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Commit b23cf0bd authored by Seungwon Jeon's avatar Seungwon Jeon Committed by Chris Ball
Browse files

mmc: core: Add default timeout value for CMD6 



EXT_CSD[248] includes the default maximum timeout for CMD6.
This field is added at eMMC4.5 Spec. And it can be used for default
timeout except for some operations which don't define the timeout
(i.e. background operation, sanitize, flush cache) in eMMC4.5 Spec.

Signed-off-by: default avatarSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: default avatarJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 66fd8ad5

drivers/mmc/core/mmc.c

+12 −4
Original line number Diff line number Diff line
@@ -458,6 +458,12 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) 
	else

		card->erased_byte = 0x0;



	if (card->ext_csd.rev >= 6)

		card->ext_csd.generic_cmd6_time = 10 *

			ext_csd[EXT_CSD_GENERIC_CMD6_TIME];

	else

		card->ext_csd.generic_cmd6_time = 0;



out:

	return err;

}
@@ -801,7 +807,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
	 */

	if (card->ext_csd.enhanced_area_en) {

		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,

				 EXT_CSD_ERASE_GROUP_DEF, 1, 0);

				 EXT_CSD_ERASE_GROUP_DEF, 1,

				 card->ext_csd.generic_cmd6_time);



		if (err && err != -EBADMSG)

			goto free_card;
@@ -844,7 +851,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
	if ((card->ext_csd.hs_max_dtr != 0) &&

		(host->caps & MMC_CAP_MMC_HIGHSPEED)) {

		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,

				 EXT_CSD_HS_TIMING, 1, 0);

				 EXT_CSD_HS_TIMING, 1,

				 card->ext_csd.generic_cmd6_time);

		if (err && err != -EBADMSG)

			goto free_card;
@@ -924,7 +932,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
			err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,

					 EXT_CSD_BUS_WIDTH,

					 ext_csd_bits[idx][0],

					 0);

					 card->ext_csd.generic_cmd6_time);

			if (!err) {

				mmc_set_bus_width(card->host, bus_width);
@@ -955,7 +963,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
			err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,

					 EXT_CSD_BUS_WIDTH,

					 ext_csd_bits[idx][1],

					 0);

					 card->ext_csd.generic_cmd6_time);

		}

		if (err) {

			printk(KERN_WARNING "%s: switch to bus width %d ddr %d "

include/linux/mmc/card.h

+1 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ struct mmc_ext_csd { 
	u8			rst_n_function;

	unsigned int		part_time;		/* Units: ms */

	unsigned int		sa_timeout;		/* Units: 100ns */

	unsigned int		generic_cmd6_time;	/* Units: 10ms */

	unsigned int		hs_max_dtr;

	unsigned int		sectors;

	unsigned int		card_type;

include/linux/mmc/mmc.h

+1 −0
Original line number Diff line number Diff line
@@ -305,6 +305,7 @@ struct _mmc_csd { 
#define EXT_CSD_PWR_CL_DDR_52_195	238	/* RO */

#define EXT_CSD_PWR_CL_DDR_52_360	239	/* RO */

#define EXT_CSD_POWER_OFF_LONG_TIME	247	/* RO */

#define EXT_CSD_GENERIC_CMD6_TIME	248	/* RO */



/*

 * EXT_CSD field definitions