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Message-ID: <CAGxe1ZG+3kFXMBqVyVBahM5PhgsYRn9crXgbtBs9FE7o6wFqMg@mail.gmail.com>
Date: Wed, 2 Nov 2011 06:58:10 -0400
From: Girish K S <girish.shivananjappa@...aro.org>
To: Seungwon Jeon <tgih.jun@...sung.com>
Cc: linux-mmc@...r.kernel.org, Chris Ball <cjb@...top.org>,
linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
kgene.kim@...sung.com, dh.han@...sung.com
Subject: Re: [PATCH 1/2] mmc: core: Add packed command feature of eMMC4.5
Hi,
On 2 November 2011 04:01, Seungwon Jeon <tgih.jun@...sung.com> wrote:
> 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@...sung.com>
> ---
> drivers/mmc/core/mmc.c | 22 ++++++++++++++++++++++
> include/linux/mmc/card.h | 3 +++
> include/linux/mmc/host.h | 1 +
> include/linux/mmc/mmc.h | 15 +++++++++++++++
> 4 files changed, 41 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 3627044..bf4fa6e 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -487,6 +487,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
> ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
> ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
> +
> + 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];
> }
>
> out:
> @@ -1072,6 +1075,25 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> card->ext_csd.cache_ctrl = err ? 0 : 1;
> }
>
> + if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
> + (card->ext_csd.max_packed_writes > 0) &&
> + (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 415f2db..70ea3d6 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -52,6 +52,9 @@ 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 a3ac9c4..d2e4210 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -242,6 +242,7 @@ struct mmc_host {
> #define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
> #define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
> #define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
> +#define MMC_CAP2_PACKED_CMD (1 << 4) /* Allow packed command */
>
> 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 0e71356..1b94c4f 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -138,6 +138,7 @@ 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
> @@ -273,6 +274,10 @@ 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_GP_SIZE_MULT 143 /* R/W */
> #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
> #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
> @@ -313,6 +318,8 @@ struct _mmc_csd {
> #define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
> #define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
> #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
> +#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
> +#define EXT_CSD_MAX_PACKED_READS 501 /* RO */
> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>
> /*
> @@ -364,6 +371,14 @@ 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
>This patch gives some warnings and error, when checkpatch is run on this.
yet to review more, will do once i return from Q4 connect
> --
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