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(parent: 4774995) | patch
arm: mx6: ddr: add pd_fast_exit flag to system information
authorTim Harvey <tharvey@gateworks.com>
Fri, 3 Apr 2015 23:52:52 +0000 (16:52 -0700)
committerLothar Waßmann <LW@KARO-electronics.de>
Tue, 1 Sep 2015 12:41:37 +0000 (14:41 +0200)
commitc8ea0f25ba7b06a337e886ee37bbe60bdd32745e
tree8f840ad569b461a2430c815e2b46d9c198991080tree | snapshot
parent4774995a3bb14377b4fca1bfeb6dbf24fb670ebacommit | diff
arm: mx6: ddr: add pd_fast_exit flag to system information

DDR3 has a special Precharge power-down mode: fast-exit vs slow-exit.

In slow-exit mode the DLL is off but in some quiescent state that makes it easy
to turn on again in tXPDLL cycles (about 10tCK) vs the full tDLLK (512tCK).
In fast-exist mode the DLL is maintained such that it is ready again in about
3tCK.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
arch/arm/cpu/armv7/mx6/ddr.c diff | blob | history
arch/arm/include/asm/arch-mx6/mx6-ddr.h diff | blob | history
UBoot for KaRo TX COM modules