Linux/AM3352: MMC issue

Nomo

Part Number: AM3352

Tool/software: Linux

Hello,

On my customer's custom board, the internal delay (about 700ms) of Linux Kernel happens when microSD card is inserted and removed continuously.
The frequency of occurrence is 1/200.

If you have heard above behavior, could you share the information about this problem?

This problem seems to be occured in wait_for_completion() of kernel/sched/completion.c which is called from mmc driver.

Best Regards,
Nomo

over 7 years ago

0 Biser Gatchev-XID over 7 years ago

TI__Guru**** 393215 points

What Linux version is this?

0 Nomo over 7 years ago in reply to Biser Gatchev-XID

Guru 16800 points

Hello Biser-san,

The SDK version is 04.00.00.04 and the kernel version is 4.9.28-geed43d1050.
They've applied the following patched related to CPU's vulnerability.
git.kernel.org/.../

Best Regards,
Nomo

0 Steve Kipisz over 7 years ago in reply to Nomo

TI__Genius 15510 points

The code you referenced earlier is in the mmc core stack. It's possible that the stack is taking that long.

Steve K.

0 Nomo over 7 years ago in reply to Steve Kipisz

Guru 16800 points

Hello Steve-san,

Thank you for your reply.
Have you heard the long delay issue in the mmc core stack?
Could you give us any advice to solve this issue?

Best Regards,
Nomo

0 Steve Kipisz over 7 years ago in reply to Nomo

TI__Genius 15510 points

I have not heard of any long delay issue. Can you enable debug ?

Steve K.

0 Steve Kipisz over 7 years ago in reply to Steve Kipisz

TI__Genius 15510 points

I tried reproducing the problem but could not.

Steve K.

0 Nomo over 7 years ago in reply to Steve Kipisz

Guru 16800 points

Hello Steve-san,

I appreciate for your kind support.
I'll ask my customers to debug the issue, and once I close this thread.
If the additional questions are made, I'll make a new thread.

Best Regards,
Nomo

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Linux/AM3352: MMC issue