| Message ID | 1335960737-517-1-git-send-email-dirk.behme@de.bosch.com |
|---|---|
| State | Accepted |
| Commit | cac833a98cf7e111bd07b15fe59ef85fca1c46e7 |
| Delegated to: | Stefano Babic |
| Headers | show |
On 02/05/2012 14:12, Dirk Behme wrote: > Init the core regulator voltage to 1.2V. This is required for the correct > functioning of the GPU and when the ARM LDO is set to 1.225V. This is a > workaround to fix some memory clock jitter. > > Note: This should be but can't be done in the DCD. The bootloader > prevents access to the ANATOP registers. > > Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> > CC: Jason Chen <b02280@freescale.com> > CC: Jason Liu <r64343@freescale.com> > CC: Ranjani Vaidyanathan <ra5478@freescale.com> > CC: Stefano Babic <sbabic@denx.de> > CC: Fabio Estevam <festevam@gmail.com> > --- Applied to u-boot-imx, thanks. Best regards, Stefano Babic
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index 543b2cc..90f2088 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -77,10 +77,40 @@ void init_aips(void) writel(0x00000000, &aips2->opacr4); } +/* + * Set the VDDSOC + * + * Mask out the REG_CORE[22:18] bits (REG2_TRIG) and set + * them to the specified millivolt level. + * Possible values are from 0.725V to 1.450V in steps of + * 0.025V (25mV). + */ +void set_vddsoc(u32 mv) +{ + struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR; + u32 val, reg = readl(&anatop->reg_core); + + if (mv < 725) + val = 0x00; /* Power gated off */ + else if (mv > 1450) + val = 0x1F; /* Power FET switched full on. No regulation */ + else + val = (mv - 700) / 25; + + /* + * Mask out the REG_CORE[22:18] bits (REG2_TRIG) + * and set them to the calculated value (0.7V + val * 0.25V) + */ + reg = (reg & ~(0x1F << 18)) | (val << 18); + writel(reg, &anatop->reg_core); +} + int arch_cpu_init(void) { init_aips(); + set_vddsoc(1200); /* Set VDDSOC to 1.2V */ + return 0; } #endif diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h index 668e77a..699e0b0 100644 --- a/arch/arm/include/asm/arch-mx6/sys_proto.h +++ b/arch/arm/include/asm/arch-mx6/sys_proto.h @@ -28,6 +28,8 @@ u32 get_cpu_rev(void); +void set_vddsoc(u32 mv); + /* * Initializes on-chip ethernet controllers. * to override, implement board_eth_init()
Init the core regulator voltage to 1.2V. This is required for the correct functioning of the GPU and when the ARM LDO is set to 1.225V. This is a workaround to fix some memory clock jitter. Note: This should be but can't be done in the DCD. The bootloader prevents access to the ANATOP registers. Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> CC: Jason Chen <b02280@freescale.com> CC: Jason Liu <r64343@freescale.com> CC: Ranjani Vaidyanathan <ra5478@freescale.com> CC: Stefano Babic <sbabic@denx.de> CC: Fabio Estevam <festevam@gmail.com> --- v2: Rename the function set_vddsoc(mV) and export it as discused in http://lists.denx.de/pipermail/u-boot/2012-April/122946.html arch/arm/cpu/armv7/mx6/soc.c | 30 +++++++++++++++++++++++++++++ arch/arm/include/asm/arch-mx6/sys_proto.h | 2 + 2 files changed, 32 insertions(+), 0 deletions(-)