Re: MMC_CAP_SDIO_IRQ for omap 3430

Dirk Behme
2009-10-21T17:44:40Z

Madhusudhan wrote:
>
>> -----Original Message-----
>> From: linux-mmc-owner@vger.kernel.org [mailto:linux-mmc-
>> owner@vger.kernel.org] On Behalf Of Dirk Behme
>> Sent: Monday, October 19, 2009 1:17 PM
>> To: linux-omap@vger.kernel.org
>> Cc: Madhusudhan; 'John Rigby'; 'Woodruff, Richard'; linux-
>> mmc@vger.kernel.org; 'Steve Sakoman'
>> Subject: Re: MMC_CAP_SDIO_IRQ for omap 3430
>>
>> Madhusudhan wrote:
>>> Hi John,
>>>
>>> So does the SDIO card interrupt mode work fine now?
>> (wrong attachment in previous mail :( sorry)
>>
>> If somebody likes to test, my updated patch v2 in attachment. Compile
>> tested only, testing and comments are welcome.
>>
>
> Can you inline the v2 patch please? It helps review.

I don't think it is already ready for review. We are still in the
"find out how to get sdio irq working" phase. Once we have found out
what's needed for this, sure, I will send a patch for review inlined.

Best regards

Dirk

> I wonder in the version
> that John tested was the CTPL bit set in "set_ios" or "enable_sdio_irq"?
>
> Regards,
> Madhu
>
>> Cheers
>>
>> Dirk
>>
>>> _____
>>>
>>> From: John Rigby [mailto:jcrigby@gmail.com]
>>> Sent: Sunday, October 18, 2009 7:24 PM
>>> To: Woodruff, Richard
>>> Cc: Dirk Behme; Chikkature Rajashekar, Madhusudhan;
>>> linux-mmc@vger.kernel.org; linux-omap@vger.kernel.org; Steve Sakoman
>>> Subject: Re: MMC_CAP_SDIO_IRQ for omap 3430
>>>
>>>
>>>
>>> Ok I was going to ask where you found that but I just rechecked the TRM
>> and
>>> there it is in plain site:
>>>
>>>
>>>
>>> When this bit is set to 1, the host controller automatically disables
>> all
>>> the input buffers except the buffer of mmci_dat[1] outside of a
>> transaction
>>> in order to detect asynchronous card interrupt on mmci_dat[1] line and
>>> minimize the leakage current of the buffers.
>>>
>>>
>>> In my defence, I did search the TRM for every occurance of dat1 but not
>>> dat[1]. Oh well live and learn and forget and repeat.
>>>
>>> John
>>>
>>> On Sun, Oct 18, 2009 at 6:17 PM, John Rigby <jcrigby@gmail.com> wrote:
>>>> Richard,
>>>>
>>>> MMCHS_CON.CPTL = 1 < Don't disable input buffer on DAT1 after
>>>> completion to allow seeing SDIO interrupt>
>>>>
>>>> Sounds exactly like what we need.
>>>>
>>>> Thanks
>>>> John
>>>>
>>>> On Sun, Oct 18, 2009 at 5:12 PM, Woodruff, Richard <r-woodruff2@ti.com>
>>> wrote:
>>>>>> From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
>>>>>> owner@vger.kernel.org] On Behalf Of Dirk Behme
>>>>>> Sent: Sunday, October 18, 2009 11:45 AM
>>>>>>> It would be funny if the TRM was wrong and the CIRQ bit is really
>>>>>>> cleared by writing 1 to it. I'll try that.
>>>>> A while back I hunted down a few of the bits for this. Maybe this
>> will
>>> help some.
>>>>> SYSCONFIG.ENAWAKEUP = 1 < allow ocp wrapper to generate an interrupt
>> to
>>> prcm>
>>>>> MMCHS_HCTL.IWE = 1 < route wake up to module ocp wrapper>
>>>>> MMCHS_CON.CPTL = 1 < Don't disable input buffer on DAT1 after
>> completion
>>> to allow seeing SDIO interrupt>
>>>>> MMCHS_HCTL.IWE
>>>>> MMCHS_ISE.CIRQ_ENABLE <bit to write to enable interrupt at pin>
>>>>> MMCHS_STAT<bit to write for clear of SDIO interrupt>
>>>>> CCCCR - IRQ_ENABLE (think host stack will do this)
>>>>>
>>>>> Regards,
>>>>> Richard W.
>>>>>
>>>
>
>
>