diff options
| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2011-05-26 13:33:30 (GMT) |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-07-21 14:35:06 (GMT) |
| commit | c9b0cef23f8d2a16c97623d25d6e8f8e93a56e4b (patch) | |
| tree | e611d4955d57d3be4593bbc1fa40c1a6468bbd40 /drivers | |
| parent | 71d111cd34ee119c93d056ad9e84dc0e82367f82 (diff) | |
| download | linux-c9b0cef23f8d2a16c97623d25d6e8f8e93a56e4b.tar.xz | |
mmc: sh_mmcif: maximize power saving
This patch uses runtime PM to allow the system to power down the MMC
controller, when the MMC closk is switched off.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sh_mmcif.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c index 14f8edb..557886b 100644 --- a/drivers/mmc/host/sh_mmcif.c +++ b/drivers/mmc/host/sh_mmcif.c @@ -175,6 +175,7 @@ struct sh_mmcif_host { enum mmcif_state state; spinlock_t lock; bool power; + bool card_present; /* DMA support */ struct dma_chan *chan_rx; @@ -877,23 +878,23 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) spin_unlock_irqrestore(&host->lock, flags); if (ios->power_mode == MMC_POWER_UP) { - if (p->set_pwr) - p->set_pwr(host->pd, ios->power_mode); - if (!host->power) { + if (!host->card_present) { /* See if we also get DMA */ sh_mmcif_request_dma(host, host->pd->dev.platform_data); - pm_runtime_get_sync(&host->pd->dev); - host->power = true; + host->card_present = true; } } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) { /* clock stop */ sh_mmcif_clock_control(host, 0); if (ios->power_mode == MMC_POWER_OFF) { - if (host->power) { - pm_runtime_put(&host->pd->dev); + if (host->card_present) { sh_mmcif_release_dma(host); - host->power = false; + host->card_present = false; } + } + if (host->power) { + pm_runtime_put(&host->pd->dev); + host->power = false; if (p->down_pwr) p->down_pwr(host->pd); } @@ -901,8 +902,16 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) return; } - if (ios->clock) + if (ios->clock) { + if (!host->power) { + if (p->set_pwr) + p->set_pwr(host->pd, ios->power_mode); + pm_runtime_get_sync(&host->pd->dev); + host->power = true; + sh_mmcif_sync_reset(host); + } sh_mmcif_clock_control(host, ios->clock); + } host->bus_width = ios->bus_width; host->state = STATE_IDLE; |