linux-kernel - [PATCH] mmc: sdhci: msm: Boost controller core clock

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Date:	Fri, 26 Jun 2015 14:16:57 +0300
From:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Georgi Djakov <georgi.djakov@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: [PATCH] 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: Ivan T. Ivanov <ivan.ivanov@...aro.org>
---
 drivers/mmc/host/sdhci-msm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 4a09f76..b2556bc 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/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 falied\n");
+
 	ret = clk_prepare_enable(msm_host->clk);
 	if (ret)
 		goto pclk_disable;
--
1.9.1

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