ZynqMP DisplayPort Linux driver
This page gives an overview of the DisplayPort driver which is available as part of the ZynqMP Linux distribution. The main driver is based on the Linux DRM KMS display subsystem. Additional drivers are based on other systems: DMA engine driver for DPDMA and ALSA driver for audio support.
Paths, files, links and documentation on this page are given relative to the Linux kernel source tree.
For information on the underlying hardware, see UG1085.
Table of Contents
HW IP features
Features in bold are supported by the driver- Based on the VESA DisplayPort V.12a source-only specification.
- Video support for the following:
° Resolution up to 4K x 2K at 30Fps.
° Y-only, YCbCr444, YCbCr422, YCbCr420, and RGB video formats.
° 6, 8, 10, or 12 bits per color components.
° Progressive video.
° A 36-bit native video input interface to capture live video.
° Non-live video from frame buffers using internal DPDMA. - Graphics support for the following:
° Non-live graphics from the frame buffer.
° 36-bit native video interface along with an 8-bit alpha channel to capture live graphics.
° 2-plane, on-the-fly rendering of video and graphics.
° Chroma upsampling.
° Chroma downsampling.
° Color space conversion from YCbCr to RGB and vice versa.
° Video blending.
° Chroma keying. - Audio support for the following:
° Up to two audio channels.
° Sample size of up to 24 bits.
° Maximum sample rate of 48 KHz.
° Live 24-bit audio from the PL.
° Non-live 16-bit audio from the frame buffer. - Audio mixer and volume control.
° Mixing of two audio streams of the same sampling rate and channel count.
° Provides gain control for audio streams. - Streaming A/V output back to the PL.
- Includes a system time clock (STC) that is compliant with the ISO/IEC 13818-1 standard. Provides time stamping of the A/V presentation unit.
Missing Features, Known Issues and Limitations
Missing Features
This section summarizes the known issues and missing features (or experimental)- Live support is experimental feature
- Live input is supported as experimental (live input)
- Live output hasn't been fully verified
- Pixel formats
- 12 bit YUV formats are not supported
- Interop
- Some monitor may not sync reliably. Please refer to ZU+ supported monitors
Limitation
- Both layers (drm planes) should be in the same size. Otherwise, if the requested size is different, the driver returns an error. This is hardware limitation.
Important AR links
Note
The driver implementation has switched to the new driver in 2018.1, which supports new software features with more modular / scalable structure. The behavior of some APIs may be different, as well as the driver name from "xilinx_drm" to "xlnx".Kernel Configuration
The dedicated DMA engine for DisplayPort should be enabled.
CONFIG_XILINX_DPDMA=y
The following config options are optional and required for audio support.
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_SOC=y
CONFIG_SND_SOC_XILINX_DP=y
The driver, as some other multimedia drivers, needs CMA chunk. The following config options are recommended.
CONFIG_CMA=y
CONFIG_DMA_CMA=y
CONFIG_CMA_SIZE_MBYTES=256
The below is for new driver (>= 2018.1)
The following config options should be enabled in order to build the DisplayPort driver
CONFIG_DRM_XLNX=y
CONFIG_DRM_XLNX_BRIDGE=y
CONFIG_DRM_XLNX_BRIDGE_DEBUG_FS=y
CONFIG_DRM_ZYNQMP_DPSUB=y
The below is for old driver (< 2018.1)
The following config options should be enabled in order to build the DisplayPort driver
CONFIG_DRM=y
CONFIG_DRM_XILINX=y
CONFIG_DRM_XILINX_DP=y
CONFIG_DRM_XILINX_DP_SUB=y
Devicetree
The below is for new driver (>= 2018.1)The snippet:
- zynqmp-display: zynqmp-display
The dt binding doc: Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.txt
- xlnx,zynqmp-dpsub.txt
The below is for old driver (< 2018.1)
Device tree nodes required are as below in "arch/arm64/boot/dts/xilinx/zynqmp.dtsi"
- Xilinx drm: xilinx drm node
- dp: dp
- dp subsystem: dp_sub
- dpdma: dpdma
For audio support
- alsa nodes: card, codec, pcm
For more details, Please refer to "Documentation/devicetree/bindings/drm/xilinx"
- dp.txt
- dp_sub.txt
- xilinx_drm.txt
Implementation
Power Management
The display pipeline is enabled and disabled upon the monitor HPD (hot plug detect) events. When there's disconnect event the DRM framework disables the pipeline. For the connect event the pipeline is enabled. The detect callback below from DP driver reports the connection status. This management is called DPMS (Display Power Management Signaling).static enum drm_connector_status zynqmp_dp_connector_detect(struct drm_connector *connector, bool force) { if () { .... return connector_status_connected; } disconnected: return connector_status_disconnected; }
Upon the event, the DRM framework enables and disables the pipeline if possible. The below, the drm_kms_helper_hotplug_event() will disable or enable the fb console based on the event type.
