linux-kernel - RE: [PATCH v4 0/4]implement eMMC4.4 standard HW reset feature

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Date:	Tue, 7 Dec 2010 00:03:02 +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>,
	"Mai, Leonard" <leonard.mai@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: RE: [PATCH v4 0/4]implement eMMC4.4 standard HW reset feature

Hello all,
How about these patches? It implemented HW reset feature. When card occurred a timeout error during reading/writing/erasing, these patches will allow driver to reset eMMC card by trigger a HW reset signal.
Does anyone have any comments about the implementation of these patches? Wolfram and Arnd already pointed out the unsuitable patch headers. Thanks! :)


> -----Original Message-----
> From: linux-mmc-owner@...r.kernel.org
> [mailto:linux-mmc-owner@...r.kernel.org] On Behalf Of Chuanxiao Dong
> Sent: Wednesday, December 01, 2010 8:49 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
> Subject: [PATCH v4 0/4]implement eMMC4.4 standard HW reset feature
> 
> Hi,
> 	These are the version 4 patches to implement eMMC4.4 HW reset
> 	feature. Host controller can use this feature by trigger RST_n signal.
> 	To enable this, byte 162 of EXT_CSD register should be set.
> 	HW reset is implemented in mmc core layer and sdhci host layer, and it
> 	will be used after each reading/writing/erasing timeout error occures.
> 
> 	change-log:
> 	This version change the way to detect timeout error conditions. Added a
> 	new routine mmc_handle_timeout_error to do this instead to do this in
> 	mmc_wait_for_req. Each timeout read/write/erase command can use this
> 	routine to do HW reset.
> 
> 	patch1: enable HW reset capability if card support.
> 
> 	patch2: add two new callback to implement HW reset in mmc core layer. In
> 	this patch, routine mmc_handle_timeout_error was added.
> 
> 	patch3: implement hardware_reset callback for sdhci host. A new callback
> 	reset_emmc was defined which will be each sdhci host controller to
> 	implement separately.
> 
> 	patch4: did a HW reset after each read/write/erase command.
> 
> Thanks
> Chuanxiao
> --
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