Commit 064f7e58 authored by Krishna Konda's avatar Krishna Konda Committed by Ulf Hansson
Browse files

mmc: core: expose info about enhanced rpmb support 



Following eMMC JEDEC JESD84-B51 standard, an enhanced form of
rpmb is supported. What this enhanced mode supports is in addition
to be able to write one rpmb or two rpmb frames at a time,
32 frames can be written at a time.

Expose this information present in ext csd field so that the
user space application that wants to make use of this can do so.

Signed-off-by: default avatarKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: default avatarVeerabhadrarao Badiganti <vbadigan@codeaurora.org>
Link: https://lore.kernel.org/r/1588341189-4371-1-git-send-email-vbadigan@codeaurora.org


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 1dc5a615

drivers/mmc/core/mmc.c

+6 −0
Original line number Diff line number Diff line
@@ -647,6 +647,9 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) 
				 mmc_hostname(card->host),

				 card->ext_csd.cmdq_depth);

		}

		card->ext_csd.enhanced_rpmb_supported =

					(card->ext_csd.rel_param &

					 EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR);

	}

out:

	return err;
@@ -786,6 +789,8 @@ MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 
		card->ext_csd.enhanced_area_offset);

MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);

MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);

MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n",

	card->ext_csd.enhanced_rpmb_supported);

MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);

MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);

MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
@@ -843,6 +848,7 @@ static struct attribute *mmc_std_attrs[] = { 
	&dev_attr_enhanced_area_offset.attr,

	&dev_attr_enhanced_area_size.attr,

	&dev_attr_raw_rpmb_size_mult.attr,

	&dev_attr_enhanced_rpmb_supported.attr,

	&dev_attr_rel_sectors.attr,

	&dev_attr_ocr.attr,

	&dev_attr_rca.attr,

include/linux/mmc/card.h

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ struct mmc_ext_csd { 
	u8			sec_feature_support;

	u8			rel_sectors;

	u8			rel_param;

	bool			enhanced_rpmb_supported;

	u8			part_config;

	u8			cache_ctrl;

	u8			rst_n_function;

include/linux/mmc/mmc.h

+1 −0
Original line number Diff line number Diff line
@@ -325,6 +325,7 @@ static inline bool mmc_ready_for_data(u32 status) 
 */



#define EXT_CSD_WR_REL_PARAM_EN		(1<<2)

#define EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR	(1<<4)



#define EXT_CSD_BOOT_WP_B_PWR_WP_DIS	(0x40)

#define EXT_CSD_BOOT_WP_B_PERM_WP_DIS	(0x10)

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