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mmc: sh_mmcif: maximize power saving

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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>
This commit is contained in:
Guennadi Liakhovetski 2011-05-26 15:33:30 +02:00 committed by Chris Ball
parent 71d111cd34
commit c9b0cef23f
1 changed files with 18 additions and 9 deletions
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27
drivers/mmc/host/sh_mmcif.c
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@ -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;