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Commit c9b0cef2 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Chris Ball
Browse files

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: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 71d111cd

drivers/mmc/host/sh_mmcif.c

+18 −9
Original line number Diff line number Diff line
@@ -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->card_present) {

				sh_mmcif_release_dma(host);

				host->card_present = false;

			}

		}

		if (host->power) {

			pm_runtime_put(&host->pd->dev);

				sh_mmcif_release_dma(host);

			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;