topic Re: SDHCI trap with register dump dropping SDIO clock in i.MX Processors

SDHCI trap with register dump dropping SDIO clock

vikramramanna — Sat, 09 May 2020 01:40:11 GMT

iMX8MM dropping SDIO clock to 12MHz causes the SDHCI crash

[ 641.123790] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
[ 641.130232] mmc0: sdhci: Sys addr: 0x54968d04 | Version: 0x00000002
[ 641.136671] mmc0: sdhci: Blk size: 0x00000004 | Blk cnt: 0x00000001
[ 641.143110] mmc0: sdhci: Argument: 0x15804004 | Trn mode: 0x00000013
[ 641.149548] mmc0: sdhci: Present:   0x01d88a0a | Host ctl: 0x00000013
[ 641.155986] mmc0: sdhci: Power:     0x00000002 | Blk gap: 0x00000080
[ 641.162425] mmc0: sdhci: Wake-up:   0x00000008 | Clock:    0x0000028f
[ 641.168863] mmc0: sdhci: Timeout:   0x0000008f | Int stat: 0x00000000
[ 641.175301] mmc0: sdhci: Int enab: 0x107f100b | Sig enab: 0x107f100b
[ 641.181739] mmc0: sdhci: AC12 err: 0x00000000 | Slot int: 0x00000502
[ 641.188178] mmc0: sdhci: Caps:      0x07eb0000 | Caps_1:   0x8000b407
[ 641.194616] mmc0: sdhci: Cmd:       0x0000353a | Max curr: 0x00ffffff
[ 641.201054] mmc0: sdhci: Resp[0]:   0x00001000 | Resp[1]: 0x00000000
[ 641.207492] mmc0: sdhci: Resp[2]:   0x00000000 | Resp[3]: 0x00000000
[ 641.213930] mmc0: sdhci: Host ctl2: 0x00000088
[ 641.218372] mmc0: sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x5608d208
[ 641.224809] mmc0: sdhci: ============================================

NXP team, can someone point to what could be the reason

Don't see any issue with iMX8MQ or iMX6/7

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Thu, 14 May 2020 07:03:38 GMT

Are you use the reference board or you design board yourself for i.MX8MM?

Re: SDHCI trap with register dump dropping SDIO clock

vikramramanna — Thu, 14 May 2020 07:08:59 GMT

Reference board i.MX 8M Mini Evaluation Kit | NXP

Also on this hardware iMX8M Mini uCOM Developer's Kit V2 - Embedded Artists

Dont see the issue on iMX8M Quad Developer's Kit V2 - Embedded Artists or other iMX series

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Thu, 14 May 2020 07:35:47 GMT

Do you mean you meet this question in our i.MX8MM EVK board? If yes, I will do confirm it for you.

Re: SDHCI trap with register dump dropping SDIO clock

vikramramanna — Thu, 14 May 2020 07:38:08 GMT

Sorry did not understand your question.

The SDHCI crashes, is there any driver update or fix from the crash dump i've provided above ?

Are there any known issues with iMX8MM in particular ?

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Thu, 14 May 2020 07:47:20 GMT

I have not used the iMX8MM dropping SDIO clock to 12MHz, for your question I will do further confirm it with our expert team , when I get feedback I will send to you as soon as possible.

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Thu, 14 May 2020 07:49:25 GMT

Could you tell me which version BSP are you using？

Re: SDHCI trap with register dump dropping SDIO clock

vikramramanna — Fri, 15 May 2020 06:15:07 GMT

#define SDHCI_HOST_VERSION 0xFE

is from sdhci.c file

also if you see the crash dump

it says Version 02

Is there some place I can look for ?

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Mon, 18 May 2020 02:05:34 GMT

Can you tell us which mode did you configured for the SDHC system? I have sent your question to our expert team. And our expert are confirming it for you.

Re: SDHCI trap with register dump dropping SDIO clock

vikramramanna — Mon, 18 May 2020 02:30:21 GMT

Mode is 4bit SDIO mode

Operation freq is 12Mhz.

Can this be treated as priority. Looks like a bug in the driver implementation of SDHC.

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Tue, 19 May 2020 07:47:50 GMT

Hi Vikram,

Could you tell us which version BSP are you using? L5.4.3_1.0.0 or L4.19.35_1.1.0 or other version. We need know this for further confirming.

Have a nice day

Rita

Re: SDHCI trap with register dump dropping SDIO clock

vikramramanna — Tue, 19 May 2020 19:31:06 GMT

This is the BSP version is 4.14.98-2.2.0

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Wed, 20 May 2020 03:23:27 GMT

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Thu, 21 May 2020 09:08:54 GMT

Hi Vikram,

This is the update from our expert. Hope this can do help for you.

After doing a bit o research I have found in the Release Notes that BSP version 4.14.98-2.2.0 is not GA tested for iMX8MM. My recommendation for the customer is to switch to a GA release such as 4.14.98-2.0.0_ga or newer (4.19.35 or 5.4) and try dropping the SDIO clock to 12MHz on that release.

Have a nice day

Best Regards

Rita

Re: SDHCI trap with register dump dropping SDIO clock

ramesh_r — Fri, 12 Jun 2020 19:39:54 GMT

Hi Rita,

This same test was run on using NXP's L5.4.3 BSP release and the problem is still observed. When the mmc clock is changed to 12Mhz, this message is observed with a dump:

Timeout waiting for hardware interrupt

drivers/mmc/host/sdhci.c:sdhci_timeout_data_timer <== Here is the source & function. Attaching a screenshot for ref.

Can you please help?

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Tue, 16 Jun 2020 05:46:04 GMT

I will confirm it for you.

Re: SDHCI trap with register dump dropping SDIO clock

ramesh_r — Thu, 25 Jun 2020 15:43:07 GMT

Hi Rita,

Just checking to see if you heard anything on this?

Regards

Ramesh

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Tue, 30 Jun 2020 07:56:14 GMT

Hi Ramesh,

From dump log, driver are sending cmd53 to read multiple block and retrieve security protocol related information from device.

Is it mean if using L5.4.3/4.14.98-2.2.0 default BSP, drop the SDIO clock to 12MHz, then we can reproduce this issue on 8MM EVK? Then it will be easy to analyze.

Have a nice day

Rita

Re: SDHCI trap with register dump dropping SDIO clock

Rita_Wang — Wed, 01 Jul 2020 03:31:30 GMT

Hi Ramesh,

Could you provide the full log and the kernel patch of modifying SDIO clock to 12MHz? We can help test on our board.

Have a nice day

Best Regards

Rita

Re: SDHCI trap with register dump dropping SDIO clock

ramesh_r — Wed, 01 Jul 2020 05:12:07 GMT

Hi Rita,

I will share a dmesg log soon. For reproducing this issue - you could use any standard SD MMC card on NXP imx8mnevk board running NXP's L5.4.3 BSP release. After the mmc host driver is up, you need to change the clock on mmc device to 12Mhz and you should see the issue right away. For example, I used the below commands to change the max frequency of the mmc clock.

echo 8 > /proc/sys/kernel/printk

# Dump the current clock frequency
cat /sys/kernel/debug/mmc0/ios
sleep 0.5

# Change to 12Mhz
echo 12000000 > /sys/kernel/debug/mmc0/clock
sleep 1

# Check if it is correctly set
cat /sys/kernel/debug/mmc0/ios

At this point, any moment you should see the above stack dump.

Regards

Ramesh