> -----Original Message-----
> From:
linux-mmc-owner@vger.kernel.org
> [mailto:linux-mmc-owner@vger.kernel.org] On Behalf Of Chuanxiao Dong
> Sent: Thursday, November 18, 2010 5:00 PM
> To:
cjb@laptop.org
> Cc: linux-mmc@vger.kernel.org; linux-kernel@vger.kernel.org;
> alan@linux.intel.com;
arjan@linux.intel.com
> Subject: [PATCH v2 0/3]mmc: set a suitable max_discard_sectors value for HC
>
> Hello Chris,
> These are the version 2 patches of setting a suitable
> max_discard_sectors value for sdhci host controller.
>
> The max_discard_sectors determines how many sectors will be passed
> down to host controller for erasing. The default value is UNIT_MAX
> which means the block layer can pass down unlimited sectors one time
> to host controller. But for some kinds of SDHCI host controller, like
> MFLD SDHCI host controller cannot erase so many sectors one time. It
> will generate a timeout interrupt since the erasing time is longer
> than the host controller waiting timeout time. This should be a
> hardware architecture issue.
>
> So in these patches, add a new quirk to work around this. The new
> quirk can help host controllers to set a safe max_discard_sectors value
> for them.
>
> patch1: Add a new quirk for SDHCI host controller and a new mmc
> capability which will help mmc core layer to set a suitable
> max_discard_sectors value for it.
>
> patch2: Set the sdhci host controller timeout value to be the maximum
> one for each erase command. This will be safe for this kind of SDHCI
> host controller.
>
> patch3: Add the new quirk to MFLD SDHCI host controller.
>
> Thanks
> Chuanxiao
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