[PATCH 2/2] ARM: dts: imx6: pfla02: Fix SD card reboot problem
Andrej Picej
andrej.picej at norik.com
Wed Jul 5 01:40:37 PDT 2023
On 5. 07. 23 10:30, Ahmad Fatoum wrote:
> On 05.07.23 10:28, Andrej Picej wrote:
>> Hi Marco,
>>
>> On 4. 07. 23 10:17, Marco Felsch wrote:
>>> On 23-07-04, Andrej Picej wrote:
>>>> If regulator is not marked as always-on the regulator gets disabled on
>>>> reboot breaking the next boot.
>>>>
>>>> Signed-off-by: Andrej Picej <andrej.picej at norik.com>
>>>> ---
>>>> arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi | 1 +
>>>> 1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi b/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi
>>>> index 80adb2a02cc9..25d6a036d5b8 100644
>>>> --- a/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi
>>>> +++ b/arch/arm/boot/dts/imx6qdl-phytec-pfla02.dtsi
>>>> @@ -192,6 +192,7 @@ vdd_3v3_pmic_io_reg: ldo6 {
>>>> vdd_sd0_reg: ldo9 {
>>>> regulator-min-microvolt = <3300000>;
>>>> regulator-max-microvolt = <3300000>;
>>>> + regulator-always-on;
>>>
>>> I think this is the supply for the sd-card, so you can make use of
>>> 'vmmc-supply'.
>>
>> This is already the case:
>>
>>> &usdhc3 {
>>> pinctrl-names = "default";
>>> pinctrl-0 = <&pinctrl_usdhc3
>>> &pinctrl_usdhc3_cdwp>;
>>> cd-gpios = <&gpio1 27 GPIO_ACTIVE_LOW>;
>>> wp-gpios = <&gpio1 29 GPIO_ACTIVE_HIGH>;
>>> vmmc-supply = <&vdd_sd0_reg>;
>>> status = "disabled";
>>> };
>>
>> I think the main reason for a failed boot is that the PMIC doesn't get reset and that the bootloader doesn't specifically enable the SD card regulator.
>>
>> Could this patch still be applied or should we put the fix in reset routine/bootloader?
>
> Is SD-Card not main boot medium? From your description, I thought BootROM
> will fail to boot before bootloader has a chance to do anything about it.
>
Yes sorry, you are absolutly right, the BootROM fails. It confused me
because I could see the booloader booting, but it was from one of the
fallback mediums. So I guess fixing the bootloader is not really an option.
Sorry for the confusion.
>>
>> Best regards,
>> Andrej
>>
>>>
>>> Regards,
>>> Marco
>>>
>>>> };
>>>> vdd_sd1_reg: ldo10 {
>>>> --
>>>> 2.25.1
>>>>
>>>>
>>>>
>>
>>
>
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