Commit 0501be64 authored by Alexey Skidanov's avatar Alexey Skidanov Committed by Ulf Hansson
Browse files

mmc: Resolve BKOPS compatability issue 



This patch is coming to fix compatibility issue of BKOPS_EN  field of EXT_CSD.
In eMMC-5.1, BKOPS_EN was changed, and now it has two operational bits:
Bit 0 - MANUAL_EN
Bit 1 - AUTO_EN
In previous eMMC revisions, only Bit 0 was supported.

Signed-off-by: default avatarAlexey Skidanov <alexey.skidanov@sandisk.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 14460dba

drivers/mmc/core/core.c

+1 −1
Original line number Diff line number Diff line
@@ -275,7 +275,7 @@ void mmc_start_bkops(struct mmc_card *card, bool from_exception) 


	BUG_ON(!card);



	if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))

	if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))

		return;



	err = mmc_read_bkops_status(card);

drivers/mmc/core/mmc.c

+5 −3
Original line number Diff line number Diff line
@@ -483,11 +483,13 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) 
		/* check whether the eMMC card supports BKOPS */

		if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {

			card->ext_csd.bkops = 1;

			card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];

			card->ext_csd.man_bkops_en =

					(ext_csd[EXT_CSD_BKOPS_EN] &

						EXT_CSD_MANUAL_BKOPS_MASK);

			card->ext_csd.raw_bkops_status =

				ext_csd[EXT_CSD_BKOPS_STATUS];

			if (!card->ext_csd.bkops_en)

				pr_info("%s: BKOPS_EN bit is not set\n",

			if (!card->ext_csd.man_bkops_en)

				pr_info("%s: MAN_BKOPS_EN bit is not set\n",

					mmc_hostname(card->host));

		}

include/linux/mmc/card.h

+1 −1
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ struct mmc_ext_csd { 
	bool			hpi;			/* HPI support bit */

	unsigned int		hpi_cmd;		/* cmd used as HPI */

	bool			bkops;		/* background support bit */

	bool			bkops_en;	/* background enable bit */

	bool			man_bkops_en;	/* manual bkops enable bit */

	unsigned int            data_sector_size;       /* 512 bytes or 4KB */

	unsigned int            data_tag_unit_size;     /* DATA TAG UNIT size */

	unsigned int		boot_ro_lock;		/* ro lock support */

include/linux/mmc/mmc.h

+5 −0
Original line number Diff line number Diff line
@@ -427,6 +427,11 @@ struct _mmc_csd { 
 */

#define EXT_CSD_BKOPS_LEVEL_2		0x2



/*

 * BKOPS modes

 */

#define EXT_CSD_MANUAL_BKOPS_MASK	0x01



/*

 * MMC_SWITCH access modes

 */

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