HDMI PHY Auto Setting using modeline information

If you have information of your monitor's modeline information, hdmi driver builds up the hdmi-related parameters based on the parameter described in boot.ini.

The required items are as following.

1. Resolutions and Clock
    - horizontal pixels / vertical pixels
    - pixel clock
    - horizontal frequency / vertical frequency
2. HTimings
    - hdisp / hsyncstart / hsyncend / htotal
3. VTimings
    - vdisp / vsyncstart / vsyncend / vtotal
4. Sync Polarity and Scanning Method
    - hsync_polarity / vsync_polarity
    - progress_mode or interlaced mode

Let's talk about the detailed descriptions and examples of modeline information here.

* Resolutions and Clock

* HTimings

* VTimings

* Sync Polarity and Scanning Method

The formats of modeline can be as following.

1. Modeline Syntax (1)

Modeline "width x height" pclk hdisp hsyncstart hsyncend htotal vdisp vsyncstart vsyncend vtotal [flags]

For example, in case of 1920x1080p60Hz,

1920 1080 60 Hz 67.5 kHz ModeLine "1920x1080" 148.50 1920 2008 2052 2200 1080 1084 1088 1125 -HSync -VSync

2. Modeline Syntax (2)

 [width x height]   [pixel clock in MHz] [hsync_polarity] [vsync_polarity]
        h: width  [width] start [hsyncstart] end [hsyncend] total [htotal] skew    0 clock   [hor_freq in KHz]
        v: height [height] start [vsyncstart] end [vsyncend] total [vtotal]                clock  [ver_freq in Hz]

* Example - 1920x1080p60Hz case

 1920x1080   148.5MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
        v: height 1080 start 1084 end 1089 total 1125                clock   60.0Hz

* Example - 1792x1344p60Hz case

 1792x1344   204.80MHz -HSync +VSync
        h: width  1792 start 1920 end 2120 total 2448 skew    0 clock  83.66KHz
        v: height 1344 start 1345 end 1348 total 1394                clock   60.0Hz

If you have a linux pc, you can get the modeline information using the command, 'xrandr'.

$ xrandr
Screen 0: minimum 320 x 200, current 5120 x 1600, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
.....
DFP6 connected primary 2560x1440+2560+160 (normal left inverted right x axis y axis) 596mm x 335mm
   2560x1440      60.0*+
   1856x1392      60.0  
   1792x1344      60.0  
   1920x1200      60.0  
   .....
   640x480        66.6     59.9  
DFP7 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 641mm x 401mm
   2560x1600      60.0*+
   2048x1536      60.0  
   .....
   640x480        59.9  
CRT1 disconnected (normal left inverted right x axis y axis)

$ xrandr --verbose
Screen 0: minimum 320 x 200, current 5120 x 1600, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x75
	Timestamp:  24992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3 4 5
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	SignalFormat: DisplayPort 
	ConnectorType: DisplayPort 
.....
.....
  2560x1440 (0x7d)  241.5MHz +HSync +VSync *current +preferred
        h: width  2560 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1440 start 1442 end 1447 total 1481           clock   60.0Hz
  1800x1440 (0x7e)  241.5MHz +HSync +VSync
        h: width  1800 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1440 start 1442 end 1447 total 1481           clock   60.0Hz
  1856x1392 (0x7f)  241.5MHz +HSync +VSync
        h: width  1856 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1392 start 1442 end 1447 total 1481           clock   60.0Hz
  1792x1344 (0x80)  241.5MHz +HSync +VSync
        h: width  1792 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1344 start 1442 end 1447 total 1481           clock   60.0Hz
.....
  640x480 (0x97)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   59.9Hz
.....

TODO

# setenv hdmimode "1080p60hz"
setenv hdmimode "custombuilt"

The basic form of related env parameter in boot.ini is as following.

setenv modeline horpixels,verpixels,pixel_clock,hor_freq,ver_freq,hdisp,hsyncstart,hsyncend,htotal,vdisp,vsyncstart,vsyncend,vtotal,hsync_polarity,vsync_polarity,progress_mode

For Android, “customwidth” and “customheight” parameters are needed.

setenv customwidth horpixels
setenv customheight verpixels

For example, let's suppose we're building 1920x1080p60Hz mode.

setenv modeline "1920,1080,148500,67500,60,1920,2008,2052,2200,1080,1084,1088,1125,0,1,1"

# Only for Android
setenv customwidth "1920"
setenv customheight "1080"

For another example of 1792x1344p60Hz mode, the env configuration should be as following.

setenv modeline "1792,1344,204800,83660,60,1792,1920,2120,2448,1344,1345,1348,1394,0,1,1"

# Only for Android
setenv customwidth "1792"
setenv customheight "1344"

For Android, here is a example in case of 1792x1344p60Hz.

boot.ini

ODROIDC2-UBOOT-CONFIG
 
setenv dtbaddr 0x1000000
setenv loadaddr 0x20000000
 
# Resolution Configuration
# 'hdmimode' must be one of below to configure display resolution within
# supported by your TV or monitor.
#    Symbol             | Resolution
# ----------------------+-------------
#    "480p60hz"         | 720x480 Progressive 60Hz
#    .....
#    "3440x1440p60hz"   | 3440x1440 Progressive 60Hz
setenv hdmimode "custombuilt"
 
# modeline for 1792x1344p60Hz                     
setenv modeline "1792,1344,204800,83660,60,1792,1920,2120,2448,1344,1345,1348,1394,0,1,1"
setenv customwidth "1792"                          
setenv customheight "1344"                          
 
setenv rootopt "root=/dev/mmcblk0p2 rw init=/init rootwait"
setenv consoleopt "console=ttyS0,115200"
setenv androidopt "androidboot.hardware=odroidc2 androidboot.serialno=${fbt_id#}"
setenv logoopt "osd1,loaded,${fb_addr},${hdmimode}"
setenv selinuxopt "androidboot.selinux=disabled"
 
# HDMI/DVI Mode Configuration
# This will enforce the signal type of display
# "hdmi" - For HDMI interface
# "dvi" - For DVI interface
setenv vout_mode "hdmi"
 
# HPD enable/disable option
setenv disablehpd "false"
 
# Overscan offset configuration
# All offsets are zero and can be tuned by manual or ODROID Utility
setenv overscan_top "0"
setenv overscan_left "0"
setenv overscan_bottom "0"
setenv overscan_right "0"
suspend_hdmiphy=0
led_blink=1
 
setenv bootargs "${rootopt} ${consoleopt} modeline=${modeline} hdmimode=${hdmimode} hdmitx=${cecconfig} vout=${vout_mode} disablehpd=${disablehpd} logo=${logoopt} ${androidopt} ${selinuxopt} suspend_hdmiphy=${suspend_hdmiphy} led_blink=${led_blink}"
 
save                                               
 
showlogo ${hdmimode}                                
#usb pwren                                          
 
movi read dtb 0 ${dtbaddr}                          
movi read boot 0 ${loadaddr}                        
booti ${loadaddr} - ${dtbaddr}