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rockchip: arm64: rk3399: support DDR3-1866 (i.e. 933MHz clock)

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The RK3399 is capable of driving DDR3 at 933MHz (i.e. DDR3-1866),
if the PCB layout permits and appropriate memory timings are used.

This changes the sanity checks to allow a DTS to request DDR3-1866
operation.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Philipp Tomsich 2017-05-31 18:16:35 +02:00 committed by Simon Glass
parent fbecb94e4b
commit fcb2158516
1 changed files with 1 additions and 1 deletions
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arch/arm/mach-rockchip/rk3399/sdram_rk3399.c
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@ -1087,7 +1087,7 @@ static int sdram_init(struct dram_info *dram,
debug("Starting SDRAM initialization...\n");
if ((dramtype == DDR3 && ddr_freq > 800) ||
if ((dramtype == DDR3 && ddr_freq > 933) ||
(dramtype == LPDDR3 && ddr_freq > 933) ||
(dramtype == LPDDR4 && ddr_freq > 800)) {
debug("SDRAM frequency is to high!");