Re: [PATCH v9 1/2] regulator: Add driver for max77802 PMIC PMIC regulators

Javier Martinez Canillas
2014-08-22T22:02:11Z

Hello Mark,

On 08/22/2014 08:30 PM, Mark Brown wrote:
>
>> The problem is that one of these regulators is used as the vqmmc-supply
>> (VCCQ/VDD_IO) so the mmc host controller driver disables it on
>> MMC_POWER_OFF. Now AFAIK (Yuvaraj can correct me what I got wrong) this
>> shouldn't be an issue since on card detection, the vqmmc supply should be
>> enabled again but on Exynos the built-in card detect line is on the same
>> power rail as vqmmc. That means that disabling the regulator prevents card
>> insertions to be detected.
>
> If the MMC host controller needs a supply enabling in order to do card
> detection and it's supposed to be doing card detection I'd expect it to
> be enabling that supply. Why is it not doing that?
>

Good question. I'm not that familiar with the dw_mmc host controller nor
its driver implementation so I'll let Yuvaraj or Doug to answer that.

Best regards,
Javier