linux-kernel - [PATCH 05/41] mmc: host: omap_hsmmc: Set clk rate to the max frequency

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Date:   Fri, 19 May 2017 13:45:05 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Jonathan Corbet <corbet@....net>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>, <nsekhar@...com>,
        <kishon@...com>
Subject: [PATCH 05/41] mmc: host: omap_hsmmc: Set clk rate to the max frequency

Set the clock rate of the functional clock to the max frequency
that is passed to the driver either using pdata or dt.

Also remove unnecessary setting of host->fclk to NULL.

This is in preparation for supporting high frequency modes
of operation.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 drivers/mmc/host/omap_hsmmc.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 4dbf75ad2376..77be27c8e18c 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -2244,22 +2244,29 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	mmc->ops	= &omap_hsmmc_ops;
 
-	mmc->f_min = OMAP_MMC_MIN_CLOCK;
-
-	if (pdata->max_freq > 0)
-		mmc->f_max = pdata->max_freq;
-	else if (mmc->f_max == 0)
-		mmc->f_max = OMAP_MMC_MAX_CLOCK;
-
 	spin_lock_init(&host->irq_lock);
 
 	host->fclk = devm_clk_get(&pdev->dev, "fck");
 	if (IS_ERR(host->fclk)) {
 		ret = PTR_ERR(host->fclk);
-		host->fclk = NULL;
 		goto err1;
 	}
 
+	mmc->f_min = OMAP_MMC_MIN_CLOCK;
+	if (pdata->max_freq > 0)
+		mmc->f_max = pdata->max_freq;
+
+	if (mmc->f_max) {
+		ret = clk_set_rate(host->fclk, mmc->f_max);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to set clock to %d\n",
+				mmc->f_max);
+			goto err1;
+		}
+	} else {
+		mmc->f_max = OMAP_MMC_MAX_CLOCK;
+	}
+
 	if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
 		dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
 		omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk;
-- 
2.11.0