bool drm_helper_hpd_irq_event(struct drm_device *dev) { ... connector->status = drm_helper_probe_detect(connector, NULL, false); .... if (changed) drm_kms_helper_hotplug_event(dev); return changed; } EXPORT_SYMBOL(drm_helper_hpd_irq_event);
void drm_kms_helper_hotplug_event(struct drm_device *dev) { /* send a uevent + call fbdev */ drm_sysfs_hotplug_event(dev); if (dev->mode_config.funcs->output_poll_changed) dev->mode_config.funcs->output_poll_changed(dev); } EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
https://github.com/Xilinx/meta-petalinux/blob/4e84d60865bf505d1ea425f3e5c84e37bf8f7455/recipes-core/udev/eudev/monitor-hotplug.sh
#!/bin/sh #Adapt this script to your needs. DEVICES=$(find /sys/class/drm/*/status) #inspired by /etc/acpd/lid.sh and the function it sources displaynum=`ls /tmp/.X11-unix/* | sed s#/tmp/.X11-unix/X##` display=":$displaynum.0" export DISPLAY=":$displaynum.0" # from https://wiki.archlinux.org/index.php/Acpid#Laptop_Monitor_Power_Off export XAUTHORITY=$(ps -C Xorg -f --no-header | sed -n 's/.*-auth //; s/ -[^ ].*//; p') for i in /sys/class/drm/*/*/status ; do status=$(cat $i); connector=${i%/status*}; connector=${connector#*-}; if [ "$status" == "disconnected" ]; then xset dpms force off elif [ "$status" == "connected" ]; then xset dpms force on if [ "$(xrandr | grep '\*')" = "" ]; then xrandr --output $connector --auto fi fi done
static void zynqmp_disp_crtc_atomic_enable(struct drm_crtc *crtc, struct drm_crtc_state *old_crtc_state) { ... pm_runtime_get_sync(disp->dev); ret = zynqmp_disp_clk_enable(disp->pclk, &disp->pclk_en); if (ret) { dev_err(disp->dev, "failed to enable a pixel clock\n"); return; } ... zynqmp_disp_enable(disp); ... }
static void zynqmp_disp_crtc_atomic_disable(struct drm_crtc *crtc, struct drm_crtc_state *old_crtc_state) { ... zynqmp_disp_clk_disable(disp->pclk, &disp->pclk_en); zynqmp_disp_plane_disable(crtc->primary); zynqmp_disp_disable(disp, true); pm_runtime_put_sync(disp->dev); }
static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder) { ... pm_runtime_get_sync(dp->dev); dp->enabled = true; zynqmp_dp_init_aux(dp); ... if (zynqmp_disp_aud_enabled(dp->dpsub->disp)) zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); zynqmp_dp_write(iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0); if (dp->status == connector_status_connected) { for (i = 0; i < 3; i++) { ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0); if (ret == 1) break; usleep_range(300, 500); } /* Some monitors take time to wake up properly */ msleep(zynqmp_dp_power_on_delay_ms); } ... zynqmp_dp_write(iomem, ZYNQMP_DP_TX_SW_RESET, ZYNQMP_DP_TX_SW_RESET_ALL); zynqmp_dp_write(iomem, ZYNQMP_DP_TX_ENABLE_MAIN_STREAM, 1); }
static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder) { ... zynqmp_dp_write(iomem, ZYNQMP_DP_TX_ENABLE_MAIN_STREAM, 0); drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3); zynqmp_dp_write(iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN, ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); if (zynqmp_disp_aud_enabled(dp->dpsub->disp)) zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CONTROL, 0); pm_runtime_put_sync(dp->dev); }
static int __maybe_unused xlnx_pm_suspend(struct device *dev) { struct xlnx_drm *xlnx_drm = dev_get_drvdata(dev); struct drm_device *drm = xlnx_drm->drm; drm_kms_helper_poll_disable(drm); xlnx_drm->suspend_state = drm_atomic_helper_suspend(drm); if (IS_ERR(xlnx_drm->suspend_state)) { drm_kms_helper_poll_enable(drm); return PTR_ERR(xlnx_drm->suspend_state); } return 0; } static int __maybe_unused xlnx_pm_resume(struct device *dev) { struct xlnx_drm *xlnx_drm = dev_get_drvdata(dev); struct drm_device *drm = xlnx_drm->drm; drm_atomic_helper_resume(drm, xlnx_drm->suspend_state); drm_kms_helper_poll_enable(drm); return 0; }
Applications
This section describes the example commands in drm or Xorg environment.DRM
modetest is the test application available from libdrm: https://cgit.freedesktop.org/mesa/drm/tree/tests/modetest.For information on boot args see Xilinx DRM KMS related bootargs.
