linux-kernel - RE: [PATCH v6 1/3] mmc: core: Add packed command feature of eMMC4.5

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Message-ID: <000001cd3d98$f015db60$d0419220$@codeaurora.org>
Date:	Tue, 29 May 2012 18:15:29 +0530
From:	"Subhash Jadavani" <subhashj@...eaurora.org>
To:	<merez@...eaurora.org>, "'Seungwon Jeon'" <tgih.jun@...sung.com>
Cc:	<linux-mmc@...r.kernel.org>, "'Chris Ball'" <cjb@...top.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 1/3] mmc: core: Add packed command feature of eMMC4.5



> -----Original Message-----
> From: linux-mmc-owner@...r.kernel.org [mailto:linux-mmc-
> owner@...r.kernel.org] On Behalf Of merez@...eaurora.org
> Sent: Tuesday, May 29, 2012 5:08 PM
> To: Seungwon Jeon
> Cc: linux-mmc@...r.kernel.org; 'Chris Ball'; merez@...eaurora.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH v6 1/3] mmc: core: Add packed command feature of
> eMMC4.5
> 
> > @@ -1244,6 +1249,25 @@ static int mmc_init_card(struct mmc_host *host,
> > u32 ocr,
> >  		}
> >  	}
> >
> > +	if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
> > +			(card->ext_csd.max_packed_writes > 0) &&
> > +			(card->ext_csd.max_packed_reads > 0)) {
> > +		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > +				EXT_CSD_EXP_EVENTS_CTRL,
> > +				EXT_CSD_PACKED_EVENT_EN,
> > +				card->ext_csd.generic_cmd6_time);
> > +		if (err && err != -EBADMSG)
> > +			goto free_card;
> > +		if (err) {
> > +			pr_warning("%s: Enabling packed event failed\n",
> > +					mmc_hostname(card->host));
> > +			card->ext_csd.packed_event_en = 0;
> > +			err = 0;
> > +		} else {
> > +			card->ext_csd.packed_event_en = 1;
> > +		}
> > +	}
> > +
> The above shoud not be performed in case of resume. Therefore it needs to
be
> done only if (!oldcard)

Maya,
What if eMMC power (VCC and VCCQ) was removed during suspend? Then in that
case during resume, we have to send this mmc_switch() command again. So this
operation should not be under "if (!oldcard)" check.

Regards,
Subhash


> 
> Thanks,
> Maya Erez
> Consultant for Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
> 
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