diff options
Diffstat (limited to 'package/boot/uboot-sunxi/patches/093-sun6i-fix-PLL-LDO-voltselect.patch')
| -rw-r--r-- | package/boot/uboot-sunxi/patches/093-sun6i-fix-PLL-LDO-voltselect.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/package/boot/uboot-sunxi/patches/093-sun6i-fix-PLL-LDO-voltselect.patch b/package/boot/uboot-sunxi/patches/093-sun6i-fix-PLL-LDO-voltselect.patch new file mode 100644 index 0000000000..e6af765cae --- /dev/null +++ b/package/boot/uboot-sunxi/patches/093-sun6i-fix-PLL-LDO-voltselect.patch @@ -0,0 +1,77 @@ +From b2b385df5095fff80b4655142f58a2a6801e6c80 Mon Sep 17 00:00:00 2001 +From: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> +Date: Tue, 6 Jan 2015 21:26:44 +0100 +Subject: sun6i: Fix and document PLL LDO voltage selection + +The PRCM_PLL_CTRL_LDO_OUT_L and PRCM_PLL_CTRL_LDO_OUT_H macros had +their meaning reversed. This is fixed by this change-set. With this +changed, the PRCM_PLL_CTRL_LDO_OUT_L(1370) now becomes self-evident +as setting the voltage to 1.37v (which it had done all along, even +though stating a different target voltage). + +After changing the PLL LDO setting, it will take a little while for +the voltage output to settle. A sdelay()-based loop waits the same +order of magnitude as Boot1. + +Furthermore, a bit of documentation is added to clarify that the +required setting for the PLL LDO is 1.37v as per the A31 manual. + +diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c +index fa7ebd8..3a6e56e 100644 +--- a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c ++++ b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c +@@ -24,14 +24,27 @@ void clock_init_safe(void) + struct sunxi_prcm_reg * const prcm = + (struct sunxi_prcm_reg *)SUNXI_PRCM_BASE; + +- /* Set PLL ldo voltage without this PLL6 does not work properly */ ++ /* Set PLL ldo voltage without this PLL6 does not work properly. ++ * ++ * As the A31 manual states, that "before enable PLL, PLLVDD ++ * LDO should be set to 1.37v", we need to configure this to 2.5v ++ * in the "PLL Input Power Select" (0 << 15) and (7 << 16). ++ */ + clrsetbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK, + PRCM_PLL_CTRL_LDO_KEY); + clrsetbits_le32(&prcm->pll_ctrl1, ~PRCM_PLL_CTRL_LDO_KEY_MASK, + PRCM_PLL_CTRL_LDO_DIGITAL_EN | PRCM_PLL_CTRL_LDO_ANALOG_EN | +- PRCM_PLL_CTRL_EXT_OSC_EN | PRCM_PLL_CTRL_LDO_OUT_L(1140)); ++ PRCM_PLL_CTRL_EXT_OSC_EN | PRCM_PLL_CTRL_LDO_OUT_L(1370) ); + clrbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK); + ++ /* Give the PLL LDO voltage setting some time to take hold. ++ * Notes: ++ * 1) We need to use sdelay() as the timers aren't set up yet. ++ * 2) The 100k iterations come from Boot1, which spin's for 100k ++ * iterations through a loop. ++ */ ++ sdelay(100000); ++ + clock_set_pll1(408000000); + + writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div); +diff --git a/arch/arm/include/asm/arch-sunxi/prcm.h b/arch/arm/include/asm/arch-sunxi/prcm.h +index 82ed541..41a62a4 100644 +--- a/arch/arm/include/asm/arch-sunxi/prcm.h ++++ b/arch/arm/include/asm/arch-sunxi/prcm.h +@@ -111,13 +111,13 @@ + #define PRCM_PLL_CTRL_LDO_OUT_MASK \ + __PRCM_PLL_CTRL_LDO_OUT(0x7) + /* When using the low voltage 20 mV steps, and high voltage 30 mV steps */ +-#define PRCM_PLL_CTRL_LDO_OUT_L(n) \ +- __PRCM_PLL_CTRL_VDD_LDO_OUT((((n) - 1000) / 20) & 0x7) + #define PRCM_PLL_CTRL_LDO_OUT_H(n) \ ++ __PRCM_PLL_CTRL_VDD_LDO_OUT((((n) - 1000) / 20) & 0x7) ++#define PRCM_PLL_CTRL_LDO_OUT_L(n) \ + __PRCM_PLL_CTRL_VDD_LDO_OUT((((n) - 1160) / 30) & 0x7) +-#define PRCM_PLL_CTRL_LDO_OUT_LV(n) \ +- __PRCM_PLL_CTRL_VDD_LDO_OUT((((n) & 0x7) * 20) + 1000) + #define PRCM_PLL_CTRL_LDO_OUT_HV(n) \ ++ __PRCM_PLL_CTRL_VDD_LDO_OUT((((n) & 0x7) * 20) + 1000) ++#define PRCM_PLL_CTRL_LDO_OUT_LV(n) \ + __PRCM_PLL_CTRL_VDD_LDO_OUT((((n) & 0x7) * 30) + 1160) + #define PRCM_PLL_CTRL_LDO_KEY (0xa7 << 24) + #define PRCM_PLL_CTRL_LDO_KEY_MASK (0xff << 24) +-- +cgit v0.10.2 + |