The below is the help from the application. Please note, some arguments / commands changes.
Running the modetest with driver id string lists available modes / properties from the connected monitor. Please note the IDs are not fixed and changes due to framework updates or so.
Please note, the driver name has been changed to xlnx for release >= 2018.1. For release <= 2017.4, the ID is 'xilinx_drm'. Alternatively, the bus id can be used with '-D' option. The bus id is the device specific id to differentiate between devices under same drm driver. The bus id can be found by cat /sys/kerne/debug/dri/0/name. The bus id for ZynqMP DP is 'fd4a0000.zynqmp-display'. The value should be set differently for each device.
To set the test pattern on the crtc, 'RG16' can be replaced with any other format from primary plane (plane@35).
To enable the overlay plane, use '-P' with arguments below. 'YUYV' can be replaced with any other format from overlay plane (plane@34).
plane@34 wouldn't be visible as plane@35 is always on top. Set the alpha property using '-w'.
The modetest also demonstrates the page flipping with '-v' option. The command flips two buffers and prints the framerate.
Enabling The Zynq MPSoC DisplayPort Controller internal TPG via modetest.
NOTE: that the TPG command below should only be used before running modetest -P.
The live input can be configured through Xilinx bridge interface (https://github.com/xilinx//linux-xlnx/blob/xilinx-v2018.2/drivers/gpu/drm/xlnx/xlnx_bridge.h#L65), which is the kernel level APIs. The APIs can be used directly by the client driver, ex V4L TPG driver. The interface is also available through debugfs for userspace application to control, as this feature is experimental stage as of 2018.2 release.
The live input requires the clock and timing to be generated from PL, so that such requirement should be reflected in the PL design. The clock should be specified in the devicetree, with 'dp_live_video_in_clk' (http://github.com/xilinx/linux-xlnx/blob/xilinx-v2018.2/Documentation/devicetree/bindings/display/xlnx/xlnx%2Czynqmp-dpsub.txt#L20). The driver will automatically switches to PL clock when switching to live input. The DT binding doc describes as below.
As an example, if the si570 is connected to DP live clock through FPGA logic, the DT change is as below.
There are two live inputs available, video and graphics, and two debugfs entries are available.
Some operations can be done through debugfs: enable / disable / set_input:
http://github.com/xilinx/linux-xlnx/blob/xilinx-v2018.2/drivers/gpu/drm/xlnx/xlnx_bridge.c#L310. But please note, debugfs is not treated as stable ABI, so any application shouldn't rely on specific ABI, meaning it may change from one version to another.
The below command will set video layer to use live input.
For 'set_input', 1st arg = width, 2nd arg = height, 3rd arg = media bus format (from media-bus-format.h). 0x100e maps to RGB24 (
http://github.com/xilinx/linux-xlnx/blob/xilinx-v2018.2/include/uapi/linux/media-bus-format.h#L49)
This assumes that the logic connected to live input (ex, TPG / VTC) are already configured prior to enable command. Then the live input can be disabled as below.
Xorg clients look for the env variable to find corresponding server. Thus export before running clients from serial console.
Run window manager and desktop session (matchbox example).
'xrandr' is to display and change the resolutions.
The below is the help from the application. Please note, some arguments / commands changes.
root@xilinx-zcu106-zu7-es2-2018_1:~# modetest --help usage: modetest [-cDdefMPpsCvw] Query options: -c list connectors -e list encoders -f list framebuffers -p list CRTCs and planes (pipes) Test options: -P <plane_id>@<crtc_id>:<w>x<h>[+<x>+<y>][*<scale>][@<format>] set a plane -s <connector_id>[,<connector_id>][@<crtc_id>]:<mode>[-<vrefresh>][@<format>] set a mode -C test hw cursor -v test vsynced page flipping -w <obj_id>:<prop_name>:<value> set property Generic options: -d drop master after mode set -M module use the given driver -D device use the given device Default is to dump all info.
