Commit b289174f authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Chris Ball
Browse files

mmc: sh_mmcif: fix clock management 



Regardless of whether the MMC bus clock is the same as the PM clock on
this specific interface, it has to be managed separately. Its proper
management should also include enabling and disabling of the clock,
whenever the interface is becoming active or going idle respectively.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Reviewed-by: default avatarSimon Horman <horms@verge.net.au>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent e1aae2eb

drivers/mmc/host/sh_mmcif.c

+23 −23
Original line number Diff line number Diff line
@@ -942,6 +942,7 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 
		}

		if (host->power) {

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

			clk_disable(host->hclk);

			host->power = false;

			if (p->down_pwr && ios->power_mode == MMC_POWER_OFF)

				p->down_pwr(host->pd);
@@ -954,6 +955,7 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 
		if (!host->power) {

			if (p->set_pwr)

				p->set_pwr(host->pd, ios->power_mode);

			clk_enable(host->hclk);

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

			host->power = true;

			sh_mmcif_sync_reset(host);
@@ -1278,22 +1280,11 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev) 
	host->addr	= reg;

	host->timeout	= 1000;



	snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);

	host->hclk = clk_get(&pdev->dev, clk_name);

	if (IS_ERR(host->hclk)) {

		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);

		ret = PTR_ERR(host->hclk);

		goto eclkget;

	}

	clk_enable(host->hclk);

	host->clk = clk_get_rate(host->hclk);

	host->pd = pdev;



	spin_lock_init(&host->lock);



	mmc->ops = &sh_mmcif_ops;

	mmc->f_max = host->clk / 2;

	mmc->f_min = host->clk / 512;

	if (pd->ocr)

		mmc->ocr_avail = pd->ocr;

	mmc->caps = MMC_CAP_MMC_HIGHSPEED;
@@ -1305,18 +1296,30 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev) 
	mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;

	mmc->max_seg_size = mmc->max_req_size;



	sh_mmcif_sync_reset(host);

	platform_set_drvdata(pdev, host);



	pm_runtime_enable(&pdev->dev);

	host->power = false;



	snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);

	host->hclk = clk_get(&pdev->dev, clk_name);

	if (IS_ERR(host->hclk)) {

		ret = PTR_ERR(host->hclk);

		dev_err(&pdev->dev, "cannot get clock \"%s\": %d\n", clk_name, ret);

		goto eclkget;

	}

	clk_enable(host->hclk);

	host->clk = clk_get_rate(host->hclk);

	mmc->f_max = host->clk / 2;

	mmc->f_min = host->clk / 512;



	ret = pm_runtime_resume(&pdev->dev);

	if (ret < 0)

		goto eresume;



	INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);



	sh_mmcif_sync_reset(host);

	sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);



	ret = request_threaded_irq(irq[0], sh_mmcif_intr, sh_mmcif_irqt, 0, "sh_mmc:error", host);
@@ -1330,6 +1333,7 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev) 
		goto ereqirq1;

	}



	clk_disable(host->hclk);

	ret = mmc_add_host(mmc);

	if (ret < 0)

		goto emmcaddh;
@@ -1348,9 +1352,10 @@ ereqirq1: 
ereqirq0:

	pm_runtime_suspend(&pdev->dev);

eresume:

	pm_runtime_disable(&pdev->dev);

	clk_disable(host->hclk);

	clk_put(host->hclk);

eclkget:

	pm_runtime_disable(&pdev->dev);

	mmc_free_host(mmc);

ealloch:

	iounmap(reg);
@@ -1363,6 +1368,7 @@ static int __devexit sh_mmcif_remove(struct platform_device *pdev) 
	int irq[2];



	host->dying = true;

	clk_enable(host->hclk);

	pm_runtime_get_sync(&pdev->dev);



	dev_pm_qos_hide_latency_limit(&pdev->dev);
@@ -1388,9 +1394,9 @@ static int __devexit sh_mmcif_remove(struct platform_device *pdev) 


	platform_set_drvdata(pdev, NULL);



	clk_disable(host->hclk);

	mmc_free_host(host->mmc);

	pm_runtime_put_sync(&pdev->dev);

	clk_disable(host->hclk);

	pm_runtime_disable(&pdev->dev);



	return 0;
@@ -1399,24 +1405,18 @@ static int __devexit sh_mmcif_remove(struct platform_device *pdev) 
#ifdef CONFIG_PM

static int sh_mmcif_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct sh_mmcif_host *host = platform_get_drvdata(pdev);

	struct sh_mmcif_host *host = dev_get_drvdata(dev);

	int ret = mmc_suspend_host(host->mmc);



	if (!ret) {

	if (!ret)

		sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);

		clk_disable(host->hclk);

	}



	return ret;

}



static int sh_mmcif_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct sh_mmcif_host *host = platform_get_drvdata(pdev);



	clk_enable(host->hclk);

	struct sh_mmcif_host *host = dev_get_drvdata(dev);



	return mmc_resume_host(host->mmc);

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE