In case rtt_nom is set to 0 keep ODT disabled (MMDC MPODTCTRL = 0). No changes required for DDR MR1 Rtt_Nom impedance register, 0 value is already handled correctly.
No board is currently affected by this change (rtt_nom != 0 on all i.MX6 ddr3 boards), this will be used by a follow-up change.
Fixes: fe0f7f7842e1 ("mx6: add mmdc configuration for MX6Q/MX6DL") Signed-off-by: Francesco Dolcini francesco.dolcini@toradex.com --- arch/arm/mach-imx/mx6/ddr.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-imx/mx6/ddr.c b/arch/arm/mach-imx/mx6/ddr.c index 73a637c42d6c..3c87c577737b 100644 --- a/arch/arm/mach-imx/mx6/ddr.c +++ b/arch/arm/mach-imx/mx6/ddr.c @@ -1469,8 +1469,17 @@ void mx6_ddr3_cfg(const struct mx6_ddr_sysinfo *sysinfo, MMDC1(mprddqby3dl, 0x33333333); }
- /* MMDC Termination: rtt_nom:2 RZQ/2(120ohm), rtt_nom:1 RZQ/4(60ohm) */ - val = (sysinfo->rtt_nom == 2) ? 0x00011117 : 0x00022227; + /* + * MMDC Termination: rtt_nom:2 RZQ/2(120ohm), + * rtt_nom:1 RZQ/4(60ohm), + * rtt_nom:0 Disabled + */ + if (sysinfo->rtt_nom == 0) + val = 0x00000000; + else if (sysinfo->rtt_nom == 2) + val = 0x00011117; + else + val = 0x00022227; mmdc0->mpodtctrl = val; if (sysinfo->dsize > 1) MMDC1(mpodtctrl, val);