From: "Krzysztof Wilczyński" <kw@linux.com>
To: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Rob Herring <robh+dt@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Marc Zyngier <maz@kernel.org>,
linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Lokesh Vutla <lokeshvutla@ti.com>
Subject: Re: [PATCH 6/6] PCI: keystone: Add workaround for Errata #i2037 (AM65x SR 1.0)
Date: Fri, 26 Mar 2021 08:19:07 +0100 [thread overview]
Message-ID: <YF2K6+R1P3SNUoo5@rocinante> (raw)
In-Reply-To: <20210325090026.8843-7-kishon@ti.com>
Hi Kishon,
A few small nitpicks.
> Errata #i2037 in AM65x/DRA80xM Processors Silicon Revision 1.0
> (SPRZ452D–July 2018–Revised December 2019 [1]) mentions when an
> inbound PCIe TLP spans more than two internal AXI 128-byte bursts,
> the bus may corrupt the packet payload and the corrupt data may
> cause associated applications or the processor to hang.
>
> The workaround for Errata #i2037 is to limit the maximum read
> request size and maximum payload size to 128 Bytes. Add workaround
> for Errata #i2037 here. The errata and workaround is applicable
> only to AM65x SR 1.0 and later versions of the silicon will have
> this fixed.
I think it would be either "128 B" or "128 bytes", there is no need to
capitalise bytes.
[...]
> + /*
> + * Memory transactions fail with PCI controller in AM654 PG1.0
> + * when MRRS is set to more than 128 Bytes. Force the MRRS to
> + * 128 Bytes in all downstream devices.
> + */
Same here, it would be "128 bytes" in the comment above.
[...]
> + if (pcie_get_readrq(dev) > 128) {
> + dev_info(&dev->dev, "limiting MRRS to 128\n");
> + pcie_set_readrq(dev, 128);
> + }
[...]
Might be nice to add unit here, so "128 bytes".
Krzysztof
next prev parent reply other threads:[~2021-03-26 7:19 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 9:00 [PATCH 0/6] PCI: Add legacy interrupt support in Keystone Kishon Vijay Abraham I
2021-03-25 9:00 ` [PATCH 1/6] dt-bindings: PCI: ti,am65: Add PCIe host mode dt-bindings for TI's AM65 SoC Kishon Vijay Abraham I
2021-03-25 16:56 ` [PATCH 1/6] dt-bindings: PCI: ti, am65: " Rob Herring
2021-03-25 23:38 ` [PATCH 1/6] dt-bindings: PCI: ti,am65: " Rob Herring
2021-03-30 9:29 ` Kishon Vijay Abraham I
2021-04-20 13:13 ` Rob Herring
2021-03-25 9:00 ` [PATCH 2/6] dt-bindings: PCI: ti,am65: Add PCIe endpoint " Kishon Vijay Abraham I
2021-03-25 16:56 ` [PATCH 2/6] dt-bindings: PCI: ti, am65: " Rob Herring
2021-03-25 9:00 ` [PATCH 3/6] irqdomain: Export of_phandle_args_to_fwspec() Kishon Vijay Abraham I
2021-03-25 9:00 ` [PATCH 4/6] PCI: keystone: Convert to using hierarchy domain for legacy interrupts Kishon Vijay Abraham I
2021-03-26 6:58 ` Krzysztof Wilczyński
2021-03-25 9:00 ` [PATCH 5/6] PCI: keystone: Add PCI legacy interrupt support for AM654 Kishon Vijay Abraham I
2021-03-26 7:14 ` Krzysztof Wilczyński
2021-04-02 11:11 ` Marc Zyngier
2021-03-25 9:00 ` [PATCH 6/6] PCI: keystone: Add workaround for Errata #i2037 (AM65x SR 1.0) Kishon Vijay Abraham I
2021-03-26 7:19 ` Krzysztof Wilczyński [this message]
2021-05-17 13:15 ` [PATCH 0/6] PCI: Add legacy interrupt support in Keystone Christian Gmeiner
2021-05-17 13:21 ` Kishon Vijay Abraham I
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