V2- The datatype of the cmd6_timeout is changed from u8 to unsigned int,
as it can hold a value upto 255*10=2550 and the data assignment in
mmc_switch function.
This patch adds the code to handle the default timeout
for switch command.
For eMMC 4.5 devices if timeout is not specified for the switch
command while accessing a specific field,then the default timeout
shall be used to timeout. Specification says there is no timeout
defined while accessing BKOPS_START, SANITIZE_START, FLUSH_CACHE
field(so these fields are excluded).
Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 5 +++++
drivers/mmc/core/mmc_ops.c | 8 ++++++++
include/linux/mmc/card.h | 1 +
include/linux/mmc/mmc.h | 4 ++++
4 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 5700b1c..5b9fb6a 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -405,6 +405,11 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
if (card->ext_csd.rev >= 5)
card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
+ if (card->ext_csd.rev > 5) {
+ /* (eMMC 4.5)timeout is expressed in units of 10 ms*/
+ card->ext_csd.cmd6_timeout = ext_csd[EXT_CSD_CMD6_TIME]*10;
+ }
+
if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
card->erased_byte = 0xFF;
else
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 770c3d0..c4d82f4 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -394,6 +394,14 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
cmd.cmd_timeout_ms = timeout_ms;
+ /* timeout is not defined for below command indexes (eMMC 4.5) */
+ if ((timeout_ms == 0) &&
+ (card->ext_csd.rev > 5) &&
+ (index != EXT_CSD_BKOPS_START) &&
+ (index != EXT_CSD_SANITIZE_START) &&
+ (index != EXT_CSD_FLUSH_CACHE))
+ cmd.cmd_timeout_ms = card->ext_csd.cmd6_timeout;
+
err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
if (err)
return err;
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index b460fc2..ef88412 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -50,6 +50,7 @@ struct mmc_ext_csd {
u8 rel_sectors;
u8 rel_param;
u8 part_config;
+ unsigned int cmd6_timeout; /* timeout in ms */
unsigned int part_time; /* Units: ms */
unsigned int sa_timeout; /* Units: 100ns */
unsigned int hs_max_dtr;
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 5a794cb..a23f836 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -270,8 +270,11 @@ struct _mmc_csd {
* EXT_CSD fields
*/
+#define EXT_CSD_FLUSH_CACHE 32 /* R/W */
#define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
#define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
+#define EXT_CSD_BKOPS_START 164 /* R/W */
+#define EXT_CSD_SANITIZE_START 165 /* R/W */
#define EXT_CSD_WR_REL_PARAM 166 /* RO */
#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
#define EXT_CSD_PART_CONFIG 179 /* R/W */
@@ -293,6 +296,7 @@ struct _mmc_csd {
#define EXT_CSD_SEC_ERASE_MULT 230 /* RO */
#define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */
#define EXT_CSD_TRIM_MULT 232 /* RO */
+#define EXT_CSD_CMD6_TIME 248 /* RO */
/*
* EXT_CSD field definitions
--
1.7.1
--
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