From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794616604; b=RL6uK8/Th+yv6SiKkQGRYhtMpLNx+a8F04iekBleyqVmft3XMI1Mjytw+4jyMH/UbdxA ogV9ldHCIbXRrGq5P1/dj26de0g5Bthl86X5luI4huGIbSz3jfL7IXk5DZ8cMR99Ra4wC UTU7fEyaDmYk7g0tjaxkkdHSx1vPuio9Dv/5X8W9kODMcqmwKhoqaa8icZ6nd40ibyJuj Fo7XHoLFJ6z++5HTxgR2LQbrgP8zPNVL/FVA5OwUMnoEGjeWgHpFUjO9jF3m5r+RcufJ0 4j97nSjHB+3QAH1aeQiF6nHt1j6RrpOMS2nSfn7Mf/rhRNeYKXutwlX2TvJeH6N/m8g== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794616604; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=Yp+Sk7rDpnMv0lHiRbr7ZiMUlaSaAn1mQuoQeSDbEd4=; b=1AUL2/J0YWXDGfJq8cP3WjO7PZnZdhv7V5U7Xw92Xs5C1avZrt0+4yYSXPsbkOCjn3L+ Ea0SlQh9374pK3D+glqVkvMzUvXDgASlhZfkYCwIIKJC9eJxazv5A1vRug4levnkLnxbc s06rXeHzNUNjDOeYSolCyPzR9TSTLhVZvoPCftGXzgum/+Ybifsj9lAZYrMHdMGQSEs8I Ak0ZEaAH/geauDPwQI3pVXjsD8W0+R9+LW9as8SAeXcm+uysZ2zdgWmoMt2a/8dF+l1li 5K6/6nbfj+O82ABXUNTy4BhmMtRCtPtNldrqfn0WPuicZJPLQnSorKBfgnhoKCVfGbg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=T08khdWj; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 330BF606A32E for ; Sat, 14 Nov 2026 00:36:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=T08khdWj Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5DCD1F000C4; Sat, 14 Nov 2026 00:36:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794616604; bh=Yp+Sk7rDpnMv0lHiRbr7ZiMUlaSaAn1mQuoQeSDbEd4=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=T08khdWj3VwAp+xMgtz4/6fHawJDCJaJtNZp4R/OxcfnYUFbugcdtXn7z5ZCtj1Pd 9gKdEBLTIdI4ms+5BaNc0SrTALZ0X0u+nqDI/UQtljnsqW65n0wugqJJvCvcOkcoye jupT/8pDBM8AhkTBwubxRHICp1Hv7rJXDb/cI0gMYvYRVRkhhD6AN8XapZS0DxRDR/ MWMstjGofK1t6X0cBZmQi930odE5jWrHa+dhe5Ouymk7Hu8Zwz8EvvWlvxlzPB5UUA FgETJCmw+5qTRyX8URDR0Fj8qoOkNcyJf1yY+qXnqvG7qVgHvlO4o5FvSb3Pn2kOCC WtLsnKzHearxQ== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH RFC 3/3] PCI: rockchip-host: Recover downstream configuration access Reply-To: sashiko-reviews@lists.linux.dev To: "Matt Thompson" Cc: linux-pci@vger.kernel.org In-Reply-To: <20261113-rfc-b4-v1-3-b91dcb502250@boondocker.io> References: <20261113-rfc-b4-v1-0-b91dcb502250@boondocker.io> <20261113-rfc-b4-v1-3-b91dcb502250@boondocker.io> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Sat, 14 Nov 2026 00:36:43 +0000 X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > From: Matt Thompson >=20 > The link status can change between the readiness check and a downstream > PCI configuration read. A link that reports up can also fail to return > a usable completion. >=20 > On arm64, annotate downstream loads for all three access widths so a > synchronous external abort returns PCIBIOS_DEVICE_NOT_FOUND with all-ones > data. Keep little-endian conversion and I/O read ordering on success. >=20 > After retraining, the controller can continue to block configuration > traffic until its AXI link-down latch is cleared. Clear the latch before > downstream config reads and writes once the link readiness checks pass. >=20 > Link: https://lore.kernel.org/linux-pci/20261024-rockchip-pcie-resume-v1-= 2-58e54a5cf5f1@iav.lv/ >=20 > Signed-off-by: Matt Thompson Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261113-rfc-b4-v1-= 0-b91dcb502250@boondocker.io?part=3D3