Running the modetest with driver id string lists available modes / properties from the connected monitor. Please note the IDs are not fixed and changes due to framework updates or so.
- Available modes under connector@38
- Current framebuffer set to crtc@36
- Available planes (layers): plane@34 and plane@35
- List of supported formats for each plane
- Alpha properties of plane@35
Please note, the driver name has been changed to xlnx for release >= 2018.1. For release <= 2017.4, the ID is 'xilinx_drm'. Alternatively, the bus id can be used with '-D' option. The bus id is the device specific id to differentiate between devices under same drm driver. The bus id can be found by cat /sys/kerne/debug/dri/0/name. The bus id for ZynqMP DP is 'fd4a0000.zynqmp-display'. The value should be set differently for each device.
root@xilinx-zcu106-zu7-es2-2018_1:~# modetest -M xlnx Encoders: id crtc type possible crtcs possible clones 37 36 TMDS 0x00000001 0x00000000 Connectors: id encoder status name size (mm) modes encoders 38 37 connected DP-1 530x300 29 37 modes: name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot) 3840x2160 30 3840 3888 3920 4000 2160 2163 2168 2191 262750 flags: phsync, nvsync; type: driver 2560x1440 60 2560 2608 2640 2720 1440 1443 1448 1481 241500 flags: phsync, nvsync; type: driver 2048x1280 60 2048 2192 2416 2784 1280 1281 1284 1325 221277 flags: nhsync, pvsync; type: 1920x1200 60 1920 2056 2256 2592 1200 1203 1209 1245 193250 flags: nhsync, pvsync; type: driver 1920x1080 60 1920 2008 2052 2200 1080 1082 1087 1125 148500 flags: phsync, pvsync; type: driver 1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver 1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 148352 flags: phsync, pvsync; type: driver 1920x1080 50 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver 1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74250 flags: phsync, pvsync; type: driver 1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 74176 flags: phsync, pvsync; type: driver 1600x1200 60 1600 1664 1856 2160 1200 1201 1204 1250 162000 flags: phsync, pvsync; type: driver 1600x900 60 1600 1624 1704 1800 900 901 904 1000 108000 flags: phsync, pvsync; type: driver 1280x1024 75 1280 1296 1440 1688 1024 1025 1028 1066 135000 flags: phsync, pvsync; type: driver 1280x1024 60 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver 1152x864 75 1152 1216 1344 1600 864 865 868 900 108000 flags: phsync, pvsync; type: driver 1280x720 60 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver 1280x720 60 1280 1390 1430 1650 720 725 730 750 74176 flags: phsync, pvsync; type: driver 1280x720 50 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver 1024x768 75 1024 1040 1136 1312 768 769 772 800 78750 flags: phsync, pvsync; type: driver 1024x768 60 1024 1048 1184 1344 768 771 777 806 65000 flags: nhsync, nvsync; type: driver 800x600 75 800 816 896 1056 600 601 604 625 49500 flags: phsync, pvsync; type: driver 800x600 60 800 840 968 1056 600 601 605 628 40000 flags: phsync, pvsync; type: driver 720x576 50 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver 720x480 60 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver 720x480 60 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver 640x480 75 640 656 720 840 480 481 484 500 31500 flags: nhsync, nvsync; type: driver 640x480 60 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver 640x480 60 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver 720x400 70 720 738 846 900 400 412 414 449 28320 flags: nhsync, pvsync; type: driver props: 1 EDID: flags: immutable blob blobs: value: 00ffffffffffff0010acbea04c433930 171a0104a5351e783ae245a8554da326 0b5054a54b00714f8180a9c0a940d1c0 e100d10001014dd000a0f0703e803e30 35000f282100001a000000ff00473344 37463636313039434c0a000000fc0044 454c4c205032343135510a20000000fd 001d4c1e8c36000a2020202020200135 