From: Minkyu Kang <mk7.kang@samsung.com>
Date: Thu, 2 Dec 2010 03:05:08 +0000 (+0900)
Subject: s5p: mmc: allow for eMMC 74 clock generation
X-Git-Tag: v0.2~211
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0f68b80a16fccdea1c1f13b5cbb51f696831cdab;p=kernel%2Fu-boot.git

s5p: mmc: allow for eMMC 74 clock generation

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
---

diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
index 3ec28a4..4964325 100644
--- a/drivers/mmc/s5p_mmc.c
+++ b/drivers/mmc/s5p_mmc.c
@@ -420,9 +420,16 @@ static void mmc_set_ios(struct mmc *mmc)
 
 	writel(val, &host->reg->control3);
 
-
 	mmc_change_clock(host, mmc->clock);
 
+	/*
+	 * eMMC spec calls for the host to send 74 clocks to the card
+	 * during initialization, right after voltage stabilization.
+	 * create the clocks manually right here.
+	 */
+	if (mmc->clock)
+		udelay(74 * 1000000 / mmc->clock);
+
 	ctrl = readb(&host->reg->hostctl);
 
 	/*