diff options
| author | San Mehat <san@google.com> | 2009-07-30 08:21:19 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2012-08-10 14:19:57 -0400 |
| commit | 5b260409501c72e2c5fc2b872edfa31b26c9dd9b (patch) | |
| tree | 04ab56d5e203d6fb044368eba60906770b3a4e0a /drivers/mmc | |
| parent | 5c2e7fb2575ee095a31c60885e6ee00f40c23a4f (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 3b1f783bf924..ebb4afe6c702 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" help diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 390b7c59eefb..badc57644c9b 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -1384,12 +1384,22 @@ 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); @@ -1779,6 +1789,9 @@ 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; @@ -1804,6 +1817,9 @@ 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 497c9b97c125..a652a97c707e 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -2092,6 +2092,12 @@ 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. |