mtd: onenand: add workaround for SYNC_WRITE mode

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@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 9827ab779c08..26caf2590dae 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.