Difference between revisions of "Rock/Hdmi Resolution"

Revision as of 07:21, 1 June 2015

Note:

1) the method is suit for rock pro, rock lite & rock2 square

2) the method is suit for Android & Linux

Step 1: Get the EDID parameter by tools

Note: There is just tool under windows, we will provide tool under linux Later

1) Download the tools here: http://dl.radxa.com/users/yao/sm_setup.exe

2 )Install sm_setup.exe, then run it (SoftMCCS)

3） Select your Display Mode, then choose "File->Save EDID as " and save the file as "Raylar EDID file (*.dat)", you can open and edit the dat file, you will see as below:

Step2: Parse the EDID file by tool (Phoenix)

you can download here http://dl.radxa.com/users/yao/Phoenix.zip run the tool, "File -> Open EDID..." to open the dat file saved by SoftMCCS

Select "Detailed Timings"

From the above picture, we can get these parameter needed by driver file.

"kernel/drivers/video/rockchip/hdmi/hdmi-lcdc.c"

/* name refresh xres yres pixclock h_bp h_fp v_bp v_fp h_pw v_pw polariry PorI flag vic 2ndvic pixelrepeat interface */

{ { "1440x900p@60Hz", 60, 1440, 900, 106500000, 232, 80, 25, 3, 152, 6, 0, 0, 0 }, 2, 0, 1, OUT_P888},

Note :

H = Horizontal, V = vertical

Pixel Clk: 106500000 (106.50MHz)

Resolution: xres=1440, yres=900.

h_fp = H sync Offset = 80

h_pw = H sync width = 152;

h_bp = H Blank - h_fp - h_pw = 464 - 80 - 152 = 232;

v_fp = V Sync Offset = 3

v_pw = V sync width = 6

v_bp = V Blank - v_fp -v_pw = 25

Add line like “1440x900p@60Hz....”use the parameter value above. (the other parameter can use like ""1440x900p@60Hz..." )

Then cd kernel, make clean and re-compile

Step 3: Flash the image, and set the resolution

Android:

you can set by Settings->Display->HDMI Mode

Linux:

#cat /sys/class/display/display0.HDMI/modes

1920x1080p-60

...

1440x900p-60

..

echo #echo 1440x900p-60 > /sys/class/display/display0.HDMI/mode

The above are the whole steps. we have serveral customers tested ok. but we can't make sure it is fitted for all.

Q&A

1) After set the new resolution, I found the refresh frequency is not the same as the setting. e.g. I set "1360x768@60Hz",the display shows "1360x768@46", what's the problem.

It caused by the pixclock changed by the system. The system will choose another value it think more suitable base on the pixclock you set on the "drivers/video/rockchip/hdmi/hdmi-lcdc.c", you can get the value for kernel log.

e.g.

I modify "1360x768@60Hz, pixclock = 85500000". in the "drivers/video/rockchip/hdmi/hdmi-lcdc.c", but the result shows on display is "1360x768@46Hz",

At last I found the pixclock clock the system used is "75000000" not "85500000" we set like the below message.

[ 119.205896] lcdc1: dclk:75000000>>fps:46

then how to fix this?

Use the pixclock "75000000" set by the system, adjusts the values of " h_fp,h_bp,h_pw. v_fp,v_bp,v_pw" to fit the formula

（xres + h_fp + h_bp + h_pw） x (yres + v_fp + v_bp + v_pw) * fps = pixclock. (the fps is refresh frequency value. e.g. 1360x768@60Hz, the fps = 60)

then update the value in the "drivers/video/rockchip/hdmi/hdmi-lcdc.c".

2）The resolution and fps are all right. but the screen shows mess

It caused by the values of "h_fp,h_bp,h_pw. v_fp,v_bp,v_pw" are not suitable, you can adjust them base on

（xres + h_fp + h_bp + h_pw） x (yres + v_fp + v_bp + v_pw) * fps = pixclock. and then update on the file

"drivers/video/rockchip/hdmi/hdmi-lcdc.c".

3）I can't found the resolution item after I add the new resolution in "drivers/video/rockchip/hdmi/hdmi-lcdc.c".

Make sure you execute "make clean" under kernel and re-compile.

