linux-kernel - Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23

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Date:	Mon, 17 Aug 2015 14:48:03 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	LIYONG <sdliyong@...il.com>, "chris@...ntf.net" <chris@...ntf.net>,
	"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	shawn.lin@...k-chips.com
Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does
 not support CMD23

On 2015/8/15 20:14, LIYONG wrote:
> Thanks Shawn. Please help to check the below in the mmc_blk_rw_rq_prep:
> 	if (do_rel_wr)
> 		mmc_apply_rel_rw(brq, card, req);
>
> I think we need to set the do_rel_wr to false( at the beginning of this function) if the card does not support the CMD23. The above code is executed before the "if ((md->flags & MMC_BLK_CMD23)" code.
>

ok, it makes sense.:)

> Thanks,
> Yong Li
> ----------------------------------------
>> Subject: Re: [PATCH] mmc: block: disable the reliable write If the card does not support CMD23
>> To: sdliyong@...il.com; chris@...ntf.net; ulf.hansson@...aro.org; linux-mmc@...r.kernel.org; linux-kernel@...r.kernel.org
>> CC: shawn.lin@...k-chips.com
>> From: shawn.lin@...k-chips.com
>> Date: Fri, 14 Aug 2015 16:13:02 +0800
>>
>> 在 2015/8/14 15:30, sdliyong@...il.com 写道:
>>> From: Yong Li <sdliyong@...il.com>
>>>
>>> Signed-off-by: Yong Li <sdliyong@...il.com>
>>> ---
>>> drivers/mmc/card/block.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>> index 452782b..d9e3c45 100644
>>> --- a/drivers/mmc/card/block.c
>>> +++ b/drivers/mmc/card/block.c
>>> @@ -1366,7 +1366,8 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>>> bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
>>> (req->cmd_flags & REQ_META)) &&
>>> (rq_data_dir(req) == WRITE) &&
>>> - (md->flags & MMC_BLK_REL_WR);
>>> + (md->flags & MMC_BLK_REL_WR) &&
>>> + !(card->quirks & MMC_QUIRK_BLK_NO_CMD23);
>>
>> Hi Yong,
>>
>> pls check that code below.
>>
>> MMC_BLK_REL_WR will not be enabled if we know this card CANNOT support
>> CMD23 form SCR. AND， "card->quirks & MMC_QUIRK_BLK_NO_CMD23" would be
>> checked here as well. So I think your code is unnecessary.
>>
>> if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
>> (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
>> do_data_tag)) {
>> brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
>> brq->sbc.arg = brq->data.blocks |
>> (do_rel_wr ? (1 << 31) : 0) |
>> (do_data_tag ? (1 << 29) : 0);
>> brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
>> brq->mrq.sbc = &brq->sbc;
>> }
>>
>> Thanks.
>> Shawn
>>
>>>
>>> memset(brq, 0, sizeof(struct mmc_blk_request));
>>> brq->mrq.cmd = &brq->cmd;
>>>
>>
>>
>> --
>> Shawn Lin
>>
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>


-- 
Shawn Lin

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