From: Emilio López emilio@elopez.com.ar
For qualifying hardware, we can run MBUS at 400MHz without risking stability if we raise the DCDC3 voltage to 1.3V .
This is desirable since on A20 the MBUS is a significant bottle-neck for some workloads.
This has been tested on 50 pieces of Cubieboard2 by Cubietech and no issues of any kind were reported.
Signed-off-by: Emilio López emilio@elopez.com.ar Signed-off-by: Hans de Goede hdegoede@redhat.com --- arch/arm/cpu/armv7/sunxi/dram.c | 6 +++++- board/sunxi/board.c | 4 ++++ boards.cfg | 4 ++-- 3 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/arch/arm/cpu/armv7/sunxi/dram.c b/arch/arm/cpu/armv7/sunxi/dram.c index 781f9b5..9061f98 100644 --- a/arch/arm/cpu/armv7/sunxi/dram.c +++ b/arch/arm/cpu/armv7/sunxi/dram.c @@ -217,7 +217,11 @@ static void mctl_setup_dram_clock(u32 clk)
/* setup MBUS clock */ reg_val = CCM_MBUS_CTRL_GATE | -#if defined(CONFIG_SUN7I) +#if defined(CONFIG_SUN7I) && defined(CONFIG_FAST_MBUS) + CCM_MBUS_CTRL_CLK_SRC(CCM_MBUS_CTRL_CLK_SRC_PLL6) | + CCM_MBUS_CTRL_N(CCM_MBUS_CTRL_N_X(1)) | + CCM_MBUS_CTRL_M(CCM_MBUS_CTRL_M_X(3)); +#elif defined(CONFIG_SUN7I) && !defined(CONFIG_FAST_MBUS) CCM_MBUS_CTRL_CLK_SRC(CCM_MBUS_CTRL_CLK_SRC_PLL6) | CCM_MBUS_CTRL_N(CCM_MBUS_CTRL_N_X(2)) | CCM_MBUS_CTRL_M(CCM_MBUS_CTRL_M_X(2)); diff --git a/board/sunxi/board.c b/board/sunxi/board.c index e9801b9..4dadf2b 100644 --- a/board/sunxi/board.c +++ b/board/sunxi/board.c @@ -84,7 +84,11 @@ void sunxi_board_init(void) #ifdef CONFIG_AXP209_POWER power_failed |= axp209_init(); power_failed |= axp209_set_dcdc2(1400); +#ifdef CONFIG_FAST_MBUS + power_failed |= axp209_set_dcdc3(1300); +#else power_failed |= axp209_set_dcdc3(1250); +#endif power_failed |= axp209_set_ldo2(3000); power_failed |= axp209_set_ldo3(2800); power_failed |= axp209_set_ldo4(2800); diff --git a/boards.cfg b/boards.cfg index 20f7510..82d2c6a 100644 --- a/boards.cfg +++ b/boards.cfg @@ -355,8 +355,8 @@ Active arm armv7 s5pc1xx samsung smdkc100 Active arm armv7 socfpga altera socfpga socfpga_cyclone5 - - Active arm armv7 sunxi - sunxi A10-OLinuXino-Lime sun4i:A10_OLINUXINO_L,AXP209_POWER,SPL - Active arm armv7 sunxi - sunxi A10s-OLinuXino-M sun5i:A10S_OLINUXINO_M,AXP152_POWER,SPL - -Active arm armv7 sunxi - sunxi Cubietruck sun7i:CUBIETRUCK,AXP209_POWER,SPL - -Active arm armv7 sunxi - sunxi Cubietruck_FEL sun7i:CUBIETRUCK,AXP209_POWER,SPL_FEL - +Active arm armv7 sunxi - sunxi Cubietruck sun7i:CUBIETRUCK,AXP209_POWER,FAST_MBUS,SPL - +Active arm armv7 sunxi - sunxi Cubietruck_FEL sun7i:CUBIETRUCK,AXP209_POWER,FAST_MBUS,SPL_FEL - Active arm armv7 u8500 st-ericsson snowball snowball - Mathieu Poirier mathieu.poirier@linaro.org Active arm armv7 u8500 st-ericsson u8500 u8500_href - - Active arm armv7 vf610 freescale vf610twr vf610twr vf610twr:IMX_CONFIG=board/freescale/vf610twr/imximage.cfg Alison Wang b18965@freescale.com