[PATCH 4/5] drivers: mtd: onenand: add workaround for SYNC_WRITE mode
Marek Szyprowski
m.szyprowski at samsung.com
Wed Apr 28 11:46:48 EDT 2010
From: Kyungmin Park <kyungmin.park at samsung.com>
Some chips fails to identify properly when SYNC_WRITE mode is enabled
(the example is OneNAND on S5PC110 SoC). This patch adds a workaround
for such chips.
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
drivers/mtd/onenand/onenand_base.c | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 9827ab7..26caf25 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -3763,6 +3763,12 @@ static int onenand_probe(struct mtd_info *mtd)
/* Restore system configuration 1 */
this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
+ /* Workaround */
+ if (syscfg & ONENAND_SYS_CFG1_SYNC_WRITE) {
+ bram_maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
+ bram_dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
+ }
+
/* Check manufacturer ID */
if (onenand_check_maf(bram_maf_id))
return -ENXIO;
@@ -3782,6 +3788,9 @@ static int onenand_probe(struct mtd_info *mtd)
this->device_id = dev_id;
this->version_id = ver_id;
+ /* Check OneNAND features */
+ onenand_check_features(mtd);
+
density = onenand_get_density(dev_id);
if (FLEXONENAND(this)) {
this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
@@ -3833,9 +3842,6 @@ static int onenand_probe(struct mtd_info *mtd)
else
mtd->size = this->chipsize;
- /* Check OneNAND features */
- onenand_check_features(mtd);
-
/*
* We emulate the 4KiB page and 256KiB erase block size
* But oobsize is still 64 bytes.
--
1.6.4
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