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

[Subhash Jadavani]

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
> 


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