[PATCH V3 0/5] sdhci-esdhc-imx: use gpio for write protection and card detection

Arnaud Patard (Rtp) arnaud.patard at rtp-net.org
Fri Feb 25 14:31:17 EST 2011

Eric Benard <eric at eukrea.com> writes:

> Hi Arnaud,

Salut !
> On 24/02/2011 12:40, Arnaud Patard (Rtp) wrote:
>> Wolfram Sang<w.sang at pengutronix.de>  writes:
>> Hi,
>>> Take #3, changes:
>>> * also intercept calls to SDHCI_SIGNAL_ENABLE (needed on mx25)
>>> * remove unconditional BROKEN_CARD_DETECTION (leftover)
>>> * improved kernel-doc about unused GPIO
>>> * added tags from Eric
>>> Tested now by me and Marc on mx35, Eric on mx25/35/51. Arnaud, did you have a
>>> chance to retest on mx51? What about the FSL guys? :)
>> I'm getting a hard freeze on my efika sb and mx once I remove the
>> unconditional BROKEN_CARD_DETECTION flag. I'm still investigating the
>> issue. I'll keep you informed if I find something.
> may you please test the attached patch. It may give someone with a
> better knowledge of sdhci than me an idea of what is wrong.

I've tested this patch on my efikamx and this patch does solve the
issue. I didn't test on the efika smartbook but I guess it'll be fine
here too. Thanks.

> Here are the workaround this patch add :
> - we can't let enable or disable irq enabled when the card is
> present/not present, else the irq triger again which explains why you
> get the freeze -> so we must rely on the card presence bit to enable
> the right interrupt,

so, we're getting an interrupt storm, right ? can't it be fixed by
setting a different irq type ?

> - we can't turn the clock off if we want the card detect to work when
> the card is removed -> as a quick workaround this patch prevents
> sdhci_set_clock from turning off the clocks when the
> SDHCI_INT_CARD_INSERT interrupt is enabled.
> Also, I had to change the MX51_PAD_GPIO1_0__SD1_CD pad setting as
> follows to enable the internal pull up :

It worked without changing this.


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