linux-kernel - Re: [PATCH v3] mmc: dw_mmc: Disable low power mode if SDIO interrupts are used

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Message-ID: <CAFbHwiQuE75YPBPtOihtX4jOKP31n_mO6pu6VOTQkp9_jhjtRA@mail.gmail.com>
Date:	Wed, 25 Jul 2012 10:11:02 +0100
From:	Will Newton <will.newton@...il.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	linux-mmc@...r.kernel.org, Chris Ball <cjb@...top.org>,
	James Hogan <james.hogan@...tec.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	linux-kernel@...r.kernel.org,
	Grant Grundler <grundler@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	shashidharh@...avyalabs.com, ki0351.kim@...sung.com
Subject: Re: [PATCH v3] mmc: dw_mmc: Disable low power mode if SDIO interrupts
 are used

On Tue, Jul 24, 2012 at 5:59 PM, Doug Anderson <dianders@...omium.org> wrote:
> The documentation for the dw_mmc part says that the low power
> mode should normally only be set for MMC and SD memory and should
> be turned off for SDIO cards that need interrupts detected.
>
> The best place I could find to do this is when the SDIO interrupt
> was first enabled.  I rely on the fact that dw_mci_setup_bus()
> will be called when it's time to reenable.
>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> ---
> Changes in v3:
> - Commenting fixes requested by Seungwoon Jeon and Jaehoon Chung.
> - Only pass 'slot' to the low power disable function since whole mmc
>   structure wasn't needed.
>
> Changes in v2:
> - Commenting fixes requested by Grant Grundler.
> - Be extra certain that we don't re-turn on the low power mode in
>   CLKENA in dw_mci_setup_bus() if SDIO interrupts are enabled.
>   There are no known instances of this happening but it's good to be safe.
>
>
>  drivers/mmc/host/dw_mmc.c |   41 ++++++++++++++++++++++++++++++++++++++---
>  1 files changed, 38 insertions(+), 3 deletions(-)

Acked-by: Will Newton <will.newton@...tec.com>
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