Signed-off-by: Otavio Salvador otavio@ossystems.com.br --- Changes in v2: - add comments - fix when we have vbus OR vdd5v - improve patch short description
Changes in v3: - change short-description prefix
arch/arm/cpu/arm926ejs/mx28/spl_power_init.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c index 4b09b0c..fdf810c 100644 --- a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c +++ b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c @@ -564,6 +564,15 @@ void mx28_batt_boot(void) 0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET); }
+static int mx28_valid_vbus(void) +{ + struct mx28_power_regs *power_regs = + (struct mx28_power_regs *)MXS_POWER_BASE; + + /* iMX23 uses POWER_STS_VBUSVALID_STATUS at same offset */ + return readl(&power_regs->hw_power_sts) & POWER_STS_VBUSVALID0_STATUS; +} + void mx28_handle_5v_conflict(void) { struct mx28_power_regs *power_regs = @@ -577,14 +586,19 @@ void mx28_handle_5v_conflict(void) tmp = readl(&power_regs->hw_power_sts);
if (tmp & POWER_STS_VDDIO_BO) { + /* + * VDDIO has a brownout, then the VDD5V_GT_VDDIO becomes + * unreliable + */ mx28_powerdown(); break; }
- if (tmp & POWER_STS_VDD5V_GT_VDDIO) { + if (mx28_valid_vbus() || (tmp & POWER_STS_VDD5V_GT_VDDIO)) { mx28_boot_valid_5v(); break; } else { + /* Neither 5v sees 5v so we power down */ mx28_powerdown(); break; } @@ -601,17 +615,15 @@ void mx28_5v_boot(void) struct mx28_power_regs *power_regs = (struct mx28_power_regs *)MXS_POWER_BASE;
- /* - * NOTE: In original IMX-Bootlets, this also checks for VBUSVALID, - * but their implementation always returns 1 so we omit it here. - */ - if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) { + if (mx28_valid_vbus() && + (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO)) { mx28_boot_valid_5v(); return; }
early_delay(1000); - if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) { + if (mx28_valid_vbus() && + (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO)) { mx28_boot_valid_5v(); return; }