linux-kernel - Re: [PATCH 2/2] mmc: rtsx: add support for sdio card

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Message-ID: <5477D682.30107@realsil.com.cn>
Date:	Fri, 28 Nov 2014 01:57:22 +0000
From:	敬锐 <micky_ching@...lsil.com.cn>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"chris@...ntf.net" <chris@...ntf.net>,
	"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	王炜 <wei_wang@...lsil.com.cn>,
	"rogerable@...ltek.com" <rogerable@...ltek.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: [PATCH 2/2] mmc: rtsx: add support for sdio card


On 11/27/2014 11:43 PM, Dan Carpenter wrote:
>> +	int stat_idx = sd_status_index(rsp_type);
> I have always hated this terrible pointer math.  5 is relative to
> pcr->host_cmds_ptr + 1.  It's a mess...
5 mean CRC7 offset of Response R1, see SD spec V3.01 Page 82.
4.9.1 R1 (normal response command).

And we have to +1 to skip unused/undefined data.