RE: [PATCH RESEND v7 1/3] mmc: core: Add packed command feature of eMMC4.5

From: merez
Date: Mon Jun 18 2012 - 07:55:04 EST

Looks good to me.
Reviewed-by: Maya Erez <merez@xxxxxxxxxxxxxx>

On Mon, June 18, 2012 4:34 am, Subhash Jadavani wrote:
> Looks good to me.
> Reviewed-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
>
>> -----Original Message-----
>> From: Seungwon Jeon [mailto:tgih.jun@xxxxxxxxxxx]
>> Sent: Monday, June 18, 2012 11:13 AM
>> To: linux-mmc@xxxxxxxxxxxxxxx
>> Cc: linux-kernel@xxxxxxxxxxxxxxx; 'Chris Ball'; 'Maya Erez'; 'Subhash
>> Jadavani';
>> 'S, Venkatraman'
>> Subject: [PATCH RESEND v7 1/3] mmc: core: Add packed command feature of
>> eMMC4.5
>>
>> This patch adds packed command feature of eMMC4.5.
>> The maximum number for packing read(or write) is offered and exception
>> event relevant to packed command which is used for error handling is
>> enabled.
>> If host wants to use this feature, MMC_CAP2_PACKED_CMD should be set.
>>
>> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
>> ---
>> drivers/mmc/core/mmc.c | 25 +++++++++++++++++++++++++
>> include/linux/mmc/card.h | 3 +++
>> include/linux/mmc/host.h | 4 ++++
>> include/linux/mmc/mmc.h | 15 +++++++++++++++
>> 4 files changed, 47 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index
>> 258b203..bfb271f 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -516,6 +516,11 @@ static int mmc_read_ext_csd(struct mmc_card *card,
>> u8 *ext_csd)
>> } else {
>> card->ext_csd.data_tag_unit_size = 0;
>> }
>> +
>> + card->ext_csd.max_packed_writes =
>> + ext_csd[EXT_CSD_MAX_PACKED_WRITES];
>> + card->ext_csd.max_packed_reads =
>> + ext_csd[EXT_CSD_MAX_PACKED_READS];
>> } else {
>> card->ext_csd.data_sector_size = 512;
>> }
>> @@ -1246,6 +1251,26 @@ static int mmc_init_card(struct mmc_host *host,
>> u32 ocr,
>> }
>> }
>>
>> + if ((host->caps2 & MMC_CAP2_PACKED_WR &&
>> + card->ext_csd.max_packed_writes > 0) ||
>> + (host->caps2 & MMC_CAP2_PACKED_RD &&
>> + card->ext_csd.max_packed_reads > 0)) {
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_EXP_EVENTS_CTRL,
>> + EXT_CSD_PACKED_EVENT_EN,
>> + card->ext_csd.generic_cmd6_time);
>> + if (err && err != -EBADMSG)
>> + goto free_card;
>> + if (err) {
>> + pr_warning("%s: Enabling packed event failed\n",
>> + mmc_hostname(card->host));
>> + card->ext_csd.packed_event_en = 0;
>> + err = 0;
>> + } else {
>> + card->ext_csd.packed_event_en = 1;
>> + }
>> + }
>> +
>> if (!oldcard)
>> host->card = card;
>>
>> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index
>> d76513b..4aeb4e9 100644
>> --- a/include/linux/mmc/card.h
>> +++ b/include/linux/mmc/card.h
>> @@ -53,6 +53,9 @@ struct mmc_ext_csd {
>> u8 part_config;
>> u8 cache_ctrl;
>> u8 rst_n_function;
>> + u8 max_packed_writes;
>> + u8 max_packed_reads;
>> + u8 packed_event_en;
>> unsigned int part_time; /* Units: ms */
>> unsigned int sa_timeout; /* Units: 100ns */
>> unsigned int generic_cmd6_time; /* Units: 10ms */
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index
>> 0707d22..9d0d946 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -238,6 +238,10 @@ struct mmc_host {
>> #define MMC_CAP2_BROKEN_VOLTAGE (1 << 7) /* Use the broken
>> voltage */
>> #define MMC_CAP2_DETECT_ON_ERR (1 << 8) /* On I/O err check card
>> removal */
>> #define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase size */
>> +#define MMC_CAP2_PACKED_RD (1 << 10) /* Allow packed read
>> */
>> +#define MMC_CAP2_PACKED_WR (1 << 11) /* Allow packed write
>> */
>> +#define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
>> + MMC_CAP2_PACKED_WR) /* Allow packed
>> commands */
>>
>> mmc_pm_flag_t pm_caps; /* supported pm
>> features */
>> unsigned int power_notify_type;
>> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index
>> d425cab..254901a 100644
>> --- a/include/linux/mmc/mmc.h
>> +++ b/include/linux/mmc/mmc.h
>> @@ -139,6 +139,7 @@ static inline bool mmc_op_multi(u32 opcode)
>> #define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits)
>> */
>> #define R1_READY_FOR_DATA (1 << 8) /* sx, a */
>> #define R1_SWITCH_ERROR (1 << 7) /* sx, c */
>> +#define R1_EXP_EVENT (1 << 6) /* sr, a */
>> #define R1_APP_CMD (1 << 5) /* sr, c */
>>
>> #define R1_STATE_IDLE 0
>> @@ -274,6 +275,10 @@ struct _mmc_csd {
>> #define EXT_CSD_FLUSH_CACHE 32 /* W */
>> #define EXT_CSD_CACHE_CTRL 33 /* R/W */
>> #define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
>> +#define EXT_CSD_PACKED_FAILURE_INDEX 35 /* RO */
>> +#define EXT_CSD_PACKED_CMD_STATUS 36 /* RO */
>> +#define EXT_CSD_EXP_EVENTS_STATUS 54 /* RO, 2 bytes */
>> +#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_ATTRIBUTE 156 /* R/W */
>> @@ -318,6 +323,8 @@ struct _mmc_csd {
>> #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
>> #define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */
>> #define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */
>> +#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
>> +#define EXT_CSD_MAX_PACKED_READS 501 /* RO */
>> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>>
>> /*
>> @@ -377,6 +384,14 @@ struct _mmc_csd {
>> #define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
>> #define EXT_CSD_PWR_CL_8BIT_SHIFT 4
>> #define EXT_CSD_PWR_CL_4BIT_SHIFT 0
>> +
>> +#define EXT_CSD_PACKED_EVENT_EN (1 << 3)
>> +
>> +#define EXT_CSD_PACKED_FAILURE (1 << 3)
>> +
>> +#define EXT_CSD_PACKED_GENERIC_ERROR (1 << 0)
>> +#define EXT_CSD_PACKED_INDEXED_ERROR (1 << 1)
>> +
>> /*
>> * MMC_SWITCH access modes
>> */
>> --
>> 1.7.0.4
>>
>
>
>


--
Sent by consultant of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/