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This article introduces you how to configure and debug RK3288 HDMI, the content is very detailed, interested friends can refer to, hope to be helpful to you.

The maximum output resolution of RK3288 is 3840x2160

The HDMI driver code is located in the kernel/drivers/video/rockchip/hdmi/rockchip-hdmiv2 directory

1. Set the default output resolution

The resource on the Internet is to modify the rockchip-hdmi.h file in kernel/drivers/video/rockchip/hdmi/rockchip-hdmiv2.

/ * HDMI default vide mode * /

# define HDMI_VIDEO_DEFAULT_MODE HDMI_1280X720P_60HZ

The official document is to modify the board-level dts file, the path is kernel\ arch\ arm\ boot\ dts\ xxx.dts

Add rockchip,defaultmode = to the hdmi node, and the value can be found in the hdmi_video_infomation_code of rockchip-hdmi.h.

Hdmi_video_infomation_code is an enumerated array, starting from 1, which resolution you want to set, the value value will fill in the serial number of that resolution.

This resolution must be supported before setting it. View supported resolutions: cat / sys/class/display/HDMI/modes

For example, set the default resolution to 1280x720P60Hz output:

/ / path: kernel\ arch\ arm\ boot\ dts\ xxx.dts

& hdmi {

Status = "okay"

Rockchip,hdmi_video_source =

Rockchip,defaultmode =

}

/ / path: kernel\ drivers\ video\ rockchip\ hdmi\ rockchip-hdmi.h

/ * HDMI video information code according CEA-861-F * /

Enum hdmi_video_infomation_code {

HDMI_640X480P_60HZ = 1

HDMI_720X480P_60HZ_4_3

HDMI_720X480P_60HZ_16_9

HDMI_1280X720P_60HZ

...

}

2. Debugging method

View the EDID information of the sink device, including raw data and parsed information.

Cat / sys/class/display/HDMI/debug

Shell@xxx:/ $cat / sys/class/display/HDMI/debug

/ / EDID status

EDID status:Okay

/ / original data

Raw Data:

0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x05, 0xe3, 0x80, 0x22, 0xfd, 0x05, 0x00, 0x00

0x0e, 0x1a, 0x01, 0x03, 0xa0, 0x30, 0x1b, 0x78, 0xba, 0x5a, 0x65, 0xa7, 0x56, 0x52, 0x9c, 0x27

0x0f, 0x50, 0x54, 0xbf, 0xef, 0x00, 0xd1, 0xc0, 0xb3, 0x00, 0x95, 0x00, 0x81, 0x80, 0x81, 0x40

0x81, 0xc0, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c

0x45, 0x00, 0xdd, 0x0c, 0x11, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x32, 0x4c, 0x1e

0x53, 0x11, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x32

0x32, 0x38, 0x30, 0x57, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xff

0x00, 0x41, 0x42, 0x38, 0x30, 0x36, 0x31, 0x34, 0x5a, 0x30, 0x31, 0x35, 0x33, 0x33, 0x01, 0xa8

0x02, 0x03, 0x1b, 0x71, 0x23, 0x09, 0x07, 0x07, 0x83, 0x01, 0x00, 0x00, 0x67, 0x03, 0x0c, 0x00

0x10, 0x00, 0x80, 0x21, 0x43, 0x01, 0x10, 0x84, 0xe2, 0x00, 0x0f, 0x01, 0x1d, 0x00, 0x72, 0x51

0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, 0x81, 0x49, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00

0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xbf

* Show Sink Info *

/ / maximum tmds channel clock frequency

Max tmds clk is 0

/ / supported resolution

Support video mode:

1920x1080p@60Hz

1280x720p@60Hz

/ / supported video color mode

Support video color mode: RGB YCbCr422 YCbCr444

/ / supported video color bit depth

Support video color depth: 24bit

/ / supported audio types

Support audio type: LPCM

/ / the largest audio channel supported

Support max audio channel is 2

/ / supported audio sampling rate

Support audio sample rate: 32000 44100 48000

/ / supported audio word length

Support audio word lenght: 16bit 20bit 24bit

View supported resolutions

$cat / sys/class/display/HDMI/modes

View current resolution

$cat / sys/class/display/HDMI/mode

Toggle resolution

$echo 1920x1080p-60 > / sys/class/display/HDMI/mode

Check if HDMI is connected

$cat / sys/class/display/HDMI/connect

View HDMI enable statu

$cat / sys/class/display/HDMI/enable

Set HDMI to enable. 0 or 1 is preferred. 0 means off and 1 means on.

$echo > / sys/class/display/HDMI/enable

Modify output color

$echo mode= > / sys/class/display/HDMI/color

Mode = 0 is the automatic mode, and the priority is:

YCbCr444 > YCbCr422 > RGB > RGB

Mode = 1 is RGB [0255]

Mode = 2 is RGB [16-235]

Mode = 3 is YCbCr444 [16-235]

Mode = 4 is YCbCr422 [16-235]

View 3D mode

$cat / sys/class/display/HDMI/3dmode

Set 3D mode

$echo > / sys/class/display/HDMI/3dmode

You can take the following values:

0:Frame packing

6:Top and Bottom

8:Side by Side Half

Open the kernel Debug option in make menuconfig to see more Log information.

Device Drivers->

Graphics support->

[*] Rockchip HDMI support->

[*] Rockchip HDMI Debugging

On how to configure and debug RK3288 HDMI to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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