONFIG_USB_SERIALNO
 #define USB_STR_SERIALNO 0
 #else
@@ -67,8 +75,8 @@ const struct usb_config_descriptor USB_CONF_DESC(conf) = {
 	.bNumInterfaces = USB_IFACE_COUNT,
 	.bConfigurationValue = 1,
 	.iConfiguration = USB_STR_VERSION,
-	.bmAttributes = 0x80, /* bus powered */
-	.bMaxPower = 250, /* MaxPower 500 mA */
+	.bmAttributes = USB_BMATTRIBUTES, /* bus or self powered */
+	.bMaxPower = (CONFIG_USB_MAXPOWER_MA / 2),
 };
 
 const uint8_t usb_string_desc[] = {
diff --git a/include/config.h b/include/config.h
index 6a89266106..a752e4c4d1 100644
--- a/include/config.h
+++ b/include/config.h
@@ -2113,6 +2113,12 @@
 /* Support programmable USB device iSerial field. */
 #undef CONFIG_USB_SERIALNO
 
+/* Support reporting of configuration bMaxPower in mA */
+#define CONFIG_USB_MAXPOWER_MA 500
+
+/* Support reporting as self powered in USB configuration. */
+#undef CONFIG_USB_SELF_POWERED
+
 /******************************************************************************/
 /* USB port switch */