mmc: sdhci-msm: Boost controller core clock

Ensure SDCC is working with maximum clock otherwise card
detection could be extremely slow, up to 7 seconds.
Signed-off-by: NIvan T. Ivanov <ivan.ivanov@linaro.org>
Reviewed-by: NGeorgi Djakov <georgi.djakov@linaro.org>
Acked-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-msm.c

@@ -489,6 +489,11 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 		goto pclk_disable;
 	}
 
+	/* Vote for maximum clock rate for maximum performance */
+	ret = clk_set_rate(msm_host->clk, INT_MAX);
+	if (ret)
+		dev_warn(&pdev->dev, "core clock boost failed\n");
+
 	ret = clk_prepare_enable(msm_host->clk);
 	if (ret)
 		goto pclk_disable;