linux-kernel - RE: [PATVH v3 0/3]mmc: set a suitable max_discard

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Message-ID: <5D8008F58939784290FAB48F54975198320B3E4E71@shsmsx502.ccr.corp.intel.com>
Date:	Tue, 7 Dec 2010 20:06:15 +0800
From:	"Dong, Chuanxiao" <chuanxiao.dong@...el.com>
To:	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cjb@...top.org" <cjb@...top.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"adrian.hunter@...ia.com" <adrian.hunter@...ia.com>,
	"Mai, Leonard" <leonard.mai@...el.com>,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: RE: [PATVH v3 0/3]mmc: set a suitable max_discard_sectors value for
 HC

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@...r.kernel.org
> [mailto:linux-mmc-owner@...r.kernel.org] On Behalf Of Chuanxiao Dong
> Sent: Thursday, December 02, 2010 7:25 PM
> To: linux-mmc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; cjb@...top.org; arjan@...ux.intel.com;
> alan@...ux.intel.com; akpm@...ux-foundation.org; adrian.hunter@...ia.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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