linux-kernel - [PATCH v2 0001/0002] mmc: check EXT_CSD_PARTITION_SETTING

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Message-ID: <53F1DA3D.1030500@neotion.com>
Date:	Mon, 18 Aug 2014 12:49:33 +0200
From:	Grégory Soutadé <gsoutade@...tion.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Chris Ball <chris@...ntf.net>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 0001/0002] mmc: check EXT_CSD_PARTITION_SETTING_COMPLETED
 before creating partitions

Replace "enhanced_area_en" attribute by "partition_setting_completed".
It was used whether or not enhanced user area is defined and without checks of
EXT_CSD_PARTITION_SETTING_COMPLETED bit.

Signed-off-by: Grégory Soutadé <gsoutade@...tion.com>
---
 drivers/mmc/core/mmc.c   |    8 +++++++-
 include/linux/mmc/card.h |    2 +-
 include/linux/mmc/mmc.h  |    2 ++
 3 files changed, 10 insertions(+), 2 deletions(-)

>>From commit 33caee39925b887a99a2400dc5c980097c3573f9 in master linux tree.

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 793c6f7..ef25d91 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -403,6 +403,12 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		ext_csd[EXT_CSD_TRIM_MULT];
 	card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 	if (card->ext_csd.rev >= 4) {
+		if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
+		    EXT_CSD_PART_SETTING_COMPLETED) {
+			card->ext_csd.partition_setting_completed = 1;
+		} else {
+			card->ext_csd.partition_setting_completed = 0;
+		}
 		/*
 		 * Enhanced area feature support -- check whether the eMMC
 		 * card has the Enhanced area enabled.  If so, export enhanced
@@ -1309,7 +1315,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 	 * bit.  This bit will be lost every time after a reset or power off.
 	 */
-	if (card->ext_csd.enhanced_area_en ||
+	if (card->ext_csd.partition_setting_completed ||
 	    (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 				 EXT_CSD_ERASE_GROUP_DEF, 1,
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index d424b9d..38175be 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -74,7 +74,7 @@ struct mmc_ext_csd {
 	unsigned int		sec_trim_mult;	/* Secure trim multiplier  */
 	unsigned int		sec_erase_mult;	/* Secure erase multiplier */
 	unsigned int		trim_timeout;		/* In milliseconds */
-	bool			enhanced_area_en;	/* enable bit */
+	bool			partition_setting_completed;	/* enable bit */
 	unsigned long long	enhanced_area_offset;	/* Units: Byte */
 	unsigned int		enhanced_area_size;	/* Units: KB */
 	unsigned int		cache_size;		/* Units: KB */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 64ec963..78753bc 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -281,6 +281,7 @@ struct _mmc_csd {
 #define EXT_CSD_EXP_EVENTS_CTRL		56	/* R/W, 2 bytes */
 #define EXT_CSD_DATA_SECTOR_SIZE	61	/* R */
 #define EXT_CSD_GP_SIZE_MULT		143	/* R/W */
+#define EXT_CSD_PARTITION_SETTING_COMPLETED 155	/* R/W */
 #define EXT_CSD_PARTITION_ATTRIBUTE	156	/* R/W */
 #define EXT_CSD_PARTITION_SUPPORT	160	/* RO */
 #define EXT_CSD_HPI_MGMT		161	/* R/W */
@@ -349,6 +350,7 @@ struct _mmc_csd {
 #define EXT_CSD_PART_CONFIG_ACC_RPMB	(0x3)
 #define EXT_CSD_PART_CONFIG_ACC_GP0	(0x4)

+#define EXT_CSD_PART_SETTING_COMPLETED	(0x1)
 #define EXT_CSD_PART_SUPPORT_PART_EN	(0x1)

 #define EXT_CSD_CMD_SET_NORMAL		(1<<0)
-- 
1.7.9.5


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