linux-kernel - Re: [PATCH] sdhci: Add quirk to support polling for card presence

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Message-ID: <464CDEAD.6090106@drzeus.cx>
Date:	Fri, 18 May 2007 01:01:01 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Tobias Bengtsson <tobbe@...be.nu>
CC:	Philip Langdale <philipl@...rt.org>, sdhci-devel@...t.drzeus.cx,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sdhci: Add quirk to support polling for card presence

Tobias, did you test this patch and did it solve your problem?

Philip Langdale wrote:
> There is apparently at least one instance of the Ricoh SDHCI
> implementation out there where card insertion (and possibly
> removal) interrupts do not work - so the only way to detect
> a change in the presence of a card is to poll.
>
> This changes adds a polling quirk for the particular model
> reported by Tobias. The change is tentative as it assumes
> that removal interrupts do not work, but if they do work,
> then we can optimise things by not polling when there is
> a card present. So, it should not be committed until Tobias
> has confirmed the removal behaviour one way or the other and
> the change is accordingly updated.
>
> The polling frequency is 3 seconds because I've been running
> powertop and am paranoid about wakeups now. :-) I did some
> testing locally by masking out the interrupt events and 3
> seconds seems usable enough to me.
>
> Signed-off-by: Philip Langdale <philipl@...rt.org>
>
>   

Rgds

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org

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