This is a workaround for hardware erratum. Write the value of 63b2_0002h to EDDRTQCFG will optimal the memory controller performance.
The value: 63b2_0002h comes from the hardware team.
Signed-off-by: Yuan Yao yao.yuan@freescale.com --- arch/arm/cpu/armv7/ls102xa/soc.c | 10 ++++++++++ arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h | 2 +- 2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/arm/cpu/armv7/ls102xa/soc.c b/arch/arm/cpu/armv7/ls102xa/soc.c index 97ba6d5..b15cd60 100644 --- a/arch/arm/cpu/armv7/ls102xa/soc.c +++ b/arch/arm/cpu/armv7/ls102xa/soc.c @@ -76,5 +76,15 @@ int arch_soc_init(void) SCFG_SNPCNFGCR_DBG_RD_WR | SCFG_SNPCNFGCR_EDMA_SNP);
+ /* + * Memory controller require a register write before being enabled. + * Affects: DDR + * Register: EDDRTQCFG + * Description: Memory controller performance is not optimal with + * default internal target queue register values. + * Workaround: Write a value of 63b2_0002h to address: 157_020Ch. + */ + out_be32(&scfg->eddrtqcfg, 0x63b20002); + return 0; } diff --git a/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h b/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h index 0527576..c584c9f 100644 --- a/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h +++ b/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h @@ -228,7 +228,7 @@ struct ccsr_scfg { u32 scfgrevcr; u32 coresrencr; u32 pex2pmrdsr; - u32 ddrc1cr; + u32 eddrtqcfg; u32 ddrc2cr; u32 ddrc3cr; u32 ddrc4cr;