linux-kernel - RE: [PATCH] mmc: dw_mmc: setpower on MMC_POWER

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Date:	Wed, 13 Mar 2013 23:20:19 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'James Hogan' <james.hogan@...tec.com>, linux-mmc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	'Jaehoon Chung' <jh80.chung@...sung.com>,
	'Chris Ball' <cjb@...top.org>
Subject: RE: [PATCH] mmc: dw_mmc: setpower on MMC_POWER_{UP,OFF}

Hi James,

On Tuesday, March 12, 2013, James Hogan wrote:
> Call the setpower platform callback in response to set_ios with
> ios->power_mode == MMC_POWER_UP or MMC_POWER_OFF, instead of from the
> card detect work function.
> 
> This appears to fix a problem I have where a card stuck in a funny state
> doesn't get properly cleared by the power being turned off, presumably
> due to lack of power sequencing. This resulted in the following log
> messages after boot:
> 
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 300000Hz, actual 298922HZ div = 167)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 200000Hz, actual 199680HZ div = 250)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 195765Hz, actual 195764HZ div = 255)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 400000Hz, actual 399360HZ div = 125)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 300000Hz, actual 298922HZ div = 167)
> 
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> Cc: Seungwon Jeon <tgih.jun@...sung.com>

This patch is reasonable.
I just want to know though.
I guess this problem is happened when card is inserted as soon as card is removed.
If not, could you explain your situation more?

Thanks,
Seungwon Jeon

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