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iMX8M

Question asked by Nick Kadan on Oct 17, 2019
Latest reply on Oct 18, 2019 by CarlosCasillas

hello experts

 

I am using iMX8M mini(nitrogen8m mini) by boundary devices for my projects

this has LCD display and camera connected

I noticed that as soon as i touch few of the icons on the LCD screen the touch response is slow and the log messages show me

 

[  593.680084] alloc_contig_range: 23 callbacks suppressed
[  593.680089] alloc_contig_range: [98600, 98ee8) PFNs busy
[  593.691252] alloc_contig_range: [98700, 98fe8) PFNs busy
[  593.697671] alloc_contig_range: [98800, 990e8) PFNs busy
[  593.703557] alloc_contig_range: [98900, 991e8) PFNs busy
[  593.709410] alloc_contig_range: [98a00, 992e8) PFNs busy
[  593.715438] alloc_contig_range: [98b00, 993e8) PFNs busy

 

---------after sometime
[  813.320524] alloc_contig_range: 20 callbacks suppressed
[  813.320529] alloc_contig_range: [9d100, 9d9cb) PFNs busy
[  813.331983] alloc_contig_range: [9d200, 9dacb) PFNs busy
[  813.338066] alloc_contig_range: [9d200, 9dbcb) PFNs busy
[  813.344150] alloc_contig_range: [9ec00, 9f4cb) PFNs busy
[  813.350252] alloc_contig_range: [9ed00, 9f5cb) PFNs busy
[  813.363012] alloc_contig_range: [9ee00, 9f6cb) PFNs busy
[  813.369245] alloc_contig_range: [9ef00, 9f7cb) PFNs busy
[  813.375417] alloc_contig_range: [9f000, 9f8cb) PFNs busy
[  813.381611] alloc_contig_range: [9f100, 9f9cb) PFNs busy
[  813.387774] alloc_contig_range: [9f200, 9facb) PFNs busy

 

test scenario:

1) now the default value is cma=736M the LCD display is fine but the touch response is slow. and logcat messages show every time i touch a bunch of these messages alloc_contig_range: [9f200, 9facb) PFNs busy

what i have tried so far:

2) i changed the cma=1024M the LCD does not display anything and the kernel messages show some sort of crash.

 

is there are solution for this guys please let me know

 

 

Regards

Nick

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