mirror of https://gitee.com/openkylin/linux.git
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>
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@ -175,6 +175,7 @@ struct sh_mmcif_host {
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enum mmcif_state state;
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spinlock_t lock;
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bool power;
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bool card_present;
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/* DMA support */
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struct dma_chan *chan_rx;
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@ -877,23 +878,23 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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spin_unlock_irqrestore(&host->lock, flags);
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if (ios->power_mode == MMC_POWER_UP) {
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if (p->set_pwr)
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p->set_pwr(host->pd, ios->power_mode);
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if (!host->power) {
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if (!host->card_present) {
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/* See if we also get DMA */
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sh_mmcif_request_dma(host, host->pd->dev.platform_data);
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pm_runtime_get_sync(&host->pd->dev);
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host->power = true;
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host->card_present = true;
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}
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} else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) {
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/* clock stop */
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sh_mmcif_clock_control(host, 0);
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if (ios->power_mode == MMC_POWER_OFF) {
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if (host->power) {
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pm_runtime_put(&host->pd->dev);
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if (host->card_present) {
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sh_mmcif_release_dma(host);
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host->power = false;
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host->card_present = false;
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}
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}
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if (host->power) {
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pm_runtime_put(&host->pd->dev);
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host->power = false;
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if (p->down_pwr)
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p->down_pwr(host->pd);
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}
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@ -901,8 +902,16 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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return;
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}
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if (ios->clock)
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if (ios->clock) {
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if (!host->power) {
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if (p->set_pwr)
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p->set_pwr(host->pd, ios->power_mode);
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pm_runtime_get_sync(&host->pd->dev);
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host->power = true;
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sh_mmcif_sync_reset(host);
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}
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sh_mmcif_clock_control(host, ios->clock);
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}
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host->bus_width = ios->bus_width;
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host->state = STATE_IDLE;
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