02031df150101f200514041312110302 161507060123091f0783010000565e00 a0a0a02950302035000f282100001a02 3a801871382d40582c25000f28210000 1e011d007251d01e206e2855000f2821 00001ea36600a0f0701f80302035000f 282100001a0000000000000000000000 000000000000000000000000000000eb 2 DPMS: flags: enum enums: On=0 Standby=1 Suspend=2 Off=3 value: 0 5 link-status: flags: enum enums: Good=0 Bad=1 value: 0 39 sync: flags: range values: 0 1 value: 0 40 bpc: flags: enum enums: 6BPC=6 8BPC=8 10BPC=10 12BPC=12 value: 8 CRTCs: id fb pos size 36 64 (0,0) (3840x2160) 3840x2160 30 3840 3888 3920 4000 2160 2163 2168 2191 262750 flags: phsync, nvsync; type: driver props: 29 output_color: flags: enum enums: rgb=0 ycrcb444=1 ycrcb422=2 yonly=3 value: 0 30 bg_c0: flags: range values: 0 4095 value: 0 31 bg_c1: flags: range values: 0 4095 value: 0 32 bg_c2: flags: range values: 0 4095 value: 0 Planes: id crtc fb CRTC x,y x,y gamma size possible crtcs 34 0 0 0,0 0,0 0 0x00000001 formats: VYUY UYVY YUYV YVYU YU16 YV16 YU24 YV24 NV16 NV61 BG24 RG24 XB24 XR24 XB30 XR30 YU12 YV12 NV12 NV21 XV15 XV20 props: 6 type: flags: immutable enum enums: Overlay=0 Primary=1 Cursor=2 value: 0 33 tpg: flags: range values: 0 1 value: 0 35 36 64 0,0 0,0 0 0x00000001 formats: AB24 AR24 RA24 BA24 BG24 RG24 RA15 BA15 RA12 BA12 RG16 BG16 props: 6 type: flags: immutable enum enums: Overlay=0 Primary=1 Cursor=2 value: 1 27 alpha: flags: range values: 0 255 value: 255 28 g_alpha_en: flags: range values: 0 1 value: 1 Frame buffers: id size pitch
To set the test pattern on the crtc, 'RG16' can be replaced with any other format from primary plane (plane@35).
root@xilinx-zcu106-zu7-es2-2018_1:~# modetest -M xlnx -s 38:1920x1080@RG16 setting mode 1920x1080-60Hz@RG16 on connectors 38, crtc 36
root@xilinx-zcu106-zu7-es2-2018_1:~# modetest -M xlnx -s 38:1920x1080@RG16 -P 34@36:1920x1080@YUYV setting mode 1920x1080-60Hz@RG16 on connectors 38, crtc 36 testing 1920x1080@YUYV overlay plane 34
root@xilinx-zcu106-zu7-es2-2018_1:~# modetest -M xlnx -s 38:1920x1080@RG16 -P 34@36:1920x1080@YUYV -w 35:alpha:100 setting mode 1920x1080-60Hz@RG16 on connectors 38, crtc 36 testing 1920x1080@YUYV overlay plane 34
root@xilinx-zcu106-zu7-es2-2018_1:~# modetest -M xlnx -s 38:1920x1080@RG16 -P 34@36:1920x1080@YUYV -w 35:alpha:100 -v setting mode 1920x1080-60Hz@RG16 on connectors 38, crtc 36 testing 1920x1080@YUYV overlay plane 34 freq: 60.10Hz freq: 59.99Hz
NOTE: that the TPG command below should only be used before running modetest -P.
modetest -D fd4a0000.zynqmp-display -w 34:tpg:1 -w 35:alpha:100
Live Input
The live input can be configured through Xilinx bridge interface (https://github.com/xilinx//linux-xlnx/blob/xilinx-v2018.2/drivers/gpu/drm/xlnx/xlnx_bridge.h#L65), which is the kernel level APIs. The APIs can be used directly by the client driver, ex V4L TPG driver. The interface is also available through debugfs for userspace application to control, as this feature is experimental stage as of 2018.2 release.
The live input requires the clock and timing to be generated from PL, so that such requirement should be reflected in the PL design. The clock should be specified in the devicetree, with 'dp_live_video_in_clk' (http://github.com/xilinx/linux-xlnx/blob/xilinx-v2018.2/Documentation/devicetree/bindings/display/xlnx/xlnx%2Czynqmp-dpsub.txt#L20). The driver will automatically switches to PL clock when switching to live input. The DT binding doc describes as below.
- clocks: phandles for axi, audio, non-live video, and live video clocks. axi clock is required. Audio clock is optional. If not present, audio will be disabled. One of non-live or live video clock should be present. - clock-names: The identification strings are required. "aclk" for axi clock. "dp_aud_clk" for audio clock. "dp_vtc_pixel_clk_in" for non-live video clock. "dp_live_video_in_clk" for live video clock (clock from programmable logic).
