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mmc: mmcblk: Add support for deferred SD bus resume

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Signed-off-by: San Mehat <san@google.com>

mmc: card: Add MMC_BLOCK_DEFERRED_RESUME option to Kconfig

Signed-off-by: San Mehat <san@google.com>
This commit is contained in:
San Mehat
2009-07-30 08:21:19 -07:00
committed by Colin Cross
parent 41d9d91eeb
commit 148c57a844
3 changed files with 31 additions and 0 deletions
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9
drivers/mmc/card/Kconfig
View File

@@ -50,6 +50,15 @@ config MMC_BLOCK_BOUNCE
If unsure, say Y here.
config MMC_BLOCK_DEFERRED_RESUME
bool "Deferr MMC layer resume until I/O is requested"
depends on MMC_BLOCK
default n
help
Say Y here to enable deferred MMC resume until I/O
is requested. This will reduce overall resume latency and
save power when theres an SD card inserted but not being used.
config SDIO_UART
tristate "SDIO UART/GPS class support"
help

16
drivers/mmc/card/block.c
View File

@@ -1379,12 +1379,22 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
return 0;
}
static int
mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card);
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
{
int ret;
struct mmc_blk_data *md = mq->data;
struct mmc_card *card = md->queue.card;
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
if (mmc_bus_needs_resume(card->host)) {
mmc_resume_bus(card->host);
mmc_blk_set_blksize(md, card);
}
#endif
if (req && !mq->mqrq_prev->req)
/* claim host only for the first request */
mmc_claim_host(card->host);
@@ -1771,6 +1781,9 @@ static int mmc_blk_probe(struct mmc_card *card)
mmc_set_drvdata(card, md);
mmc_fixup_device(card, blk_fixups);
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
mmc_set_bus_resume_policy(card->host, 1);
#endif
if (mmc_add_disk(md))
goto out;
@@ -1796,6 +1809,9 @@ static void mmc_blk_remove(struct mmc_card *card)
mmc_release_host(card->host);
mmc_blk_remove_req(md);
mmc_set_drvdata(card, NULL);
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
mmc_set_bus_resume_policy(card->host, 0);
#endif
}
#ifdef CONFIG_PM

6
drivers/mmc/core/core.c
View File

@@ -2050,6 +2050,12 @@ void mmc_rescan(struct work_struct *work)
host->detect_change = 0;
/* If the card was removed the bus will be marked
* as dead - extend the wakelock so userspace
* can respond */
if (host->bus_dead)
extend_wakelock = 1;
/*
* Let mmc_bus_put() free the bus/bus_ops if we've found that
* the card is no longer present.