shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-09 12:17:12 +09:00
Code Issues Packages Projects Releases Wiki Activity

DDR3 ODT reduce from 120ohm to 60ohm

Browse Source
This commit is contained in:
hecanyang
2012-04-28 15:18:14 +08:00
parent e372e904d2
commit 4d2fbd0f74
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/mach-rk30/ddr.c
View File

@@ -1284,6 +1284,9 @@ static __sramfunc void ddr_adjust_config(uint32_t dram_type)
idle_port();
move_to_Config_state();
//extend capability for debug
pGRF_Reg->GRF_SOC_CON[2] = rank_to_row15_en;
//set data training address
pPHY_Reg->DTAR = value;
@@ -1293,7 +1296,7 @@ static __sramfunc void ddr_adjust_config(uint32_t dram_type)
//adjust DRV and ODT
if(dram_type == DDR3)
{
pPHY_Reg->ZQ0CR[1] = 0x1B; //DS=40ohm,ODT=120ohm
pPHY_Reg->ZQ0CR[1] = 0x5B; //DS=40ohm,ODT=60ohm
pPHY_Reg->ZQ0CR[0] |= (1<<30); //trigger
}
if (dram_type == DDR2)