From a1d558a20f1eaeae9927abc4e0978725d33bae53 Mon Sep 17 00:00:00 2001 From: York Sun Date: Mon, 8 Oct 2012 07:44:26 +0000 Subject: [PATCH] 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 Signed-off-by: Andy Fleming --- arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 +++ arch/powerpc/cpu/mpc85xx/ddr-gen3.c | 3 +++ arch/powerpc/include/asm/config_mpc85xx.h | 1 + 3 files changed, 7 insertions(+) diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c index ce5924bc13..2be192d578 100644 --- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c +++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c @@ -133,6 +133,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) #endif #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 8bed5fe925..21840bfc2a 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); diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h index ecb156619d..92ca2ad74d 100644 --- a/arch/powerpc/include/asm/config_mpc85xx.h +++ b/arch/powerpc/include/asm/config_mpc85xx.h @@ -512,6 +512,7 @@ #define CONFIG_SYS_FSL_USB2_PHY_ENABLE #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY #define CONFIG_SYS_FSL_ERRATUM_A004468 +#define CONFIG_SYS_FSL_ERRATUM_A_004934 #define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000 #elif defined(CONFIG_PPC_B4860) -- 2.25.1