mtd: fsl_ifc_nand: wait tWB time, poll R/B before command execution

IFC_FIR_OP_CMD0 issues command for execution without checking flash
readiness. It may cause problem if flash is not ready. Instead use
IFC_FIR_OP_CW0 which Wait for tWB time and poll R/B to return high or
time-out, before issuing command.

NAND_CMD_READID command implemention does not fulfill above requirement. So
update its programming.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Hemant Nautiyal <hemant.nautiyal@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 3551a99..5315231 100644 (file)
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -389,7 +389,7 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
                        timing = IFC_FIR_OP_RBCD;
 
                out_be32(&ifc->ifc_nand.nand_fir0,
-                               (IFC_FIR_OP_CMD0 << IFC_NAND_FIR0_OP0_SHIFT) |
+                               (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
                                (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
                                (timing << IFC_NAND_FIR0_OP2_SHIFT));
                out_be32(&ifc->ifc_nand.nand_fcr0,
@@ -754,7 +754,7 @@ static void fsl_ifc_sram_init(struct fsl_ifc_mtd *priv)
 
        /* READID */
        out_be32(&ifc->ifc_nand.nand_fir0,
-                       (IFC_FIR_OP_CMD0 << IFC_NAND_FIR0_OP0_SHIFT) |
+                       (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
                        (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
                        (IFC_FIR_OP_RB << IFC_NAND_FIR0_OP2_SHIFT));
        out_be32(&ifc->ifc_nand.nand_fcr0,