From 2cd8cd06bb01f220f75d937f0371f591712f0295 Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Mon, 17 Aug 2015 16:10:59 +0800 Subject: [PATCH] imx: mx6: ddr correct tRFC and tXS MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Cc: Stefano Babic Cc: Tim Harvey Reviewed-by: Stefano Babic --- arch/arm/cpu/armv7/mx6/ddr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c index 28fa3cf648..3ec3e791c9 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; -- 2.39.5