Re: [PATCH] ARM: dts: exynos: Fix invalid maximum voltage for buck9 supplying SD card

[Markus Reichl]

Hi Krzysztof,

with this patch on Odroid XU4 I get the following dmesg|grep vdd_2.8v_ldo:

[    1.739943] vdd_2.8v_ldo: override max_uV, 3755000 -> 3750000
[    1.740905] vdd_2.8v_ldo: 3000 <--> 3750 mV at 5000 mV 

Regards,
--
Markus Reichl
Am 24.03.2016 um 09:12 schrieb Krzysztof Kozlowski:
> The buck9 regulator of S2MPS11 PMIC had incorrect maximum voltage -
> lower by 5 mV than specified by datasheet. This buck9 provides power to
> other regulators, including LDO13 and LDO19 which supply the MMC2 (SD
> card).
> 
> When constraints were applied, the depending regulators were not
> providing enough power, leading to SD card detection errors:
> 	mmc1: card never left busy state
> 	mmc1: error -110 whilst initialising SD card
> 
> Fixes: 86a2d2ac5e5d ("ARM: dts: Add dts file for Odroid XU3 board")
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> 
> ---
> 
> The issue can be reproduced on next-20160324 with
> bae4fdc88d7f7dda1 (regulator: core: Ensure we are at least in bounds for our constraints).
> ---
>  arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index 1bd507bfa750..82b2ba632cf6 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -299,7 +299,7 @@
>  			buck9_reg: BUCK9 {
>  				regulator-name = "vdd_2.8v_ldo";
>  				regulator-min-microvolt = <3000000>;
> -				regulator-max-microvolt = <3750000>;
> +				regulator-max-microvolt = <3755000>;
>  				regulator-always-on;
>  				regulator-boot-on;
>  			};
>