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From 2e9349e8be6002955cb0ab6a6ed536f5f8041cba Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Fri, 25 Jul 2008 23:06:21 +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 505be5f..0d82955 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);
--
1.5.6.3
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