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mtd: Add support for emulated SLC mode on MLC NANDs

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MLC NANDs can be made a bit more reliable if we only program the lower
page of each pair. At least, this solves the paired-pages corruption
issue.

Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200503155341.16712-5-miquel.raynal@bootlin.com
This commit is contained in:
Boris Brezillon
2020-05-03 17:53:37 +02:00
committed by Miquel Raynal
parent d652f3a5bd
commit 9e3307a169
5 changed files with 213 additions and 40 deletions
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54
drivers/mtd/mtdpart.c
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@@ -35,9 +35,12 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
const struct mtd_partition *part,
int partno, uint64_t cur_offset)
{
int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize :
parent->erasesize;
struct mtd_info *child, *master = mtd_get_master(parent);
struct mtd_info *master = mtd_get_master(parent);
int wr_alignment = (parent->flags & MTD_NO_ERASE) ?
master->writesize : master->erasesize;
u64 parent_size = mtd_is_partition(parent) ?
parent->part.size : parent->size;
struct mtd_info *child;
u32 remainder;
char *name;
u64 tmp;
@@ -56,8 +59,9 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
/* set up the MTD object for this partition */
child->type = parent->type;
child->part.flags = parent->flags & ~part->mask_flags;
child->part.flags |= part->add_flags;
child->flags = child->part.flags;
child->size = part->size;
child->part.size = part->size;
child->writesize = parent->writesize;
child->writebufsize = parent->writebufsize;
child->oobsize = parent->oobsize;
@@ -98,29 +102,29 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
}
if (child->part.offset == MTDPART_OFS_RETAIN) {
child->part.offset = cur_offset;
if (parent->size - child->part.offset >= child->size) {
child->size = parent->size - child->part.offset -
child->size;
if (parent_size - child->part.offset >= child->part.size) {
child->part.size = parent_size - child->part.offset -
child->part.size;
} else {
printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
part->name, parent->size - child->part.offset,
child->size);
part->name, parent_size - child->part.offset,
child->part.size);
/* register to preserve ordering */
goto out_register;
}
}
if (child->size == MTDPART_SIZ_FULL)
child->size = parent->size - child->part.offset;
if (child->part.size == MTDPART_SIZ_FULL)
child->part.size = parent_size - child->part.offset;
printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n",
child->part.offset, child->part.offset + child->size,
child->part.offset, child->part.offset + child->part.size,
child->name);
/* let's do some sanity checks */
if (child->part.offset >= parent->size) {
if (child->part.offset >= parent_size) {
/* let's register it anyway to preserve ordering */
child->part.offset = 0;
child->size = 0;
child->part.size = 0;
/* Initialize ->erasesize to make add_mtd_device() happy. */
child->erasesize = parent->erasesize;
@@ -128,15 +132,16 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
part->name);
goto out_register;
}
if (child->part.offset + child->size > parent->size) {
child->size = parent->size - child->part.offset;
if (child->part.offset + child->part.size > parent->size) {
child->part.size = parent_size - child->part.offset;
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
part->name, parent->name, child->size);
part->name, parent->name, child->part.size);
}
if (parent->numeraseregions > 1) {
/* Deal with variable erase size stuff */
int i, max = parent->numeraseregions;
u64 end = child->part.offset + child->size;
u64 end = child->part.offset + child->part.size;
struct mtd_erase_region_info *regions = parent->eraseregions;
/* Find the first erase regions which is part of this
@@ -156,7 +161,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
BUG_ON(child->erasesize == 0);
} else {
/* Single erase size */
child->erasesize = parent->erasesize;
child->erasesize = master->erasesize;
}
/*
@@ -178,7 +183,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
part->name);
}
tmp = mtd_get_master_ofs(child, 0) + child->size;
tmp = mtd_get_master_ofs(child, 0) + child->part.size;
remainder = do_div(tmp, wr_alignment);
if ((child->flags & MTD_WRITEABLE) && remainder) {
child->flags &= ~MTD_WRITEABLE;
@@ -186,6 +191,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
part->name);
}
child->size = child->part.size;
child->ecc_step_size = parent->ecc_step_size;
child->ecc_strength = parent->ecc_strength;
child->bitflip_threshold = parent->bitflip_threshold;
@@ -193,7 +199,7 @@ static struct mtd_info *allocate_partition(struct mtd_info *parent,
if (master->_block_isbad) {
uint64_t offs = 0;
while (offs < child->size) {
while (offs < child->part.size) {
if (mtd_block_isreserved(child, offs))
child->ecc_stats.bbtblocks++;
else if (mtd_block_isbad(child, offs))
@@ -234,6 +240,8 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
long long offset, long long length)
{
struct mtd_info *master = mtd_get_master(parent);
u64 parent_size = mtd_is_partition(parent) ?
parent->part.size : parent->size;
struct mtd_partition part;
struct mtd_info *child;
int ret = 0;
@@ -244,7 +252,7 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
return -EINVAL;
if (length == MTDPART_SIZ_FULL)
length = parent->size - offset;
length = parent_size - offset;
if (length <= 0)
return -EINVAL;
@@ -419,7 +427,7 @@ int add_mtd_partitions(struct mtd_info *parent,
/* Look for subpartitions */
parse_mtd_partitions(child, parts[i].types, NULL);
cur_offset = child->part.offset + child->size;
cur_offset = child->part.offset + child->part.size;
}
return 0;