diff options
| author | San Mehat <san@google.com> | 2009-07-30 08:21:19 -0700 |
|---|---|---|
| committer | Arve Hjønnevåg <arve@android.com> | 2013-03-11 15:22:00 -0700 |
| commit | d74737649147e77a61e95810f0df69fc9bc32e83 (patch) | |
| tree | 1f15b329f6a095ba88600c03ebf8cf925d7975fe /drivers/mmc | |
| parent | 60681abce70441b7b7c7b3c81ee748128f6d31c0 (diff) | |
mmc: mmcblk: Add support for deferred SD bus resume
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/card/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/mmc/card/block.c | 16 | ||||
| -rw-r--r-- | drivers/mmc/core/core.c | 6 |
3 files changed, 31 insertions, 0 deletions
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig index 5562308699bc..79d82124413f 100644 --- a/drivers/mmc/card/Kconfig +++ b/drivers/mmc/card/Kconfig @@ -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" depends on TTY diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 593c38261b87..d7a176c9f6bc 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -1882,6 +1882,9 @@ 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; @@ -1890,6 +1893,13 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) struct mmc_host *host = card->host; unsigned long flags; +#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); @@ -2321,6 +2331,9 @@ 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; @@ -2346,6 +2359,9 @@ 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 diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 9b191ea6de44..c137bc1e5356 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -2387,6 +2387,12 @@ 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. |