Hi Peng, On Mon, Feb 3, 2020 at 9:07 AM Peng Fan <peng....@nxp.com> wrote:
> Just have a question, LDO mode enabled by ROM, this is configured with fuse? I looked at the fuse map and did not see a fuse that controls it. > Is there any special configuration need to be done in Linux? I not touch this > part before (: In LDO-enabled mode cpufreq needs to be disabled. Please see: https://github.com/fabioestevam/linux-imx/commit/8d66e5aae5b32261c9e2757c3844438c98ed0dfe The reason is that in LDO-enabled mode only RUN mode at 500MHz is supported. HSRUN at 720MHz is not supported in LDO-enabled mode, so ROM boots at 500MHz and kernel keeps always running at this frequency. Regards, Fabio Estevam > > Thanks, > Peng. > > > --- > > Changes since v1: > > - Drop the define changes as they are duplicated (Stefano). > > > > arch/arm/mach-imx/mx7ulp/soc.c | 25 ++++++++++++++----------- > > 1 file changed, 14 insertions(+), 11 deletions(-) > > > > diff --git a/arch/arm/mach-imx/mx7ulp/soc.c > > b/arch/arm/mach-imx/mx7ulp/soc.c index d8d691692c..0d39dab7ea 100644 > > --- a/arch/arm/mach-imx/mx7ulp/soc.c > > +++ b/arch/arm/mach-imx/mx7ulp/soc.c > > @@ -118,12 +118,26 @@ void init_wdog(void) > > disable_wdog(WDG2_RBASE); > > } > > > > +static bool ldo_mode_is_enabled(void) > > +{ > > + unsigned int reg; > > + > > + reg = readl(PMC0_BASE_ADDR + PMC0_CTRL); > > + if (reg & PMC0_CTRL_LDOEN) > > + return true; > > + else > > + return false; > > +} > > + > > #if !defined(CONFIG_SPL) || (defined(CONFIG_SPL) && > > defined(CONFIG_SPL_BUILD)) #if defined(CONFIG_LDO_ENABLED_MODE) > > static void init_ldo_mode(void) { > > unsigned int reg; > > > > + if (ldo_mode_is_enabled()) > > + return; > > + > > /* Set LDOOKDIS */ > > setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, > > PMC0_CTRL_LDOOKDIS); > > > > @@ -193,17 +207,6 @@ const char *get_imx_type(u32 imxtype) > > return "7ULP"; > > } > > > > -static bool ldo_mode_is_enabled(void) > > -{ > > - unsigned int reg; > > - > > - reg = readl(PMC0_BASE_ADDR + PMC0_CTRL); > > - if (reg & PMC0_CTRL_LDOEN) > > - return true; > > - else > > - return false; > > -} > > - > > int print_cpuinfo(void) > > { > > u32 cpurev; > > -- > > 2.17.1 >