[U-Boot] [PATCH ] MMC: fix user capacity for partitioned eMMC card

[Jaehoon Chung <jh80.chung@samsung.com>]

Hi, Markus.

It's reasonable, looks good to me.

Acked-by: Jaehoon Chung <jh80.chung@samsung.com>

Best Regards,
Jaehoon Chung

On 11/21/2014 07:50 PM, Jaehoon Chung wrote:
> Hi, Markus.
> 
> On 11/18/2014 11:11 PM, Markus Niebel wrote:
>> From: Markus Niebel <Markus.Niebel@tq-group.com>
>>
>> if the card claims to be high capacity and the card
>> is partitioned the capacity shall still be read from
>> ext_csd SEC_COUNT even if the resulting capacity is
>> smaller than 2 GiB
> 
> I have one question. 
> "smaller than 2GiB" means the size after completed partition?
> 
> Best Regards,
> Jaehoon Chung
> 
>>
>> Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
>> ---
>>  drivers/mmc/mmc.c | 15 +++++++++++++++
>>  include/mmc.h     |  3 +++
>>  2 files changed, 18 insertions(+)
>>
>> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
>> index 44a4feb..24b0989 100644
>> --- a/drivers/mmc/mmc.c
>> +++ b/drivers/mmc/mmc.c
>> @@ -1022,6 +1022,21 @@ static int mmc_startup(struct mmc *mmc)
>>  			mmc->erase_grp_size =
>>  				ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] *
>>  					MMC_MAX_BLOCK_LEN * 1024;
>> +			/*
>> +			 * if high capacity and partition setting completed
>> +			 * SEC_COUNT is valid even if it is smaller than 2 GiB
>> +			 * JEDEC Standard JESD84-B45, 6.2.4
>> +			 */
>> +			if (mmc->high_capacity &&
>> +			    (ext_csd[EXT_CSD_PARTITION_SETTING] &
>> +			     EXT_CSD_PARTITION_SETTING_COMPLETED)) {
>> +				capacity = (ext_csd[EXT_CSD_SEC_CNT]) |
>> +					(ext_csd[EXT_CSD_SEC_CNT + 1] << 8) |
>> +					(ext_csd[EXT_CSD_SEC_CNT + 2] << 16) |
>> +					(ext_csd[EXT_CSD_SEC_CNT + 3] << 24);
>> +				capacity *= MMC_MAX_BLOCK_LEN;
>> +				mmc->capacity_user = capacity;
>> +			}
>>  		} else {
>>  			/* Calculate the group size from the csd value. */
>>  			int erase_gsz, erase_gmul;
>> diff --git a/include/mmc.h b/include/mmc.h
>> index d74a190..cb91565 100644
>> --- a/include/mmc.h
>> +++ b/include/mmc.h
>> @@ -147,6 +147,7 @@
>>   * EXT_CSD fields
>>   */
>>  #define EXT_CSD_GP_SIZE_MULT		143	/* R/W */
>> +#define EXT_CSD_PARTITION_SETTING	155	/* R/W */
>>  #define EXT_CSD_PARTITIONS_ATTRIBUTE	156	/* R/W */
>>  #define EXT_CSD_PARTITIONING_SUPPORT	160	/* RO */
>>  #define EXT_CSD_RST_N_FUNCTION		162	/* R/W */
>> @@ -197,6 +198,8 @@
>>  #define EXT_CSD_BOOT_BUS_WIDTH_RESET(x)	(x << 2)
>>  #define EXT_CSD_BOOT_BUS_WIDTH_WIDTH(x)	(x)
>>  
>> +#define EXT_CSD_PARTITION_SETTING_COMPLETED	(1 << 0)
>> +
>>  #define R1_ILLEGAL_COMMAND		(1 << 22)
>>  #define R1_APP_CMD			(1 << 5)
>>  
>>
> 
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