RE: [PATVH v3 0/3]mmc: set a suitable max_discard_sectors value for HC

Dong, Chuanxiao
2010-12-07T12:06:40Z

Hi all,
Can these patches be accepted? My SDHCI host controller really needs these patches to use Trim/Erase feature.
If anyone has concern about these patches, do please let me know and I would like to fix them. Thanks.

> -----Original Message-----
> From: linux-mmc-owner@vger.kernel.org
> [mailto:linux-mmc-owner@vger.kernel.org] On Behalf Of Chuanxiao Dong
> Sent: Thursday, December 02, 2010 7:25 PM
> To: linux-mmc@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org; cjb@laptop.org; arjan@linux.intel.com;
> alan@linux.intel.com; akpm@linux-foundation.org; adrian.hunter@nokia.com
> Subject: [PATVH v3 0/3]mmc: set a suitable max_discard_sectors value for HC
>
> Hi,
> This is the version 3 patch which set a suitable max_discard_sectors
> value for SDHCI host controller. In this patch, a new quirk is added for
> such controller.
>
> max_discard_sectors is a parameter of MMC driver request queue. This
> value can limit how many sectors will be passed down to host for
> erasing. The original value for this parameter is UINT_MAX which means
> there is no limitation for the count of sectors to pass down for
> erasing.
>
> But some SDHCI host controller cannot erase too many sectors at one
> time. It may generate a timeout interrupt since the time erasing used is
> longer than the timeout time host can wait.
>
> So these patches add a new quirk for such SDHCI host controller and let
> it erase only signle eraseblock each time. This will be safe for such
> SDHCI host to use.
>
> patch1: add a new quirk for SDHCI host controller. Also add a new
> routine mmc_set_discard_limit which is used to set max_discard_sectors
> value for such SDHCI host controller.
> patch2: set timeout control register for such SDHCI host controller.
> patch3: add this quirk for MFLD SDHCI host controller.
>
> Change-log:
> patch1: let mmc_set_discard_limit can return value UINT_MAX.
> patch2: no change.
> patch3: no change.
>
> Thanks
> Chuanxiao
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