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[v2,05/11] mmc: host: omap_hsmmc: set clk rate to the max frequency

Message ID 1440493542-26150-6-git-send-email-kishon@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Kishon Vijay Abraham I Aug. 25, 2015, 9:05 a.m. UTC 
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@ti.com>
---
 drivers/mmc/host/omap_hsmmc.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
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Patch

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;