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authorSeungwon Jeon <tgih.jun@samsung.com>2013-02-06 17:01:43 +0900
committerChris Ball <cjb@laptop.org>2013-02-24 14:37:15 -0500
commitabd9ac144947d9a604beb763339e2f77ce8bec79 (patch)
treea38469db95588f02587c28743b5719bbb83f863d /drivers
parentac48653cec7dd9a5606a7057413a880d6880d5d3 (diff)
downloadlinux-abd9ac144947d9a604beb763339e2f77ce8bec79.tar.gz
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> Reviewed-by: Maya Erez <merez@codeaurora.org> Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org> Reviewed-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/core/mmc.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 8a3ad602a87..c8f3d6e0684 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -538,6 +538,11 @@ 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;
}
@@ -1275,6 +1280,29 @@ 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;