questions about imx6d temperature trip point

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questions about imx6d temperature trip point

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azmatliu
Contributor III

processor:imx6D

We modfied the linux-imx/drivers/thermal/imx_thermal.c and chang change the passive and critical trip ponits because the video output will get wrong when the tempture reaching passive point.Is it safe enough to increase passive temperature to105 degree?

-#define IMX_TEMP_PASSIVE        85000
-#define IMX_TEMP_PASSIVE_COOL_DELTA    10000
+#define IMX_TEMP_PASSIVE        105000
+#define IMX_TEMP_CRITICAL        110000
+#define IMX_TEMP_PASSIVE_COOL_DELTA    2000

Besides,accroding to the "i.MX_Linux_Reference_Manual.pdf", cooling device will lower CPU frequency and notify GPU to run at a lower frequency when reaching passive point.So how can I prevent GPU to run at a lower frequency except changing the trip points?

Best regards

Azmat

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igorpadykov
NXP Employee
NXP Employee

Hi Azmat

>it safe enough to increase passive temperature to105 degree?

basically max. Junction temperature extended commercial = 105C

according to Table 6. Operating Ranges i.MX6DQ Datasheet

so it is not recommended to exceed it.

http://www.nxp.com/docs/en/data-sheet/IMX6DQCEC.pdf

For controlling temperature one can follow recommendations given in

AN4579 i.MX 6 Series Thermal Management Guidelines
https://www.nxp.com/docs/en/application-note/AN4579.pdf

>I prevent GPU to run at a lower frequency except changing the trip points?

one can try to disable bus frequency driver described in Chapter 24
Dynamic Bus Frequency Driver attached Linux Manual.

Best regards
igor
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938 Views
azmatliu
Contributor III

Hi igor,

  

    The information and guidelines are great!

Thank you!

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