linux-kernel - [PATCH v2 05/11] mmc: host: omap_hsmmc: set clk rate to the max frequency

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Date:	Tue, 25 Aug 2015 14:35:36 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<ulf.hansson@...aro.org>, <afenkart@...il.com>, <tony@...mide.com>,
	<linux-mmc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <nsekhar@...com>
CC:	<neilb@...e.de>, <kishon@...com>
Subject: [PATCH v2 05/11] 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.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/mmc/host/omap_hsmmc.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 7dac486..60c1ac2 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -2149,6 +2149,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	struct omap_hsmmc_host *host = NULL;
 	struct resource *res;
 	int ret, irq;
+	unsigned int freq;
 	const struct of_device_id *match;
 	dma_cap_mask_t mask;
 	unsigned tx_req, rx_req;
@@ -2229,10 +2230,20 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	host->fclk = devm_clk_get(&pdev->dev, "fck");
 	if (IS_ERR(host->fclk)) {
 		ret = PTR_ERR(host->fclk);
-		host->fclk = NULL;
 		goto err1;
 	}
 
+	freq = clk_get_rate(host->fclk);
+	if (freq > mmc->f_max) {
+		mmc->f_max = freq;
+	} else {
+		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;
+		}
+	}
+
 	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;
-- 
1.7.9.5

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