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Commit b097e07f authored Feb 06, 2015 by Adrian Hunter Committed by Ulf Hansson Jun 01, 2015

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: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 3853a042

drivers/mmc/core/mmc.c

+1 −0

Original line number	Original line	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 =		card->ext_csd.raw_trim_mult =
	ext_csd[EXT_CSD_TRIM_MULT];		ext_csd[EXT_CSD_TRIM_MULT];
	card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];		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 (card->ext_csd.rev >= 4) {
	if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &		if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
	EXT_CSD_PART_SETTING_COMPLETED)		EXT_CSD_PART_SETTING_COMPLETED)

include/linux/mmc/card.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -97,6 +97,7 @@ struct mmc_ext_csd {
	u8 raw_erased_mem_count; /* 181 */		u8 raw_erased_mem_count; /* 181 */
	u8 raw_ext_csd_structure; /* 194 */		u8 raw_ext_csd_structure; /* 194 */
	u8 raw_card_type; /* 196 */		u8 raw_card_type; /* 196 */
			u8 raw_driver_strength; /* 197 */
	u8 out_of_int_time; /* 198 */		u8 out_of_int_time; /* 198 */
	u8 raw_pwr_cl_52_195; /* 200 */		u8 raw_pwr_cl_52_195; /* 200 */
	u8 raw_pwr_cl_26_195; /* 201 */		u8 raw_pwr_cl_26_195; /* 201 */

include/linux/mmc/mmc.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -302,6 +302,7 @@ struct _mmc_csd {
	#define EXT_CSD_REV 192 /* RO */		#define EXT_CSD_REV 192 /* RO */
	#define EXT_CSD_STRUCTURE 194 /* RO */		#define EXT_CSD_STRUCTURE 194 /* RO */
	#define EXT_CSD_CARD_TYPE 196 /* 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_OUT_OF_INTERRUPT_TIME 198 /* RO */
	#define EXT_CSD_PART_SWITCH_TIME 199 /* RO */		#define EXT_CSD_PART_SWITCH_TIME 199 /* RO */
	#define EXT_CSD_PWR_CL_52_195 200 /* RO */		#define EXT_CSD_PWR_CL_52_195 200 /* RO */