From: sashiko-bot@kernel.org
To: "Matt Thompson" <matt@boondocker.io>
Cc: linux-pci@vger.kernel.org
Subject: Re: [PATCH RFC 3/3] PCI: rockchip-host: Recover downstream configuration access
Date: Sat, 14 Nov 2026 00:36:43 +0000 [thread overview]
Message-ID: <sashiko-outbox-213937@kernel.org> (raw)
In-Reply-To: <20261113-rfc-b4-v1-3-b91dcb502250@boondocker.io>
> From: Matt Thompson <matt@boondocker.io>
>
> 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.
>
> 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.
>
> 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.
>
> Link: https://lore.kernel.org/linux-pci/20261024-rockchip-pcie-resume-v1-2-58e54a5cf5f1@iav.lv/
>
> Signed-off-by: Matt Thompson <matt@boondocker.io>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261113-rfc-b4-v1-0-b91dcb502250@boondocker.io?part=3
prev parent reply other threads:[~2026-11-14 0:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-14 0:28 [PATCH RFC 0/3] PCI: rockchip-host: Handle unavailable downstream config space Matt Thompson via B4 Relay
2026-11-14 0:28 ` [PATCH RFC 1/3] PCI: rockchip-host: Skip downstream config access while link is down Matt Thompson via B4 Relay
2026-11-14 0:38 ` sashiko-bot
2026-11-14 0:28 ` [PATCH RFC 2/3] arm64: Allow synchronous abort fixups for guarded MMIO reads Matt Thompson via B4 Relay
2026-11-14 0:41 ` sashiko-bot
2026-11-14 0:28 ` [PATCH RFC 3/3] PCI: rockchip-host: Recover downstream configuration access Matt Thompson via B4 Relay
2026-11-14 0:36 ` sashiko-bot [this message]
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