amdgpu/display/dcn-overview.rst

=======================
Display Core Next (DCN)
=======================

To equip our readers with the basic knowledge of how AMD Display Core Next
(DCN) works, we need to start with an overview of the hardware pipeline. Below
you can see a picture that provides a DCN overview, keep in mind that this is a
generic diagram, and we have variations per ASIC.

.. kernel-figure:: dc_pipeline_overview.svg

Based on this diagram, we can pass through each block and briefly describe
them:

* **Display Controller Hub (DCHUB)**: This is the gateway between the Scalable
  Data Port (SDP) and DCN. This component has multiple features, such as memory
  arbitration, rotation, and cursor manipulation.

* **Display Pipe and Plane (DPP)**: This block provides pre-blend pixel
  processing such as color space conversion, linearization of pixel data, tone
  mapping, and gamut mapping.

* **Multiple Pipe/Plane Combined (MPC)**: This component performs blending of
  multiple planes, using global or per-pixel alpha.

* **Output Pixel Processing (OPP)**: Process and format pixels to be sent to
  the display.

* **Output Pipe Timing Combiner (OPTC)**: It generates time output to combine
  streams or divide capabilities. CRC values are generated in this block.

* **Display Output (DIO)**: Codify the output to the display connected to our
  GPU.

* **Display Writeback (DWB)**: It provides the ability to write the output of
  the display pipe back to memory as video frames.

* **Multi-Media HUB (MMHUBBUB)**: Memory controller interface for DMCUB and DWB
  (Note that DWB is not hooked yet).

* **DCN Management Unit (DMU)**: It provides registers with access control and
  interrupts the controller to the SOC host interrupt unit. This block includes
  the Display Micro-Controller Unit - version B (DMCUB), which is handled via
  firmware.

* **DCN Clock Generator Block (DCCG)**: It provides the clocks and resets
  for all of the display controller clock domains.

* **Azalia (AZ)**: Audio engine.

The above diagram is an architecture generalization of DCN, which means that
every ASIC has variations around this base model. Notice that the display
pipeline is connected to the Scalable Data Port (SDP) via DCHUB; you can see
the SDP as the element from our Data Fabric that feeds the display pipe.

Always approach the DCN architecture as something flexible that can be
configured and reconfigured in multiple ways; in other words, each block can be
setup or ignored accordingly with userspace demands. For example, if we
want to drive an 8k@60Hz with a DSC enabled, our DCN may require 4 DPP and 2
OPP. It is DC's responsibility to drive the best configuration for each
specific scenario. Orchestrate all of these components together requires a
sophisticated communication interface which is highlighted in the diagram by
the edges that connect each block; from the chart, each connection between
these blocks represents:

1. Pixel data interface (red): Represents the pixel data flow;
2. Global sync signals (green): It is a set of synchronization signals composed
   by VStartup, VUpdate, and VReady;
3. Config interface: Responsible to configure blocks;
4. Sideband signals: All other signals that do not fit the previous one.

These signals are essential and play an important role in DCN. Nevertheless,
the Global Sync deserves an extra level of detail described in the next
section.

All of these components are represented by a data structure named dc_state.
From DCHUB to MPC, we have a representation called dc_plane; from MPC to OPTC,
we have dc_stream, and the output (DIO) is handled by dc_link. Keep in mind
that HUBP accesses a surface using a specific format read from memory, and our
dc_plane should work to convert all pixels in the plane to something that can
be sent to the display via dc_stream and dc_link.

Front End and Back End
----------------------

Display pipeline can be broken down into two components that are usually
referred as **Front End (FE)** and **Back End (BE)**, where FE consists of:

* DCHUB (Mainly referring to a subcomponent named HUBP)
* DPP
* MPC

On the other hand, BE consist of

* OPP
* OPTC
* DIO (DP/HDMI stream encoder and link encoder)

OPP and OPTC are two joining blocks between FE and BE. On a side note, this is
a one-to-one mapping of the link encoder to PHY, but we can configure the DCN
to choose which link encoder to connect to which PHY. FE's main responsibility
is to change, blend and compose pixel data, while BE's job is to frame a
generic pixel stream to a specific display's pixel stream.

Data Flow
---------

Initially, data is passed in from VRAM through Data Fabric (DF) in native pixel
formats. Such data format stays through till HUBP in DCHUB, where HUBP unpacks
different pixel formats and outputs them to DPP in uniform streams through 4
channels (1 for alpha + 3 for colors).

The Converter and Cursor (CNVC) in DPP would then normalize the data
representation and convert them to a DCN specific floating-point format (i.e.,
different from the IEEE floating-point format). In the process, CNVC also
applies a degamma function to transform the data from non-linear to linear
space to relax the floating-point calculations following. Data would stay in
this floating-point format from DPP to OPP.

Starting OPP, because color transformation and blending have been completed
(i.e alpha can be dropped), and the end sinks do not require the precision and
dynamic range that floating points provide (i.e. all displays are in integer
depth format), bit-depth reduction/dithering would kick in. In OPP, we would
also apply a regamma function to introduce the gamma removed earlier back.
Eventually, we output data in integer format at DIO.

Global Sync
-----------

Many DCN registers are double buffered, most importantly the surface address.
This allows us to update DCN hardware atomically for page flips, as well as
for most other updates that don't require enabling or disabling of new pipes.

(Note: There are many scenarios when DC will decide to reserve extra pipes
in order to support outputs that need a very high pixel clock, or for
power saving purposes.)

These atomic register updates are driven by global sync signals in DCN. In
order to understand how atomic updates interact with DCN hardware, and how DCN
signals page flip and vblank events it is helpful to understand how global sync
is programmed.

Global sync consists of three signals, VSTARTUP, VUPDATE, and VREADY. These are
calculated by the Display Mode Library - DML (drivers/gpu/drm/amd/display/dc/dml)
based on a large number of parameters and ensure our hardware is able to feed
the DCN pipeline without underflows or hangs in any given system configuration.
The global sync signals always happen during VBlank, are independent from the
VSync signal, and do not overlap each other.

VUPDATE is the only signal that is of interest to the rest of the driver stack
or userspace clients as it signals the point at which hardware latches to
atomically programmed (i.e. double buffered) registers. Even though it is
independent of the VSync signal we use VUPDATE to signal the VSync event as it
provides the best indication of how atomic commits and hardware interact.

Since DCN hardware is double-buffered the DC driver is able to program the
hardware at any point during the frame.

The below picture illustrates the global sync signals:

.. kernel-figure:: global_sync_vblank.svg

These signals affect core DCN behavior. Programming them incorrectly will lead
to a number of negative consequences, most of them quite catastrophic.

The following picture shows how global sync allows for a mailbox style of
updates, i.e. it allows for multiple re-configurations between VUpdate
events where only the last configuration programmed before the VUpdate signal
becomes effective.

.. kernel-figure:: config_example.svg