>From e543f7849ab668fa0cbabc048e37e090e7b6f167 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Thu, 12 Mar 2009 17:08:26 +0200
Subject: [PATCH] OMAP: HSMMC: Wait for SDBP
It is necessary to wait for bus power before sending
any commands.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/mmc/host/omap_hsmmc.c | 20 +++++++++++++++-----
1 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 91381f4..2f444c8 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -546,6 +546,19 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static void set_sd_bus_power(struct mmc_omap_host *host)
+{
+ unsigned long i;
+
+ OMAP_HSMMC_WRITE(host->base, HCTL,
+ OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
+ for (i = 0; i < loops_per_jiffy; i++) {
+ if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
+ break;
+ cpu_relax();
+ }
+}
+
/*
* Switch MMC interface voltage ... only relevant for MMC1.
*
@@ -602,9 +615,7 @@ static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
reg_val |= SDVS30;
OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
-
- OMAP_HSMMC_WRITE(host->base, HCTL,
- OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
+ set_sd_bus_power(host);
return 0;
err:
@@ -997,8 +1008,7 @@ static void omap_hsmmc_init(struct mmc_omap_host *host)
OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
/* Set SD bus power bit */
- value = OMAP_HSMMC_READ(host->base, HCTL);
- OMAP_HSMMC_WRITE(host->base, HCTL, value | SDBP);
+ set_sd_bus_power(host);
}
static struct mmc_host_ops mmc_omap_ops = {
--
1.5.6.3
--
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