Commit 1ff44433 authored by Ulf Hansson's avatar Ulf Hansson Committed by Russell King
Browse files

ARM: 7834/1: mmc: mmci: Save and restore register context 



If a corresponding power domain exists for the device and it manages
to cut the domain regulator while the device is runtime suspended,
the IP loses it's registers context. We restore the context in the
.runtime_resume callback from the existing register caches to adapt
to this situation.

We also want to make sure the registers are in a known state while
restoring context in the case when the power domain did not drop the
power, since there are restrictions for the order of writing to these
registers. To handle this, we clear the registers in the
.runtime_suspend callback.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarRickard Andersson <rickard.andersson@stericsson.com>
Reviewed-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f829c042

drivers/mmc/host/mmci.c

+43 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ static unsigned int fmax = 515633; 
 * @signal_direction: input/out direction of bus signals can be indicated

 * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock

 * @busy_detect: true if busy detection on dat0 is supported

 * @pwrreg_nopower: bits in MMCIPOWER don't controls ext. power supply

 */

struct variant_data {

	unsigned int		clkreg;
@@ -76,6 +77,7 @@ struct variant_data { 
	bool			signal_direction;

	bool			pwrreg_clkgate;

	bool			busy_detect;

	bool			pwrreg_nopower;

};



static struct variant_data variant_arm = {
@@ -109,6 +111,7 @@ static struct variant_data variant_u300 = { 
	.pwrreg_powerup		= MCI_PWR_ON,

	.signal_direction	= true,

	.pwrreg_clkgate		= true,

	.pwrreg_nopower		= true,

};



static struct variant_data variant_nomadik = {
@@ -121,6 +124,7 @@ static struct variant_data variant_nomadik = { 
	.pwrreg_powerup		= MCI_PWR_ON,

	.signal_direction	= true,

	.pwrreg_clkgate		= true,

	.pwrreg_nopower		= true,

};



static struct variant_data variant_ux500 = {
@@ -135,6 +139,7 @@ static struct variant_data variant_ux500 = { 
	.signal_direction	= true,

	.pwrreg_clkgate		= true,

	.busy_detect		= true,

	.pwrreg_nopower		= true,

};



static struct variant_data variant_ux500v2 = {
@@ -150,6 +155,7 @@ static struct variant_data variant_ux500v2 = { 
	.signal_direction	= true,

	.pwrreg_clkgate		= true,

	.busy_detect		= true,

	.pwrreg_nopower		= true,

};



static int mmci_card_busy(struct mmc_host *mmc)
@@ -1759,6 +1765,41 @@ static int mmci_resume(struct device *dev) 
#endif



#ifdef CONFIG_PM_RUNTIME

static void mmci_save(struct mmci_host *host)

{

	unsigned long flags;



	if (host->variant->pwrreg_nopower) {

		spin_lock_irqsave(&host->lock, flags);



		writel(0, host->base + MMCIMASK0);

		writel(0, host->base + MMCIDATACTRL);

		writel(0, host->base + MMCIPOWER);

		writel(0, host->base + MMCICLOCK);

		mmci_reg_delay(host);



		spin_unlock_irqrestore(&host->lock, flags);

	}



}



static void mmci_restore(struct mmci_host *host)

{

	unsigned long flags;



	if (host->variant->pwrreg_nopower) {

		spin_lock_irqsave(&host->lock, flags);



		writel(host->clk_reg, host->base + MMCICLOCK);

		writel(host->datactrl_reg, host->base + MMCIDATACTRL);

		writel(host->pwr_reg, host->base + MMCIPOWER);

		writel(MCI_IRQENABLE, host->base + MMCIMASK0);

		mmci_reg_delay(host);



		spin_unlock_irqrestore(&host->lock, flags);

	}

}



static int mmci_runtime_suspend(struct device *dev)

{

	struct amba_device *adev = to_amba_device(dev);
@@ -1767,6 +1808,7 @@ static int mmci_runtime_suspend(struct device *dev) 
	if (mmc) {

		struct mmci_host *host = mmc_priv(mmc);

		pinctrl_pm_select_sleep_state(dev);

		mmci_save(host);

		clk_disable_unprepare(host->clk);

	}
@@ -1781,6 +1823,7 @@ static int mmci_runtime_resume(struct device *dev) 
	if (mmc) {

		struct mmci_host *host = mmc_priv(mmc);

		clk_prepare_enable(host->clk);

		mmci_restore(host);

		pinctrl_pm_select_default_state(dev);

	}

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