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charset=UTF-8 Content-Transfer-Encoding: 8bit On 05/11/2026 18:40, Enrique Hernández Bello wrote: > On Thu, Nov 05, 2026, Krzysztof Kozlowski wrote: >> Vendor driver does not matter, it is antipattern. Do not mention it here >> as reason to do such change. >> >> No need to repeat the diff. > > Understood, both go in the next version. > >> us or ms? > > ms. The 0 case is badly worded: the driver never holds PERST# for less > than 100 us, whatever the value, and 0 just ends up at that floor. I will > describe the floor instead of giving 0 a meaning of its own. > >> What is the nature of this timing? 100 ms is a lot. Are you sure you are >> not describing RC delay (we have bindings for that already) > > The 100 ms is not something the board needs. It is the driver's current > wait, T_PVPERL from the CEM spec, applied on every board. Because PERST# > is already asserted when that wait starts, it is also the width of the > reset pulse. > > On my board (ROCK Pi 4C) the slot supply is regulator-always-on, so power > has been stable for seconds before probe and there is nothing left to > settle. The problem goes the other way: the JMB585 behind it stops So maybe that's JMB585 issue? Arguments so far are rather against controller-based property. > answering configuration reads when it is held in reset that long. A wait > of 0 to 15 ms enumerated 17 times out of 17, 20 ms once out of 3, and > 100 ms never in 5. So the board needs a shorter value, not a longer one. > I do not know why this endpoint behaves this way. > > Which binding did you have in mind for the RC delay? If an existing one > fits, I would rather use it. The RC delay binding, gpio-delay. > > I also plan to drop rockchip,s2r-perst-inactive-ms, since it describes > an OS power state rather than the hardware. > > Thanks, > Enrique Best regards, Krzysztof From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6AD73606A31B for ; Thu, 5 Nov 2026 18:24:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=PoP5bjyJ; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=BD2aCl8r DKIM-Signature: v=1; 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Thu, 05 Nov 2026 18:24:26 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 3383F41B3A; Thu, 5 Nov 2026 18:24:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5C4E1F00919; Thu, 5 Nov 2026 18:24:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793903063; bh=cjUElBqzPluT7QSjt/7lModkJ2Ig4dFvcYSz+eg2RbU=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=BD2aCl8ryPB4H4ifilP0HoKNxJrE3LkzDcHnc1GOhqqO09ag549Bc6WQDr5ixwtS8 zkyMJkM9JwQ62U/YHXrczFfQ6L0mWX5u67BFPPe2elik8/x/0otCRECNlx6FLnOJtw GQ6eUI8iYMkN+re4rVqNG2LZ9wnG1lWgTK4Q2EuGFc/P2poedu5vTRLq8XNFK2U0yR 4XTrfa2AKVSgz7Cx0/OqJqptghvWSLDYxND7Of6dlboNOaRVRgPGu1knF54Ykc7sh/ tuuVC+LvthIg1J11BJp5xuGAYjDxPNnTsHT3UpynFhly7WBkbWugbX4l1ZR5mT/E32 051o+m+YKGn+g== Message-ID: Date: Thu, 5 Nov 2026 19:24:15 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/2] dt-bindings: PCI: rockchip,rk3399-pcie: Add PERST# inactive delay properties To: =?UTF-8?Q?Enrique_Hern=C3=A1ndez_Bello?= Cc: shawn.lin@rock-chips.com, lpieralisi@kernel.org, kwilczynski@kernel.org, mani@kernel.org, bhelgaas@google.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, heiko@sntech.de, dlemoal@kernel.org, iav@iav.lv, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20261104215848.2087944-1-ehbello@gmail.com> <20261104215848.2087944-2-ehbello@gmail.com> <20261105-exuberant-finch-of-domination-3fbd6c@quoll> <20261105174042.2307139-1-ehbello@gmail.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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