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Thu, 08 May 2025 06:10:10 -0700 (PDT) Message-ID: <35c08d79-1473-4c1e-b605-627c4ff00a92@gmail.com> Date: Thu, 8 May 2025 15:10:09 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 4/4] ARM: dts: stm32: add initial support for stm32mp157-ultra-fly-sbc board To: Andrew Lunn Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?UTF-8?B?QsO2cmdlIFN0csO8bXBmZWw=?= , Maxime Coquelin , Alexandre Torgue , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org References: <20250505115827.29593-1-goran.radni@gmail.com> <20250505115827.29593-5-goran.radni@gmail.com> <2d0ff289-06f6-4bde-a238-097d22573d4e@lunn.ch> <63665c17-da37-4b5b-9c2d-28d5a669680f@gmail.com> <3a7ef1bd-2c0e-4637-b0b6-2c0b73388618@lunn.ch> Content-Language: en-US From: Goran Radenovic In-Reply-To: <3a7ef1bd-2c0e-4637-b0b6-2c0b73388618@lunn.ch> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Andrew, thank You once again for helpful hint. Andrew Lunn wrote: >>>> + phy-handle = <&phy1>; >>>> + >>>> + mdio { >>>> + #address-cells = <1>; >>>> + #size-cells = <0>; >>>> + compatible = "snps,dwmac-mdio"; >>>> + phy1: ethernet-phy@1 { >>>> + reg = <1>; >>>> + interrupt-parent = <&gpiod>; >>>> + interrupts = <0 IRQ_TYPE_EDGE_FALLING>; >>> PHY interrupts are 99% time level, not edge. >> That is correct, but I am facing strange behavior, when I set >> IRQ_TYPE_LEVEL_LOW. >> My board stops booting at: >> >> [ 2.343233] Waiting for root device /dev/mmcblk0p4... >> [ 12.638818] platform 5a006000.usbphyc: deferred probe pending >> [ 12.643192] platform 49000000.usb-otg: deferred probe pending >> [ 12.649029] platform 48003000.adc: deferred probe pending >> [ 12.654277] platform 5800d000.usb: deferred probe pending >> [ 12.659744] platform 5800c000.usb: deferred probe pending >> [ 12.665089] amba 58005000.mmc: deferred probe pending >> [ 12.670239] amba 58007000.mmc: deferred probe pending >> [ 12.675185] platform 50025000.vrefbuf: deferred probe pending >> >> I must investigate this. If You have any idea, You are welcome to share it. > Could be an interrupt storm. The interrupt is not getting cleared > because of something missing in the PHY driver, so it just fires again > and again. After a brief investigation, I tend to agree with your assessment that the issue lies in the driver—likely the stmmac driver — which is outside the scope of my changes. Therefore, I would suggest keeping IRQ_TYPE_EDGE_FALLING for now, or alternatively not using a hardware IRQ at all and falling back to polling, as done in stm32mp15xx-dkx.dtsi. Best regards, Goran