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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: Alexey Skidanov <alexey.skidanov@sandisk.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Alexey Skidanov 2015-01-29 10:49:43 +02:00 committed by Ulf Hansson
parent 14460dbaf7
commit 0501be6429
4 changed files with 12 additions and 5 deletions
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2
drivers/mmc/core/core.c
View File

@ -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);

8
drivers/mmc/core/mmc.c
View File

@ -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));
}

2
include/linux/mmc/card.h
View File

@ -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 */

5
include/linux/mmc/mmc.h
View File

@ -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
*/