2006-05-06 10:37:15

by Sriram V

Subject: sd-io CTO error - advice

Hi,

I am using OMAP.

I am trying to extend sd card driver in linux to support sdio.

When i send CMD 5 - i get CTO error . i dont know whats the problem?.

if i do enable MMC_DEBUG prints i do get the response sometimes.

I dont know why the response is not consitent. add some printks it
works sometimes. remove them it does not work.

I tried sending CMD 5 in a loop - most of the time i do get CTO Errors?.


Any ideas on how to solve this problem?


is it related to the clock - i think it is set to what ever 400KHZ
(this works for MMC/SD Cards)
Is it different for SDIO ?.

The specs says 0-400KHZ during init phase.


Any ideas, where i should look at.

I have set CTO Value to the maximus - 0xff.




MMC1: set_ios: clock 0Hz busmode 1 powermode 0 Vdd 0.00
MMC1: set_ios: clock 400000Hz busmode 1 powermode 1 Vdd 0.21
MMC1: set_ios: clock 400000Hz busmode 1 powermode 2 Vdd 0.21
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0001 (CMD 5): EOC
MMC1: Response 90ff8000
MMC1: End request, err 0
MMC: req done (05): 0: 90ff8000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0001 (CMD 5): EOC
MMC1: Response 90000000
MMC1: End request, err 0
MMC: req done (05): 0: 90000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC: starting cmd 05 arg 00000000 flags 00000009
MMC1: CMD5, argument 0x00000000, 32-bit response, CRC
MMC IRQ 0080 (CMD 5): CTO
MMC1: Command timeout, CMD5
MMC1: Response 00000000
MMC1: End request, err 1
MMC: req done (05): 1: 00000000 00000000 00000000 00000000
MMC1: set_ios: clock 0Hz busmode 1 powermode 0 Vdd 0.00

2006-05-08 11:22:14

by Marcel Holtmann

Subject: Re: sd-io CTO error - advice

Hi,

> I am using OMAP.
>
> I am trying to extend sd card driver in linux to support sdio.
>
> When i send CMD 5 - i get CTO error . i dont know whats the problem?.
>
> if i do enable MMC_DEBUG prints i do get the response sometimes.
>
> I dont know why the response is not consitent. add some printks it
> works sometimes. remove them it does not work.
>
> I tried sending CMD 5 in a loop - most of the time i do get CTO Errors?.

if you post your changes to the source, I am happy to test them with
SDHCI controller hardware and see how it works there.

Regards

Marcel