diff options
| author | Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com> | 2014-06-25 11:03:35 -0500 |
|---|---|---|
| committer | Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com> | 2014-06-26 13:56:37 -0500 |
| commit | 6bc15c5fee23d7a70122a947762fce1192b9ddb4 (patch) | |
| tree | 398674e1f86354b1b2fb996dd5577ee14baac22b | |
| parent | 2a69800d94f182e975e4ed3ae2e64d30d35a3603 (diff) | |
ENGR00320048 ARM:imx6sl:Ensure that bandgap is not disabled in LDO-enabled mode
The main bandgap is required for regulation in LDO-enabled mode.
Ensure that the main bandgap is only disabled in LDO-bypass mode
when entering low power IDLE.
Signed-off-by: Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com>
| -rw-r--r-- | arch/arm/mach-imx/imx6sl_wfi.S | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/imx6sl_wfi.S b/arch/arm/mach-imx/imx6sl_wfi.S index f8556e67631e..e1cb9fa90b06 100644 --- a/arch/arm/mach-imx/imx6sl_wfi.S +++ b/arch/arm/mach-imx/imx6sl_wfi.S @@ -425,6 +425,17 @@ podf_loop: bic r6, r6, #0x1 str r6, [r3, #0x130] + /* + * Cannot disable regular bandgap + * in LDO-enabled mode. The bandgap + * is required for ARM-LDO to regulate + * the voltage. + */ + ldr r6, [r3, #0x140] + and r6, r6, #0x1f + cmp r6, #0x1f + bne leave_bandgap_enabled + /* Enable low power bandgap */ ldr r6, [r3, #0x260] orr r6, r6, #0x20 @@ -453,6 +464,7 @@ podf_loop: orr r6, r6, #0x1 str r6, [r3, #0x150] +leave_bandgap_enabled: leave_2p5_on: b do_wfi @@ -506,6 +518,16 @@ podf_loop1: cmp r12, #1 beq ldo2p5_not_disabled + /* + * Regular bandgap will not be disabled + * in LDO-enabled mode as it is required + * for ARM-LDO to regulate the voltage. + */ + ldr r6, [r3, #0x140] + and r6, r6, #0x1f + cmp r6, #0x1f + bne skip_bandgap_restore + /* Power up the regular bandgap. */ ldr r6, [r3, #0x150] bic r6, r6, #0x1 @@ -524,6 +546,7 @@ podf_loop1: bic r6, r6, #0x20 str r6, [r3, #0x260] +skip_bandgap_restore: /* Enable main 2p5. */ ldr r6, [r3, #0x130] orr r6, r6, #0x1 |