Introducing omap4 display features generic linux multimedia video team june 10 2010
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Introducing OMAP4 Display Features Generic Linux Multimedia - Video team June 10 2010. Team Introduction. OMAP4 Display Subsystem – Quick Introduction. Two LCD outputs and one TV output, each one with a dedicated overlay manager

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Introducing omap4 display features generic linux multimedia video team june 10 2010

Introducing OMAP4 Display FeaturesGeneric Linux Multimedia - Video teamJune 10 2010



Omap4 display subsystem quick introduction
OMAP4 Display Subsystem – Quick Introduction

  • Two LCD outputs and one TV output, each one with a dedicated overlay manager

  • One graphics pipeline (GFX), three video pipelines, and one write-back pipeline

  • Supports HDMI1.3

  • Additional support of NV12 color format

  • TILER memory support in DSS HW.

  • In 4430 SDP & blaze boards, pico DLP is connected through DPI


Feature list
Feature List

  • DISPC changes

    • Secondary LCD overlay manager support

    • Addition of video pipeline

    • NV12 color format support

    • Z-order support

  • Clock changes

  • DSI changes

  • HDMI

  • HW MOD adaptations

  • WB pipeline

  • Pico-DLP

  • TILER-support


Dispc changes
DISPC Changes

a. Secondary LCD support

  • Adding overlay manager for secondary LCD

  • Set of registers are similar to primary LCD

  • Need a new enum ‘channel’ to differentiate between primary and secondary LCD

  • Patches are available to introduce this feature

  • Testing done on OMAP4, needs to be done on OMAP3 to ensure nothing breaks

  • Will be submitted by mid June

b. Addition of video pipeline

  • Addition of overlay object is needed to support the VID3 pipeline

  • Patches are available to introduce this feature

  • Testing done on OMAP4, needs to be done on OMAP3 to ensure nothing breaks

  • Will be submitted by end June


Dispc changes1
DISPC Changes

c. NV12 color format support

  • YUV420-NV12 color format

    • 8-bitY plane followed by an interleaved U/V plane with 2x2 subsampling

  • Separate set of registers for Y & U/V plane needs to be introduced

    • Base address register

    • Attributes register

    • Scaling coefficient register

  • Patches are available to introduce this feature

  • Testing done on OMAP4, needs to be done on OMAP3 to ensure nothing breaks

  • First submission targeted in July

    d. Z-order support

  • OMAP3 supported only 2 distinct modes, alpha & normal mode

  • Software in OMAP4 can set order of video & graphics pipeline using the priority set by Z-order

  • Patches are available to introduce this feature

  • Testing done on OMAP4, needs to be done on OMAP3 to ensure nothing breaks

  • First submission targeted in mid-June


Clock changes
Clock Changes

  • New clocks added by introduction of Secondary DSI & HDMI PLLs

  • RFC is in progress; Target submission is in end June


Dsi changes
DSI Changes

  • Secondary DSI engine, PLL & PHY introduced

  • DSI2 is connected to secondary LCD

  • Separate DSI2 registers introduced are similar to DSI1

  • enum ‘channel’ which differentiates between primary and secondary LCD is used to distinguish between DSI1 & DSI2

  • Both DSI engines have dedicated IRQ lines for A9

  • Preliminary patches exist to support functionality. Needs cleanup

  • Target first submission by end June


Hdmi support
HDMI Support

  • HDMI protocol engine:

    • Supports HDMI 1.3

    • 30-bit RGB color

    • Deep color mode support (10-bit for 1080p and up to 12-bit for 1080i/720p)

  • HDMI driver & corresponding panel driver needs to be introduced

  • Similar to a VENC driver

  • EDID & Hot Plug Detect (HPD) support

  • RFC is in progress; target submission date by end of June

  • Functional patches exist, need to reorganize


Hw mod adaptations
HW MOD Adaptations

  • Adapt dss driver to omap_hwmod framework

  • Use omap_device api's to request/release power resources instead of using clock/regulator frameworks

    • omap_device_enable(pdev)

    • omap_device_idle(pdev)

    • omap_device_shutdown(pdev)

  • Target RFC submission by end June - Discussions on w. Power management teams


Wb pipeline
WB Pipeline

  • Write-back pipeline (WB) allows to take benefit of the HW processing available inside the DISPC like color space conversion, re-scaling, compositing to perform memory to memory transfer with data processing or capturing a displayed frame

  • WB can be fed by either the pipelines or overlay manager; Sample use cases are:

    • Fed by pipelines: To support higher scaling

    • Fed by overlay manager : Display and record the displayed content

  • Two options are being analyzed for introducing WB in kernel

    • WB as an overlay object

    • WB as new entity (functioning both as a manager and an overlay); currently being prototyped

  • Target RFC submission is mid July


Picodlp
PicoDLP

  • PicoDLP is multiplexed with DSI2 / secondary LCD

  • A panel driver, which will interface with DPI for data path and I2C for command interface

  • RFC is planned in 4Q 2010

  • Functional patches exist


Other omap4 features
Other OMAP4 Features

  • TILER support: OMAP4 replacement for OMAP3 VRFB for rotation & mirroring

  • ARGB32 format

  • All VID pipelines have identical features supported

    • OMAP3 VID1 has lesser features as compared to VID2

  • 1080P related changes


Pending work on omap3
Pending Work on OMAP3

  • Submitted patches, rework in progress

    • NEC panel support

    • Enabling display in the Zoom2/3, 3630 SDP board files

    • Enable Pre-Multiplied Alpha Support

  • Enable V4L2 on Zoom2/3 & 3630 SDP boards

  • DMA optimization using scaler line buffers

  • Support for 6 VRFB buffers

  • Enable TV detection support


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