From: Juha Yrjölä <juha.yrjola at nokia.com>
Date: Fri, 1 Jul 2005 12:20:56 +0000 (-0700)
Subject: [PATCH] ARM: OMAP: Reduce MMC clock frequency
X-Git-Tag: v2.6.13-omap1~79
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=770e31d3ca8948318c013c34d9f12dac343574a7;p=linux-2.6-omap-h63xx.git

[PATCH] ARM: OMAP: Reduce MMC clock frequency

Reduce the MMC clock frequency slightly to make all cards work.
Otherwise weird CRC errors seem to happen with many RS-MMC
cards.

Signed-off-by: Juha Yrjölä <juha.yrjola at nokia.com>
---

diff --git a/drivers/mmc/omap.c b/drivers/mmc/omap.c
index af7e0aeac2b..7f4c74e0316 100644
--- a/drivers/mmc/omap.c
+++ b/drivers/mmc/omap.c
@@ -845,15 +845,18 @@ static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	if (ios->clock == 0) {
 		dsor = 0;
 	} else {
-		dsor = 48000000 / realclock;
+		int func_clk_rate = clk_get_rate(host->clk);
+
+		dsor = func_clk_rate / realclock;
 		if (dsor < 1)
 			dsor = 1;
 
-		if (48000000 / dsor > realclock)
+		if (func_clk_rate / dsor > realclock)
 			dsor++;
 
 		if (dsor > 250)
 			dsor = 250;
+		dsor++;
 	}
 
 	/* REVISIT:  if (ios->bus_width == MMC_BUS_WIDTH_4) dsor |= 1 << 15; */