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@xxxxxx>
---
Patches have been submitted earlier for SDHCI to accomplish something
similar, but they have complicated dependencies upon other different
subsystems, especially on PCI. MMCIF is easier - it only exists in
different SoCs, so, this change should also be easier to review, verify
and test.
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;
--
1.7.2.5
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