Hi Peng,
On Mon, Feb 3, 2020 at 9:07 AM Peng Fan peng.fan@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/8d66e5aae5b32261c9e2757c384...
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;elsereturn 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;elsereturn false;-}
int print_cpuinfo(void) { u32 cpurev; -- 2.17.1