i.MX Processors中的主题 Re: iMX6S ADMA interrupt - timeout

iMX6S ADMA interrupt - timeout

philippeleduc — Tue, 25 Nov 2014 10:38:52 GMT

Hello,

I managed to configure the ADMA2 of the iMX6S uSDHC module. I can read and write the SD card with it. However, the DMA interrupt is never set (DINT in uSDHC_INT_STATUS) while the Transfer COmplete bit is set.

Here is a dump of the registers after a successfull read operation:

=======================uSDHC0 dump===================

DS_ADDR: 0x1459be00

BLK_ATT: 0x00000200

CMD_ARG: 0x07400000

CMD_XFR_TYP: 0x123a0000

CMD_RSP0: 0x00000900

CMD_RSP1: 0xb9edb7ff

CMD_RSP2: 0x325b5983

CMD_RSP3: 0x00000b00

DATA_BUFF_ACC_PORT: 0x00000000

PRES_STATE: 0xff8d8088

PROT_CTRL: 0x00800222

SYS_CTRL: 0x008e013f

INT_STATUS: 0x00000003

INT_STATUS_EN: 0x157f513f

INT_SIGNAL_EN: 0x1070000a

AUTOCMD12_ERR_STATUS: 0x00000000

HOST_CTRL_CAP: 0x07f30000

WTMK_LVL: 0x08000880

MIX_CTRL: 0x00000037

FORCE_EVENT: 0x00000000

ADMA_ERR_STATUS: 0x00000000

ADMA_SYS_ADDR: 0x153dd008

DLL_CTRL: 0x00000000

DLL_STATUS: 0x00000200

CLK_TUNE_CTRL_STATUS: 0x00000000

VEND_SPEC: 0x20007809

MMC_BOOT: 0x00000000

VEND_SPEC2: 0x00000006

As you can see, the TC bit and the CC bit are set, but the DINT is not. However every IT bits are set in the STATUS_EN register.

Does someone know where I am going wrong?

Thank you i advance,

Regards,

Re: iMX6S ADMA interrupt - timeout

Yuri — Mon, 08 Dec 2014 11:40:12 GMT

Please try to apply the workaround for the next item from the Errata :

ERR004364 uSDHC: Limitations on uSDHC3 and uSDHC4 clock-gating

Workarounds:

uSDHC3 and uSDHC4 clock-gating controls should not be configured to gate the clocks in case

RAWNAND and APBADMA are used. There are two registers in CCM that need to be configured

accordingly:

• CCGR: Gating of the clock according to power mode

• CMEOR: Enable/Disable dynamic clock gating

http://cache.freescale.com/files/32bit/doc/errata/IMX6DQCE.pdf

Have a great day,
Yuri

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Re: iMX6S ADMA interrupt - timeout

philippeleduc — Fri, 02 Jan 2015 07:08:55 GMT

I finally identified the problem of the ADMA setup: there was a bug in the cache management function --> the BD structure was not flushes correctly. I have also check the ERR004364 but it seems that there is not concerns with it (thank you anyway Yuri :smileyhappy:).

Re: iMX6S ADMA interrupt - timeout

fabio_estevam — Fri, 02 Jan 2015 13:28:09 GMT

Which OS are you using? Care to share the fix?

Re: iMX6S ADMA interrupt - timeout

philippeleduc — Fri, 02 Jan 2015 13:38:42 GMT

Well, it is a proprietary RTOS so I am not allowed to share this fix (which shouldn't be meaningful for another OS).

Re: iMX6S ADMA interrupt - timeout

fabio_estevam — Fri, 02 Jan 2015 13:51:30 GMT

Ok, got it.