If nand_scan_ident fail try to reconfigure buswidth from 8bit to 16bit or
the other way around.
There are still the ugly debug messages like:
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xb3 (Micron NAND 1GiB 1,8V 16-bit)
NAND bus width 8 instead 16 bit
No NAND device found (-22)!
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xb3 (Micron NAND 1GiB 1,8V 16-bit)
Signed-off-by: Jan Weitzel <j.weitzel@xxxxxxxxx>
---
drivers/mtd/nand/nand_omap_gpmc.c | 30 ++++++++++++++++++++++++++++--
1 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/nand_omap_gpmc.c b/drivers/mtd/nand/nand_omap_gpmc.c
index d55dcaa..b80ac14 100644
--- a/drivers/mtd/nand/nand_omap_gpmc.c
+++ b/drivers/mtd/nand/nand_omap_gpmc.c
@@ -803,6 +803,27 @@ static int omap_gpmc_eccmode_set(struct device_d *dev, struct param_d *param, co
return omap_gpmc_eccmode(oinfo, i);
}
+void gpmc_reconfigure_buswidth(struct gpmc_nand_info *oinfo)
+{
+ struct nand_chip *nand = &oinfo->nand;
+ struct gpmc_config cfg;
+
+ gpmc_get_config(oinfo->gpmc_cs, &cfg);
+
+ if (nand->options & NAND_BUSWIDTH_16) {
+ cfg.cfg[0] = GPMC_CONFIG1_DEVICETYPE_NAND;
+ nand->options ^= NAND_BUSWIDTH_16;
+ } else {
+ cfg.cfg[0] = GPMC_CONFIG1_DEVICETYPE_NAND |
+ GPMC_CONFIG1_DEVICESIZE_16;
+ nand->options |= NAND_BUSWIDTH_16;
+ }
+ debug("reconfigure buswidth to %d bit\n",
+ (nand->options & NAND_BUSWIDTH_16) ? 16 : 8);
+
+ gpmc_cs_config(oinfo->gpmc_cs, &cfg);
+}
+
/**
* @brief nand device probe.
*
@@ -924,8 +945,13 @@ static int gpmc_nand_probe(struct device_d *pdev)
/* first scan to find the device and get the page size */
if (nand_scan_ident(minfo, 1)) {
- err = -ENXIO;
- goto out_release_mem;
+ /* retry with changed buswidth*/
+ gpmc_reconfigure_buswidth(oinfo);
+
+ if (nand_scan_ident(minfo, 1)) {
+ err = -ENXIO;
+ goto out_release_mem;
+ }
}
switch (pdata->device_width) {
--
1.7.0.4
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