openwrtv4/target/linux/s3c24xx/patches-2.6.24/1247-fix-glamo-mci-ensure-more-than-74-clocks-after-power.patch

From 8533927964761f4e2078ccd8607b90f5acc60b93 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Thu, 24 Jul 2008 00:04:54 +0100
Subject: [PATCH] fix-glamo-mci-ensure-more-than-74-clocks-after-power.patch

We are meant to run SD_CLK a little while after power-on for the SD
Card, but with the no idle clock changes we didn't take care about it.

This makes us sleep a little bit before disabling clock if we just
powered up the SD Card.

Signed-off-by: Andy Green <andy@openmoko.com>
---
 drivers/mfd/glamo/glamo-mci.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
index 264a6bc..c2351e2 100644
--- a/drivers/mfd/glamo/glamo-mci.c
+++ b/drivers/mfd/glamo/glamo-mci.c
@@ -684,6 +684,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	struct glamo_mci_host *host = mmc_priv(mmc);
 	int n = 0;
 	int div;
+	int powering = 0;
 
 	/* Set power */
 	switch(ios->power_mode) {
@@ -699,6 +700,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		glamo_engine_enable(glamo_mci_def_pdata.pglamo,
 							GLAMO_ENGINE_MMC);
 		glamo_mci_reset(host);
+		powering = 1;
 		break;
 
 	case MMC_POWER_OFF:
@@ -716,6 +718,12 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	host->real_rate = __glamo_mci_set_card_clock(host, ios->clock, &div);
 	host->clk_div = div;
 
+	/* after power-up, we are meant to give it >= 74 clocks so it can
+	 * initialize itself.  Doubt any modern cards need it but anyway...
+	 */
+	if (powering)
+		msleep(1);
+
 	if (!sd_idleclk)
 		/* stop the clock to card, because we are idle until transfer */
 		__glamo_mci_fix_card_div(host, -1);
-- 
1.5.6.5