linux-kernel - Re: [PATCH v4 10/11] PCI: rockchip: Don't advertise MSI-X in PCIe capabilities

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Message-ID: <7a599324-dc92-0c6a-2411-5e8fa70d5686@kernel.org>
Date:   Tue, 18 Apr 2023 08:50:05 +0900
From:   Damien Le Moal <dlemoal@...nel.org>
To:     Rick Wertenbroek <rick.wertenbroek@...il.com>,
        alberto.dassatti@...g-vd.ch
Cc:     xxm@...k-chips.com, Shawn Lin <shawn.lin@...k-chips.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Brian Norris <briannorris@...omium.org>,
        Johan Jonker <jbx6244@...il.com>,
        Caleb Connolly <kc@...tmarketos.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Hugh Cole-Baker <sigmaris@...il.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 10/11] PCI: rockchip: Don't advertise MSI-X in PCIe
 capabilities

On 4/17/23 18:26, Rick Wertenbroek wrote:
> The RK3399 PCIe endpoint controller cannot generate MSI-X IRQs.
> This is documented in the RK3399 technical reference manual (TRM)
> section 17.5.9 "Interrupt Support".
> 
> MSI-X capability should therefore not be advertised. Remove the
> MSI-X capability by editing the capability linked-list. The
> previous entry is the MSI capability, therefore get the next
> entry from the MSI-X capability entry and set it as next entry
> for the MSI capability. This in effect removes MSI-X from the list.
> 
> Linked list before : MSI cap -> MSI-X cap -> PCIe Device cap -> ...
> Linked list now : MSI cap -> PCIe Device cap -> ...
> 
> Signed-off-by: Rick Wertenbroek <rick.wertenbroek@...il.com>
> Tested-by: Damien Le Moal <dlemoal@...nel.org>

Looks good, but I think you need to add also:

Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
Cc: stable@...r.kernel.org

Otherwise, feel free to add:

Reviewed-by: Damien Le Moal <dlemoal@...nel.org>