[RFC PATCH 2/7] mmc: sh_mobile_sdhi: Add actual clock rate support

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From: Shinobu Uehara <shinobu.uehara.xc@xxxxxxxxxxx>

It is necessary to stop the SD clock before using
the actual clock in case of SDHI controller.

Signed-off-by: Shinobu Uehara <shinobu.uehara.xc@xxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
---
 drivers/mmc/host/sh_mobile_sdhi.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index 6906a905cd54..92a58c6007fe 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -136,6 +136,18 @@ static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
 	clk_disable_unprepare(priv->clk);
 }
 
+static void sh_mobile_sdhi_set_clk_div(struct platform_device *pdev, int clk)
+{
+	struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+
+	if (clk == true) {
+		sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
+				sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+		sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x00ff);
+	}
+}
+
 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
 {
 	int timeout = 1000;
@@ -234,6 +246,8 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
 		goto eprobe;
 	}
 
+	host->set_clk_div	= sh_mobile_sdhi_set_clk_div;
+
 	host->dma		= dma_priv;
 	host->write16_hook	= sh_mobile_sdhi_write16_hook;
 	host->clk_enable	= sh_mobile_sdhi_clk_enable;
-- 
1.7.10.4




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