Configurable USB-C alternate mode for multi-level controller communication
Method, apparatus and computer program product embodiments are provided for configuring the USB-C alternate mode feature of a device. The device can be configured to transmit data to both USB-C devices and legacy (non-USB) devices without requiring changes to the device's firmware. Adjusting a USB-C output setting in the device allows the USB-C alternate mode to be switched on or off which enables the device to be updated based on the USB-C capability of other devices connected to the device.
1. A method for configuring a USB-C output setting in a host device, the method comprising:
receiving, by the host device, a signal from a display device;
determining, by an embedded controller within the host device and based on the signal, whether the display device connected to the host device is a USB-C device;
configuring, by the embedded controller, the USB-C output setting in the embedded controller to a first setting based on determining that the display device is the USB-C device, wherein the USB-C output setting controls USB-C alternate modes of the host device;
transmitting, by the embedded controller, the first setting to a host type-C controller;
causing, by the embedded controller, the host type-C controller to transmit the first setting to a device type-C controller, wherein the first setting is configured to adapt the device type-C controller for transmitting data using four lanes of the device type-C controller; and
causing, by the host type-C controller, the device type-C controller to transmit the first setting to a second device type-C controller wherein the first setting is configured to adapt the second device type-C controller for transmitting second data using four lanes of the second device type-C controller.
2. The method of claim 1 , wherein the USB-C output setting is configured to the first setting and wherein a USB-C interface is implemented in the host device, the method further comprising:
transmitting, by the host device and based on the first setting, data using two lanes of the USB-C interface for display data on the display device and two lanes of the USB-C interface for USB 3.0 communications.
3. The method of claim 1 , wherein the USB-C output setting is a BIOS setting of the embedded controller.
4. The method of claim 1 , further comprising:
configuring the USB-C output setting to a second setting based on determining that the display device is a non-USB-C compliant device.
5. The method of claim 4 , wherein the USB-C output setting is configured to the second setting and wherein a USB-C interface is implemented in the host device, the method further comprising:
transmitting, by the host device, data using four lanes of the USB-C interface for display data on the display device.
6. A host device, comprising:
a display interface;
a host type-C controller;
a device type-C controller;
a second device type-C controller;
a memory; and
an embedded controller communicatively coupled to the memory and configured to:
receive, by the host device, a signal from a display device;
determine, based on the signal, whether the display device connected to the display interface is a USB-C device;
configure a USB-C output setting to a first setting based on determining that the display device is the USB-C device, wherein the USB-C output setting controls USB-C alternate modes of the host device;
transmit the first setting to the host type-C controller;
cause the host type-C controller to transmit the first setting to the device type-C controller, wherein the first setting is configured to adapt the device type-C controller for transmitting data using four lanes of the device type-C controller; and
cause the device type-C controller to transmit the first setting to the second device type-C controller wherein the first setting is configured to adapt the second device type-C controller for transmitting second data using four lanes of the second device type-C controller.
7. The host device of claim 6 , further comprising a USB-C interface and wherein when the USB-C output setting is configured to the first setting, the embedded controller is further configured to:
transmit, based on the first setting, data using two lanes of the USB-C interface for display data on the display device and two lanes of the USB-C interface for USB 3.0 communications.
8. The host device of claim 6 , wherein the USB-C output setting is a BIOS setting of the embedded controller.
9. The host device of claim 6 , wherein the embedded controller is further configured to:
configure the USB-C output setting to a second setting based on determining that the display device is a non-USB-C device.
10. The host device of claim 9 , wherein when the USB-C output setting is configured to the second setting, the embedded controller is further configured to:
transmit, by the embedded controller, data using four lanes of a USB-C interface implemented in the host device.
11. A non-transitory computer-readable medium storing instructions, wherein the instructions, when executed by a processor of a host device, cause the processor to perform operations comprising:
receiving, by the host device, a signal from a display device;
determining, based on the signal, whether the display device connected to the host device is a USB-C device;
configuring a USB-C output setting to a first setting based on determining that the display device is a non-USB-C device, wherein the USB-C output setting controls USB-C alternate modes of the host device;
transmitting the first setting to a host type-C controller in the host device;
causing the host type-C controller to transmit the first setting to a device type-C controller in the host device, wherein the first setting is configured to adapt the device type-C controller for transmitting data using four lanes of the device type-C controller; and
causing the device type-C controller to transmit the first setting to a second device type-C controller wherein the first setting is configured to adapt the second device type-C controller for transmitting second data using four lanes of the second device type-C controller.
12. The non-transitory computer-readable medium of claim 11 , wherein the USB-C output setting is configured to the first setting and wherein a USB-C interface is implemented in a host device, the operations further comprising:
transmitting, by the host device and based on the first setting, data using two lanes of the USB-C interface for display data on the display device and two lanes of the USB-C interface for USB 3.0 communications.
13. The non-transitory computer-readable medium of claim 11 , wherein the USB-C output setting is a BIOS setting of an embedded controller in the host device.
14. The non-transitory computer-readable medium of claim 11 , the operations further comprising:
configuring the USB-C output setting to a second setting based on determining that the display device is a non-USB-C compliant device.
15. The non-transitory computer-readable medium of claim 14 , wherein the USB-C output setting is configured to the second setting and wherein a USB-C interface is implemented in the host device, the operations further comprising:
transmitting, by the host device, data using four lanes of the USB-C interface for display data on the display device.