Skip to content
Snippets Groups Projects
Commit 522968ae authored by Rodrigo Siqueira's avatar Rodrigo Siqueira Committed by Alex Deucher
Browse files

Documentation/gpu: Add basic overview of DC pipeline 


This commit describes how DCN works by providing high-level diagrams
with an explanation of each component. In particular, it details the
Global Sync signals.

Change since V2:
 - Add a comment about MMHUBBUB.

Reviewed-by: default avatarYann Dirson <ydirson@free.fr>
Reviewed-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 76659755
No related branches found
No related tags found
No related merge requests found
Expand all Hide whitespace changes
Inline Side-by-side
Documentation/gpu/amdgpu/display/config_example.svg 0 → 100644
+ 414
− 0
View file @ 522968ae
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
width="144.63406mm"
height="66.596054mm"
viewBox="0 0 144.15195 66.596054"
version="1.1"
id="svg8"
inkscape:version="0.92.5 (2060ec1f9f, 2020-04-08)"
sodipodi:docname="config_example.svg">
<defs
id="defs2">
<marker
inkscape:stockid="Arrow1Mend"
orient="auto"
refY="0"
refX="0"
id="Arrow1Mend"
style="overflow:visible"
inkscape:isstock="true">
<path
id="path4547"
d="M 0,0 5,-5 -12.5,0 5,5 Z"
style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:1.00000003pt;stroke-opacity:1"
transform="matrix(-0.4,0,0,-0.4,-4,0)"
inkscape:connector-curvature="0" />
</marker>
<marker
inkscape:stockid="Arrow1Mend"
orient="auto"
refY="0"
refX="0"
id="Arrow1Mend-3"
style="overflow:visible"
inkscape:isstock="true">
<path
inkscape:connector-curvature="0"
id="path4547-6"
d="M 0,0 5,-5 -12.5,0 5,5 Z"
style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:1.00000003pt;stroke-opacity:1"
transform="matrix(-0.4,0,0,-0.4,-4,0)" />
</marker>
<marker
inkscape:stockid="Arrow1Mend"
orient="auto"
refY="0"
refX="0"
id="Arrow1Mend-3-5"
style="overflow:visible"
inkscape:isstock="true">
<path
inkscape:connector-curvature="0"
id="path4547-6-3"
d="M 0,0 5,-5 -12.5,0 5,5 Z"
style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:1.00000003pt;stroke-opacity:1"
transform="matrix(-0.4,0,0,-0.4,-4,0)" />
</marker>
<marker
inkscape:stockid="Arrow1Mend"
orient="auto"
refY="0"
refX="0"
id="Arrow1Mend-3-5-0"
style="overflow:visible"
inkscape:isstock="true">
<path
inkscape:connector-curvature="0"
id="path4547-6-3-6"
d="M 0,0 5,-5 -12.5,0 5,5 Z"
style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:1.00000003pt;stroke-opacity:1"
transform="matrix(-0.4,0,0,-0.4,-4,0)" />
</marker>
<marker
inkscape:stockid="Arrow1Mend"
orient="auto"
refY="0"
refX="0"
id="Arrow1Mend-3-5-7"
style="overflow:visible"
inkscape:isstock="true">
<path
inkscape:connector-curvature="0"
id="path4547-6-3-3"
d="M 0,0 5,-5 -12.5,0 5,5 Z"
style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:1.00000003pt;stroke-opacity:1"
transform="matrix(-0.4,0,0,-0.4,-4,0)" />
</marker>
</defs>
<sodipodi:namedview
id="base"
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1.0"
inkscape:pageopacity="0.0"
inkscape:pageshadow="2"
inkscape:zoom="0.98994949"
inkscape:cx="518.91791"
inkscape:cy="172.50112"
inkscape:document-units="mm"
inkscape:current-layer="layer1"
showgrid="true"
viewbox-width="209.3"
inkscape:window-width="3840"
inkscape:window-height="1136"
inkscape:window-x="0"
inkscape:window-y="27"
inkscape:window-maximized="1"
fit-margin-top="0"
fit-margin-left="0"
fit-margin-right="0"
fit-margin-bottom="0">
<inkscape:grid
type="xygrid"
id="grid817"
originx="4.390216"
originy="-208.88856" />
</sodipodi:namedview>
<metadata
id="metadata5">
<rdf:RDF>
<cc:Work
rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
<dc:title></dc:title>
</cc:Work>
</rdf:RDF>
</metadata>
<g
inkscape:label="Layer 1"
inkscape:groupmode="layer"
id="layer1"
transform="translate(4.4048992,-21.515392)">
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="m 20.816662,35.062492 h 23.8125 v -5.291667 h 5.291667 v 5.291667 h 10.583334 v -5.291667 h 5.291667 v 5.291667 h 2.645833 v -5.291667 h 5.291667 v 5.291667 h 66.14583"
id="path4522"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="m 20.816662,48.291659 h 7.9375 v -5.291667 h 5.291667 v 5.291667 h 58.208335 v -5.291667 h 5.291666 v 5.291667 h 42.33333"
id="path4524"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="m 20.816662,61.520826 h 26.458334 v -5.291667 h 44.979168 v 5.291667 h 47.624996"
id="path4526"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="M 20.816662,72.104159 H 139.87916"
id="path4528"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="M 20.816662,77.395826 H 139.87916"
id="path4530"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="M 20.816662,82.687493 H 139.87916"
id="path4532"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.26458335px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="M 20.816662,87.97916 H 139.87916"
