[PATCH 2/4] mmc: sdhci-esdhc-imx: obtain the 'per' clock rate after its enablement

[Ciprian Costea]

The I.MX SDHCI driver assumes that the frequency of the 'per' clock
can be obtained even on disabled clocks, which is not always the case.

According to 'clk_get_rate' documentation, it is only valid
once the clock source has been enabled.

Signed-off-by: Ciprian Costea <ciprianmarian.costea at oss.nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 21d984a77be8..8f0bc6dca2b0 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1709,7 +1709,6 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 	}
 
 	pltfm_host->clk = imx_data->clk_per;
-	pltfm_host->clock = clk_get_rate(pltfm_host->clk);
 	err = clk_prepare_enable(imx_data->clk_per);
 	if (err)
 		goto free_sdhci;
@@ -1720,6 +1719,13 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 	if (err)
 		goto disable_ipg_clk;
 
+	pltfm_host->clock = clk_get_rate(pltfm_host->clk);
+	if (!pltfm_host->clock) {
+		dev_err(mmc_dev(host->mmc), "could not get clk rate\n");
+		err = -EINVAL;
+		goto disable_ahb_clk;
+	}
+
 	imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
 	if (IS_ERR(imx_data->pinctrl))
 		dev_warn(mmc_dev(host->mmc), "could not get pinctrl\n");
-- 
2.45.2