@@ Line 1: / Line 1: @@
-Note:
+'''Note:'''
 ) the method is suit for rock pro, rock lite & rock2 square
 ) the method is suit for Android & Linux
-Step 1: Get the EDID parameter by tools
+'''Step 1: Get the EDID parameter by tools'''
 Note: There is  just tool under windows, we will provide tool under linux Later
@@ Line 9: / Line 12: @@
 )Install sm_setup.exe, then run it (SoftMCCS)
+[[File:wiki_hdmi_resolution_1.png]]
+） Select your Display Mode, then choose "File->Save EDID as " and save the file as "Raylar EDID file (*.dat)",  you can open and edit the dat file, you will see as below:
+[[File:wiki_hdmi_resolution_2.png]]
+'''Step2: Parse the EDID file  by tool (Phoenix)'''
+you can download here http://dl.radxa.com/users/yao/Phoenix.zip
+run the tool, "File -> Open EDID..." to open the dat file saved by SoftMCCS
+[[File:wiki_hdmi_resolution_3.png]]
+Select "Detailed Timings"
+[[File:wiki_hdmi_resolution_4.png]]
+From the above picture, we can get these parameter needed by driver file.
+"kernel/drivers/video/rockchip/hdmi/hdmi-lcdc.c"
+/*  name  refresh xres   yres    pixclock   h_bp    h_fp    v_bp    v_fp    h_pw    v_pw   polariry      PorI    flag     vic      2ndvic      pixelrepeat     interface */
+{ {     "1440x900p@60Hz",        60,      1440,   900,    106500000,     232,    80,     25,     3,              152,    6,                      0,                              0,      0       },      2,      0,        1,      OUT_P888},
+Note :
+H  = Horizontal, V = vertical
+Pixel Clk: 106500000 (106.50MHz)
+Resolution: xres=1440, yres=900.
+h_fp = H sync Offset = 80
+h_pw = H sync width = 152;
+h_bp = H Blank - h_fp - h_pw = 464 - 80 - 152 = 232;
+v_fp = V Sync Offset = 3
+v_pw = V sync width = 6
+v_bp = V Blank - v_fp -v_pw = 25
+Add line like “1440x900p@60Hz....”use the parameter value above. (the other parameter can use like ""1440x900p@60Hz..." )
+Then  cd kernel, make clean and re-compile
+'''Step 3: Flash the image, and set the resolution'''
+Android:
+you can set by Settings->Display->HDMI Mode
+Linux:
+ #cat /sys/class/display/display0.HDMI/modes
+x1080p-60
+...
+x900p-60
+..
+ echo #echo 1440x900p-60 > /sys/class/display/display0.HDMI/mode
+The above are the whole steps. we have serveral customers tested ok. but we can't make sure it is fitted for all.
+'''Q&A'''
+) After set the new resolution, I found the refresh frequency is not the same as the setting. e.g. I set "1360x768@60Hz",the display shows "1360x768@46", what's the problem.
+It caused by the pixclock changed by the system.  The system will choose another value it think more suitable base on the pixclock you set on the "drivers/video/rockchip/hdmi/hdmi-lcdc.c",  you can get the value for kernel log.
+e.g.
+I modify "1360x768@60Hz, pixclock = 85500000". in the  "drivers/video/rockchip/hdmi/hdmi-lcdc.c", but the result shows on display is "1360x768@46Hz",
+At last I found the pixclock clock the system used is "75000000" not "85500000" we set like the below message.
+[  119.205896] lcdc1: dclk:75000000>>fps:46
+then how to fix this?
+Use the pixclock "75000000" set by the system,  adjusts the values of " h_fp,h_bp,h_pw. v_fp,v_bp,v_pw" to fit the formula
+（xres + h_fp + h_bp + h_pw） x (yres + v_fp + v_bp + v_pw) * fps = pixclock.   (the fps is refresh frequency value. e.g. 1360x768@60Hz, the fps = 60)
+then update the value in the "drivers/video/rockchip/hdmi/hdmi-lcdc.c".
+）The resolution and fps are all right. but the screen shows mess
+It caused by the values of "h_fp,h_bp,h_pw. v_fp,v_bp,v_pw" are not suitable, you can adjust them base on
+（xres + h_fp + h_bp + h_pw） x (yres + v_fp + v_bp + v_pw) * fps = pixclock. and then update on the file
+"drivers/video/rockchip/hdmi/hdmi-lcdc.c".
+）I can't  found the resolution item after I add the new resolution  in "drivers/video/rockchip/hdmi/hdmi-lcdc.c".
+Make sure you execute "make clean" under kernel and re-compile.