diff options
| author | Seungwon Jeon <tgih.jun@samsung.com> | 2013-02-06 17:01:43 +0900 |
|---|---|---|
| committer | Riham Haidar <rhaidar@nvidia.com> | 2013-03-13 16:26:21 -0700 |
| commit | 4e8a1b26c07dfab8c49f39a8a7c1efd1c94ff6a4 (patch) | |
| tree | 2510599958a4d84ba8e5787c9a8a8f571fe20799 /drivers/mmc | |
| parent | acd0330022c675b8c7b50b751c029ba93763b2a1 (diff) | |
mmc: 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@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
(cherry picked from commit abd9ac144947d9a604beb763339e2f77ce8bec79)
Bug 1242730
Change-Id: I739489b759f1b3d58e544307c2bed8572c091323
Signed-off-by: Naveen Kumar Arepalli <naveenk@nvidia.com>
Reviewed-on: http://git-master/r/206218
Reviewed-by: Riham Haidar <rhaidar@nvidia.com>
Tested-by: Riham Haidar <rhaidar@nvidia.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 0a0748cb5b97..a0644797f044 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -541,6 +541,11 @@ 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; } @@ -1325,6 +1330,29 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } } + /* + * The mandatory minimum values are defined for packed command. + * read: 5, write: 3 + */ + if (card->ext_csd.max_packed_writes >= 3 && + card->ext_csd.max_packed_reads >= 5 && + host->caps2 & MMC_CAP2_PACKED_CMD) { + 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_warn("%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; |