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authorYork Sun <yorksun@freescale.com>2012-10-08 07:44:26 +0000
committerAndy Fleming <afleming@freescale.com>2012-10-22 14:31:29 -0500
commita1d558a20f1eaeae9927abc4e0978725d33bae53 (patch)
tree3af577ebb7be24efd3c23d7a8559512d2f9bfa70 /arch/powerpc/cpu
parenteb5394120643922626f18e5fe7b0b3dc0ed43b9a (diff)
powerpc/mpc85xx: Add workaround for DDR erratum A004934
After DDR controller is enabled, it performs a calibration for the transmit data vs DQS paths. During this calibration, the DDR controller may make an inaccurate calculation, resulting in a non-optimal tap point. Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Andy Fleming <afleming@freescale.com>
Diffstat (limited to 'arch/powerpc/cpu')
-rw-r--r--arch/powerpc/cpu/mpc85xx/cmd_errata.c3
-rw-r--r--arch/powerpc/cpu/mpc85xx/ddr-gen3.c3
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index ce5924bc1..2be192d57 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -134,6 +134,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#ifdef CONFIG_SYS_FSL_ERRATUM_SRIO_A004034
puts("Work-around for Erratum SRIO-A004034 enabled\n");
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A_004934
+ puts("Work-around for Erratum A004934 enabled\n");
+#endif
return 0;
}
diff --git a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
index 8bed5fe92..21840bfc2 100644
--- a/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
+++ b/arch/powerpc/cpu/mpc85xx/ddr-gen3.c
@@ -140,6 +140,9 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
out_be32(&ddr->debug[i], regs->debug[i]);
}
}
+#ifdef CONFIG_SYS_FSL_ERRATUM_A_004934
+ out_be32(&ddr->debug[28], 0x00003000);
+#endif
#ifdef CONFIG_SYS_FSL_ERRATUM_DDR_A003474
out_be32(&ddr->debug[12], 0x00000015);