The following table shows the mapping between the HDMI 2.1 TX, HDMI 2.1 TX SS interrupts and HDMI 2.1 TX controlling layer events that trigger state transitions.
| HDMI 2.1 TX Interrupts | HDMI 2.1 TX SS Callback | HDMI 2.1 TX Interrupt Controlling Layer Event | Label |
|---|---|---|---|
| HPD |
XV_HDMITXSS1_HANDLER_CONNECT XV_HDMITXSS1_HANDLER_TOGGLE |
XV_TX_HDMI_EVENT_DISCONNECTED XV_TX_HDMI_EVENT_CONNECTED |
A B |
| Link Ready |
XV_HDMITXSS1_HANDLER_STREAM_UP XV_HDMITXSS1_HANDLER_STREAM_DOWN Note:
Two callbacks are mapped to the
same interrupt source.
Link Ready rising edge: Stream Up Link Ready falling edge: Stream Down |
XV_TX_HDMI_EVENT_STREAMUP XV_TX_HDMI_EVENT_STREAMDOWN |
C D |
| Vertical Sync | XV_HDMITXSS1_HANDLER_VS | XV_TX_HDMI_EVENT_VSYNC | E |
| Video Bridge Unlocked | XV_HDMITXSS1_HANDLER_BRDGLOCK XV_HDMITXSS1_HANDLER_BRDGUNLOCK | XV_TX_HDMI_EVENT_BRDGUNLOCKED | F |
| Video Bridge Overflow | XV_HDMITXSS1_HANDLER_BRDGOVERFLOW | XV_TX_HDMI_EVENT_BRDGOVERFLOW | G |
| Video Bridge Underflow | XV_HDMITXSS1_HANDLER_BRDGUNDERFLOW | XV_TX_HDMI_EVENT_BRDGUNDERFLOW | H |
| FRL Interrupt |
XV_HDMITXSS1_HANDLER_FRL_CONFIG XV_HDMITXSS1_HANDLER_FRL_FFE XV_HDMITXSS1_HANDLER_FRL_START XV_HDMITXSS1_HANDLER_FRL_STOP XV_HDMITXSS1_HANDLER_TMDS_CONFIG |
XV_TX_HDMI_EVENT_FRLCONFIG XV_TX_HDMI_EVENT_FRLFFE XV_TX_HDMI_EVENT_FRLSTART XV_TX_HDMI_EVENT_FRLSTOP XV_TX_HDMI_EVENT_TMDSCONFIG |
I J K L M |
| HDCP 1.4 Interrupt | |||
| HDCP 1.4 Timer Interrupt | |||
| HDCP 2.3 Interrupt | |||
| HDCP 2.3 Timer Interrupt | |||
|
XV_HDMITXSS1_HANDLER_HDCP_AUTHENTICATE XV_HDMITXSS1_HANDLER_HDCP_DOWNSTREAM_TOPOLOGY_AVAILABLE XV_HDMITXSS1_HANDLER_HDCP_UNAUTHENTICATED Note:
This callback function is not
directly mapped to any interrupt source. Instead it is executed
when the HDCP authentication state machine has reached the
authenticated state.
|
|||
| Dynamic HDR MTW Interrupt | XV_HDMITXSS1_HANDLER_ DYNHDR_MTW |
The following figure shows the control flow of the HDMI 2.1 TX Subsystem interrupts received by the application. See the previous table for more details on the mapping of interrupts and events. The event LABEL from the previous table is marked as the event cause of state transitions in the following figure.
In the HDMI 2.1 TX Interrupt controlling layer each interrupt received from the HDMI 2.1 TX subsystem has its corresponding state. This allows the application to track the last received interrupt and control the behavior of HDMI 2.1 TX based on the next interrupt received. This allows the application to control the flow of HDMI 2.1 TX subsystem interrupts from the connection of the TX cable to the disconnection of the TX cable.
The control of flow and transition from one interrupt state to another can be modified to accommodate a required level of leniency or strictness. The previous figure shows a minimalist and strict transition between the states.
The state transitions in the HDMI 2.1 TX interrupt controlling layer can be changed and updated depending on the extent of strictness of leniency that you want in serving the interrupts from the HDMI 2.1 TX subsystem. The application implements a formal and minimal flow control of the interrupts.
The following is a description of the HDMI 2.1 TX states and transitions that are allowed on the state. You are at liberty to allow or disallow transitions as needed.
- STATE CONNECTED - The state machine transitions to this state after receiving the connect interrupt from the HDMI 2.1 TX subsystem. Ideally, the transition to this state should happen only from the disconnected state.
- STATE FRL CONFIG - The state machine transitions to this state after receiving the frl config request interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state from all states except disconnect. In case of multiple frl config requests, each interrupt is serviced exclusively.
- STATE TMDS CONFIG - The state machine transitions to this state after receiving the tmds config request interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state from all states except disconnect. In case of multiple tmds config requests, each interrupt is serviced exclusively, although multiple tmds request interrupts should not be expected.
- STATE FRL FFE - The state machine transitions to this state after receiving the frl ffe interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state from either the frl config, frl start or frl stop states. FRL ffe received on any other state is ignored.
- STATE FRL START - The state machine transitions to this state after receiving the frl start interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state from either the frl config, frl ffe or frl stop states. FRL start received on any other state is ignored.
- STATE FRL STOP - The state machine transitions to this state after receiving the frl stop interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state from frl config, frl ffe, frl start, stream on and vsync states.
- STATE STREAM ON - The state machine transitions to this state after receiving the stream up interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state only from the frl start, tmds config and stream off states.
- STATE VSYNC - The state machine transitions to this state after receiving the vsync interrupt from the HDMI 2.1 TX subsystem. The state machine transitions to this state only from the stream on and bridge unlocked state states. As multiple vsync interrupts are received., each interrupt is serviced exclusively. A vsync interrupt received when the state machine is in any state other than stream on, bridge unlocked or vsync is ignored.
- STATE BRIDGE UNLOCKED - The state machine transitions to this state after receiving the bridge unlocked interrupt from the HDMI 2.1 TX subsystem. Ideally, the transition to this state happens only from the vsync or stream on state.
- STATE STREAM OFF - The state machine will transition to this state upon receiving the stream down interrupt from the HDMI 2.1 TX subsystem drivers. Transition to this state can happen from any state.
- STATE DISCONNECTED - This is the default state to which the state machine is initialized. The state machine will transition to this state upon receiving the disconnect interrupt from the HDMI 2.1 TX subsystem drivers. Transition to this state must happen from every state.