mtd: maps: l440gx: Add reference counter to set_vpp()
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>
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@ -27,17 +27,21 @@ static struct mtd_info *mymtd;
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/* Is this really the vpp port? */
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static DEFINE_SPINLOCK(l440gx_vpp_lock);
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static int l440gx_vpp_refcnt;
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static void l440gx_set_vpp(struct map_info *map, int vpp)
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{
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unsigned long l;
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unsigned long flags;
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l = inl(VPP_PORT);
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spin_lock_irqsave(&l440gx_vpp_lock, flags);
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if (vpp) {
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l |= 1;
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if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */
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outl(inl(VPP_PORT) | 1, VPP_PORT);
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} else {
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l &= ~1;
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if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */
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outl(inl(VPP_PORT) & ~1, VPP_PORT);
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}
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outl(l, VPP_PORT);
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spin_unlock_irqrestore(&l440gx_vpp_lock, flags);
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}
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static struct map_info l440gx_map = {
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