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

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Message-id: <001d01cd3dfa$07f83dc0$17e8b940$%jun@samsung.com>
Date:	Wed, 30 May 2012 09:20:34 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	merez@...eaurora.org
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

Maya Erez <merez@...eaurora.org> wrote:
> > @@ -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)
Could you explain the reason for this?

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