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

[adam-itab]

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 

[Phil_liu]

@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?

[joanxie]

do you mind creating a new case for me?

https://community.nxp.com/t5/HomeTest-Knowledge-Base/How-to-submit-a-new-question-for-NXP-Support/ta...

[baestaenstim]

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

Thank you!

[joanxie · Accepted solution]

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

[adam-itab]

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.