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mx7ulp: Only enable LDO if it is not already enabled 

LDO mode may be already enabled by the ROM and enabling it again
can cause U-Boot to hang.

Avoid this problem by only enabling LDO mode if it is initially disabled.

Reported-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Fabio Estevam 2020-02-03 09:01:09 -03:00 committed by Stefano Babic
parent 2cfdb3bca7
commit cbc81b735e
1 changed files with 14 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
arch/arm/mach-imx/mx7ulp/soc.c
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@ -118,12 +118,26 @@ void init_wdog(void)
disable_wdog(WDG2_RBASE); 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_SPL) || (defined(CONFIG_SPL) && defined(CONFIG_SPL_BUILD))
#if defined(CONFIG_LDO_ENABLED_MODE) #if defined(CONFIG_LDO_ENABLED_MODE)
static void init_ldo_mode(void) static void init_ldo_mode(void)
{ {
unsigned int reg; unsigned int reg;
if (ldo_mode_is_enabled())
return;
/* Set LDOOKDIS */ /* Set LDOOKDIS */
setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_LDOOKDIS); setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_LDOOKDIS);
@ -193,17 +207,6 @@ const char *get_imx_type(u32 imxtype)
return "7ULP"; 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) int print_cpuinfo(void)
{ {
u32 cpurev; u32 cpurev;