[U-Boot] mmc: sdhci: Add a quirk to add delay during completion of sdhci_send_cmd

[Jagan Teki]

Hi Tushar,

On Mon, Apr 8, 2013 at 9:22 AM, Tushar Behera <tushar.behera at linaro.org> wrote:
> On 04/07/2013 10:27 AM, Jagan Teki wrote:
>> Hi,
>>
>> I saw that you have been added the SDHCI_QUIRK_WAIT_SEND_CMD on below commit
>> http://git.denx.de/?p=u-boot.git;a=commitdiff;h=13243f2eafc4292917178051fe1bb5aab2774dca
>>
>> I need few quires regarding the QUIRK delay.
>> 1. Why the delay is 1000
>> +       if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD)
>> +               udelay(1000);
>> +
>> 2. is this delay specific to s5p_sdhci  controller?
>

BTW:
Can you please help me out what is the reason for max and min clocks
are at 52000000 and 400000 respectively.

As per my knowledge the max clock of sdhci on spec-2 is 50000000
(50Mhz), I may be in correct.

Request for your help.

Thanks,
Jagan.

> This was specific to s5p_sdhci driver so as to replicate the behavior of
> s5p_mmc driver.
>
>> 3. I have an issue "Controller never released inhibit bit(s)"
>>    but when I enable this quirk on my driver with udelay(10000), it's
>> working.
>
> I am not sure about the exact delay as per the spec. I have added
> Jaehoon to CC who might have additional information about this.
>
>>
>> Could you please help me.
>>
>> Thanks,
>> Jagan.
>>
>
>
> --
> Tushar Behera