From: Jaehoon Chung <jh80.chung@samsung.com>
To: linux-mmc@vger.kernel.org, ulf.hansson@linaro.org
Subject: Re: questions about runtime pm
Date: Mon, 18 Jan 2016 11:35:41 +0900 [thread overview]
Message-ID: <569C4F7D.40700@samsung.com> (raw)
In-Reply-To: <20160115150143.GA10117@odux.rfo.atmel.com>
Hi,
On 01/16/2016 12:01 AM, Ludovic Desroches wrote:
> On Tue, Dec 22, 2015 at 02:24:53PM +0100, Ludovic Desroches wrote:
>> Hi guys,
>>
>> I have recently added PM support for my driver but I don't have the
>> behavior I was expecting. I am wondering if I didn't do something wrong.
>>
>> I have implemented runtime_suspend in a very simple way, I call
>> sdhci_runtime_suspend_host() and I disable the clocks. It works pretty
>> well with the eMMC which is non removable but with a SD card... If I
>> have my SD card present on boot time, it is detected but
>> insertion/removal is not detected.
>>
>> Having a look to sdhci_runtime_suspend_host() internal, all the
>> interruptions are disabled expecting the card interrupt if it has been
>> set earlier.
>>
>> From my understanding, it means that if there is no activity on sdhci,
>> we will go to suspend and then we could wake up only on a software event
>> (or a sdio interrupt). How to manage card insertion/removal in this
>> case? My problem is so huge, I have probably missed something...
Is there any detection method for SD-card(removable card)?
Doesn't use Card-detect pin or Polling..?
Best Regards,
Jaehoon Chung
>>
>> Moreover, to avoid system PM, I have used pm_runtime_force_suspend but I
>> could not wake up on card insertion/removal too. Do I have to use system
>> PM if I want to manage this case?
>>
>> Thanks for your advices.
>>
>> Regards
>>
>> Ludovic
>
>
> Any feedback?
>
>
> Ludovic
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next prev parent reply other threads:[~2016-01-18 2:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-22 13:24 questions about runtime pm Ludovic Desroches
2016-01-15 15:01 ` Ludovic Desroches
2016-01-18 2:35 ` Jaehoon Chung [this message]
[not found] <EMEW3|116e69362a474a99eb7966986654fb49p9RFXO07lm15g10|ecs.soton.ac.uk|526E83A9.8000703@ecs.soton.ac.uk>
2013-10-28 19:16 ` Questions about Runtime PM Alan Stern
2013-10-28 20:19 ` David C Niemi
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