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mtd: maps: l440gx: Add reference counter to set_vpp()

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This patch is part of a set which fixes unnecessary flash erase and write errors
resulting from the MTD CFI driver turning off vpp while an erase is in progress.
This patch allows l440gx_set_vpp() calls to be nested by adding a reference
counter.

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Paul Parsons 2012-03-07 14:12:50 +00:00 committed by David Woodhouse
parent 876fe76d79
commit 5fbabf3f45
1 changed files with 9 additions and 5 deletions
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14
drivers/mtd/maps/l440gx.c
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@ -27,17 +27,21 @@ static struct mtd_info *mymtd;
/* Is this really the vpp port? */
static DEFINE_SPINLOCK(l440gx_vpp_lock);
static int l440gx_vpp_refcnt;
static void l440gx_set_vpp(struct map_info *map, int vpp)
{
unsigned long l;
unsigned long flags;
l = inl(VPP_PORT);
spin_lock_irqsave(&l440gx_vpp_lock, flags);
if (vpp) {
l |= 1;
if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */
outl(inl(VPP_PORT) | 1, VPP_PORT);
} else {
l &= ~1;
if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */
outl(inl(VPP_PORT) & ~1, VPP_PORT);
}
outl(l, VPP_PORT);
spin_unlock_irqrestore(&l440gx_vpp_lock, flags);
}
static struct map_info l440gx_map = {