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi index a02ad79..dd747d0 100644 --- a/arch/arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi +++ b/arch/arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi @@ -272,7 +272,7 @@ }; &zynqmp_dpsub { - clocks = <&dp_aclk>, <&clk 17>, <&clk 16>; + clocks = <&dp_aclk>, <&clk 17>, <&clk 16>, <&si570_1>; }; &xlnx_dpdma { diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi index fb196a1..acd7cf2 100644 --- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi +++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi @@ -1151,7 +1151,8 @@ interrupt-parent = <&gic>; clock-names = "dp_apb_clk", "dp_aud_clk", - "dp_vtc_pixel_clk_in"; + "dp_vtc_pixel_clk_in", + "dp_live_video_in_clk"; power-domains = <&pd_dp>;
/sys/kernel/debug/xlnx-bridge/xlnx_bridge-vid-layer /sys/kernel/debug/xlnx-bridge/xlnx_bridge-gfx-layer
http://github.com/xilinx/linux-xlnx/blob/xilinx-v2018.2/drivers/gpu/drm/xlnx/xlnx_bridge.c#L310. But please note, debugfs is not treated as stable ABI, so any application shouldn't rely on specific ABI, meaning it may change from one version to another.
The below command will set video layer to use live input.
echo "set_input 1920 1080 0x100e" > /sys/kernel/debug/xlnx-bridge/xlnx_bridge-vid-layer echo "enable" > /sys/kernel/debug/xlnx-bridge/xlnx_bridge-vid-layer
http://github.com/xilinx/linux-xlnx/blob/xilinx-v2018.2/include/uapi/linux/media-bus-format.h#L49)
This assumes that the logic connected to live input (ex, TPG / VTC) are already configured prior to enable command. Then the live input can be disabled as below.
echo "disable" > /sys/kernel/debug/xlnx-bridge/xlnx_bridge-vid-layer
ALSA
The "aplay" is an ALSA (Linux audio/sound subsystem) example and demonstrates the audio play. The command sends audio data on specific pcm channel which is audible at DPout.aplay test.wav -d 30 -D hw:0,0 ,For PCM0 aplay test.was -d 30 -D hw:0,1 ,For PCM1
Xorg
Xorg automatically launches at boot up. If needed to run manually,Xorg&
export DISPLAY=:0.0
matchbox-window-manager& matchbox-session&
root@plnx_aarch64:~# xrandr Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 4096 x 4096 DP-1 connected 3840x2160+0+0 953mm x 543mm 3840x2160 29.98* 2560x1600 59.97 1920x1080 60.00 50.00 59.94 1680x1050 59.95 1280x1024 75.02 60.02 1440x900 74.98 59.89 1280x960 60.00 1366x768 59.79 1280x720 60.00 50.00 59.94 1024x768 75.03 60.00 800x600 75.00 60.32 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 66.67 60.00 59.94 720x400 70.08 root@plnx_aarch64:~# xrandr -s 1920x1080 root@plnx_aarch64:~# xrandr -s 640x480
'xset' changes some setting. Change of power states can be done as below.
root@plnx_aarch64:~# sleep 1; xset dpms force on #Sleep adds a delay to help X from getting confused on the order of events root@plnx_aarch64:~# sleep 1; xset dmps force off
Disable Xorg Timeouts
The default settings for Xorg may cause the screen to go black after a 10 minute timeout. The user can disable these in their xorg.conf file using "ServerFlasgs" options as follows.
/etc/X11/xorg.conf
Section "InputDevice" Identifier "System Mouse" Driver "mouse" Option "Device" "/dev/input/mouse0" EndSection Section "InputDevice" Identifier "System Keyboard" Driver "kbd" Option "Device" "/dev/input/event0" EndSection Section "Device" Identifier "ZynqMP" Driver "armsoc" Option "DRI2" "true" Option "DRI2_PAGE_FLIP" "false" Option "DRI2_WAIT_VSYNC" "true" Option "SWcursorLCD" "false" Option "DEBUG" "false" EndSection Section "Screen" Identifier "DefaultScreen" Device "ZynqMP" DefaultDepth 16 EndSection Section "ServerFlags" Option "BlankTime" "0" Option "StandbyTime" "0" Option "SuspendTime" "0" Option "OffTime" "0" EndSection
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