[PATCH] ARM: dts: stm32: Disable LAN8710 EDPD on DHCOM

[Marek Vasut]

On 7/23/21 5:17 PM, Alexandre TORGUE wrote:
> Hi Marek
> 
> On 7/21/21 8:12 PM, Marek Vasut wrote:
>> The LAN8710 Energy Detect Power Down (EDPD) functionality might cause
>> unreliable cable detection. There are multiple accounts of this in the
>> SMSC PHY driver patches which attempted to make EDPD reliable, however
>> it seems there is always some sort of corner case left. Unfortunatelly,
>> there is no errata documented which would confirm this to be a silicon
>> bug on the LAN87xx series of PHYs (LAN8700, LAN8710, LAN8720 at least).
>>
>> Disable EDPD on the DHCOM SoM, just like multiple other boards already
>> do as well, to make the cable detection reliable.
>>
>> Fixes: 34e0c7847dcf ("ARM: dts: stm32: Add DH Electronics DHCOM 
>> STM32MP1 SoM and PDK2 board")
>> Signed-off-by: Marek Vasut <marex at denx.de>
>> Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
>> Cc: Patrice Chotard <patrice.chotard at foss.st.com>
>> Cc: Patrick Delaunay <patrick.delaunay at foss.st.com>
>> Cc: linux-stm32 at st-md-mailman.stormreply.com
>> To: linux-arm-kernel at lists.infradead.org
>> ---
>>   arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi 
>> b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
>> index 8349c9099e301..8c41f819f7769 100644
>> --- a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
>> +++ b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
>> @@ -140,6 +140,7 @@ phy0: ethernet-phy at 1 {
>>               reset-gpios = <&gpioh 3 GPIO_ACTIVE_LOW>;
>>               reset-assert-us = <500>;
>>               reset-deassert-us = <500>;
>> +            smsc,disable-energy-detect;
>>               interrupt-parent = <&gpioi>;
>>               interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
>>           };
>>
> 
> Applied on stm32-next. Note it'll be send through a fixes branch for v5.14.

Nice, thank you