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| author | Peng Fan <Peng.Fan@freescale.com> | 2015-08-17 16:10:59 +0800 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2015-09-02 15:34:12 +0200 |
| commit | 2cd8cd06bb01f220f75d937f0371f591712f0295 (patch) | |
| tree | 8a73be24fb0f8d1d6300090c357c3958810b659e /arch | |
| parent | 24139754f55e11a41bd90d0c8064a79228b573a3 (diff) | |
| download | u-boot-imx-2cd8cd06bb01f220f75d937f0371f591712f0295.zip u-boot-imx-2cd8cd06bb01f220f75d937f0371f591712f0295.tar.gz u-boot-imx-2cd8cd06bb01f220f75d937f0371f591712f0295.tar.bz2 | |
imx: mx6: ddr correct tRFC and tXS
To Chip density 4Gb, tRFC should be 300ns, see
"Table 61 — Refresh parameters by device density" of JESD79-3E.
tXS(min) is max(5nCK, tRFC(min) + 10ns).
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/mx6/ddr.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c index 28fa3cf..3ec3e79 100644 --- a/arch/arm/cpu/armv7/mx6/ddr.c +++ b/arch/arm/cpu/armv7/mx6/ddr.c @@ -357,8 +357,8 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *sysinfo, txs = DIV_ROUND_UP(170000, clkper) - 1; break; case 4: /* 4Gb per chip */ - trfc = DIV_ROUND_UP(260000, clkper) - 1; - txs = DIV_ROUND_UP(270000, clkper) - 1; + trfc = DIV_ROUND_UP(300000, clkper) - 1; + txs = DIV_ROUND_UP(310000, clkper) - 1; break; case 8: /* 8Gb per chip */ trfc = DIV_ROUND_UP(350000, clkper) - 1; |