id="path4534"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#ff0000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:0.52916668, 0.52916668;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend)"
d="m 47.274996,29.770826 c 3.836215,14.933158 3.472151,27.586643 0.264583,41.010418"
id="path4536"
inkscape:connector-curvature="0"
sodipodi:nodetypes="cc" />
<path
style="fill:none;stroke:#ff0000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:0.52916669, 0.52916669;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend-3)"
d="m 63.149996,29.770826 c 3.836214,14.933158 5.059652,27.586642 1.852084,41.010418"
id="path4536-7"
inkscape:connector-curvature="0"
sodipodi:nodetypes="cc" />
<path
style="fill:none;stroke:#ff0000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:0.5291667, 0.5291667;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend-3-5)"
d="m 71.087496,29.770825 c 3.836214,14.933158 5.059652,27.586643 1.852084,41.010419"
id="path4536-7-5"
inkscape:connector-curvature="0"
sodipodi:nodetypes="cc" />
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="59.359009"
y="24.195677"
id="text6572"><tspan
sodipodi:role="line"
x="59.359009"
y="24.195677"
style="font-size:3.52777791px;line-height:5.39999962;text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan6574">Configurations</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="46.825508"
y="28.542402"
id="text6572-6"><tspan
sodipodi:role="line"
x="46.825508"
y="28.542402"
style="font-size:3.52777815px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#008000;stroke-width:0.26458335"
id="tspan6574-2">A</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="62.8895"
y="28.825886"
id="text6572-6-2"><tspan
sodipodi:role="line"
x="62.8895"
y="28.825886"
style="font-size:3.52777839px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#0000ff;stroke-width:0.26458335"
id="tspan6574-2-7">B</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="70.827003"
y="29.109362"
id="text6572-6-2-3"><tspan
sodipodi:role="line"
x="70.827003"
y="29.109362"
style="font-size:3.52777863px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#c87137;stroke-width:0.26458335"
id="tspan6574-2-7-6">C</tspan></text>
<path
style="fill:none;stroke:#ff0000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:0.52916671, 0.52916671;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend-3-5-0)"
d="m 92.254164,42.999993 c 9.142136,12.745655 4.411987,28.608461 0.529167,38.364584"
id="path4536-7-5-2"
inkscape:connector-curvature="0"
sodipodi:nodetypes="cc" />
<path
style="fill:none;stroke:#000000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
d="m 47.274996,72.104159 v 5.291667"
id="path8053"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
d="m 64.472913,72.10416 v 5.291667"
id="path8053-6"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
d="m 72.410413,72.10416 v 5.291667"
id="path8053-6-1"
inkscape:connector-curvature="0" />
<path
style="fill:none;stroke:#000000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
d="m 92.254164,82.687494 v 5.291667"
id="path8053-6-1-8"
inkscape:connector-curvature="0" />
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="55.802444"
y="76.167412"
id="text6572-6-7"><tspan
sodipodi:role="line"
x="55.802444"
y="76.167412"
style="font-size:3.52777839px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#008000;stroke-width:0.26458335"
id="tspan6574-2-9">A</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="68.559143"
y="75.883926"
id="text6572-6-2-2"><tspan
sodipodi:role="line"
x="68.559143"
y="75.883926"
style="font-size:3.52777863px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#0000ff;stroke-width:0.26458335"
id="tspan6574-2-7-0">B</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="84.812119"
y="75.883911"
id="text6572-6-2-3-2"><tspan
sodipodi:role="line"
x="84.812119"
y="75.883911"
style="font-size:3.52777863px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#c87137;stroke-width:0.26458335"
id="tspan6574-2-7-6-3">C</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="98.513756"
y="86.845222"
id="text6572-6-2-3-2-7"><tspan
sodipodi:role="line"
x="98.513756"
y="86.845222"
style="font-size:3.52777863px;line-height:5.39999962;text-align:center;text-anchor:middle;fill:#c87137;stroke-width:0.26458335"
id="tspan6574-2-7-6-3-5">C</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="35.452015"
y="75.694931"
id="text6572-9"><tspan
sodipodi:role="line"
x="35.452015"
y="75.694931"
style="font-size:3.52777815px;line-height:5.39999962;text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan6574-22">Old config</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="55.484753"
y="86.656235"
id="text6572-9-8"><tspan
sodipodi:role="line"
x="55.484753"
y="86.656235"
