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From: Ulf Hansson <ulf.hansson@linaro.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Ludovic Desroches <ludovic.desroches@atmel.com>,
	Nicolas Ferre <nicolas.ferre@atmel.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	linux-mmc <linux-mmc@vger.kernel.org>
Subject: Re: [PATCH] sdhci: wakeup from runtime PM
Date: Fri, 8 Apr 2016 22:51:51 +0200	[thread overview]
Message-ID: <CAPDyKFqMOmNhXfJGVyvBvc5dD=wTR3Wvz64CuL8iq4dQJSHk3g@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1604081114480.2069-100000@iolanthe.rowland.org>

On 8 April 2016 at 17:19, Alan Stern <stern@rowland.harvard.edu> wrote:
> On Fri, 8 Apr 2016, Ulf Hansson wrote:
>
>> From power consumption point if view we already discussed this
>> particular case in an earlier thread, but let me elaborate what I
>> think one more time:
>>
>> Now, this is relevant for removable cards lacking GPIO card detect, as
>> for other cases and non-removable cards I think we are in agreement
>> that their is no issue from power consumption point of view, right!?
>>
>> 1. The current solution:
>> - Use MMC_CAP_NEEDS_POLL which makes the mmc core to re-schedule a
>> work once every second to poll for a card (Why is it one second? Could
>> we perhaps have that configurable?).
>
> The block layer handles media polling for removable block devices, and
> it is configurable.  For example, /sys/block/sr0/events_poll_msecs can
> be set to control how often the system polls for a disc in my DVD
> drive.
>
> Does MMC do its own polling separate from the block layer?  If so, why?

Good question. Probably because of legacy or perhaps to deal with corner cases.

When I get some spare bandwidth I will check to see if it makes sense
to convert MMC polling to the block layer polling.

Kind regards
Uffe

  reply	other threads:[~2016-04-08 20:51 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-25 16:05 [PATCH] sdhci: wakeup from runtime PM Ludovic Desroches
2016-03-25 16:05 ` Ludovic Desroches
2016-03-25 16:05 ` [PATCH] DRAFT: shdci: allows custom wakeup irqs for " Ludovic Desroches
2016-03-25 16:05   ` Ludovic Desroches
2016-03-25 16:46   ` kbuild test robot
2016-03-25 16:46     ` kbuild test robot
2016-03-25 16:50   ` kbuild test robot
2016-03-25 16:50     ` kbuild test robot
2016-03-25 17:12   ` kbuild test robot
2016-03-25 17:12     ` kbuild test robot
2016-03-25 17:27   ` kbuild test robot
2016-03-25 17:27     ` kbuild test robot
2016-03-25 16:05 ` [PATCH] mmc: sdhci-of-at91: allow the use of controller card detect as wake up Ludovic Desroches
2016-03-25 16:05   ` Ludovic Desroches
2016-03-25 17:11   ` [PATCH] mmc: sdhci-of-at91: fix semicolon.cocci warnings kbuild test robot
2016-03-25 17:11     ` kbuild test robot
2016-03-25 17:11   ` [PATCH] mmc: sdhci-of-at91: allow the use of controller card detect as wake up kbuild test robot
2016-03-25 17:11     ` kbuild test robot
2016-04-05 12:40 ` [PATCH] sdhci: wakeup from runtime PM Adrian Hunter
2016-04-07  9:11   ` Ulf Hansson
2016-04-07 15:12     ` Ludovic Desroches
2016-04-08  8:35       ` Ulf Hansson
2016-04-08 15:19         ` Alan Stern
2016-04-08 20:51           ` Ulf Hansson [this message]
2016-04-11 12:09         ` Ludovic Desroches

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