Commit b097e07f authored by Adrian Hunter's avatar Adrian Hunter Committed by Ulf Hansson
Browse files

mmc: mmc: Read card's valid driver strength mask 



In preparation for supporing drive strength selection
for eMMC, read the card's valid driver strengths.

Note that though the SD spec uses the term "drive strength",
the JEDEC eMMC spec uses the term "driver strength".

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 3853a042

drivers/mmc/core/mmc.c

+1 −0
Original line number Diff line number Diff line
@@ -437,6 +437,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) 
	card->ext_csd.raw_trim_mult =

		ext_csd[EXT_CSD_TRIM_MULT];

	card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];

	card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];

	if (card->ext_csd.rev >= 4) {

		if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &

		    EXT_CSD_PART_SETTING_COMPLETED)

include/linux/mmc/card.h

+1 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ struct mmc_ext_csd { 
	u8			raw_erased_mem_count;	/* 181 */

	u8			raw_ext_csd_structure;	/* 194 */

	u8			raw_card_type;		/* 196 */

	u8			raw_driver_strength;	/* 197 */

	u8			out_of_int_time;	/* 198 */

	u8			raw_pwr_cl_52_195;	/* 200 */

	u8			raw_pwr_cl_26_195;	/* 201 */

include/linux/mmc/mmc.h

+1 −0
Original line number Diff line number Diff line
@@ -302,6 +302,7 @@ struct _mmc_csd { 
#define EXT_CSD_REV			192	/* RO */

#define EXT_CSD_STRUCTURE		194	/* RO */

#define EXT_CSD_CARD_TYPE		196	/* RO */

#define EXT_CSD_DRIVER_STRENGTH		197	/* RO */

#define EXT_CSD_OUT_OF_INTERRUPT_TIME	198	/* RO */

#define EXT_CSD_PART_SWITCH_TIME        199     /* RO */

#define EXT_CSD_PWR_CL_52_195		200	/* RO */

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