style="font-size:3.52777839px;line-height:5.39999962;text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan6574-22-9">Old config</tspan></text>
<path
style="fill:none;stroke:#ff0000;stroke-width:0.5291667;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:0.52916671, 0.52916671;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend-3-5-7)"
d="m 92.254164,42.999993 c 4.233333,4.7625 2.645833,13.229167 0.79375,17.197917"
inkscape:connector-curvature="0"
sodipodi:nodetypes="cc" />
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:10.58333397px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="3.7020128"
y="33.550579"
id="text6572-1"><tspan
sodipodi:role="line"
x="3.7020128"
y="42.914349"
style="font-size:3.52777815px;line-height:5.39999962;text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15310" /></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:3.17500019px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="13.366468"
y="46.590767"
id="text15316"><tspan
sodipodi:role="line"
x="13.366468"
y="46.590767"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15318">VUpdate</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:3.17500043px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="14.45245"
y="29.676321"
id="text15316-3"><tspan
sodipodi:role="line"
id="tspan15314-1"
x="14.45245"
y="29.676321"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335">Update</tspan><tspan
sodipodi:role="line"
x="14.45245"
y="33.645073"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15318-9">Lock</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:3.17500043px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="7.5676007"
y="56.985115"
id="text15316-4"><tspan
sodipodi:role="line"
x="7.5676007"
y="56.985115"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15318-7">Register update</tspan><tspan
sodipodi:role="line"
x="7.5676007"
y="60.953865"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15361">Pending Status</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:3.17500043px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="16.074829"
y="76.167404"
id="text15316-8"><tspan
sodipodi:role="line"
x="16.074829"
y="76.167404"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15318-4">Buf 0</tspan></text>
<text
xml:space="preserve"
style="font-style:normal;font-weight:normal;font-size:3.17500067px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458335"
x="16.156994"
y="86.089279"
id="text15316-8-5"><tspan
sodipodi:role="line"
x="16.156994"
y="86.089279"
style="text-align:center;text-anchor:middle;stroke-width:0.26458335"
id="tspan15318-4-0">Buf 1</tspan></text>
</g>
</svg>
Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg 0 → 100644
+ 1125
− 0
View file @ 522968ae
This diff is collapsed.
Documentation/gpu/amdgpu/display/dcn-overview.rst 0 → 100644
+ 171
− 0
View file @ 522968ae
=======================
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
Documentation/gpu/amdgpu/display/global_sync_vblank.svg 0 → 100644
+ 485
− 0
View file @ 522968ae
This diff is collapsed.
Documentation/gpu/amdgpu/display/index.rst
+ 11
− 12
View file @ 522968ae
......@@ -2,28 +2,27 @@
drm/amd/display - Display Core (DC)
===================================
*placeholder - general description of supported platforms, what dc is, etc.*
Because it is partially shared with other operating systems, the Display Core
Driver is divided in two pieces.
AMD display engine is partially shared with other operating systems; for this
reason, our Display Core Driver is divided into two pieces:
1. **Display Core (DC)** contains the OS-agnostic components. Things like
hardware programming and resource management are handled here.
2. **Display Manager (DM)** contains the OS-dependent components. Hooks to the
amdgpu base driver and DRM are implemented here.
It doesn't help that the entire package is frequently referred to as DC. But
with the context in mind, it should be clear.
The display pipe is responsible for "scanning out" a rendered frame from the
GPU memory (also called VRAM, FrameBuffer, etc.) to a display. In other words,
it would:
When CONFIG_DRM_AMD_DC is enabled, DC will be initialized by default for
supported ASICs. To force disable, set `amdgpu.dc=0` on kernel command line.
Likewise, to force enable on unsupported ASICs, set `amdgpu.dc=1`.
1. Read frame information from memory;
2. Perform required transformation;
3. Send pixel data to sink devices.
To determine if DC is loaded, search dmesg for the following entry:
If you want to learn more about our driver details, take a look at the below
table of content:
.. toctree::
display-manager.rst
dc-debug.rst
``Display Core initialized with <version number here>``
dcn-overview.rst
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment