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mmc: add packed command feature of eMMC4.5

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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 <[email protected]>
Reviewed-by: Maya Erez <[email protected]>
Reviewed-by: Subhash Jadavani <[email protected]>
Reviewed-by: Namjae Jeon <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Seungwon Jeon 2013-02-06 17:01:43 +09:00 • committed by Chris Ball
commit abd9ac1449
4 changed files with 48 additions and 2 deletions
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28
drivers/mmc/core/mmc.c
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@ -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;