Hello Mr Jeon,
In case if the timeout is specified by the
calling function, the code in this patch will not be executed. But if
some command other than the three are called with 0, then this code
will make sure that atleast the default value is used to timeout.
regards
Girish K S
On 1 September 2011 11:50, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> Hi Girish,
>
> Girish K S wrote:
>>
>> V2- The datatype of the cmd6_timeout is changed from u8 to unsigned int,
>> as it can hold a value upto 255*10=2550.
>> 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;
>> +
> mmc_switch doesn't need to take over '0' value for timeout_ms except for undefined timeout(Background operation, sanitize, etc)
> It is possible and good to pass the argument of specific timeout_ms(including default cmd6 timeout) explicitly rather than '0',
> if timeout value for cmd6 is defined.
> Then, mmc_switch maybe doesn't need to handle timeout for some exception case.
>
>> 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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>
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