driver/mtd/IFC:Wait tWB time, poll R/B before command execution
authorPrabhakar Kushwaha <prabhakar@freescale.com>
Wed, 7 Nov 2012 21:52:27 +0000 (21:52 +0000)
committerScott Wood <scottwood@freescale.com>
Fri, 21 Dec 2012 21:34:54 +0000 (15:34 -0600)
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>
drivers/mtd/nand/fsl_ifc_nand.c

index 0878bec..b13d8a9 100644 (file)
@@ -391,7 +391,7 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
                        timing = IFC_FIR_OP_RBCD;
 
                out_be32(&ifc->ifc_nand.nand_fir0,
                        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,
                                (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
                                (timing << IFC_NAND_FIR0_OP2_SHIFT));
                out_be32(&ifc->ifc_nand.nand_fcr0,
@@ -758,7 +758,7 @@ static void fsl_ifc_sram_init(void)
 
        /* READID */
        out_be32(&ifc->ifc_nand.nand_fir0,
 
        /* 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,
                        (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,