diff options
| author | Francesco Dolcini <francesco.dolcini@toradex.com> | 2022-05-18 15:38:49 +0200 |
|---|---|---|
| committer | Francesco Dolcini <francesco.dolcini@toradex.com> | 2022-06-27 13:27:02 +0000 |
| commit | 08de429cd3a25e691dc73aff1762210f7f908562 (patch) | |
| tree | ba584d01d95513408c06eda2e8ba26e0b7226944 | |
| parent | 993e386bbae9367138b2fd2af0a37b77aed49012 (diff) | |
mx6: ddr: Fix disabling on-die termination
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>
| -rw-r--r-- | arch/arm/mach-imx/mx6/ddr.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm/mach-imx/mx6/ddr.c b/arch/arm/mach-imx/mx6/ddr.c index a23fb6f8c6..5189bdc5f4 100644 --- a/arch/arm/mach-imx/mx6/ddr.c +++ b/arch/arm/mach-imx/mx6/ddr.c @@ -1454,8 +1454,17 @@ 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); |