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From: Marek Vasut <marek.vasut@gmail.com>
To: Sasha Levin <sashal@kernel.org>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Marek Vasut <marek.vasut+renesas@gmail.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Wolfram Sang <wsa@the-dreams.de>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	linux-renesas-soc@vger.kernel.org, linux-pci@vger.kernel.org
Subject: Re: [PATCH AUTOSEL 5.14 12/32] PCI: rcar: Add L1 link state fix into data abort hook
Date: Sat, 11 Sep 2021 18:05:37 +0200	[thread overview]
Message-ID: <6cbfadee-0d74-fa4c-9ef3-a1bce55632bb@gmail.com> (raw)
In-Reply-To: <20210911131149.284397-12-sashal@kernel.org>

On 9/11/21 3:11 PM, Sasha Levin wrote:
> From: Marek Vasut <marek.vasut+renesas@gmail.com>
> 
> [ Upstream commit a115b1bd3af0c2963e72f6e47143724c59251be6 ]
> 
> When the link is in L1, hardware should return it to L0
> automatically whenever a transaction targets a component on the
> other end of the link (PCIe r5.0, sec 5.2).
> 
> The R-Car PCIe controller doesn't handle this transition correctly.
> If the link is not in L0, an MMIO transaction targeting a downstream
> device fails, and the controller reports an ARM imprecise external
> abort.
> 
> Work around this by hooking the abort handler so the driver can
> detect this situation and help the hardware complete the link state
> transition.
> 
> When the R-Car controller receives a PM_ENTER_L1 DLLP from the
> downstream component, it sets PMEL1RX bit in PMSR register, but then
> the controller enters some sort of in-between state.  A subsequent
> MMIO transaction will fail, resulting in the external abort.  The
> abort handler detects this condition and completes the link state
> transition by setting the L1IATN bit in PMCTLR and waiting for the
> link state transition to complete.

You will also need the following patch, otherwise the build will fail on 
configurations without COMMON_CLK (none where this driver is used, but 
happened on one of the build bots). I'm waiting for PCIe maintainers to 
pick it up:
https://patchwork.kernel.org/project/linux-pci/patch/20210907144512.5238-1-marek.vasut@gmail.com/

  reply	other threads:[~2021-09-11 16:05 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-11 13:11 [PATCH AUTOSEL 5.14 01/32] dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 02/32] remoteproc: qcom: wcnss: Fix race with iris probe Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 03/32] mfd: db8500-prcmu: Adjust map to reality Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 04/32] PCI: Add ACS quirks for NXP LX2xx0 and LX2xx2 platforms Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 05/32] fuse: fix use after free in fuse_read_interrupt() Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 06/32] PCI: tegra194: Fix handling BME_CHGED event Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 07/32] PCI: tegra194: Fix MSI-X programming Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 08/32] PCI: tegra: Fix OF node reference leak Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 09/32] mfd: Don't use irq_create_mapping() to resolve a mapping Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 10/32] PCI: rcar: Fix runtime PM imbalance in rcar_pcie_ep_probe() Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 11/32] riscv: fix the global name pfn_base confliction error Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 12/32] PCI: rcar: Add L1 link state fix into data abort hook Sasha Levin
2021-09-11 16:05   ` Marek Vasut [this message]
2021-09-20 12:12     ` Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 13/32] KVM: arm64: Make hyp_panic() more robust when protected mode is enabled Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 14/32] tracing/probes: Reject events which have the same name of existing one Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 15/32] PCI: cadence: Use bitfield for *quirk_retrain_flag* instead of bool Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 16/32] PCI: cadence: Add quirk flag to set minimum delay in LTSSM Detect.Quiet state Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 17/32] PCI: j721e: Add PCIe support for J7200 Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 18/32] PCI: j721e: Add PCIe support for AM64 Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 19/32] PCI: Add ACS quirks for Cavium multi-function devices Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 20/32] watchdog: Start watchdog in watchdog_set_last_hw_keepalive only if appropriate Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 21/32] octeontx2-af: Add additional register check to rvu_poll_reg() Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 22/32] Set fc_nlinfo in nh_create_ipv4, nh_create_ipv6 Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 23/32] flow: fix object-size-mismatch warning in flowi{4,6}_to_flowi_common() Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 24/32] net: usb: cdc_mbim: avoid altsetting toggling for Telit LN920 Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 25/32] block, bfq: honor already-setup queue merges Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 26/32] PCI: ibmphp: Fix double unmap of io_mem Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 27/32] loop: reduce the loop_ctl_mutex scope Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 28/32] ethtool: Fix an error code in cxgb2.c Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 29/32] NTB: Fix an error code in ntb_msit_probe() Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 30/32] NTB: perf: Fix an error code in perf_setup_inbuf() Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 31/32] stmmac: dwmac-loongson:Fix missing return value Sasha Levin
2021-09-11 13:11 ` [PATCH AUTOSEL 5.14 32/32] net: phylink: add suspend/resume support Sasha Levin

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