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[PATCH] MMC: wbsd delayed insertion 

Wait 0.5 seconds before scanning for cards after an insertion interrupt.
The electrical connection needs this time to stabilise for some cards.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pierre Ossman 2005-07-01 12:13:55 +01:00 committed by Russell King
parent 7b09cdac5a
commit 6e6293dd3d
2 changed files with 43 additions and 10 deletions
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51
drivers/mmc/wbsd.c
View File

@ -1050,6 +1050,20 @@ static struct mmc_host_ops wbsd_ops = {
* *
\*****************************************************************************/
/*
* Helper function for card detection
*/
static void wbsd_detect_card(unsigned long data)
{
struct wbsd_host *host = (struct wbsd_host*)data;
BUG_ON(host == NULL);
DBG("Executing card detection\n");
mmc_detect_change(host->mmc);
}
/*
* Tasklets
*/
@ -1075,7 +1089,6 @@ static void wbsd_tasklet_card(unsigned long param)
{
struct wbsd_host* host = (struct wbsd_host*)param;
u8 csr;
int change = 0;
spin_lock(&host->lock);
@ -1094,14 +1107,20 @@ static void wbsd_tasklet_card(unsigned long param)
{
DBG("Card inserted\n");
host->flags |= WBSD_FCARD_PRESENT;
change = 1;
/*
* Delay card detection to allow electrical connections
* to stabilise.
*/
mod_timer(&host->timer, jiffies + HZ/2);
}
spin_unlock(&host->lock);
}
else if (host->flags & WBSD_FCARD_PRESENT)
{
DBG("Card removed\n");
host->flags &= ~WBSD_FCARD_PRESENT;
change = 1;
if (host->mrq)
{
@ -1112,15 +1131,14 @@ static void wbsd_tasklet_card(unsigned long param)
host->mrq->cmd->error = MMC_ERR_FAILED;
tasklet_schedule(&host->finish_tasklet);
}
}
/*
* Unlock first since we might get a call back.
*/
spin_unlock(&host->lock);
/*
* Unlock first since we might get a call back.
*/
spin_unlock(&host->lock);
if (change)
mmc_detect_change(host->mmc);
}
}
static void wbsd_tasklet_fifo(unsigned long param)
@ -1324,6 +1342,13 @@ static int __devinit wbsd_alloc_mmc(struct device* dev)
spin_lock_init(&host->lock);
/*
* Set up detection timer
*/
init_timer(&host->timer);
host->timer.data = (unsigned long)host;
host->timer.function = wbsd_detect_card;
/*
* Maximum number of segments. Worst case is one sector per segment
* so this will be 64kB/512.
@ -1351,11 +1376,17 @@ static int __devinit wbsd_alloc_mmc(struct device* dev)
static void __devexit wbsd_free_mmc(struct device* dev)
{
struct mmc_host* mmc;
struct wbsd_host* host;
mmc = dev_get_drvdata(dev);
if (!mmc)
return;
host = mmc_priv(mmc);
BUG_ON(host == NULL);
del_timer_sync(&host->timer);
mmc_free_host(mmc);
dev_set_drvdata(dev, NULL);

2
drivers/mmc/wbsd.h
View File

@ -187,4 +187,6 @@ struct wbsd_host
struct tasklet_struct timeout_tasklet;
struct tasklet_struct finish_tasklet;
struct tasklet_struct block_tasklet;
struct timer_list timer; /* Card detection timer */
};