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Commit 3b292bb0 authored by Ulf Hansson's avatar Ulf Hansson
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mmc: tmio: Restructure ->set_ios() and adapt ->probe() to it 



An internal power state machine were beeing used to keep ->probe() and
->set_ios() in sync. Especially for handling specific scenarios while
using CONFIG_MMC_CLKGATE. Moreover dependency to CONFIG_MMC_CLKGATE
existed to handle runtime PM properly, which we moves away from here.

By removing the state machine and instead make ->set_ios() rely on the
information provided through the function's in-parameters, the code
becomes significantly simplier.

Additonally as a part of this rework we prepares for making the runtime
PM callbacks responsible of clock gating.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent 9ae4ed7d

drivers/mmc/host/tmio_mmc.h

+0 −20
Original line number Diff line number Diff line
@@ -40,22 +40,6 @@ 


struct tmio_mmc_data;



/*

 * We differentiate between the following 3 power states:

 * 1. card slot powered off, controller stopped. This is used, when either there

 *    is no card in the slot, or the card really has to be powered down.

 * 2. card slot powered on, controller stopped. This is used, when a card is in

 *    the slot, but no activity is currently taking place. This is a power-

 *    saving mode with card-state preserved. This state can be entered, e.g.

 *    when MMC clock-gating is used.

 * 3. card slot powered on, controller running. This is the actual active state.

 */

enum tmio_mmc_power {

	TMIO_MMC_OFF_STOP,	/* card power off, controller stopped */

	TMIO_MMC_ON_STOP,	/* card power on, controller stopped */

	TMIO_MMC_ON_RUN,	/* card power on, controller running */

};



struct tmio_mmc_host {

	void __iomem *ctl;

	struct mmc_command      *cmd;
@@ -63,9 +47,6 @@ struct tmio_mmc_host { 
	struct mmc_data         *data;

	struct mmc_host         *mmc;



	/* Controller and card power state */

	enum tmio_mmc_power	power;



	/* Callbacks for clock / power control */

	void (*set_pwr)(struct platform_device *host, int state);

	void (*set_clk_div)(struct platform_device *host, int state);
@@ -100,7 +81,6 @@ struct tmio_mmc_host { 
	unsigned long		last_req_ts;

	struct mutex		ios_lock;	/* protect set_ios() context */

	bool			native_hotplug;

	bool			resuming;

	bool			sdio_irq_enabled;

};

drivers/mmc/host/tmio_mmc_pio.c

+14 −47
Original line number Diff line number Diff line
@@ -884,51 +884,23 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 


	spin_unlock_irqrestore(&host->lock, flags);



	/*

	 * host->power toggles between false and true in both cases - either

	 * or not the controller can be runtime-suspended during inactivity.

	 * But if the controller has to be kept on, the runtime-pm usage_count

	 * is kept positive, so no suspending actually takes place.

	 */

	if (ios->power_mode == MMC_POWER_ON && ios->clock) {

		if (host->power != TMIO_MMC_ON_RUN) {

			tmio_mmc_clk_update(mmc);

			if (host->resuming) {

				tmio_mmc_reset(host);

				host->resuming = false;

			}

		}

		if (host->power == TMIO_MMC_OFF_STOP)

			tmio_mmc_reset(host);

	switch (ios->power_mode) {

	case MMC_POWER_OFF:

		tmio_mmc_power_off(host);

		tmio_mmc_clk_stop(host);

		break;

	case MMC_POWER_UP:

		tmio_mmc_set_clock(host, ios->clock);

		if (host->power == TMIO_MMC_OFF_STOP)

			/* power up SD card and the bus */

		tmio_mmc_power_on(host, ios->vdd);

		host->power = TMIO_MMC_ON_RUN;

		/* start bus clock */

		tmio_mmc_clk_start(host);

	} else if (ios->power_mode != MMC_POWER_UP) {

		struct tmio_mmc_data *pdata = host->pdata;

		unsigned int old_power = host->power;



		if (old_power != TMIO_MMC_OFF_STOP) {

			if (ios->power_mode == MMC_POWER_OFF) {

				tmio_mmc_power_off(host);

				host->power = TMIO_MMC_OFF_STOP;

			} else {

				host->power = TMIO_MMC_ON_STOP;

			}

		}



		if (old_power == TMIO_MMC_ON_RUN) {

			tmio_mmc_clk_stop(host);

			if (pdata->clk_disable)

				pdata->clk_disable(host->pdev);

		}

	}



	if (host->power != TMIO_MMC_OFF_STOP)

		tmio_mmc_set_bus_width(host, ios->bus_width);

		break;

	case MMC_POWER_ON:

		tmio_mmc_set_clock(host, ios->clock);

		tmio_mmc_clk_start(host);

		tmio_mmc_set_bus_width(host, ios->bus_width);

		break;

	}



	/* Let things settle. delay taken from winCE driver */

	udelay(140);
@@ -1064,7 +1036,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host, 
				  mmc->caps & MMC_CAP_NONREMOVABLE ||

				  mmc->slot.cd_irq >= 0);



	_host->power = TMIO_MMC_OFF_STOP;

	if (tmio_mmc_clk_update(mmc) < 0) {

		mmc->f_max = pdata->hclk;

		mmc->f_min = mmc->f_max / 512;
@@ -1116,8 +1087,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host, 
	pm_runtime_enable(&pdev->dev);



	ret = mmc_add_host(mmc);

	if (pdata->clk_disable)

		pdata->clk_disable(pdev);

	if (ret < 0) {

		tmio_mmc_host_remove(_host);

		return ret;
@@ -1185,8 +1154,6 @@ int tmio_mmc_host_resume(struct device *dev) 


	tmio_mmc_enable_dma(host, true);



	/* The MMC core will perform the complete set up */

	host->resuming = true;

	return 0;

}

EXPORT_SYMBOL(tmio_mmc_host_resume);