Parameters for 83,5 MHz pixel clock on imx8mp @joanxie

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Parameters for 83,5 MHz pixel clock on imx8mp @joanxie

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adam-itab
Contributor I

As requested in the following thread, I have created an account with my company email. Would it be possible to receive the parameters to set the pixel clock to 83500000 as discussed in the thread?

https://community.nxp.com/t5/i-MX-Processors/imx8mp-programming-hdmi-phy-pll-timings/m-p/1609491/hig...

Thanks.

 

@joanxie 

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joanxie
NXP TechSupport
NXP TechSupport

try add the blow parameters in the samsung_phy_pll_cfg table

    Pixel Clock
(MHz)
APB Read /
Write
83.5
8
04 R/W D1
08 R/W 60
0C R/W 58
10 R/W 8D
14 R/W 06
18 R/W 00
1C R/W 40
20 R/W 4F
24 R/W 30
28 R/W 33
2C R/W 65
30 R/W 10
34 R/W A0
38 R/W 24
3C R/W 80
40 R/W 6C
44 R/W F2
48 R/W 67
4C R/W 00
50 R/W 10
54 R/W 85
58 R/W 30
5C R/W 3A
60 R/W 74
64 R/W 8F
68 R/W 00
6C R/W 00
70 R/W 08
74 R/W 00
78 R/W 00
7C R/W 00
80 R/W 00
84 R/W 80
8C R/W 00
90 R/W 00
94 R/W 00
98 R/W 00
9C R/W 00
A0 R/W 00
A4 R/W E0
A8 R/W 83
AC R/W 0F
B0 R/W 3E
B4 R/W F8
BC R/W 00  

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Phil_liu
Contributor I

@joanxie 

 For my HDMI screen, I used the parameter by modetest. 

edid information :  resolution is 1920x720 , clock is 115.2MHZ  , could you provide me with the pll parameters please?

 

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joanxie
NXP TechSupport
NXP TechSupport
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baestaenstim
Contributor I

Hello @joanxie , for my HDMI screen, I need a 51.2Mhz clock, could you provide me with the pll parameters please?

Thank you!

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joanxie
NXP TechSupport
NXP TechSupport

try add the blow parameters in the samsung_phy_pll_cfg table

    Pixel Clock
(MHz)
APB Read /
Write
83.5
8
04 R/W D1
08 R/W 60
0C R/W 58
10 R/W 8D
14 R/W 06
18 R/W 00
1C R/W 40
20 R/W 4F
24 R/W 30
28 R/W 33
2C R/W 65
30 R/W 10
34 R/W A0
38 R/W 24
3C R/W 80
40 R/W 6C
44 R/W F2
48 R/W 67
4C R/W 00
50 R/W 10
54 R/W 85
58 R/W 30
5C R/W 3A
60 R/W 74
64 R/W 8F
68 R/W 00
6C R/W 00
70 R/W 08
74 R/W 00
78 R/W 00
7C R/W 00
80 R/W 00
84 R/W 80
8C R/W 00
90 R/W 00
94 R/W 00
98 R/W 00
9C R/W 00
A0 R/W 00
A4 R/W E0
A8 R/W 83
AC R/W 0F
B0 R/W 3E
B4 R/W F8
BC R/W 00  
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adam-itab
Contributor I

Sorry for the late reply, my workload got re-prioritized.

Adding the frequency of 83,5 MHz with these parameters seem to have solved the issue for me. Resolution looks proper on my 1280x800 display.

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