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: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sh_mmcif.c

@@ -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);
 }