topic Re: [i.MX93] temperature grade is wrong in i.MX Processors

[i.MX93] temperature grade is wrong

yoooh8668 — Fri, 19 Apr 2024 11:08:25 GMT

Hi,

I found the imx93 (rev.beta) does not match the temperature grade as it should be.

Here is the picture and its uboot log:

REV.beta

U-Boot 2023.04-00263-g7c7dd0dc2b0 (Apr 19 2024 - 15:50:35 +0800) CPU: i.MX93(52) rev1.0 1700 MHz (running at 1692 MHz) CPU: Consumer temperature grade (0C to 95C) at 51C

REV.GA

U-Boot 2023.04-00263-g7c7dd0dc2b0 (Apr 19 2024 - 15:50:35 +0800) CPU: i.MX93(52) rev1.1 1700 MHz (running at 1692 MHz) CPU: Consumer temperature grade (0C to 95C) at 35C

and here is the reference picture:

I'm afraid that the detect code in uboot is not correct.

//arch/arm/mach-imx/imx9/soc.c u32 get_cpu_temp_grade(int *minc, int *maxc) { int ret; u32 val; ret = fuse_read(2, 3, &val); if (ret) val = 0; /* If read fuse failed, return as blank fuse */ val >>= 4; val &= 0x3; if (minc && maxc) { if (val == TEMP_AUTOMOTIVE) { *minc = -40; *maxc = 125; } else if (val == TEMP_INDUSTRIAL) { *minc = -40; *maxc = 105; } else if (val == TEMP_EXTCOMMERCIAL) { if (is_imx93()){ /* imx93 only has extended industrial*/ *minc = -40; *maxc = 125; } else { *minc = -20; *maxc = 105; } } else { *minc = 0; *maxc = 95; } } return val; }

THANKS~~

Re: [i.MX93] temperature grade is wrong

JorgeCas — Fri, 19 Apr 2024 16:04:09 GMT

Hello,

That is strange since the part number indicates that correspond to an industrial part number.

Is this happening on other REV.beta devices?

Which are the software versions that you are using?

From what I have understood, the detect code in U-boot works as expected. It would be too strange if fuse values of device are wrong.

Best regards.

Re: [i.MX93] temperature grade is wrong

opedis — Fri, 19 Apr 2024 23:54:11 GMT

In the picture, the Q(Qualification leve) is "P".

Maybe that is problem. It is just a samples. Not a mass production.

Re: [i.MX93] temperature grade is wrong

yoooh8668 — Sat, 20 Apr 2024 02:14:05 GMT

Hi,
There are 4 piece of this sample(rev.beta) , all of them show the same result.

The branch is v2023.04_6.1.55_2.2.0 with our commits on it.
And there is no modifies on `arch/arm/mach-imx/imx9/soc.c` .

Maybe only the mass production can support this function(reg)?
Thanks~~

Re: [i.MX93] temperature grade is wrong

yoooh8668 — Sat, 20 Apr 2024 02:15:38 GMT

I think so, but wait for official reply.

Re: [i.MX93] temperature grade is wrong

JorgeCas — Mon, 22 Apr 2024 17:21:31 GMT

Hello,

The last release that is supported on A0 revision is Linux 6.1.22_2.0.0.

But I confirmed that behavior on our EVK. This could be caused by placeholder on the code, or this feature could not be implemented on the pre-production revision.

Best regards.